Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 7, Pages 6288-6298Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b17257
Keywords
transition metal hydrogen phosphate; template-directing; ultrathin flake; OER electrocatalyst; mass and charge transfer
Funding
- National University of Singapore
- Ministry of Education, Singapore
- National Research Foundation (NRF), Prime Minister's Office, Singapore, under its Campus for Research Excellence and Technological Enterprise (CREATE) program
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Electrochemical splitting of water to produce hydrogen and oxygen is an important process for many energy storage and conversion devices. Developing efficient, robust, low-cost, and earth-abundant electrocatalysts for the oxygen evolution reaction (OER) is therefore of great importance. Herein, we report a novel method to prepare two-dimensional cobalt hydrogen phosphate (CoHPi) through chemical conversion of alpha-Co(OH)(2) precursor at room temperature. The CoHPi nanoflakes with the thickness of 3 nm contain HPO42- anions, which have been demonstrated to serve as a proton acceptor in proton-coupled electron-transfer (PCET) process of OER. Due to their ultrathin structure and the PCET merit of anions, the CoHPi nanoflakes show enhanced OER activity as well as excellent stability in prolonged OER operation. Through further mechanism study, the observed performances can be ascribed to enriched active sites, surface superhydrophilicity, and rapid electron/proton and mass transfers.
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