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General π‐Electron‐Assisted Strategy for Ir, Pt, Ru, Pd, Fe, Ni Single‐Atom Electrocatalysts with Bifunctional Active Sites for Highly Efficient Water Splitting
Author(s) -
Lai WeiHong,
Zhang LiFu,
Hua WeiBo,
Indris Sylvio,
Yan ZiChao,
Hu Zhe,
Zhang Binwei,
Liu Yani,
Wang Li,
Liu Min,
Liu Rong,
Wang YunXiao,
Wang JiaZhao,
Hu Zhenpeng,
Liu HuaKun,
Chou ShuLei,
Dou ShiXue
Publication year - 2019
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.201904614
Subject(s) - bifunctional , water splitting , oxygen evolution , catalysis , octahedron , chemistry , atom (system on chip) , bifunctional catalyst , crystallography , materials science , electrochemistry , electrode , crystal structure , computer science , photocatalysis , biochemistry , embedded system
Both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) are crucial to water splitting, but require alternative active sites. Now, a general π‐electron‐assisted strategy to anchor single‐atom sites (M=Ir, Pt, Ru, Pd, Fe, Ni) on a heterogeneous support is reported. The M atoms can simultaneously anchor on two distinct domains of the hybrid support, four‐fold N/C atoms (M@NC), and centers of Co octahedra (M@Co), which are expected to serve as bifunctional electrocatalysts towards the HER and the OER. The Ir catalyst exhibits the best water‐splitting performance, showing a low applied potential of 1.603 V to achieve 10 mA cm −2 in 1.0 m KOH solution with cycling over 5 h. DFT calculations indicate that the Ir@Co (Ir) sites can accelerate the OER, while the Ir@NC 3 sites are responsible for the enhanced HER, clarifying the unprecedented performance of this bifunctional catalyst towards full water splitting.