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Single Iridium Atom Doped Ni2P Catalyst for Optimal Oxygen Evolution

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.1c04682· OSTI ID:2574241
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [4];  [3];  [1];  [1];  [1];  [5];  [1]
  1. Southern University of Science and Technology (SUSTech), Shenzhen (China)
  2. Central South University, Changsha (China)
  3. Oregon State Univ., Corvallis, OR (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States)
  5. Univ. of Pennsylvania, Philadelphia, PA (United States)

Single-atom catalysts (SACs) with 100% active sites have excellent prospects for application in the oxygen evolution reaction (OER). However, further enhancement of the catalytic activity for OER is quite challenging, particularly for the development of stable SACs with overpotentials <180 mV. Here, we report an iridium single atom on Ni2P catalyst (IrSA-Ni2P) with a record low overpotential of 149 mV at a current density of 10 mA·cm–2 in 1.0 M KOH. The IrSA-Ni2P catalyst delivers a current density up to ∼28-fold higher than that of the widely used IrO2 at 1.53 V vs RHE. Both the experimental results and computational simulations indicate that Ir single atoms preferentially occupy Ni sites on the top surface. The reconstructed Ir–O–P/Ni–O–P bonding environment plays a vital role for optimal adsorption and desorption of the OER intermediate species, which leads to marked enhancement of the OER activity. Additionally, the dynamic “top-down” evolution of the specific structure of the Ni@Ir particles is responsible for the robust single-atom structure and, thus, the stability property. In conclusion, this IrSA-Ni2P catalyst offers novel prospects for simplifying decoration strategies and further enhancing OER performance.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Natural Science Foundation of China; Shenzhen Clean Energy Research Institute; Shenzhen Peacock Plan; Entrepreneurial Research Team Program
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2574241
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 34 Vol. 143; ISSN 0002-7863; ISSN 1520-5126
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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