期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 8, 页码 9865-9874出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c20820
关键词
heterostructure catalyst; Co9S8/Cu2S; oxygen evolution reaction; hydrogen evolution reaction; overall water splitting
资金
- National Natural Science Foundation of China [51771068, 51771067, 51871088, 52001108]
- Natural Science Foundation of Hebei Province [E2018202082, B2018202167]
This study presents a novel heterostructure catalyst Co9S8/Cu2S/CF with low overpotentials for water splitting. The strong interfacial interaction promotes water molecule dissociation, achieving efficient alkaline water splitting.
Electrocatalytic water splitting is a promising technology for large-scale hydrogen production. However, it requires efficient catalysts to overcome the large overpotentials in the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, we report a novel heterostructure catalyst Co9S8/Cu2S on copper foam (Co9S8/Cu2S/CF) with multistep impregnation and electrodeposition. Due to the strong interfacial interaction, the interfacial electrons transfer from Co sites to S sites, which promote the adsorption of oxygen-containing intermediates, water molecules, as well as the dissociation of water molecules. Therefore, the heterostructure catalyst exhibits low overpotentials of 195 mV for OER and 165 mV for HER at 10 mA cm(-2), respectively. Moreover, it only needs 1.6 V to realize water splitting at 10 mA cm(-2) in a two-electrode cell. This work provides an efficient method to tailor the surface electronic structure through specific morphological design and construct a heterostructure interface to achieve alkaline water splitting.
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