1. Phosphorus‐Doping‐Induced Optimization of Atomic Hydrogen Binding Energy in MoSe2 under High Coverage for Efficient Electrocatalytic Hydrogen Evolution Reactions.
- Author
-
Zhang, Long, Li, Jiang, Yang, Zehui, Sun, Lan, Chen, Guanjun, An, Wangcong, Cheng, Hanyue, Wang, Hongbo, Wang, Xingang, Chen, Yongnan, and Ma, Fei
- Subjects
HYDROGEN evolution reactions ,HYDROGEN as fuel ,ATOMIC hydrogen ,BINDING energy ,ULTRACOLD molecules ,CARBON paper ,OXYGEN evolution reactions ,ELECTROCATALYSTS - Abstract
Self‐standing two‐dimensional P‐doped molybdenum diselenide (MoSe2) nanosheets were synthesized on carbon fiber paper (CFP) (P‐doped MoSe2/CFP) using a hydrothermal reaction followed by phosphorization and were subsequently used as a high‐efficiency hydrogen evolution reaction (HER) electrocatalyst. Nanosheet aggregation was remarkably inhibited, and numerous active sites were exposed. The H adsorption and desorption capacities of MoSe2 were optimized by doping P atoms in the MoSe2 lattice. Electrochemical testing indicated that the overpotential (η50) required by P‐doped MoSe2/CFP was only 186 mV, which was much lower than that of the as‐prepared MoSe2/CFP (237 mV). The Tafel slope of P‐doped MoSe2/CFP was 54.3 mV ⋅ dec−1, which was remarkably lower than that of the as‐prepared MoSe2/CFP (79.8 mV ⋅ dec−1). The Gibbs energy of the H atoms adsorbed on P‐doped MoSe2 (ΔGH*) reached the lowest value (0.202 eV) when the hydrogen coverage (θH) was 75 %. For MoSe2, the lowest ΔGH* value was 0.296 eV when θH was 25 %. The adsorption and desorption of H atoms at the active sites of P‐doped MoSe2 occurred easier than at the active sites of MoSe2. Moreover, the P doping effect facilitated the formation of more Hads species during the Volmer reaction and substantially accelerated the kinetics of the HER. [ABSTRACT FROM AUTHOR]
- Published
- 2021
- Full Text
- View/download PDF