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Differentiated Modulating the Electronic Structure of NiFe@Ni/Fe-MnOx via Phase Transformation Engineering to Synergy Promote Bifunctional Water Splitting Reactions.
Small
January 2025
Faculty of Materials Science and Engineering, Analysis and Testing Research Center, Kunming University of Science and Technology, Kunming, 650093, P. R. China.
Modulating electronic structure to balance the requirement of both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for developing bifunctional catalysts. Herein, phase transformation engineering is utilized to separately regulate catalyst structure, and the designed NiFe@Ni/Fe-MnOOH schottky heterojunction exhibits remarkable bifunctional electrocatalytic activity with low overpotentials of 19 and 230 mV at 10 mA cm for HER and OER in 1M KOH, respectively. Meanwhile, an anion-exchange membrane water electrolyzer employing NiFe@Ni/Fe-MnOOH as electrodes shows low voltages of 1.
View Article and Find Full Text PDFAtomically Dispersed Metal-Nitrogen-Carbon Catalysts for Acidic Oxygen Reduction Reaction.
ACS Appl Mater Interfaces
January 2025
School of Integrated Circuits, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, P. R. China.
Designing efficient and cost-effective electrocatalysts toward oxygen reduction reaction (ORR) under demanding acidic environments plays a critical role in advancing proton exchange membrane fuel cells (PEMFCs). Metal-nitrogen-carbon (M-N-C) catalysts with atomically dispersed metals have gained attention for their affordability, excellent catalytic performance, and distinctive features including consistent active sites and high atomic utilization. Over the past decade, significant achievements have been made in this field.
View Article and Find Full Text PDFPromoting defect formation and inhibiting hydrogen evolution by S-doping NiFe layered double hydroxide for electrocatalytic reduction of nitrate to ammonia.
Water Res
December 2024
Jiangsu Key Laboratory of New Power Batteries, Jiangsu Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China. Electronic address:
Activation of HO cleavage for H* production by defect engineering eliminates the insufficient supply of protons in the NORR process under neutral conditions. However, it remains challenging to precisely control the defect formation for optimizing the equilibrium between H* production and H* binding. Here, we propose a strategy to boost defect generation through S-doping induced NiFe-LDH lattice distortion, and successfully optimize the balance of H* production and binding.
View Article and Find Full Text PDFInterfacial Engineering of Pillared Co(II) Metal-Organic Framework@NiMn-Layered Double Hydroxide Nanocomposite for Oxygen Evolution Reaction Electrocatalysis.
Inorg Chem
January 2025
Department of Inorganic Chemistry, Faculty of Science, University of Maragheh, Maragheh 55181-83111, Iran.
Clean energy conversion and storage require simple, economical, and effective electrode materials to achieve promising results. The development of high-performance electrocatalysts with adequate stability and cost-effectiveness is essential to ensure low overpotentials toward the oxygen evolution reaction (OER). Herein, a cobalt-based metal-organic framework with 4,4,4-6T14 topology in combination with various ratios of NiMn-layered double hydroxide (Co-MOF@%NiMn-LDH, = 5, 10, 20, and 40%) is applied as an effective electrocatalyst for the oxidation of water.
View Article and Find Full Text PDFCopper-cobalt diatomic bifunctional oxygen electrocatalysts based on three-dimensional porous nitrogen-doped carbon frameworks for high-performance zinc-air batteries.
J Colloid Interface Sci
December 2024
State Key Laboratory of Reliability and Intelligence of Electrical Equipment, Hebei University of Technology, Tianjin 300401, PR China; Engineering Research Center of Ministry of Education for Intelligent Rehabilitation Device and Detection Technology, Hebei University of Technology, Tianjin 300401, PR China; Hebei Key Laboratory of Smart Sensing and Human-Robot Interaction, Hebei University of Technology, Tianjin 300401, PR China; School of Mechanical Engineering, Hebei University of Technology, 5340 Xiping Road, Beichen District, Tianjin 300401, PR China. Electronic address:
Transition-metal-loaded carbon-based electrocatalysts are promising alternatives to conventional precious metal electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in high-performance zinc-air batteries. However, efficiently doping transition-metal single atoms onto carbon-based frameworks is a significant challenge. Herein, an improved template-sacrificing method combining a two-step carbonization process is proposed to fabricate Cu/Co diatomic sites coanchored on a three-dimensional nitrogen-doped carbon-based framework.
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