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Highly active sites of nivb nanoparticles dispersed onto graphene nanosheets towards efficient and pH-universal overall water splitting

引用

Journal of Energy Chemistry 2021年第7期30卷 237-246页

作者： Muhammad Arif Ghulam Yasin Muhammad Shakeel Muhammad Asim Mushtaq Wen Ye Xiaoyu Fang Shengfu Ji Dongpeng Yan Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China College of Chemistry and Molecular Engineering Zhengzhou UniversityZhengzhou 450001HenanChina

Production of hydrogen(H2) and oxygen(O2) through electrocatalytic water splitting is one of the sustainable,green and pivotal ways to accomplish the ever-increasing demands for renewable energy sources,but remains a big challenge because of the uphill reaction during overall water ***,we develop high-performance non-noble metal electrocatalysts for pH-universal water splitting,based on nickel/vanadium boride(nivb) nanoparticles/reduced graphene oxide(rgo) hybrid(nivb/rgo)through a facile chemical reduction approach under ambient *** virtue of more exposure to surface active sites,superior electron transfer capability and strong electronic coupling,the asprepared nivb/rgo heterostructure needs pretty low overpotentials of 267 and 151 mV to deliver a current density of 10 mA cm^(-2) for oxygen evolution reaction(OER) and hydrogen evolution reaction(HER)respectively,with the corresponding Tafel slope of 44 and 88 mV dec^(-1) in 1.0 M ***,the nivb/rgo electrocatalysts display a promising performance in a wide-pH conditions that require low overpotential of 310,353 and 489 mV to drive a current density of 10 mA cm^(-2) for OER under 0.5 M KOH,0.05 M H2SO4 and 1.0 M phosphate buffer solution(PBS) respectively,confirming the excellent electrocata lytic performance among state-of-the-art Ni-based electrocatalysts for overall water ***,the interfacial tuning based on incorporation of active heterostructure may pave a new route to develop bifunctional,cost-effective and efficient electrocatalyst systems for water splitting and H2 production.

关键词： Electrocatalysis Oxygen evolution reaction Hydrogen evolution reaction nivb/rgo heterostructure pH-universal

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