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Title: Laser-Irradiated Holey Graphene-Supported Single-Atom Catalyst towards Hydrogen Evolution and Oxygen Reduction

Journal Article · · Advanced Energy Materials
 [1];  [2];  [3];  [4];  [1];  [1];  [5];  [5];  [2];  [6];  [7];  [8];  [4]; ORCiD logo [1]
  1. The Hong Kong Univ. of Science and Technology, Kowloon (Hong Kong)
  2. Argonne National Lab. (ANL), Lemont, IL (United States)
  3. Northwestern Polytechnical Univ. (NPU), Xi'an (China)
  4. Univ. of California, Irvine, CA (United States)
  5. Tianjin Univ. (China)
  6. Washington Univ., St. Louis, MO (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  7. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  8. Argonne National Lab. (ANL), Lemont, IL (United States); Stanford Univ., CA (United States); Imam Abdulrahman Bin Faisal Univ. (IAU), Dammam (Saudi Arabia)

Abstract Single‐atom catalysts (SAC) can boost the intrinsic catalytic activity of hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR). However, the challenge remains due to the complex synthesis process and insufficient stability. A sustainable approach is applied to synthesizing SACs through laser irradiation and gaining mesoporous graphene oxide (MGO). The surface dangling bonds of nitrogen‐doped MGO (NMGO) extract metal atoms species from Co or Fe metal foams and convert them to SAC via an appropriate synthesis approach. Notably, the Co‐NMGO electrocatalyst requires low potentials of 146 mV to convey a current density of 10 mA cm −2 towards HER. Similarly, the Fe‐NMGO electrocatalyst offers an onset of 0.79 V towards ORR in acidic solution. The individual metal atoms are confirmed via aberration‐corrected scanning transmission electron microscopy, and X‐ray absorption near‐edge structure and extended X‐ray absorption fine structure. Density functional theory calculations by applying the grand canonical potential kinetics model revealed that Co‐NMGO shows the optimum free reaction energy of −0.17 eV at −0.1 V for HER, and Fe‐NMGO has less limiting potential than that of Co‐NMGO for ORR case. This work opens a new approach towards the synthesis of SAC and its mechanistic understandings.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1854518
Alternate ID(s):
OSTI ID: 1820222
Journal Information:
Advanced Energy Materials, Vol. 11, Issue 40; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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