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Two-Dimensional Conductive Ni-HAB as a Catalyst for the Electrochemical Oxygen Reduction Reaction

Journal Article · · ACS Applied Materials and Interfaces
 [1];  [2];  [2];  [3];  [4];  [5];  [2];  [6]
  1. Stanford Univ., CA (United States); OSTI
  2. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis
  3. KTH Royal Inst. of Technology, Stockholm (Sweden); Stanford Univ., CA (United States)
  4. Department of Chemical Engineering, University of California Davis, 1 Shields Avenue, Davis, California 95616, United States
  5. Stanford Univ., CA (United States). SUNCAT Center for Interface Science and Catalysis; Technical Univ. of Denmark, Lyngby (Denmark)
  6. Stanford Univ., CA (United States)

Catalytic systems whose properties can be systematically tuned via changes in synthesis conditions are highly desirable for the next-generation catalyst design and optimization. Herein, we present a two-dimensional (2D) conductive metal–organic framework consisting of M-N4 units (M = Ni, Cu) and a hexaaminobenzene (HAB) linker as a catalyst for the oxygen reduction reaction. By varying synthetic conditions, we prepared two Ni-HAB catalysts with different crystallinities, resulting in catalytic systems with different electric conductivities, electrochemical activity, and stability. We show that crystallinity has a positive impact on conductivity and demonstrate that this improved crystallinity/conductivity improves the catalytic performance of our model system. Additionally, density functional theory simulations were performed to probe the origin of M-HAB’s catalytic activity, and they suggest that M-HAB’s organic linker acts as the active site with the role of the metal being to modulate the linker sites’ binding strength.

Research Organization:
Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0008685
OSTI ID:
1801855
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 35 Vol. 12; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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