4.6 Article

Quasi-Two-Dimensional Earth-Abundant Bimetallic Electrocatalysts for Oxygen Evolution Reactions

Journal

ACS ENERGY LETTERS
Volume 6, Issue 9, Pages 3367-3375

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.1c01302

Keywords

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Funding

  1. U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0020283]
  2. China Scholarship Council, China (CSC) [201906680059]
  3. U.S. Department of Energy (DOE) [DE-SC0020283] Funding Source: U.S. Department of Energy (DOE)

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This study successfully synthesized bimetallic Co-Mo-O ultrathin nanosheets with enriched surface catalytic active site ratio, among which nanosheets with 2:1 Co-to-Mo ratio showed significantly enhanced OER catalytic activity. This 2D morphology of bimetallic materials introduces a promising possibility for creating high-performance electrocatalysts.
The extremely large surface area offered by quasi-two-dimensional (2D) nanostructures is a great advantage for catalytic applications. While bimetallic materials have been discovered as a group of promising catalysts for electrochemical water splitting, a facile and reliable synthesis approach toward 2D morphology to fully release its electrochemical catalytic potential is still lacking. In this work, bimetallic Co-Mo-O ultrathin nanosheets were synthesized by ionic layer epitaxy with controlled composition ratio. The Co-Mo-O nanosheets exhibited a quadrangle shape with a uniform thickness of similar to 2.5 nm. This 2D morphology largely enriched the surface catalytic active site ratio. Particularly, nanosheets with 2:1 Co-to-Mo ratio showed a substantially enhanced OER catalytic activity with a 3 orders of magnitude higher mass activity compared to benchmark IrO2 and RuO2 in an alkaline environment. This study introduces a promising possibility for creating high-performance electrocatalysts from 2D bimetallic materials with a high efficiency for material utilization.

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