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Oxygen vacancy-rich amorphous FeNi hydroxide nanoclusters as an efficient electrocatalyst for water oxidation

Journal Article · · Journal of Energy Chemistry
 [1];  [1];  [2];  [3];  [4];  [5];  [1]
  1. Chinese Academy of Sciences (CAS), Dalian (China)
  2. Hanyang Univ., Seoul (Korea, Republic of)
  3. Jiangsu University, Zhenjiang (China)
  4. Skolkovo Institute of Science and Technology, Moscow (Russia)
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States)

Here, a one-pot strategy is presented to directly synthesize amorphous FexNiy hydroxide nanoclusters (denoted as ANC-FexNiy, <2 nm) with oxygen vacancies induced by ionic liquids. The ANC-FexNiy catalyst presents abundant catalytic sites and high intrinsic conductivity. As such, the optimized ANC-Fe1Ni2 exhibits high activity in oxygen evolution reaction (OER) with a Tafel slope of 39 mV dec–1 and an overpotential of 266 mV at 10 mA cm–2. Notably, the optimized ANC-Fe1Ni2 shows an extraordinarily large mass activity of 3028 A gFeNi–1 at the overpotential of 300 mV, which is ~24-fold of commercial RuO2 catalyst. The superior activity of these FexNiy hydroxide nanoclusters is ascribed to (i) the amorphous and distorted structure with abundant oxygen vacancies, and (ii) enhanced active site density by downsizing the ANC-FexNiy clusters. This strategy provides a novel route for enhancing OER electrocatalytic performance and highly encouraging for the future application of amorphous metal hydroxides in catalysis.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Jiangsu University
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1879835
Journal Information:
Journal of Energy Chemistry, Journal Name: Journal of Energy Chemistry Vol. 71; ISSN 2095-4956
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (4)