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Constructing Conductive Interfaces between Nickel Oxide Nanocrystals and Polymer Carbon Nitride for Efficient Electrocatalytic Oxygen Evolution Reaction
Author(s) -
Liao Chengan,
Yang Baopeng,
Zhang Ning,
Liu Min,
Chen Guoxin,
Jiang Xiaoming,
Chen Gen,
Yang Junliang,
Liu Xiaohe,
Chan TingShan,
Lu YingJui,
Ma Renzhi,
Zhou Wei
Publication year - 2019
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201904020
Subject(s) - materials science , non blocking i/o , catalysis , chemical engineering , oxide , nitride , nickel , oxygen evolution , inorganic chemistry , x ray photoelectron spectroscopy , transition metal , electrode , nanotechnology , chemistry , electrochemistry , layer (electronics) , organic chemistry , engineering , metallurgy
Combining transition metal oxide catalysts with conductive carbonaceous material is a feasible way to improve the conductivity. However, the electrocatalytic performance is usually not distinctly improved because the interfacial resistance between metal oxides and carbon is still large and thereby hinders the charge transport in catalysis. Herein, the conductive interface between poorly conductive NiO nanoparticles and semi‐conductive carbon nitride (CN) is constructed. The NiO/CN exhibits much‐enhanced oxygen evolution reaction (OER) performance than corresponding NiO and CN in electrolytes of KOH solution and phosphate buffer saline, which is also remarkably superior over NiO/C, commercial RuO 2 , and mostly reported NiO‐based catalysts. X‐ray photoelectron spectroscopy and extended X‐ray absorption fine structure spectrum reveal that a metallic Ni–N bond is formed between NiO and CN. Density functional theory calculations suggest that NiO and CN linked by a Ni–N bond possess a low Gibbs energy for OER intermediate adsorptions, which not only improves the transfer of charge but also promotes the transmission of mass in OER. The metal–nitrogen bonded conductive and highly active interface pervasively exists between CN and other transition metal oxides including Co 3 O 4 , CuO, and Fe 2 O 3 , making it promising as an inexpensive catalyst for efficient water splitting.