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Discovery of LaAlO3 as an efficient catalyst for two-electron water electrolysis towards hydrogen peroxide

Author

Listed:
  • Jihyun Baek

    (Stanford University)

  • Qiu Jin

    (University of Calgary)

  • Nathan Scott Johnson

    (SLAC National Accelerator Laboratory)

  • Yue Jiang

    (Stanford University)

  • Rui Ning

    (Stanford University)

  • Apurva Mehta

    (SLAC National Accelerator Laboratory)

  • Samira Siahrostami

    (University of Calgary)

  • Xiaolin Zheng

    (Stanford University)

Abstract

Electrochemical two-electron water oxidation reaction (2e-WOR) has drawn significant attention as a promising process to achieve the continuous on-site production of hydrogen peroxide (H2O2). However, compared to the cathodic H2O2 generation, the anodic 2e-WOR is more challenging to establish catalysts due to the severe oxidizing environment. In this study, we combine density functional theory (DFT) calculations with experiments to discover a stable and efficient perovskite catalyst for the anodic 2e-WOR. Our theoretical screening efforts identify LaAlO3 perovskite as a stable, active, and selective candidate for catalyzing 2e-WOR. Our experimental results verify that LaAlO3 achieves an overpotential of 510 mV at 10 mA cm−2 in 4 M K2CO3/KHCO3, lower than those of many reported metal oxide catalysts. In addition, LaAlO3 maintains a stable H2O2 Faradaic efficiency with only a 3% decrease after 3 h at 2.7 V vs. RHE. This computation-experiment synergistic approach introduces another effective direction to discover promising catalysts for the harsh anodic 2e-WOR towards H2O2.

Suggested Citation

  • Jihyun Baek & Qiu Jin & Nathan Scott Johnson & Yue Jiang & Rui Ning & Apurva Mehta & Samira Siahrostami & Xiaolin Zheng, 2022. "Discovery of LaAlO3 as an efficient catalyst for two-electron water electrolysis towards hydrogen peroxide," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34884-4
    DOI: 10.1038/s41467-022-34884-4
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    References listed on IDEAS

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