Nanocrystalline Co0.85Se Anchored on Graphene Nanosheets as a Highly Efficient and Stable Electrocatalyst for Hydrogen Evolution Reaction

被引：119
作者：
Yu, Bo [1 ]
Qi, Fei [1 ]
Chen, Yuanfu [1 ]
Wang, Xinqiang [1 ]
Zheng, Binjie [1 ]
Zhang, Wanli [1 ]
Li, Yanrong [1 ]
Zhang, Lai-Chang [2 ]
机构：
[1] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devic, Chengdu 610054, Sichuan, Peoples R China
[2] Edith Cowan Univ, Sch Engn, 270 Joondalup Dr, Perth, WA 6027, Australia
来源：
ACS APPLIED MATERIALS & INTERFACES | 2017年 / 9卷 / 36期
基金：
中国国家自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
Co0.85Se nanocrystals; graphene; solvothermal reaction; transition-metal chalcogenide; hydrogen evolution reaction; electrocatalytic activity; NOBLE-METAL ELECTROCATALYST; HIERARCHICAL ARCHITECTURE; FREESTANDING CATHODE; ULTRATHIN NANOSHEETS; NISE2; NANOCRYSTALS; ORGANIC FRAMEWORK; 3D ELECTRODE; COSE2; MOS2; PERFORMANCE;
D O I：
10.1021/acsami.7b09108
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
For the first time, a porous and conductive Co0.85Se/graphene network (CSGN), constructed by Co0.85Se nanocrystals being tightly connected with each other and homogeneously anchored on few-layered graphene nanosheets, has been synthesized by a facile one-pot solvothermal method. Compared to unhybridized Co0.85Se, CSGN exhibits much faster kinetics and better electrocatalytic behavior for hydrogen evolution reaction (HER). The HER mechanism of CSGN is improved to Volmer-Tafel combination, instead of Volmer-Heyrovsky combination, for Co0.85Se. CSGN has a very low Tafel slope of 34.4 mV/dec, which is much lower than that of unhybridized Co0.85Se (41.8 mV/dec) and is the lowest ever reported for Co0.85Se-based electrocatalysts. CSGN delivers a current density of 55 mA/cm(2) at 250 mV overpotential, much larger than that of Co0.85Se (33 mA/cm(2)). Furthermore, CSGN shows superior electrocatalytic stability even after 1500 cycles. The excellent HER performance of CSGN is attributed to the unique porous and conductive network, which can not only guarantee interconnected conductive paths in the whole electrode but also provide abundant catalytic active sites, thereby facilitating charge transportation between the electrocatalyst and electrolyte. This work provides insight into rational design and low-cost synthesis of nonprecious transition-metal chalcogenide-based electrocatalysts with high efficiency and excellent stability for HER.
引用
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页码：30703 / 30710
页数：8
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