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Hexagonal Sphericon Hematite with High Performance for Water Oxidation
Author(s) -
Odedairo Taiwo,
Yan Xuecheng,
Yao Xiangdong,
Ostrikov Kostya Ken,
Zhu Zhonghua
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201703792
Subject(s) - hematite , overpotential , materials science , oxygen evolution , hexagonal crystal system , water splitting , nanoparticle , chemical engineering , catalysis , nanotechnology , crystallography , metallurgy , chemistry , photocatalysis , electrode , electrochemistry , biochemistry , engineering
A cost‐effective hexagonal sphericon hematite with predominant (110) facets for the oxygen evolution reaction (OER) is demonstrated. Sequential incorporation of near‐atomic uniformly distributed Ce species and Ni nanoparticles into selected sites of the hematite induces a complex synergistic integration phenomenon that enhances the overall catalytic OER performance. This cheap hexagonal sphericon hematite (Fe ≈ 98%) only needs a small overpotential (η) of 0.34 V to reach 10 mA cm −2 , superior to commercial IrO 2 and more expensive Co‐, Ni‐, and Li‐based electrocatalysts.