Enhanced hydrogen storage in sandwich-structured rGO/Co1-xS/rGO hybrid papers through hydrogen spillover

JOURNAL OF POWER SOURCES

卷:358

Article

Han, Lu¹  Qin, Wei²  Jian, Jiahuang¹  Liu, Jiawei²  Wu, Xiaohong¹  Gao, Peng³  Hultman, Benjamin⁴  Wu, Gang⁴ 

[1] Harbin Inst Technol, Sch Chem & Chem Engn, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[3] Hangzhou Normal Univ, Coll Mat Chem & Chem Engn, Hangzhou 311121, Zhejiang, Peoples R China

[4] Univ Buffalo State Univ New York, Dept Chem & Biol Engn, Buffalo, NY 14260 USA

关键词: Hydrogen storage;    Reduced graphene oxides;    Cobalt sulfide;    Hydrogen spillover;    Binder-free electrode;   

DOI  :  10.1016/j.jpowsour.2017.05.026

来源: Elsevier

【 摘 要 】

Reduced graphene oxide (rGO) based two-dimensional (2D) structures have been fabricated for electrochemical hydrogen storage. However, the effective transfer of atomic hydrogen to adjacent rGO surfaces is suppressed by binders, which are widely used in conventional electrochemical hydrogen storage electrodes, leading to a confining of the performance of rGO for hydrogen storage. As a proof of concept experiment, a novel strategy is developed to fabricate the binder-free sandwich-structured rGO/Co1-x/rGO hybrid paper via facile ball milling and filtration process. Based on the structure investigation, Co1-xS is immobilized in the space between the individual rGO sheets by the creation of chemical bridges (C-S bonds). Through the C-S bonds, the atomic hydrogen is transferred from Co1-xS to rGO accompanying a C-H chemical bond formation. When used as an electrode, the hybrid paper exhibits an improved hydrogen storage capacity of 3.82 wt% and, most importantly, significant cycling stability for up to 50 cycles. Excluding the direct hydrogen storage contribution from the Co1-xS in the hybrid paper, the hydrogen storage ability of rGO is enhanced by 10x through the spillover effects caused by the Co1-xS modifier. (C) 2017 Elsevier B.V. All rights reserved.

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