Article
Chemistry, Applied
Yahao Li, Ketao Zang, Xuezhi Duan, Jun Luo, De Chen
Summary: This study reports a highly efficient method for preparing ORR electrocatalysts with a large number of atomically dispersed Fe active sites, and reveals the major contribution of atomically dispersed Fe to the ORR activity.
JOURNAL OF ENERGY CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Yufei Zhao, Ziyan Shen, Juanjuan Huo, Xianjun Cao, Pengfei Ou, Junpeng Qu, Xinming Nie, Jinqiang Zhang, Minghong Wu, Guoxiu Wang, Hao Liu
Summary: In this study, Fe single atom catalysts with sulfur and oxygen functional groups near the atomically dispersed metal centers were prepared, which showed highly efficient oxygen reduction reaction (ORR) performance. The Fe1/NSOC catalyst exhibited a half-wave potential of 0.92 V vs. RHE, surpassing commercial Pt/C (0.88 V), Fe single atoms on N-doped carbon (Fe1/NC, 0.89 V), and most reported nonprecious metal catalysts. Spectroscopic measurements revealed that the presence of sulfur group induced the formation of epoxy groups near the FeN4S2 centers, which not only modulated the electronic structure of Fe single atoms but also participated in the catalytic process to improve the kinetics. Density functional theory calculations demonstrated that the sulfur and epoxy groups engineered the charges of Fe reactive center, facilitating the reductive release of OH* (rate-limiting step) and boosting the overall oxygen reduction efficiency.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Xiaoyu Yi, Huijuan Yang, Xiaoxuan Yang, Xiaokang Li, Cheng Yan, Jianhua Zhang, Lina Chen, Jinjuan Dong, Jian Qin, Gaini Zhang, Jingjing Wang, Wenbin Li, Zhiyou Zhou, Gang Wu, Xifei Li
Summary: This study reports a novel strategy to construct a dual-metal catalyst by introducing a single Co atom in the second coordination shell of the Fe center. The dual-metal catalyst exhibits excellent ORR activity and long-term durability, demonstrating significant potential in the application of Zn-air batteries.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Jie Zhang, Mengwei Li, Qilong Ye, Peng Rao, Sanying Hou, Guanghua Wang, Yijie Deng, Xinlong Tian
Summary: A facile solid-state synthesis approach has been developed for the preparation of a hierarchical porous Fe-N-C oxygen reduction reaction (ORR) catalyst enriched with graphite carbon layer encapsulated Fe/Fe3C nanoparticles and Fe-Nx sites nanocomposites. This catalyst exhibits excellent ORR activity, surpassing commercial Pt/C in terms of half-wave potential and kinetic current densities. It also demonstrates a low yield of H2O2, 4-electron transfer pathway, and good stability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Davide Menga, Jian Liang Low, Yan-Sheng Li, Iztok Arcon, Burak Koyutuerk, Friedrich Wagner, Francisco Ruiz-Zepeda, Miran Gaberscek, Beate Paulus, Tim-Patrick Fellinger
Summary: By identifying a paradigm shift in the synthesis of Fe-N-C catalysts and applying fundamental principles, it was possible to overcome the dilemma of low active site densities. Through successive low- and high-temperature ion exchange reactions, a high loading of atomically dispersed Fe was achieved, resulting in a phase-pure catalyst entirely composed of tetrapyrrolic Fe-N-4 sites. The density of these sites was significantly higher than previously reported, showcasing a promising advancement in single-site fuel cell catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Applied
Chao Yang, Shanshan Shang, Qinfen Gu, Jin Shang, Xiao-yan Li
Summary: In this research, functional carbon nanotubes with multi-active sites were synthesized as an electrocatalyst for sustainable metal-air batteries, exhibiting superb bifunctional performance. The unique structure of the electrocatalyst was characterized using high-resolution synchrotron powder X-ray diffraction and X-ray absorption spectroscopy. The rechargeable zinc-air battery based on the electrocatalyst showed superior performance in terms of open-circuit voltage, power density, and cycling stability.
JOURNAL OF ENERGY CHEMISTRY
(2022)
Article
Chemistry, Physical
Seunggun Choi, Jiseok Kwon, Seonghan Jo, Sojung Kim, Keemin Park, Sungmin Kim, Hyuksu Han, Ungyu Paik, Taeseup Song
Summary: A highly efficient and durable HER and ORR bifunctional electrocatalyst derived from Ni metalorganic frameworks, NiFeP@Ni_NC, is proposed in this study to address the issue of undesirable oxidation of cathode electrocatalysts during alkaline electrolysis. By introducing decoupled active sites for ORR and HER in the hybrid material, excellent bifunctional stability is achieved for NiFeP@Ni_NC, demonstrating a strategy that can be widely extended to design bifunctional electrocatalysts with improved stability in alkaline electrolysis.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Physical
Mengjin Wen, Zihan Li, Rui Wang, Zhengmin Li, Xin Liu, Guixue Wang, Guangwen Xie, Luhua Jiang
Summary: A new type of superior activity and highly cost-effective amorphous electrocatalyst Co-Mo-Fe on nickel foam supports was prepared by facile one-step rapid electrodeposition. The doping of Fe significantly improved the oxygen evolution capacity of the Co-Mo-Fe system, and the synergistic effect of the three metals and the doping of the third metal iron increased the oxygen evolution active sites of the whole system significantly.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Kesi Xiong, Haixia Zhao, Fanglin Du, Guangwen Xie, Tian Xie
Summary: A new type of highly active and cost-effective nanoporous W-doped Ni-Fe-P catalyst on nickel foam (NF) was synthesized by a facile electroless plating method. The W-doped Ni-Fe-P/NF catalysts exhibited extraordinary catalytic activity for hydrogen evolution reaction (HER) in alkaline media, capable of yielding a current density of -10 mA cm-2 at an overpotential of only 68 mV. Furthermore, the catalysts also showed efficient activity towards oxygen evolution reaction (OER) with an overpotential of 210 mV at j = 10 mA cm-2 as well. The W-doped Ni-Fe-P/NF electrocatalyst exhibited a long-term durability over 13 h test.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Chenxi Hu, Huihui Jin, Bingshuai Liu, Lvhan Liang, Zhe Wang, Ding Chen, Daping He, Shichun Mu
Summary: The introduction of Vitamin C can effectively suppress the free metal ions on the surface of metal organic frameworks, increase Fe-N4 active sites, and enhance catalytic performance, demonstrating the universality of this strategy.
Article
Chemistry, Physical
Xuhui Li, Yanpin Liu, Haifei Xu, Yangfan Zhou, Xinbing Chen, Zhongwei An, Yu Chen, Pei Chen
Summary: Highly efficient bifunctional catalysts for ORR and OER are essential for rechargeable Zn-air batteries. In this study, Fe3O4 and CoO nanoparticles were integrated into carbon nanoflowers to create an electrocatalyst that reduced the potential gap between ORR and OER to 0.79 V. The Zn-air battery assembled with this catalyst exhibited superior performance compared to Pt/C, including a higher open-circuit voltage, longer discharge time, higher specific capacity, and larger power density.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Maosong Liu, Lijuan Wang, Long Zhang, Yiran Zhao, Kangmin Chen, Yanxiao Li, Xiaohua Yang, Long Zhao, Shuhui Sun, Jianming Zhang
Summary: In the past decade, atomically dispersed Fe active sites on carbon materials have emerged as promising catalysts for the oxygen reduction reaction. However, the production of highly active catalysts is restricted by material cost and difficulty of microstructure design. The authors demonstrate a facile in-situ xerogel assisted synthetic strategy to construct Fe-N-C catalysts with excellent activity and potential application.
Article
Chemistry, Physical
Yan Sang, Gaofei Ding, Zixuan Guo, Yingying Xue, Guohong Li, Ruoxue Zhang
Summary: Fe-Ni3S2 @ NiFe LDH catalyst with abundant electroactive sites and superior OER performance is successfully synthesized through a simple method, providing a feasible approach for the design of highly efficient earth-abundant nonprecious metal electrocatalysts for OER.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yan Sang, Gaofei Ding, Zixuan Guo, Yingying Xue, Guohong Li, Ruoxue Zhang
Summary: The study demonstrates the successful synthesis of Fe-Ni3S2@NiFe LDH as an efficient and earth-abundant nonprecious metal electrocatalyst for oxygen evolution reaction (OER). The catalyst exhibits excellent OER performance in 1.0 M KOH solution and shows good durability. This research provides a feasible approach for the design of highly efficient nonprecious metal electrocatalysts for OER.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Environmental
Xupo Liu, Yunpeng Liu, Cuicui Zhang, Ye Chen, Guanyu Luo, Zhitao Wang, Deli Wang, Shuyan Gao
Summary: Regulating pore architecture and electronic structure is important for enhancing the oxygen electrocatalytic activity of M-N-C catalysts. In this study, N, S co-doped hollow carbon nanocages confined Fe, Co bimetallic sites (FeCo-NS-HNCs) were fabricated through a surface bridging strategy. The synergy between metal sites and N, S co-doping improved the adsorption/desorption characteristics of M-Nx sites and the Kirkendall effect facilitated the construction of hollow carbon nanocages, leading to excellent bifunctional oxygen electrocatalytic activity of FeCo-NS-HNCs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Electrochemistry
Shu Yuan, Qian Gao, Changchun Ke, Tao Zuo, Junbo Hou, Junliang Zhang
Summary: To meet the demands of high-speed commercialization of electrochemical energy storage and conversion devices, the development of high-performance and low-cost electrode materials is crucial. Mesoporous carbon, with its excellent intrinsic characteristics and flexible structure, has attracted much attention as it offers opportunities to improve energy or power density, durability, and reduce electrode cost. This paper first reviews primary methods for preparing mesoporous carbons, then analyzes the obstacles in lithium batteries, supercapacitors, proton exchange membrane fuel cells, and water electrolyzers, and systematically introduces the recent progress of mesoporous carbon based electrode designs in solving these obstacles. Finally, the current challenges and future directions of developing mesoporous carbon based electrode materials in electrochemical energy storage and conversion devices are outlined. Through this review, a concise introduction to mesoporous carbon is provided, along with meaningful references for future research.
Review
Chemistry, Physical
Huiyuan Li, Xiaojing Cheng, Xiaohui Yan, Shuiyun Shen, Junliang Zhang
Summary: This review comprehensively explores the influences of key materials degradation in membrane electrode assemblies (MEAs) on oxygen transport resistance in proton exchange membrane fuel cells (PEMFCs). The study finds that carbon corrosion in cathode catalyst layers (CCLs) leads to pore structure destruction and impact on ionomer distribution, catalyst degradation increases the local oxygen transport resistance, degradation of ionomer changes its structure and worsens the local oxygen transport, and loss of carbon and PTFE in gas diffusion layers (GDLs) results in higher hydrophilicity and increased oxygen transport resistance.
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
Engineering, Environmental
Liuxuan Luo, Zehao Tan, Cehuang Fu, Rui Xue, Xiaojing Cheng, Tianzi Bi, Lutian Zhao, Yangge Guo, Xiyang Cai, Jiewei Yin, Shuiyun Shen, Junliang Zhang
Summary: Increasing the accessible active sites and improving the intrinsic activity are effective strategies for enhancing the electrocatalytic activity of nanomaterials. In this study, highly uniform Pd nanotetrahedrons with Pt-doped surfaces are synthesized and supported onto carbon black, showing improved electrocatalytic performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Huiyuan Li, Jiabin You, Xiaojing Cheng, Xiaohui Yan, Shuiyun Shen, Junliang Zhang
Summary: This paper investigates the effects of Co2+ contamination on the structure of ionomer films and the corresponding local oxygen transport behavior in cathode catalyst layers (CCLs). The study finds that Co2+ contamination reduces water content and increases the modulus of the ultrathin ionomer film, while also affecting the aggregation size of the ionomer. Additionally, the contamination increases the local oxygen transport resistance and decreases the peak power density of the fuel cell.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jing Li, Fan Yang, Min Jiang, Xiyang Cai, Qiaodan Hu, Junliang Zhang
Summary: The development of perovskite-type electrocatalysts with high activity, excellent durability, and affordable cost is important for promoting clean energy technologies. In this study, Bi(0.15)Sr(0.85)Co(1-x)FexO(3-delta) (x=0.2, 0.4, 0.6, 0.8, 1) perovskite materials were prepared and their OER electrocatalytic activity and durability were investigated. The results showed that the composition BiSC0.8F0.2 exhibited impressive electrocatalytic performances with low overpotential and excellent long-time durability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Review
Chemistry, Physical
Shiqing Liu, Shu Yuan, Yuwei Liang, Huiyuan Li, Zhiling Xu, Qian Xu, Jiewei Yin, Shuiyun Shen, Xiaohui Yan, Junliang Zhang
Summary: Proton exchange membrane fuel cells (PEMFCs) are important for achieving decarbonized energy demand. However, their commercialization has been hindered by high costs. This paper focuses on reducing the amount of platinum (Pt) in PEMFCs to address the cost issue. Specifically, it summarizes various electrode design methods to optimize the local transport resistance of oxygen in the cathode catalyst layer (CCL). The insights provided in this paper offer recommendations for high-efficiency low-platinum fuel cell fabrication and design.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Longhai Zhang, Lina Ning, Xueqing Yang, Sheng Zeng, Tian Yuan, Gaopeng Li, Changchun Ke, Junliang Zhang
Summary: The fuel cell hybrid powertrain is a potential power supply system for fuel cell vehicles but faces the issue of excessive fuel consumption. In order to effectively manage fuel consumption, a power and control system for fuel cell city buses is proposed through simulation study and road test verifications. The research results show that the half-power prediction energy management strategy effectively reduces fuel consumption by 7.1% and battery cycle by 6.0% compared to the stepped management strategy of battery SOC.
AUTOMOTIVE INNOVATION
(2023)
Article
Nanoscience & Nanotechnology
Zhiling Xu, Shu Yuan, Lu An, Shuiyun Shen, Qian Xu, Xiaohui Yan, Junliang Zhang
Summary: One approach to improving the proton conductivity of nanoscale ultrathin Nafion films is by adjusting the catalyst-ionomer interaction. In this study, ultrathin films were prepared on SiO2 substrates with negative or positive surface charges. The results showed that the negatively charged substrate resulted in faster film formation and increased proton conductivity, while the positively charged substrate led to slower film formation and decreased proton conductivity. The interaction between surface charges and Nafion molecules affected molecular orientation, surface energy, and phase separation, influencing proton conductivity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Thermodynamics
Shu Yuan, Congfan Zhao, Xiyang Cai, Lu An, Shuiyun Shen, Xiaohui Yan, Junliang Zhang
Summary: This review discusses the evolution and transport processes of gas bubbles, as well as the mechanisms by which bubbles impact PEMWE cell performance. It also summarizes the latest methods to mitigate bubble-induced performance losses. Similarities between PEMWE and AEMWE are explored, and principles of bubble management are presented, along with future research priorities and suggestions.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2023)
Article
Chemistry, Physical
Yang Zhang, Yuanting Peng, Qiqi Wan, Donghao Ye, Ao Wang, Longhai Zhang, Wenxing Jiang, Yingying Liu, Jin Li, Xiaodong Zhuang, Junliang Zhang, Changchun Ke
Summary: A fuel cell based on B10H14 was studied, which achieved a peak power density of 110.82 mW/cm2, comparable to common DMFCs. The new fuel cell exhibited a higher open circuit voltage than DMFCs and other DLFCs, indicating that the Nafion membrane is effective in suppressing fuel crossover. This opens up a new way to utilize the chemical energy of B10H14 and develops a promising fuel cell for high specific energy applications.
MATERIALS TODAY ENERGY
(2023)
