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Title: Enhanced Activity in Layered Metal-Oxide-Based Oxygen Evolution Catalysts by Layer-by-Layer Modulation of Metal-Ion Identity

Journal Article · · ACS Catalysis
 [1];  [2];  [3]; ORCiD logo [2]; ORCiD logo [3]
  1. Temple University, Philadelphia, PA (United States); North Carolina State University, Raleigh, NC (United States)
  2. Michigan State University, East Lansing, MI (United States)
  3. Temple University, Philadelphia, PA (United States)

Few-layered potassium nickel and cobalt oxides show drastic differences in catalytic activity based on metal ion preorganization. Uniform compositions [(CoO2/K)6 or (NiO2/K)6] show limited activity, while homogeneously mixed-metal cobalt/nickel oxides [(ConNi(1–n)O2/K)6] display moderate improvement. However, a layer-by-layer arrangement of alternating cobalt and nickel oxide sheets [e.g., (CoO2/K/NiO2/K)] provides superior catalytic performance, reducing the oxygen evolution overpotential by ∼200–400 mV. Density functional theory simulations provide an illustration of the electronic properties (density of states and localization of orbitals) that promote catalysis in the layer-segregated materials over those of homogeneous composition. This study reveals that atomic preorganization of metal ions within layered catalysts plays a more crucial role than the overall metal composition in enhancing catalytic efficiency for oxygen evolution.

Research Organization:
US Department of Energy (USDOE), Washington, DC (United States). Office of Science
Sponsoring Organization:
National Science Foundation (NSF) Major Research Instrumentation; National Science Foundation Graduate Research Fellowship; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012575; SC0023356
OSTI ID:
3008122
Journal Information:
ACS Catalysis, Journal Name: ACS Catalysis Journal Issue: 23 Vol. 15; ISSN 2155-5435
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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