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One stable electrocatalyst for two evolution reactions by one-pot combustion synthesis.

Authors :
Wang, Boyang
Zhou, Yue
Hou, Qiankun
Han, Yidong
Huo, Weirong
Luo, Tianyong
Lin, Bin
Source :
International Journal of Hydrogen Energy. Sep2020, Vol. 45 Issue 43, p22691-22699. 9p.
Publication Year :
2020

Abstract

NiFeO x is a high-active electrocatalyst for oxygen evolution reaction (OER) in alkaline media, which gradually deactivate in the long run due to Fe loss from the active sites into media solution during electrocatalysis. Herein, we propose a promising stable CeNiFeO x electrocatalyst for oxygen and hydrogen evolution reactions (OER&HER) by a facile one-pot combustion synthesis. The X-ray diffraction (XRD) results indicate that both nickel and iron ions are successfully incorporated into ceria lattices to form a pure fluorite phase of CeNiFeO x nanopowders, indicating a new achievement of as high as 20% of Ni/Fe solubility in the ceria lattice for the first time. The electrochemical measurements indicate that CeNiFeO x exhibits the high OER activity of NiFeO x electrocatalyst and the enhanced stability of oxygen evolution electrocatalysts. The Ce 0.8 Ni 0.15 Fe 0.05 O x with a single phase of cubic fluorite structure among all shows the most efficient activity with the overpotential of 325 mV for OER and 337 mV for HER at the current density of 10 mA cm−2 in 1 M KOH than the pure CeO x , NiFeO x and other CeNiFeO x nanoelectrocatalysts. After 1000 cycles, the Ce 0.8 Ni 0.15 Fe 0.05 O x nano electrocatalyst exhibits the remarkably improved stability for OER compared to NiFeO x electrocatalyst. These findings demonstrate a facile approach to develop high-active and durable electrocatalysts under alkaline conditions for overall water splitting. • A high-stable CeNiFeO x electrocatalyst is developed for alkaline water splitting. • A one-pot combustion synthesis is useful to OER and HER electrocatalysts. • A new achievement of as high as 20% of Ni/Fe solubility in ceria is reported. • Ce 0.8 Ni 0.15 Fe 0.05 O x shows superior electrocatalytic bifunctional performance. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03603199
Volume :
45
Issue :
43
Database :
Academic Search Index
Journal :
International Journal of Hydrogen Energy
Publication Type :
Academic Journal
Accession number :
145117906
Full Text :
https://doi.org/10.1016/j.ijhydene.2020.06.077