MOF-Derived Hierarchical CoSe2 with Sheetlike Nanoarchitectures as an Efficient Bifunctional Electrocatalyst.
Inorg Chem
; 59(17): 12778-12787, 2020 Sep 08.
Article
em En
| MEDLINE
| ID: mdl-32838527
ABSTRACT
The exploitation of efficient and stable non-noble-metal bifunctional electrocatalysts is key to the development of hydrogen production technology. Although some progress has been made in the synthesis of transition-metal selenide nanostructures, the preparation of metal-organic framework (MOF)-derived transition-metal selenide electrode materials with more active sites and nanosheet structures remains a significant challenge. Herein, on the basis of the MOFs, the hierarchical CoSe2-160 microcube with sheetlike nanoarchitectures was successfully prepared. In addition, the morphology of cobalt selenides was controlled by adjusting the hydrothermal reaction temperature. Electrochemical experiments show that the CoSe2-160 microcube has a splendid electrocatalytic performance with 10 mA cm-2 at an overpotential of 156 mV and a small Tafel slope of 40 mV dec-1 (in 0.5 M H2SO4) for hydrogen evolution reaction as well as 328 mV and a small Tafel slope of 73 mV dec-1 (in 1 M KOH) for oxygen evolution reaction, respectively. This arises from the nanosheet structures, large surface areas, and abundant active sites. This strategy provides a neoteric synthesis route for the MOF-derived transition-metal selenides with a striking electrocatalytic performance.
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01-internacional
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MEDLINE
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En
Ano de publicação:
2020
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Article