Article
Chemistry, Multidisciplinary
Tingting Hu, Weiheng Chen, Yubing Liu, Longxiang Gong, Zhongqing Jiang, Dinesh Bhalothia, Thandavarayan Maiyalagan, Zhong-Jie Jiang
Summary: Plasma treatment and reduction are used to synthesize Pt nanoparticles on nitrogen-doped carbon nanotubes with low Pt content, which results in enhanced catalytic activities for methanol oxidation and oxygen reduction reactions. Plasma treatment introduces surface defects on the nanotubes, facilitating the growth of Pt nanoparticles, while plasma reduction optimizes the surface oxidation states of Pt, decreasing the energy barriers for rate-determining steps. The p-Pt@p-NCNT, when used as anode and cathode catalysts for DMFCs, exhibits higher maximum power density and good durability.
Article
Materials Science, Multidisciplinary
Nurbiye Sawut, Ruxangul Jamal, Tursun Abdiryim, Mariyam Niyaz
Summary: A three-dimensional hybrid support material was fabricated for Pt nanoparticles and applied to methanol oxidation. The resulting catalyst exhibited a large electrochemically active area and high mass active current density for methanol, showing significantly improved electro-catalytic activity compared to commercial Pt/C catalysts.
Article
Chemistry, Multidisciplinary
Christian M. Clausen, Olga A. Krysiak, Lars Banko, Jack K. Pedersen, Wolfgang Schuhmann, Alfred Ludwig, Jan Rossmeisl
Summary: Compositionally complex materials, such as high-entropy alloys and oxides, have the potential to be efficient catalyst platforms due to their vast chemical space. However, determining the composition of active catalyst materials requires understanding the descriptor-activity relationship, which is challenging experimentally. In this study, we show that inferred adsorption energy distributions on complex solid solution surfaces can predict the electrocatalytic performance of oxygen reduction reaction in the Ag-Pd-Pt-Ru system with high accuracy.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Gergo Ballai, Tamas Gyenes, Henrik Haspel, Livia Vasarhelyi, Imre Szenti, Daniel Sebok, Zoltan Konya, Akos Kukovecz
Summary: Direct liquid fuel cells are promising for addressing climate change, especially direct methanol fuel cells (DMFCs) which use safe fuels from sustainable sources. However, DMFCs face competitive disadvantages like high cost of noble metal catalysts, application difficulties, and catalyst poisoning from carbon monoxide.
Article
Chemistry, Multidisciplinary
Jiahui Liang, Heyun Cheng, Bolin Zhao, Qiong Hu, Zihao Xing, Yuwei Zhang, Li Niu
Summary: Fluorescent carbon dots are used to regulate the behavior of PtRu catalysts, resulting in a significant increase in catalytic activity for methanol electrooxidation.
Article
Chemistry, Physical
Byung Chan Yang, Sung Eun Jo, Taeyoung Kim, Geonwoo Park, Dohyun Go, Turgut M. Guer, Jihwan An
Summary: This study systematically investigated the application of Pt-SDC alloy anodes in DM_LT-SOFCs. It was found that the anode with a composition of Pt0.83SDC0.17 exhibited lower activation resistance, better resistance to CO poisoning, and higher thermal stability. These improvements were attributed to the high Pt-SDC interfacial density of reaction sites and the oxygen spill over from SDC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Ting Zhang, Wanzong Wang, Zheng Ma, Lei Bai, Yue Yao, Dongqing Xu
Summary: In this study, a novel nanocomposite, Pt-Ru@MWCNT, with Pt-Ru bimetallic nanoparticles covalently-bonded onto multi-walled carbon nanotubes (MWCNTs) was successfully fabricated using a facile and green synthesis method. The Pt-Ru@MWCNT nanocomposite exhibited significantly enhanced electrocatalytic activity for methanol oxidation reactions (MORs), with an electrochemical active surface area (ECSA) of 110.4 m2·g-1 for Pt, which is 2.67 and 4.0 times higher than those of 20wt% commercial Pt@C and Pt-based nanocomposite prepared by other methods, respectively, due to the improved electron-transfer properties from M-O-C covalent bonds. This work provides a new strategy for the design of highly-efficient electrocatalysts to boost MOR performance.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Chemistry, Physical
Guodong Xu, Yun Lei, Keyu Wu, Rongguan Lv, Jing Li, Xiujuan Sun, Weiwei Cai
Summary: In this study, CeO2 is modified through a plasma-phosphating combing strategy and invited as Frustrated Lewis Pair to assist the catalytic MOR process on Pt sites. This strategy also leads to negatively charged sites on CeO2 surface as a host for Pt anchoring, facilitating the even dispersion of Pt nanocrystals. Moreover, this strategy affects the Ce3+/Ce4+ ratio and vacancy oxygen ratio on CeO2 surface, which are critical for OH generation and anti-CO.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Junjun Li, Man Hou, Zhicheng Zhang
Summary: Coating a second metal on the surface of ultrathin 2D nanosheets can modify their electronic structure and surface reactivity. We investigated the effects of different crystal phases of Ru on the electrocatalytic performance of Ru@Pt core-shell nanosheets for the methanol oxidation reaction. It was found that Ru with a face-centered-cubic phase had a greater influence on the electronic structure of Pt than Ru with a hexagonal close-packed phase, leading to improved electrocatalytic activity.
Article
Chemistry, Physical
Xudong Du, Yun Lang, Kun Cao, Jiaqiang Yang, Jiaming Cai, Bin Shan, Rong Chen
Summary: This paper designs bifunctional Pt/Ru nanoparticle catalysts via selective atomic layer deposition for PROX in H-2, showcasing optimal activity and selectivity. The enhancement in PROX performance is attributed to the elimination of competitive CO adsorption on Pt, allowing neighboring exposed Ru surfaces to provide highly active sites for O-2 dissociation.
JOURNAL OF CATALYSIS
(2021)
Article
Chemistry, Physical
Bohua Wu, Haiting Wang, Changqing Wu, Fengxiao Du, Jia Chu, Xiaoqin Wang, Shanxin Xiong
Summary: In this study, Ru-doped Ta2O5 was synthesized as a support for Pt nanoparticles, resulting in Pt/Ru-Ta2O5 catalysts with enhanced electrocatalytic performance for methanol oxidation. The improved dispersion of Pt nanoparticles, increased conductivity of Ta2O5, and promotion of oxidation reactivity by Ru were found to contribute to the excellent electrocatalytic activity. This work demonstrates the promising potential of Ru-Ta2O5 as an anode catalyst support for direct methanol fuel cells.
Article
Chemistry, Physical
Wenjie Wang, Zhongqing Jiang, Xiaoning Tian, T. Maiyalagan, Zhong-Jie Jiang
Summary: Ultra-low amount Pt is uniformly deposited on CoFe nanoparticles embedded nitrogen-doped carbon nanotubes grown directionally on carbon fiber cloth surface using DC-PMS technique. The designed electrode exhibits excellent trifunctional catalytic activities for ORR, HER, and MOR, and shows better catalytic performance and stability than commercial Pt/C catalysts.
Article
Chemistry, Physical
Xiaoling Zhang, Jing Ma, Ruiwen Yan, Wangxin Cheng, Jun Zheng, Baokang Jin
Summary: The study successfully prepared Pt-Ru/polyaniline/carbon nanotubes composites with excellent performance, showing higher activity and stability compared to Pt/C and other catalysts.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Physical
Hao Tian, Yanhui Yu, Qian Wang, Jing Li, Peng Rao, Ruisong Li, Yanlian Du, Chunman Jia, Junming Luo, Peilin Deng, Yijun Shen, Xinlong Tian
Summary: Direct methanol fuel cells (DMFCs) have attracted attention for their high energy density, but the slow kinetics of methanol oxidation reaction affects commercialization. Pt based catalysts are effective but expensive, while 2D Pt based nanostructures are considered promising for MOR.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Agus R. Poerwoprajitno, Lucy Gloag, John Watt, Soshan Cheong, Xin Tan, Han Lei, Hassan A. Tahini, Aaron Henson, Bijil Subhash, Nicholas M. Bedford, Benjamin K. Miller, Peter B. O'Mara, Tania M. Benedetti, Dale L. Huber, Wenhua Zhang, Sean C. Smith, J. Justin Gooding, Wolfgang Schuhmann, Richard D. Tilley
Summary: Single Pt atom catalysts with high exposure are key targets to enhance electrocatalytic activity, and PtRu alloy nanoparticles are the most active catalysts for the methanol oxidation reaction. This study demonstrates a process to create single-Pt-atom-on-Ru catalysts by growing and spreading Pt islands on Ru branched nanoparticles. The formation of a stable single atom structure is driven by the formation of strong Pt-Ru bonds and the lowering of the surface energy of the Pt islands, resulting in a high current density and mass activity for the methanol oxidation reaction over time.
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)