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Engineering the Electrical Conductivity of Lamellar Silver‐Doped Cobalt(II) Selenide Nanobelts for Enhanced Oxygen Evolution
Author(s) -
Zhao Xu,
Zhang Hantao,
Yan Yu,
Cao Jinhua,
Li Xingqi,
Zhou Shiming,
Peng Zhenmeng,
Zeng Jie
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201609080
Subject(s) - tafel equation , conductivity , oxygen evolution , selenide , cobalt , lamellar structure , electrical resistivity and conductivity , materials science , chemical engineering , catalysis , inorganic chemistry , nanotechnology , chemistry , electrode , electrochemistry , metallurgy , organic chemistry , selenium , electrical engineering , engineering
Precisely engineering the electrical conductivity represents a promising strategy to design efficient catalysts towards oxygen evolution reaction (OER). Here, we demonstrate a versatile partial cation exchange method to fabricate lamellar Ag‐CoSe 2 nanobelts with controllable conductivity. The electrical conductivity of the materials was significantly enhanced by the addition of Ag + cations of less than 1.0 %. Moreover, such a trace amount of Ag induced a negligible loss of active sites which was compensated through the effective generation of active sites as shown by the excellent conductivity. Both the enhanced conductivity and the retained active sites contributed to the remarkable electrocatalytic performance of the Ag‐CoSe 2 nanobelts. Relative to the CoSe 2 nanobelts, the as‐prepared Ag‐CoSe 2 nanobelts exhibited a higher current density and a lower Tafel slope towards OER. This strategy represents a rational design of efficient electrocatalysts through finely tuning their electrical conductivities.