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Phase‐Junction Electrocatalysts towards Enhanced Hydrogen Evolution Reaction in Alkaline Media
Author(s) -
Fu Qiang,
Wang Xianjie,
Han Jiecai,
Zhong Jun,
Zhang Tongrui,
Yao Tai,
Xu Chengyan,
Gao Tangling,
Xi Shibo,
Liang Ce,
Xu Lingling,
Xu Ping,
Song Bo
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202011318
Subject(s) - nip , overpotential , catalysis , electrocatalyst , hydrogen , electrolysis , chemical engineering , hydrogen production , materials science , dissociation (chemistry) , nickel , electrolysis of water , alkaline water electrolysis , chemistry , inorganic chemistry , electrode , metallurgy , electrochemistry , composite material , organic chemistry , engineering , electrolyte
Abstract To ensure sustainable hydrogen production by water electrolysis, robust, earth‐abundant, and high‐efficient electrocatalysts are required. Constructing a hybrid system could lead to further improvement in electrocatalytic activity. Interface engineering in composite catalysts is thus critical to determine the performance, and the phase‐junction interface should improve the catalytic activity. Here, we show that nickel diphosphide phase junction ( c ‐NiP 2 / m ‐NiP 2 ) is an effective electrocatalyst for hydrogen production in alkaline media. The overpotential (at 10 mA cm −2 ) for NiP 2 ‐650 ( c / m ) in alkaline media could be significantly reduced by 26 % and 96 % compared with c ‐NiP 2 and m ‐NiP 2 , respectively. The enhancement of catalytic activity should be attributed to the strong water dissociation ability and the rearrangement of electrons around the phase junction, which markedly improved the Volmer step and benefited the reduction process of adsorbed protons.