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Hierarchical Co(OH)F Superstructure Built by Low‐Dimensional Substructures for Electrocatalytic Water Oxidation
Author(s) -
Wan Shanhong,
Qi Jing,
Zhang Wei,
Wang Weina,
Zhang Shaokang,
Liu Kaiqiang,
Zheng Haoquan,
Sun Junliang,
Wang Shuangyin,
Cao Rui
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.201700286
Subject(s) - materials science , overpotential , electrocatalyst , nanorod , oxygen evolution , water splitting , chemical engineering , porosity , catalysis , nanotechnology , interconnectivity , electrode , aqueous solution , electrochemistry , composite material , photocatalysis , chemistry , organic chemistry , artificial intelligence , computer science , engineering
The development of new materials/structures for efficient electrocatalytic water oxidation, which is a key reaction in realizing artificial photosynthesis, is an ongoing challenge. Herein, a Co(OH)F material as a new electrocatalyst for the oxygen evolution reaction (OER) is reported. The as‐prepared 3D Co(OH)F microspheres are built by 2D nanoflake building blocks, which are further woven by 1D nanorod foundations. Weaving and building the substructures (1D nanorods and 2D nanoflakes) provides high structural void porosity with sufficient interior space in the resulting 3D material. The hierarchical structure of this Co(OH)F material combines the merits of all material dimensions in heterogeneous catalysis. The anisotropic low‐dimensional (1D and 2D) substructures possess the advantages of a high surface‐to‐volume ratio and fast charge transport. The interconnectivity of the nanorods is also beneficial for charge transport. The high‐dimensional (3D) architecture results in sufficient active sites per the projected electrode surface area and is favorable for efficient mass diffusion during catalysis. A low overpotential of 313 mV is required to drive an OER current density of 10 mA cm −2 on a simple glassy carbon (GC) working electrode in a 1.0 m KOH aqueous solution.