In Situ Formation of Surface-Induced Oxygen Vacancies in Co9S8/CoO/NC as a Bifunctional Electrocatalyst for Improved Oxygen and Hydrogen Evolution Reactions

被引:15
作者
Rehman, Khalil Ur [1 ]
Airam, Shaista [1 ]
Lin, Xiangyun [1 ]
Gao, Jian [1 ]
Guo, Qiang [1 ]
Zhang, Zhipan [1 ]
机构
[1] Beijing Inst Technol, Key Lab Photoelect Electrophoton Convers Mat, Key Lab Cluster Sci, Minist Educ China,Sch Chem & Chem Engn, Beijing 100081, Peoples R China
关键词
oxygen vacancies; heterojunction; oxygen evolution reaction; hydrogen evolution reaction; METAL-ORGANIC FRAMEWORK; EFFICIENT ELECTROCATALYSTS; COO NANOPARTICLES; COBALT; GRAPHENE; NANOSHEETS; REDUCTION; CO9S8; HETEROSTRUCTURES; CHALLENGES;
D O I
10.3390/nano11092237
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Creating oxygen vacancies and introducing heterostructures are two widely used strategies in Co-based oxides for their efficient electrocatalytic performance, yet both strategies have rarely been used together to design a bifunctional electrocatalyst for an efficient overall water splitting. Herein, we propose a facile strategy to synthesize oxygen-defect-rich Co9S8/CoO hetero-nanoparticles with a nitrogen-doped carbon shell (ODR-Co9S8/CoO/NC) through the in situ conversion of heterojunction along with surface-induced oxygen vacancies, simply via annealing the precursor Co3S4/Co(OH)(2)/ZIF-67. The as-prepared ODR-Co9S8/CoO/NC shows excellent bifunctional catalytic activities, featuring a low overpotential of 217 mV at 10 mA cm(-2) in the oxygen evolution reaction (OER) and 160 mV at 10 mA cm(-2) in the hydrogen evolution reaction (HER). This performance excellency is attributed to unique heterostructure and oxygen defects in Co9S8/CoO nanoparticles, the current work is expected to offer new insights to the design of cost-effective, noble-metal-free electrocatalysts.
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页数:14
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