Anion modulate the morphological and electronic structure of NiFe-based electrocatalyst for efficient urea oxidation-assisted water electrolysis

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外文摘要：Renewable energy-driven water electrolysis is considered as an environmentally friendly hydrogen(H2)production technology.Replacing the oxygen evolution reaction(OER)with the urea oxidation reaction(UOR)is a more effective way to improve the energy efficiency of H2 generation.Herein,a highly effi-cient 2D NiFeMo-based UOR catalyst and 1D NiFeMo-based HER catalyst are prepared by adjusting the concentration of MoO4-.The MoO4-can serve as the key regulator to adjust the balance between the electrolytic dissociation(α)of the reactants and the supersaturation(S)to modulate the morphological and electronic structure.The prepared 2D NiFeMo nanosheet UOR catalyst and 1D NiFeMo nanorod HER catalyst can achieve a current density of 100 mA cm-2 at a potential of 1.36 and 0.062 V,respectively.In a HER/UOR system,a cell voltage of 1.58 V is needed to achieve a current density of 100 mA cm-2.The HER/UOR system operated stably for over 60 h with 3 times the direct water electrolysis current den-sity.Moreover,the in situ Raman characterization coupled with XPS analysis clarifies that the addition of high-valence Mo can lower the transition energy barrier between the low and high oxidation state of Ni,which in turn lowers the overpotential of UOR.This work provides a novel strategy for synthesizing morphology-dependent electrocatalysts for different catalytic systems.

外文关键词：

Urea oxidation reactionNiFe-based catalystHydrogen evolutionMorphological and electronic structureActive sites

作者：

Duowen Ma、Yansong Jia、Yang Li、Haibin Yang、Fengzhi Wang、Xinyu Zheng、Guining Shao、Qi Xiong、Zhihao Shen、Min Liu、Zirui Lou、Chaohua Gu

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作者单位：

School of Advanced Materials,Peking University Shenzhen Graduate School,Shenzhen 518055,China

Institute of Process Equipment,College of Energy Engineering,Zhejiang University,Hangzhou 310000,China

Hydrogen Energy Institute,Zhejiang University,Hangzhou 310000,China

Experimental Center,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310000,China

State Grid Zhejiang Electric Power CO.,LTD Research Institute,Hangzhou 310000,China

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基金：

National Natural Science Foundation of ChinaScience Foundation of Donghai LaboratoryR&D Project of State Grid Corporation of China

项目编号：

22308322DH-2022ZY00105108-202218280A-2-439-XG

出版年：

2024

DOI：

10.1016/j.jmst.2024.01.054

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.197(30)