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Ultrahigh Oxygen Evolution Reaction Activity Achieved Using Ir Single Atoms on Amorphous CoOx Nanosheets

Journal Article · · ACS Catalysis
 [1];  [2];  [1];  [3];  [3];  [3];  [3];  [3];  [4];  [5];  [2];  [3]
  1. Southern University of Science and Technology, Shenzhen, Guangdong (China); Univ. of Electronic Science and Technology of China, Chengdu (China)
  2. Oregon State Univ., Corvallis, OR (United States)
  3. Southern University of Science and Technology, Shenzhen, Guangdong (China)
  4. Univ. of Electronic Science and Technology of China, Chengdu (China)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)

Developing efficient electrocatalysts for an oxygen evolution reaction (OER) is important for renewable energy storage. Here, we design high-density Ir single-atom catalysts supported by CoOx amorphous nanosheets (ANSs) for the OER. Experimental results show that Ir single atoms are anchored by abundant surface-absorbed O in CoOx ANSs. Ir single-atom catalysts possess ultrahigh mass activity that is 160-fold of commercial IrO2. The OER of IrCoOx ANSs reached a record low onset overpotential of less than 30 mV. In situ X-ray absorption spectroscopy reveals that Ir-O-Co pairs directly boosted the OER efficiency and enhanced the Ir stability.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China; Oregon State Univ., Corvallis, OR (United States)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1777190
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 1 Vol. 11; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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