4.6 Article

CaSnO3: An Electrocatalyst for Two-Electron Water Oxidation Reaction to Form H2O2

期刊

ACS ENERGY LETTERS
卷 4, 期 1, 页码 352-357

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsenergylett.8b02303

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资金

  1. Stanford Woods Institute for the Environment
  2. Stanford Natural Gas Initiative
  3. Basic Research Lab Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2017R1A2B3010927, 2018M3C1B7021994, 2016M3D1A1027664]

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The two-electron water oxidation reaction (2e-WOR) is a promising route for distributed electrochemical synthesis of hydrogen peroxide (H2O2), an effective and green oxidizer, bleaching agent, and antiseptic. To date, the best electrocatalyst for 2e-WOR, in terms of selectivity against the competing 4e-WOR to form O-2, is BiVO4. Nevertheless, BiVO4 is unstable and has a high overpotential of similar to 340 mV at 0.2 mA/cm(2) for 2e-WOR. Herein, we use density functional theory to identify a new, efficient, selective, and stable electrocatalyst for 2e-WOR, i.e., the ternary oxide calcium stannate (CaSnO3). Our experiments show that CaSnO3 achieves an overpotential of 230 mV at 0.2 mA/cm(2), peak Faraday efficiency of 76% for 2e-WOR at 3.2 V vs the reversible hydrogen electrode (RHE), and stable performance for over 12 h, outperforming BiVO4 in all aspects. This work demonstrates the promise of CaSnO3 as a selective and cost-effective electrocatalyst candidate for H2O2 production from water oxidation.

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