Self-derivation and reconstruction of silver nanoparticle reinforced cobalt-nickel bimetallic hydroxides through interface engineering for overall water splitting

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外文摘要：Designing efficient and long-lasting non-metal electrocatalysts is an urgent task for addressing the issue of kinetic hysteresis in electrochemical oxidation reactions.The bimetallic hydroxides,catalyzing the oxygen evolution reaction(OER),have significant research potential because hydroxide reconstruction to generate an active phase is a remarkable advantage.Herein,the complete reconstruction of ultrathin CoNi(OH)2 nanosheets was achieved by embedding Ag nanoparticles into the hydroxide to induce a spon-taneous redox reaction(SRR),forming heterojunction Ag@CoNi(OH)2 for bifunctional hydrolysis.Theoretical calculations and in situ Raman and ex situ characterizations revealed that the inductive effect of the Ag cation redistributed the charge to promote phase transformation to highly activate Ag-modified hydroxides.The Co-Ni dual sites in Co/NiOOH serve as novel active sites for optimizing the intermediates,thereby weakening the barrier formed by OOH*.Ag@CoNi(OH)2 required a potential of 1.55 V to drive water splitting at a current density of 10 mA cm-2,with nearly 98.6％Faraday efficiency.Through ion induction and triggering of electron regulation in the OER via the synergistic action of the heterogeneous interface and surface reconstruction,this strategic design can overcome the limited capacity of bimetallic hydroxides and bridge the gap between the basic theory and industrialization of water decomposition.

外文关键词：

Surface reconstructionBimetallic hydroxidesAg nanoparticleOperando RamanOverall water splitting

作者：

Yan Li、Jie Han、Weiwei Bao、Junjun Zhang、Taotao Ai、Mameng Yang、Chunming Yang、Pengfei Zhang

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作者单位：

National and Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology,School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723000,Shaanxi,China

State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering,College of Chemistry & Chemical Engineering,Ningxia University,Yinchuan 750021,Ningxia,China

College of Chemistry & Chemical Engineering,Yan'an University,Yan'an 716000,Shaanxi,China

School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

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基金：

Inner Mongolia Research and Development Program PlanInner Mongolia Research and Development Program Plan国家自然科学基金陕西省自然科学基金

项目编号：

2021ZD00422021EEDSCXSFQZD006219021232023-JC-ZD-22

出版年：

2024

DOI：

10.1016/j.jechem.2023.11.043

能源化学