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Free‐Standing NiO@C Nanobelt as an Efficient Catalyst for Water Splitting
Author(s) -
Dong Qiuchun,
Sun Chencheng,
Dai Ziyang,
Zang Xiaoxian,
Dong Xiaochen
Publication year - 2016
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201601059
Subject(s) - tafel equation , overpotential , water splitting , oxygen evolution , non blocking i/o , materials science , chemical engineering , catalysis , electrochemistry , electrocatalyst , transition metal , aqueous solution , inorganic chemistry , electrode , nanotechnology , chemistry , organic chemistry , photocatalysis , engineering
Cost‐effective and high‐efficiency electrocatalysts for water splitting are important for the production of renewable energy conversion and storage systems. Herein, a 3 D NiO nanobelt electrode was synthesized by direct oxidation of nickel foam using the hydrothermal method. Electrochemical studies reveal that the 3 D NiO nanobelt electrode exhibits excellent electrocatalytic activities for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) with low onset overpotential, small Tafel slope, and very eminent electrochemical stability in the standard aqueous solution of 1.0 m KOH. More importantly, the OER activity of 3 D NiO nanobelt can be enhanced by the wrapping of N‐doped carbon (NiO@C), which can achieve an overpotential of 500 mV at 100 mA cm −2 , a low Tafel slope of 92 mV dec −1 , and distinguished electrochemical stability. This strategy provides a general route to prepare 3 D nanostructured catalyst for water splitting by directly using transition‐metal foam as metal source and substrate.