Hollow ZIF-67 derived porous cobalt sulfide as an efficient bifunctional electrocatalyst for overall water splitting

被引：13
作者：
Zhang, Zewu [1 ,2 ,3 ]
Li, Shijia [1 ,2 ]
Bu, Xiaohai [1 ,2 ,3 ]
Dai, Yifan [1 ,2 ]
Wang, Jingxi [1 ,2 ]
Bao, Xuwen [1 ,2 ]
Wang, Tong [1 ,2 ]
机构：
[1] Nanjing Inst Technol, Sch Mat Sci & Engn, Nanjing 21167, Jiangsu, Peoples R China
[2] Jiangsu Key Lab Adv Struct Mat & Applicat Technol, Nanjing 21167, Jiangsu, Peoples R China
[3] Southeast Univ, Sch Mat Sci & Engn, Nanjing 21189, Jiangsu, Peoples R China
来源：
NEW JOURNAL OF CHEMISTRY | 2021年 / 45卷 / 37期
基金：
中国博士后科学基金;
关键词：
METAL-ORGANIC FRAMEWORK; NANOSHEET ARRAYS; PERFORMANCE; OXYGEN;
D O I：
10.1039/d1nj01874d
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The design and construction of noble-metal free electrocatalysts with high efficiency for both hydrogen and oxygen evolution reactions holds promise for advancing the production of H-2 fuels through the overall water splitting process. Herein, we report a novel hollow near-spherical superstructure of a cobalt sulfide electrocatalyst (h-CoxSy) via the accumulation of two-dimensional cobalt sulfide nanosheets in a sulfurization-pyrolysis process of hollow ZIF-67. Benefiting from the porous characteristics, a unique hollow superstructure and saw-toothed edges derived from the hollow ZIF-67 precursor, the h-CoxSy exhibited outstanding bifunctional electrocatalytic performances, with overpotentials of 320 and 295 mV to achieve 10 mA cm(-2) for the OER and HER, respectively. When h-CoxSy was employed as both the anode and cathode for overall water splitting, a current density of 10 mA cm(-2) can be obtained at a cell voltage of 1.88 V, along with impressive operation stability.
引用
收藏
页码：17313 / 17319
页数：7
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