TY - JOUR
T1 - Surface decorated cobalt sulfide as efficient catalyst for oxygen evolution reaction and its intrinsic activity
AU - Li, Jingde
AU - Liu, Guihua
AU - Fu, Jing
AU - Jiang, Gaopeng
AU - Luo, Dan
AU - Hassan, Fathy M.
AU - Zhang, Jing
AU - Deng, Ya Ping
AU - Xu, Pan
AU - Ricardez-Sandoval, Luis
AU - Chen, Zhongwei
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/11
Y1 - 2018/11
N2 - Here, we report an efficient surface decorated, e.g. oxidation and nitrogen doped, cobalt sulfide (O-N-Co9S8) oxygen electrocatalyst, which shows excellent activity especially for oxygen evolution reaction (OER), and good stability over 900 charge-discharge cycles at 10 mA cm−2 in Zinc-air battery. Moreover, we found that O-N-Co9S8 was completely converted into Co3O4 after OER, showing oxide is actual active phase. Density functional theory calculations reveal the continuous exposure of oxidized surface Co sites during O-N-Co9S8 → Co3O4 is essential for its high OER activity. These Co sites promote the kinetics for OH∗ transformation to O∗ and also ensure fast O2 desorption. Once Co3O4 is generated, the high activity is contributed by its resulting characteristic surfaces. Thus, we propose and demonstrate that oxides in-situ generated during OER are more active than the directly calcined oxides. This work advances fundamental insight of metal chalcogenides “catalysts” and guides the design of active OER catalysts.
AB - Here, we report an efficient surface decorated, e.g. oxidation and nitrogen doped, cobalt sulfide (O-N-Co9S8) oxygen electrocatalyst, which shows excellent activity especially for oxygen evolution reaction (OER), and good stability over 900 charge-discharge cycles at 10 mA cm−2 in Zinc-air battery. Moreover, we found that O-N-Co9S8 was completely converted into Co3O4 after OER, showing oxide is actual active phase. Density functional theory calculations reveal the continuous exposure of oxidized surface Co sites during O-N-Co9S8 → Co3O4 is essential for its high OER activity. These Co sites promote the kinetics for OH∗ transformation to O∗ and also ensure fast O2 desorption. Once Co3O4 is generated, the high activity is contributed by its resulting characteristic surfaces. Thus, we propose and demonstrate that oxides in-situ generated during OER are more active than the directly calcined oxides. This work advances fundamental insight of metal chalcogenides “catalysts” and guides the design of active OER catalysts.
KW - Cobalt sulfide
KW - Density functional calculations
KW - Metal chalcogenides
KW - Oxygen evolution reaction
KW - Zinc-air battery
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U2 - 10.1016/j.jcat.2018.08.020
DO - 10.1016/j.jcat.2018.08.020
M3 - Article
AN - SCOPUS:85053013111
SN - 0021-9517
VL - 367
SP - 43
EP - 52
JO - Journal of Catalysis
JF - Journal of Catalysis
ER -