Article
Chemistry, Multidisciplinary
Liuxuan Luo, Cehuang Fu, Yangge Guo, Xiyang Cai, Xiashuang Luo, Zehao Tan, Rui Xue, Xiaojing Cheng, Shuiyun Shen, Junliang Zhang
Summary: Rationally combining designed supports and metal-based nanomaterials is effective to synergize their respective physicochemical and electrochemical properties for developing highly active and stable/durable electrocatalysts. In this work, sub-5 nm monodispersed nanodots with a special nanostructure are synthesized and anchored onto 3D porous N-doped graphene nanosheets. The resulting electrocatalysts exhibit exceptional activity and stability, outperforming commercial Pd/C and Pt/C. Advanced experimental and theoretical analyses reveal the synthetic mechanism and origins of the enhanced performance, providing a design paradigm for high-performance electrocatalysts.
Article
Materials Science, Multidisciplinary
YueHua Wang, Jing Su, Guohao Zhu, Liang Dong, Jianbing Zang
Summary: As an environmentally friendly and efficient new energy technology, direct alcohol fuel cells (DMFC) are on the verge of wide commercialization. However, the catalysis of the oxygen reduction reaction (ORR) at the cathode requires expensive and unstable Pt/C. This paper successfully synthesized nanodiamond/Fe3C core covered by Fe and N co-doped graphene-shell (ND/Fe3C@Fe-N-C) which showed catalytic activity comparable to Pt/C but with better stability.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Eugenia Tanasa, Florentina Iuliana Maxim, Tugce Erniyazov, Matei-Tom Iacob, Tomas Skala, Liviu Cristian Tanase, Catalin Ianasi, Cristina Moisescu, Cristina Miron, Ioan Ardelean, Vlad-Andrei Antohe, Eugenia Fagadar-Cosma, Serban N. Stamatin
Summary: Nitrogen-doped carbons play a crucial role in the oxygen reduction reaction, but the presence of oxygen is also essential for achieving high onset potentials. The study revealed that the oxygen surrounding the pyridinic nitrogen was critical in influencing the onset potentials. While there was no clear correlation between sample structure and electrochemical activity, nitrogen chemistry remains a significant factor.
Article
Physics, Applied
Marie-Luise Braatz, Nils-Eike Weber, Barthi Singh, Klaus Muellen, Xinliang Feng, Mathias Klaeui, Martin Gradhand
Summary: In this study, the structural and electronic properties of co-doped graphene were analyzed using Raman spectroscopy, magneto-transport, and Hall measurements. The results demonstrate the challenges in understanding the microscopic properties of graphene beyond simple preparation methods, as the introduction of dopants can have complex effects. Additionally, the inhomogeneities across individual graphene sheets pose challenges in interpreting measurements.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Zhiyuan Guo, Shaoming Liu, Xiao Hu, Jie Song, Ke Xu, Qing Ye, Guizhi Xu, Zhanfeng Deng
Summary: Homogeneous dispersion of active sites and abundant pore structure are favorable for the oxygen reduction reaction activity of non-precious metal electrocatalysts. The nitrogen-doped carbon core supported CoFe alloy-nitrogen co-doped carbon shell nanopolyhedron electrocatalyst prepared through a facile thermal conversion exhibited excellent catalytic activity and electrochemical stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Environmental
Songliang Liu, Shuli Yin, Hugang Zhang, Shiqian Jiao, Ziqiang Wang, You Xu, Xiaonian Li, Liang Wang, Hongjing Wang
Summary: The study introduces a facile method to synthesize Au@PdPt porous nanowire architecture which shows superior catalytic performance for electrocatalytic oxygen reduction reaction. This synthetic strategy can be widely used for preparing porous core-shell structured metallic nanowires for various electrocatalytic applications.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
R. Benavides, C. Gallardo, S. Fernandez, E. De-Casas, D. Morales-Acosta
Summary: N-doped reduced graphene oxide materials with varying nitrogen concentrations were successfully synthesized and evaluated for oxygen reduction reaction catalytic activity, demonstrating enhanced performance in alkaline media. The study confirmed the importance of different nitrogen species, particularly amine-like N, in enhancing the ORR catalytic activity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Hesheng Yu, Dawei Liu, Katam Srinivas, Fei Ma, Ziheng Zhang, Mengya Wang, Yu Wu, Yue Wang, Xinsheng Li, Yuanfu Chen
Summary: In this study, a Fe/Fe3C@NC catalyst with unconventional core-shell nanostructure was developed via facile pyrolysis. The catalyst exhibited superior performance in oxygen reduction reaction (ORR), surpassing the benchmark Pt/C catalyst in terms of half-wave potential and Tafel slope, while maintaining excellent durability and methanol tolerance. The distinct morphological structure, including the heterostructure, core-shell nanostructure, high-content pyridinic-N doping, and abundant mesopores, contributed to the enhanced ORR activities. This study presents a strategy for designing and fabricating non-noble catalysts with well-designed nanoarchitecture and high catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Shuqi Hu, Yuying Liu, Shuangbao Wang, Xinyi Zhang, Pei Kang Shen
Summary: The study demonstrates that ultrathin Co(OH)(2) nanoparticles can be converted into Co3O4-Pt core-shell nanoparticles with high Pt utilization through thermal annealing and controlled replacement reaction on 3D graphene. This nanostructure shows optimized mass activity and specific activity, significantly outperforming traditional Pt/C catalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Keke Li, Yating Zhang, Peng Wang, Xueying Long, Lisi Zheng, Guoyang Liu, Xinfu He, Jieshan Qiu
Summary: Fuel cells are a promising candidate for next-generation energy conversion devices, but the development of advanced non-precious oxygen reduction catalysts with high activity and stability is challenging. In this study, a novel hybrid architecture was constructed, which exhibited excellent oxygen reduction reaction performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Zaoxue Yan, Yanqi Zhang, Chengjing Dai, Zongyao Zhang, Mingmei Zhang, Wei Wei, Xiaomeng Lv, Xinhong Zhao
Summary: By encapsulating large Pt shell/Ni core particles with thick and porous nitrogen-doped carbon layers, excellent stability and high activity of the composite catalyst were achieved, maintaining high oxygen reduction activity value even after a large number of cyclic voltammetry cycles.
Article
Chemistry, Multidisciplinary
Gil-Ryeong Park, Seung Geun Jo, Anuraj Varyambath, Jeonghyun Kim, Jung Woo Lee
Summary: Nitrogen-doped reduced graphene oxide with Pd4.7Ru nanoparticles showed efficient catalytic activity in oxygen reduction reaction, with pyridinic nitrogen atoms acting as anchoring sites for particle bonding. The optimal composition of Pd and Ru at 4.7:1 ratio exhibited high durability and excellent ORR activity, making it a potential candidate for fuel cell applications.
Article
Chemistry, Physical
Yafeng Zhang, Kai Ye, Qingqing Gu, Qike Jiang, Juan Qin, Deying Leng, Qianru Liu, Bing Yang, Feng Yin
Summary: In this study, Pd@Pt-based core-shell nanoparticles were successfully synthesized using a versatile co-reduction method, with the ability to effectively tune the shell component and improve the oxygen reduction reaction (ORR) activity. By incorporating a third metal into the shell layer, the activity of the catalysts was significantly enhanced, showing lower activity decay after cycling compared to the catalyst without the third metal.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jingyu Guan, Shaoxuan Yang, Tongtong Liu, Yihuan Yu, Jin Niu, Zhengping Zhang, Feng Wang
Summary: The development of platinum-based oxygen reduction reaction electrocatalysts with good resistance to poisoning is crucial for practical fuel cell applications. A surface-engineering approach using alloy PtBi shells to prepare nanostructured Pt alloys showed significantly improved ORR performance compared to benchmark Pt/C, with enhanced tolerance to methanol and carbon monoxide. The observed enhancement in performance is attributed to increased compressive strain and charge displacement via Pt-Bi bonding.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Environmental
Qi Xue, Hui-Ying Sun, Ya-Nan Li, Ming-Jun Zhong, Fu-Min Li, Xinlong Tian, Pei Chen, Shi-Bin Yin, Yu Chen
Summary: The study successfully developed a rapid synthesis method for high-quality Au@Ir core-shell nanowires, demonstrating their potential application in electrocatalysis with superior catalytic activity and durability.
CHEMICAL ENGINEERING JOURNAL
(2021)
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)