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Ni 2 P Interlayer and Mn Doping Synergistically Expedite the Hydrogen Evolution Reaction Kinetics of Co 2 P
Author(s) -
Du Yunmei,
Wang Wensi,
Zhao Huimin,
Liu Yanru,
Li Shaoxiang,
Wang Lei,
Liu Bin
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202005162
Subject(s) - overpotential , phosphide , tafel equation , electrocatalyst , transition metal , materials science , electrochemistry , electrolyte , chemical engineering , hydrogen , catalysis , inorganic chemistry , metal , chemistry , electrode , metallurgy , organic chemistry , engineering
Abstract Transition metal phosphide is regarded as one of the most promising candidates to replace noble‐metal hydrogen evolution reaction (HER) electrocatalysts. Nevertheless, the controllable design and synthesis of transition metal phosphide electrocatalysts with efficient and stable electrochemical performance are still very challenging. Herein, a novel hierarchical HER electrocatalyst consisting of three‐dimensional (3D) coral‐like Mn‐doped Co 2 P@an intermediate layer of Ni 2 P generated in situ by phosphorization on Ni foam (MnCoP/NiP/NF) is reported. Notably, both the incorporation of Mn and introduction of the Ni 2 P interlayer promote Co atoms to carry more electrons, which is beneficial to reduce the force of the Co−H bond and optimize the adsorption energy of hydrogen intermediate (|Δ G H* |), thereby making MnCoP/NiP/NF exhibit outstanding HER performance with onset overpotential and Tafel slope as low as 31.2 mV and 61 mV dec −1 , respectively, in 1 m KOH electrolyte.