期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 3, 页码 1772-1779出版社
AMER CHEMICAL SOC
DOI: 10.1021/am507373g
关键词
polymorphic CoSe2; hydrogen evolution reaction; electrodeposition; earth-abundant elements; electrocatalysis
资金
- Natural Science Foundation of China [21276231, 21476201, U1462201, U1162128]
We report polymorphic CoSe2 (p-CoSe2) with mixed orthorhombic and cubic phases as a highly active electrocatalyst toward hydrogen evolution reaction (HER). The p-CoSe2 is obtained by calcining CoSex via electrodeposition at 300 degrees C. The results of X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM) demonstrated the crystal structure of p-CoSe2. The p-CoSe2 exhibits excellent electrocatalytic activity for HER with a low onset overpotential of -70 mV and a small Tafel slope of similar to 30 mV/decade, which are basically state-of-the-art performance of earth-abundant electrocatalysts. The HER performance of p-CoSe2 was much higher than that of amorphous CoSex, cubic CoSe2, and CoSe. This study offers a competitive electrocatalyst for HER and opens up a new strategy to the synthesis of catalysts for energy conversion.
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