4.6 Article

Nitrogen and phosphorus Co-doped non stoichiometric cobalt selenides (Co0.85Se) ultrathin nanosheets as highly efficient electrocatalysts for the hydrogen evolution reaction

期刊

MATERIALS CHEMISTRY AND PHYSICS
卷 278, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2021.125693

关键词

Hydrogen evolution reaction; Cobalt selenide; Co-doping; Nanosheets; Catalytic activity

资金

  1. National Natural Science Foundation of China [21875205]
  2. Natural Science Foundation of Hebei [206Z4404G, B2021203016]
  3. Hebei Youth Top-notch Talent Support Program
  4. Hebei Province Foundation for the Returned Overseas Chinese Scholars [C20200509]

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Nitrogen-phosphorus co-doped ultrathin nanosheets of Co0.85Se were synthesized using a one-step hydrothermal method. These nanosheets exhibit more active sites and high conductivity, resulting in excellent performance and stability for the hydrogen evolution reaction.
Two-dimensional (2D) non-stoichiometric cobalt selenide (Co0.85Se) has the specific electrochemical performances of exposing more active sites and the high conductivity, which makes it a unique advantage as promising candidates for hydrogen evolution reaction (HER). Hence, we used the one-step hydrothermal method to synthesize nitrogen-phosphorus co-doped Co0.85Se (N,P-Co0.85Se) ultrathin nanosheets for catalyzing HER. Due to the co-doping of N and P, more active sites were generated, thus making N,P-Co0.85Se ultrathin nanosheets have excellent HER performance. The LSV test results in 1 M KOH showed that the overpotential of N,P-Co0.85Se ultrathin nanosheets was 210 mV under the current density of 10 mA cm-2, 130 mV lower than that of the undoped Co0.85Se nanosheets (340 mV). The N,P-Co0.85Se ultrathin nanosheets also had excellent stability that the overpotential merely increased by 12 mV after 1000 cycles, much lower than that of the un-doped Co0.85Se nanosheets (48 mV). This one-step hydrothermal method can provide an efficient and facile idea for fabrication of various co-doped metal selenide nanocatalysts with high electrocatalytic performance.

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