期刊
ACS CATALYSIS
卷 10, 期 1, 页码 412-419出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b03623
关键词
cobalt phosphide; nanoframe; Prussian blue analogue; density functional theory; water splitting
资金
- National Natural Science Foundation of China [21872105, 21573160]
- Fundamental Research Funds for the Central Universities
- Science & Technology Commission of Shanghai Municipality [14DZ2261100]
- Natural Science Foundation of Zhejiang Province [LQ20B030001]
Transition-metal phosphides have been shown to be promising electrocatalysts in water for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). To maximize reactivity toward both entails limiting the catalyst size while maintaining reactivity and avoiding aggregation. Frame-like hollow nanostructures (nanoframes) provide the required open structure with sufficient channels into the interior volume. We demonstrate here the design and synthesis of CoP nanoframes (CoP NFs) by a strategy involving precipitation, chemical etching, and low-temperature phosphidation steps. It results in impressive bifunctional catalytic activities for both HER and OER and consequently enables a highly efficient water electrolyzer with a current density of 10 mA cm(-2) driven by a cell voltage of only 1.65 V. The strategy has been generalized for the preparation of nanoframe Co dichalcogenides CoX2 NFs, with X = S, Se, and Te. The results of electrochemical measurements, supported by density functional theory calculations, show that HER catalytic activities for the series follow the sequence: CoP NFs > CoSe2 NFs > CoS2 NFs > CoTe2 NFs.
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