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Fe‐Doped Ni 3 C Nanodots in N‐Doped Carbon Nanosheets for Efficient Hydrogen‐Evolution and Oxygen‐Evolution Electrocatalysis
Author(s) -
Fan Haosen,
Yu Hong,
Zhang Yufei,
Zheng Yun,
Luo Yubo,
Dai Zhengfei,
Li Bing,
Zong Yun,
Yan Qingyu
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201706610
Subject(s) - tafel equation , overpotential , electrocatalyst , oxygen evolution , bifunctional , materials science , nanodot , water splitting , chemical engineering , catalysis , inorganic chemistry , nickel , nanotechnology , chemistry , electrochemistry , electrode , metallurgy , organic chemistry , engineering , photocatalysis
Uniform Ni 3 C nanodots dispersed in ultrathin N‐doped carbon nanosheets were successfully prepared by carburization of the two dimensional (2D) nickel cyanide coordination polymer precursors. The Ni 3 C based nanosheets have lateral length of about 200 nm and thickness of 10 nm. When doped with Fe, the Ni 3 C based nanosheets exhibited outstanding electrocatalytic properties for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). For example, 2 at % Fe (atomic percent) doped Ni 3 C nanosheets depict a low overpotential (292 mV) and a small Tafel slope (41.3 mV dec −1 ) for HER in KOH solution. An outstanding OER catalytic property is also achieved with a low overpotential of 275 mV and a small Tafel slope of 62 mV dec −1 in KOH solution. Such nanodot‐incorporated 2D hybrid structures can serve as an efficient bifunctional electrocatalyst for overall water splitting.