Article
Chemistry, Physical
Weiyue Zhao, Bin Chi, Lecheng Liang, Pengfei Yang, Wei Zhang, Xin Ge, Liming Wang, Zhiming Cui, Shijun Liao
Summary: This study demonstrates the development of a highly active and durable Pt-based ternary catalyst for improving the sluggish oxygen reduction reaction in fuel cells. The catalyst shows faster reaction kinetics and minimal activity loss compared to commercial catalysts, and its superior performance has been verified in practical applications.
Article
Chemistry, Physical
Menggang Li, Fenyang Tian, Tianshu Lin, Lu Tao, Xin Guo, Yuguang Chao, Ziqi Guo, Qinghua Zhang, Lin Gu, Weiwei Yang, Yongsheng Yu, Shaojun Guo
Summary: This study presents PdPtCu ultrathin nanorings with abundant high-index facets, breaking the activity ceiling of conventional catalysts and achieving an ultrahigh electrochemical active surface area. The optimized Pd39Pt33Cu28/C catalyst shows enhanced ORR activity and superior durability, with exciting prospects for high-performance ORR catalysts in fuel cells.
Article
Chemistry, Multidisciplinary
Zhaojun Yang, Hongzhou Yang, Lu Shang, Tierui Zhang
Summary: This study reports the preparation of ordered PtFeIr intermetallic nanowire catalysts with superior mass activity for ORR. The use of a silica-protected strategy prevents structural destruction, maintaining the advantages of the ordered structure even after stability tests.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Environmental
Rashid Iqbal, Sajjad Ali, Ghulam Yasin, Shumaila Ibraheem, Mohammad Tabish, Mathar Hamza, Henan Chen, Hu Xu, Jie Zeng, Wei Zhao
Summary: A new two-dimensional metal-organic framework, Co-3(HADQ)(2), with high conductivity and exceptional catalytic activity and stability in acidic conditions was synthesized for the first time. Density functional theory calculations suggested that Co-sites are the active sites, making this material a promising model catalyst for mechanistic studies of acidic ORR.
CHEMICAL ENGINEERING JOURNAL
(2022)
Review
Chemistry, Physical
Zhengrong Li, Tao Shen, Yezhou Hu, Ke Chen, Yun Lu, Deli Wang
Summary: Ordered intermetallic nanoparticles exhibit excellent stability and catalytic activity in both acidic and alkaline electrolytes due to their highly ordered atomic arrangements and strong Pt-M orbital interactions. Palladium (Pd), with similar electronic structure and lattice parameters to Pt, has also attracted significant attention and several Pd-based ordered intermetallics have been synthesized, showing sufficient catalytic performance.
ACTA PHYSICO-CHIMICA SINICA
(2021)
Article
Chemistry, Physical
Yang Gao, Xiaohui Xu, Yue Niu, Xinran Hu, Zeyu Li, Longkun Yang, Linjie Zhi, Bin Wang
Summary: A series of viologen-based heterogeneous catalysts with the same molecular skeleton but different substituent groups were synthesized and used as model catalysts to investigate the structure-function relationship for small molecules-based H2O2 electrosynthesis. Viologens can produce H2O2 in a synergistic manner, acting as both oxygen reduction catalysts and redox mediators. Among the samples, a benzyl-substituted viologen (BV) showed the best electrocatalytic performance, with the highest H2O2 selectivity of 96.9% at 0.6 V and the largest ring current density of about 13.6 mA center dot mmol(-1). Density functional theory (DFT) calculations revealed that the carbon atoms bonded with positively charged N are the active sites, and the small HOMO-LUMO energy gap of BV promotes the synergistic mechanism for H2O2 production.
Article
Chemistry, Inorganic & Nuclear
Wei-Jie Zeng, Chang Wang, Peng Yin, Lei Tong, Qiang-Qiang Yan, Ming-Xi Chen, Shi-Long Xu, Hai-Wei Liang
Summary: By using high-temperature X-ray diffraction and energy-dispersive spectroscopic elemental mapping techniques, we studied the formation process of IMCs, particularly PtCo, in an industrial impregnation synthesis. We found that high-temperature annealing is crucial for promoting the formation of alloy particles with a stoichiometric Co/Pt ratio, leading to the transformation of disordered alloys into ordered intermetallic structures at low temperatures. Based on these findings, we successfully synthesized highly ordered L1(0)-type PtCo catalysts with remarkable ORR performance in fuel cells.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Siyuan Zhu, Liting Yang, Jingsen Bai, Yuyi Chu, Jie Liu, Zhao Jin, Changpeng Liu, Junjie Ge, Wei Xing
Summary: This study reports the synthesis of a Pt5La intermetallic compound, which exhibits enhanced activity and excellent stability. The catalyst shows high half wave potential and mass activity, and performs superior stability during accelerated stressed test.
Article
Chemistry, Inorganic & Nuclear
Wei-Jie Zeng, Chang Wang, Peng Yin, Lei Tong, Qiang-Qiang Yan, Ming-Xi Chen, Shi-Long Xu, Hai-Wei Liang
Summary: We use high-temperature X-ray diffraction and energy-dispersive spectroscopic elemental mapping techniques to study the formation process of intermetallic compounds (IMCs) in PtCo catalysts. The results show that high-temperature annealing is crucial for promoting the formation of alloy particles with a stoichiometric Co/Pt ratio, which leads to the transformation of disordered alloys to ordered intermetallic structures at a relatively low temperature. Based on these findings, highly ordered L1(0)-type PtCo catalysts with outstanding oxygen reduction reaction (ORR) performance in fuel cells are successfully synthesized.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Siyuan Zhu, Liting Yang, Jingsen Bai, Yuyi Chu, Jie Liu, Zhao Jin, Changpeng Liu, Junjie Ge, Wei Xing
Summary: Designing feasible electrocatalysts for oxygen reduction reaction (ORR) requires advancement in both activity and stability. Alloying platinum with early transition metals, such as Pt La alloy, has been shown to be an efficient strategy. In this study, a Pt5La intermetallic compound was synthesized using a novel and facile strategy. The resulting Pt5La alloy catalyst exhibits enhanced activity and superior stability, providing new opportunities for future applications of Pt-rare earth metal alloy with excellent electrocatalytic properties.
Article
Engineering, Environmental
Jianxue Liu, Chao Zhang, Shaoqian Yuan, Wenwen Yang, Yuan Cao, Jiayao Deng, Binbin Xu, Huimin Lu
Summary: Transition metal phosphides (TMPs) have gained attention as robust and efficient catalyst materials due to their unique electronic properties and stabilities. CoP@N,P-CNFs, fabricated through thermal treatment of electrospun ZIF-67 spheres, show excellent electrocatalytic activity and performance in Al-air batteries, indicating potential broad applications in energy storage and conversions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Multidisciplinary Sciences
Wei-Jie Zeng, Chang Wang, Qiang-Qiang Yan, Peng Yin, Lei Tong, Hai-Wei Liang
Summary: In this study, the authors use in-situ high-temperature X-ray diffraction studies to investigate the structural evolution in the synthesis of carbon-supported intermetallic catalysts. They identify a phase-transition-temperature-dependent evolution process and propose a separate alloying/ordering annealing synthetic protocol for the synthesis of highly ordered intermetallic catalysts.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Qinan Song, Shuo Zhang, Xiaoshu Hou, Jiacheng Li, Lei Yang, Xiang Liu, Miao Li
Summary: This study proposes a strategy for efficient nitrate removal through the activation of oxygen vacancies on a highly dispersed Cu-doped TiO(2 )nanotube array (Cu/ TNTA) cathode via electrodeposition. The results show that trace Cu doping promotes efficient charge transfer between nitrate and the electrode, leading to enhanced nitrate removal rate and stability.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yitao Song, Yewang Peng, Shuang Yao, Peng Zhang, Yujie Wang, Jianmin Gu, Tongbu Lu, Zhiming Zhang
Summary: A simple and effective method for constructing highly efficient oxygen reduction catalysts with trace amount of isolated cobalt was developed by pyrolysis of Co-centered polyoxometalate@metal-organic framework (Co-POM@MOF). The resulting Co-W-NC composite catalysts exhibit excellent durability and high performance for oxygen reduction reactions.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Kun Luo, Ya Li, Tong Liu, Xiangqun Zhuge, Etelka Chung, Andrew R. Timms, Simon P. Graham, Guogang Ren
Summary: Copper nanoparticles and gold nanoclusters have high catalytic performance in generating hydrogen peroxide, which can be used to kill disease-causing microbes and carry carbon-free energy. By decorating the surface of copper nanoparticles with gold nanoclusters using galvanic displacement, a novel method was demonstrated to selectively produce hydrogen peroxide. The optimized copper-gold bimetallic nanoparticles exhibited excellent catalytic activity and durability.
Article
Chemistry, Physical
Mosaddek Hossen, Shamim Hasan, Riajul Islam Sardar, Jahi bin Haider, Kaido Mottakin, Kaido Tammeveski, Plamen Atanassov
Summary: Non-platinum catalysts are essential for the economical application of AEMFC, and this review summarizes the advancements in the synthesis of different components and structures of catalysts. Thirteen catalysts have surpassed the peak power density threshold of 1000 mW.cm-2, including Metal-Nitrogen-Carbon (M-N-C), Bimetals-Nitrogen-Carbon (MM-N-C), Transition metal oxides (TMO), and non-metallic catalysts (NMC). The improvement in catalyst's porosity, surface area, conjugation of active sites, and synthesis procedures greatly affect the ORR activity and fuel cell performance.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Electrochemistry
Jaana Lilloja, Marek Mooste, Elo Kibena-Poldsepp, Ave Sarapuu, Arvo Kikas, Vambola Kisand, Maike Kaarik, Jekaterina Kozlova, Alexey Treshchalov, Paarn Paiste, Jaan Aruvali, Jaan Leis, Aile Tamm, Steven Holdcroft, Kaido Tammeveski
Summary: Cobalt-, iron- and nitrogen-doped ordered mesoporous carbon (OMC)-based electrocatalysts are prepared and characterized as cathode catalysts for anion-exchange membrane fuel cell (AEMFC). The doped catalysts show high electrocatalytic activity and stability, with CoFe-N-OMC/CNT achieving the highest peak power density of 336 mW cm-2 in AEMFC testing.
ELECTROCHIMICA ACTA
(2023)
Article
Chemistry, Physical
Jonas Mart Linge, Heiki Erikson, Marek Mooste, Helle-Mai Piirsoo, Tiit Kaljuvee, Arvo Kikas, Jaan Aruvali, Vambola Kisand, Aile Tamm, Arunachala M. Kannan, Kaido Tammeveski
Summary: Two different wet chemical methods were used to deposit silver nanocatalyst (40 wt%) on commercial mesoporous carbon support material (Ag/C) to enhance the electrochemically active surface area. The catalyst materials were characterized using various analytical techniques and evaluated for oxygen reduction reaction (ORR) in alkaline media. The Ag/C catalyst exhibited higher mass activity for ORR compared to Vulcan carbon, showing potential for application in anion exchange membrane fuel cells.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Analytical
Leticia S. Bezerra, Marek Mooste, Guilherme V. Fortunato, Eduardo S. F. Cardoso, Marcos R. V. Lanza, Kaido Tammeveski, Gilberto Maia
Summary: A highly durable bifunctional catalyst for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the air electrode of zinc-air batteries (ZAB) was proposed, which consisted of NiCo2O4 blended with nitrogen-doped graphene nanoribbons (GNRN). The catalysts with different ratios of NiCo2O4 and GNRN were evaluated for their activity and electrochemical stability. The results showed that the NiCo2O4(80):GNRN(20) and NiCo2O4(90):GNRN(10) catalysts exhibited high efficiency for both ORR and OER. The NiCo2O4/GNRN-based ZABs showed comparable power densities and specific capacities to the commercial Pt-Ru/C catalyst.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Physical
Yogesh Kumar, Marek Mooste, Kaido Tammeveski
Summary: Rechargeable zinc-air battery (RZAB) is a promising energy-storage device for renewable energy economy, but practical application is limited by various challenges, mainly the sluggish reaction kinetics of ORR and OER. Non-precious metal catalysts have shown great potential for oxygen-involved electrocatalysis compared to noble metal-based catalyst materials. This article reviews the recent advancements in transition metal-based bifunctional electrocatalysts and outlines the conclusion and future perspectives for RZAB application.
CURRENT OPINION IN ELECTROCHEMISTRY
(2023)
Article
Chemistry, Physical
Madis Luesi, Heiki Erikson, Helle -Mai Piirsoo, Jaan Aruvali, Arvo Kikas, Vambola Kisand, Aile Tamm, Kaido Tammeveski
Summary: Galvanic exchange was used to prepare AgPd nanocatalysts. The particle sizes were determined to be 10-20 nm, and the AgPd particles obtained using MP-AES had a larger Ag/Pd ratio compared to those obtained using other ratios. The galvanic exchange process resulted in porous and halfmoon shaped particles. Increasing Pd content led to lower mass activities for oxygen reduction reaction (ORR) despite higher specific activity values on larger particles. A Tafel slope value of -60 mV was observed for all the AgPd catalysts.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Audris Mihailovs, Markus Otsus, Arvo Kikas, Vambola Kisand, Aile Tamm, Heiki Erikson, Kaido Tammeveski
Summary: Palladium coatings are deposited onto bulk silver, nickel, and copper electrodes using galvanic exchange to investigate the oxygen reduction reaction (ORR) on these bimetallic electrodes. The electrodes prepared by galvanic replacement for 30 min in the Pd precursor bath are analyzed using X-ray photoelectron spectroscopy, and the surface morphology of all Pd coatings prepared onto Ag substrates is examined using scanning electron microscopy. Electrochemical tests reveal that the specific activity of Pd on Ag for ORR in alkaline media increases with deposition time, while the specific activity of palladium on nickel reaches a plateau after 30 min of galvanic replacement.
Article
Chemistry, Physical
Jonas Mart Linge, Heiki Erikson, Peeter Ritslaid, Arvo Kikas, Vambola Kisand, Jaan Aruvali, Jekaterina Kozlova, Aile Tamm, Ave Sarapuu, Kaido Tammeveski
Summary: In this study, MnO2 and multiwalled carbon nanotube (MWCNT) composites decorated with silver were prepared to evaluate their electrocatalytic activity towards the oxygen reduction reaction (ORR). The physicochemical characterisation was done using scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The electrochemical studies revealed that the activity and stability of the composite catalysts depend on the substrate material and the thickness of the silver layer.
Article
Chemistry, Physical
Jaana Lilloja, Elo Kibena-Poldsepp, Ave Sarapuu, Anastasiia Konovalova, Maike Kaarik, Jekaterina Kozlova, Paarn Paiste, Arvo Kikas, Alexey Treshchalov, Jaan Aruvali, Andrea Zitolo, Jaan Leis, Aile Tamm, Vambola Kisand, Steven Holdcroft, Kaido Tammeveski
Summary: Transition-metal and nitrogen-doped graphene-like material and carbon nanotube composites are synthesized and utilized as cathode catalysts in anion exchange membrane fuel cells. The materials exhibit similar physicochemical properties and electrocatalytic performances with different yields of HO2- formation. The M-N-Gra/CNT catalysts, especially CoFe-N-Gra/CNT, combined with Aemion+ reinforced anion-exchange membrane, show excellent AEMFC performance comparable to that of Pt/C with a peak power density of 638 mW cm(-2), attributed to the presence of M-Nx sites, carbon-encapsulated transition-metal nanoparticles, and nitrogen-containing moieties.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Aniket Raut, Haoyan Fang, Yu-Chung Lin, Shi Fu, David Sprouster, Ryuichi Shimogawa, Anatoly I. Frenkel, Chulsung Bae, John C. Douglin, Jaana Lillojad, Kaido Tammeveski, Zhiqiao Zeng, Stoyan Bliznakov, Miriam Rafailovich, Dario R. Dekel
Summary: By using the complementary techniques of X-ray micro-computed tomography (CT), Scanning Electron Microscopy (SEM), and Energy Dispersive X-ray (EDX) spectroscopy, we have discovered that Pt ion migration is a key factor in explaining the performance decay of AEMFCs. Pt+2 ions are easily formed in alkaline media and can either dissolve into the carbon support or migrate to the membrane. Unlike PEMFCs, where hydrogen cross over results in the formation of a vertical Pt line within the membrane, the ions in AEM are trapped by charged groups within the membrane, causing membrane disintegration and failure. However, when substituting the Pt/C of the cathode with a FeCo-N-C catalyst, metal ion diffusion is still observed but with the ions migrating to the anode, thereby increasing membrane stability.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Physical
Ave Sarapuu, Jaana Lilloja, Srinu Akula, Jose H. Zagal, Stefania Specchia, Kaido Tammeveski
Summary: Fuel cells are a promising clean energy technology with potential in various sectors. The high cost and scarcity of noble metals used in fuel cell catalysts have hindered their commercialization. Non-precious metal electrocatalysts, particularly single-atom catalysts (SACs) with atomically dispersed active sites, have gained attention for their potential as alternatives. This review summarizes recent advancements in the utilization of transition metal-based SACs in fuel cells and highlights strategies to enhance their performance and durability. SACs show promise as cathode electrocatalysts in low-temperature fuel cells.
Article
Chemistry, Physical
Yogesh Kumar, Srinu Akula, Elo Kibena-Poldsepp, Maike Kaarik, Jekaterina Kozlova, Arvo Kikas, Jaan Aruvali, Vambola Kisand, Jaan Leis, Aile Tamm, Kaido Tammeveski
Summary: In this study, a cobalt- and nitrogen-doped porous carbon catalyst was prepared from phloroglucinol-formaldehyde polymer networks with 2-methyl imidazole and cobalt phthalocyanine. The catalyst showed commendable electrocatalytic activity for both ORR and OER and exhibited outstanding performance and stability in zinc-air batteries.
Article
Chemistry, Physical
Kaur Muuli, Rohit Kumar, Marek Mooste, Viktoria Gudkova, Alexey Treshchalov, Helle-Mai Piirsoo, Arvo Kikas, Jaan Aruvaeli, Vambola Kisand, Aile Tamm, Andres Krumme, Prabu Moni, Michaela Wilhelm, Kaido Tammeveski
Summary: The goal of achieving large-scale production of zero-emission vehicles by 2035 is expected to create high demand for electric vehicle (EV) development and availability. However, a major challenge is the limited availability of suitable batteries and battery materials. This study presents an alternative catalyst material, FeCoNi-CNF, made from iron, cobalt, and nickel phthalocyanine tri-doped electrospun carbon nanofibers, which shows promise for use in rechargeable zinc-air batteries (RZAB) due to its affordability and performance. FeCoNi-CNF demonstrated comparable performance to Pt-group metal (PGM)-based catalysts in terms of oxygen reduction and evolution reactions, and it exhibited superior operational durability and longer lifespan in RZAB charge-discharge cycling.
Article
Electrochemistry
Kaur Muuli, Marek Mooste, Srinu Akula, Viktoria Gudkova, Markus Otsus, Arvo Kikas, Jaan Aruvali, Alexey Treshchalov, Vambola Kisand, Aile Tamm, Andres Krumme, Sara Cavaliere, Kaido Tammeveski
Summary: A Pt-free cathode catalyst embedded with cobalt(II) phthalocyanine and iron(II) phthalocyanine compounds was prepared, which showed better electrocatalytic oxygen reduction reaction (ORR) activity. The catalyst exhibited a nanofibrous structure with rough surface texture and contained significant amounts of N, Fe, and Co. The D-MN4-CNF-IL-A catalyst, prepared using ionic liquid as a porogen, displayed the best electrocatalytic activity for O2 electroreduction in 0.5 M H2SO4 electrolyte solution, with an ORR onset potential of 0.83 V and a half-wave potential of 0.71 V vs reversible hydrogen electrode (RHE).
Article
Electrochemistry
Abdul Qayoom Mugheri, Shaista Khan, Ali Asghar Sangah, Aijaz Ahmed Bhutto, Muhammad Younis Laghari, Nadeem Ahmed Mugheri, Asif Ali Jamali, Arsalan Ahmed Mugheri, Nagji Sodho, Abdul Waheed Mastoi, Aftab Kandhro
Summary: Green hydrogen has the potential to transition to a pollution-free energy infrastructure. This study proposes a solution to produce hydrogen during the photoelectrochemical process, offering greater stability and control over chemical reactions. Techno-economic assessments show the efficiency and economic feasibility of co-producing value-added chemicals to enhance green hydrogen production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Danpeng Cheng, Wuxin Sha, Qigao Han, Shun Tang, Jun Zhong, Jinqiao Du, Jie Tian, Yuan-Cheng Cao
Summary: LiNixCoyMn1-x-yO2 (NCM) is a critical cathode material for lithium-ion batteries in electric vehicles. The aging of cathode/electrolyte interfaces leads to capacity degradation and long-term cycle instability. A novel neural network model called ACGNet is developed to predict electrochemical stability windows of crystals, allowing for high-throughput screening of coating materials. LiPO3 is identified as a promising coating material with high oxidation voltage and low cost, which significantly improves the cycle stability of NCM batteries. This study demonstrates the accuracy and potential of machine learning in battery materials.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
P. Mohana, R. Yuvakkumar, G. Ravi, S. Arunmetha
Summary: This study successfully fabricates a non-noble CuO/NiO/rGO nanocomposite and investigates its electrocatalytic performance for oxygen evolution reaction in alkaline environment. The experimental results demonstrate that the electrocatalyst exhibits high activity and good stability, offering a new synthetic approach for sustainable energy production.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Qiong Qu, Jing Guo, Hongyu Wang, Kai Zhang, Jingde Li
Summary: In this study, a bifunctional electrode host design consisting of carbon nanofibers implanted ordered porous Co-decorated Al2O3 supported on carbon nanotube film (CNTF) was proposed to address the shuttling effect of lithium polysulfides (LiPSs) and dendrite formation of metal lithium anode in lithium-sulfur (Li-S) batteries. The electrode exhibited excellent conductivity, efficient confinement of LiPSs, and catalytic conversion performance, resulting in high initial capacity and good capacity retention during cycling. As an anode, the electrode showed excellent Li+ diffusion performance and uniform lithium growth behavior, achieving a dendrite-free lithium electrode. The flexible pack cell assembled from these electrodes delivered a specific capacity of 972 mAh g(-1) with good capacity retention.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Hong Zhang, Jin-Peng Yu, Chen Chen, Cheng-Yong Shu, Guang-Yu Xu, Jie Ren, Kai Cui, Wen-Fang Cai, Yun-Hai Wang, Kun Guo
Summary: Spray coating of acetylene black nanoparticles onto stainless steel mesh can enhance its biofilm formation ability and current density, making it a promising electrode material for microbial electrochemical systems. The spray coating method is simple, cost-effective, and suitable for large-size stainless steel electrodes.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Binpeng Hou, Jingjin Chen, Li-Hong Zhang, Xiaowen Shi, Zizhong Zhu
Summary: The electrochemical performance of Li1.20Mn0.44Ni0.32Co0.04O2 and its oxygen-deficient phase Li1.20Mn0.44Ni0.32Co0.04O1.83 was studied through first-principles calculations. The results show that the oxygen-deficient phase has a higher theoretical capacity but lower voltage platform and higher chemical activity compared to the pristine phase.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Yating Du, Sayoko Shironita, Daisuke Asakura, Eiji Hosono, Yoshitsugu Sone, Yugo Miseki, Eiichi Kobayashi, Minoru Umeda
Summary: This study investigates the effect of high- and low-temperature environments on the charge-discharge performance of a Li-ion battery. The deterioration mechanisms of the battery at different temperatures are analyzed through various characterization techniques. The results indicate that the battery performance deteriorates more significantly at a low-temperature environment of 5 degrees C compared to higher temperatures. The understanding of the deterioration mechanisms can contribute to the development of safer battery usage methods.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Si-Si Shi, Zhi-Xiang Yuan, Fei Zhang, Ping Chen
Summary: In this study, a new nano-electrocatalyst was prepared, which exhibited superior electrocatalytic activity for the reduction of NO2- to ammonia in a neutral electrolyte, potentially due to the synergistic enhancement between Co3O4-x and Co.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Berna Dalkiran, Havva Bekirog
Summary: This study reports the use of deep eutectic solvents (DES) based on ethylene glycol and urea as low-cost and green electrolytes for enhancing electrochemical detection of natural antioxidants. The study successfully developed a disposable and effective electrochemical sensing platform for simultaneous determination of ascorbic acid (AA) and gallic acid (GA) using NaOH nanorods on a pencil graphite electrode. The proposed electrode showed improved analytical performance, with higher peak currents and shifted oxidation potentials in DES compared to BR buffer medium.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Sijun Ren, Jianguo Huang
Summary: In this study, a novel bio-inspired nanofibrous WO3/carbon composite was synthesized using a facile hydrothermal method. The three-dimensional network structure of the composite alleviated the volume expansion of WO3 nanorods and enhanced the charge-transport kinetics. The optimized composite exhibited superior lithium storage properties.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Zhilong Zheng, Yu Chen, Hongxia Yin, Hengbo Xiao, Xiangji Zhou, Zhiwen Li, Ximin Li, Jin Chen, Songliu Yuan, Junjie Guo, Haibin Yu, Zhen Zhang, Lihua Qian
Summary: This study found that interstitial Zn cations in CoMoO4 can modulate the dissolution kinetics of Mo cations and improve the OER performance. The interstitial Zn cations can prevent the dissolution of Co cations at high potential, enhancing the durability of the catalyst.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Xiaobo Lin, Shern R. Tee, Debra J. Searles, Peter T. Cummings
Summary: Molecular dynamics simulations using the constant potential method were used to investigate the charging dynamics and charge storage of supercapacitors. The simulations revealed that the water-in-salt electrolyte exhibited the highest charge storage and significantly higher capacitance on the negative electrode. The varying contributions of different electrode regions to supercapacitor performance were also demonstrated.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Wiktoria Lipinska, Vita Saska, Katarzyna Siuzdak, Jakub Karczewski, Karol Zaleski, Emerson Coy, Anne de Poulpiquet, Ievgen Mazurenko, Elisabeth Lojou
Summary: The spatial distribution of enzymes on electrodes is important for bioelectrocatalysis. In this study, controlled spatial distribution of gold nanoparticles on Ti nanodimples was achieved. The efficiency of enzymatic O2 reduction was found to be influenced by the size of the gold nanoparticles and their colocalization with TiO2. The highest stability of enzymatic current was observed with the largest gold nanoparticles.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Tariq M. Al-Hejri, Zeenat A. Shaikh, Ahmed H. Al-Naggar, Siddheshwar D. Raut, Tabassum Siddiqui, Hamdan M. Danamah, Vijaykumar V. Jadhav, Abdullah M. Al-Enizi, Rajaram S. Mane
Summary: This study explores a promising self-growth approach for the synthesis of nickel hydroxide (Ni(OH)2) nanosponge-balls on the surface of a nickel-foam (NiF) electrode. The modified NiF electrode, named Ni(OH)2@NiF, shows distinctive nanosponge-ball morphology and demonstrates excellent energy storage capability and electrocatalytic performance in both hydrogen and oxygen evolution reactions.
ELECTROCHIMICA ACTA
(2024)
Article
Electrochemistry
Rafael Del Olmo, Gregorio Guzman-Gonzalez, Oihane Sanz, Maria Forsyth, Nerea Casado
Summary: The use of Lithium-Ion Batteries (LIBs) is becoming increasingly extensive, and it is important to optimize the devices to achieve their maximum practical specific capacity. In this study, mixed ionic-electronic conducting (MIEC) binders based on PEDOT:PSS and PEDOT: PDADMA-TFSI were developed for Li-ion cathodes, and their performance was compared with conventional formulations. The influence of electrode formulations, including the addition of conducting carbon and an Organic Ionic Plastic Cristal (OIPC), was also analyzed. The proposed binders showed improved performance compared to conventional formulations with different electrolyte types and active materials.
ELECTROCHIMICA ACTA
(2024)
