期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 30, 页码 33595-33602出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c04302
关键词
metal-organic frameworks; sulfides; electrodeposition; heterostructural catalysts; hydrogen evolution
资金
- City University of Hong Kong [9667212]
Metal-organic frameworks (MOFs) can act as precursors or templates to a myriad of nanostructured materials that are difficult to prepare. In this study, Co-MOF nanorods (NRs) were prepared at room temperature followed by a calcination and hydrothermal sulfurization strategy to transform the MOF into CoS NRs on carbon cloth (CoS/CC). Intriguingly, the resultant 3D sulfide NRs can serve as scaffolds to electrodeposit layered double hydroxides (LDHs) on the surfaces. Through combining the advantages of structure and composition, the as-fabricated CoS@CoNi-LDH/CC exhibits remarkable electrocatalytic activity for the hydrogen evolution reaction (HER). An overpotential of 124 mV is needed to reach a current density of 10 mA cm(-2) with a Tafel slope of only 89 mV dec(-1), which is superior to that of pure CoS/CC (141 mV along with 103 mV dec(-1)) and other reported cobalt-based catalysts. Notably, after the chronopotentiometry test for 50 h, the overpotential of CoS@CoNi-LDH/CC increased by 17 mV only.
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