Chinese Journal of Catalysis ›› 2020, Vol. 41 ›› Issue (11): 1692-1697.DOI: 10.1016/S1872-2067(20)63628-2

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Lanthanide-regulated oxygen evolution activity of face-sharing IrO6 dimers in 6H-perovskite electrocatalysts

Weiqiang Feng, Hui Chen, Qi Zhang, Ruiqin Gao, Xiaoxin Zou   

  1. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, Jilin, China
  • Received:2020-02-28 Revised:2020-03-31 Online:2020-11-18 Published:2020-08-15
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (21771079, 21621001), Fok Ying Tung Education Foundation (161011), the Postdoctoral Innovative Talent Support Program (BX20180120) and the China Postdoctoral Science Foundation (2018M641771), and the 111 Project (B17020).

Abstract: The development of efficient oxygen evolution electrocatalysts with reduced noble metal uses is a critical challenge for the deployment of various advanced energy conversion technologies. Here, a series of lanthanide-contained 6H-perovskites with a formula of Ba3LnIr2O9 (Ln=lanthanides) are investigated as oxygen evolution electrocatalysts, whose active subunits (i.e., face-sharing IrO6 dimers) can be regulated by the lanthanides in terms of catalytic activity. By using density functional theory (DFT) calculations, we establish the theoretical trend in activity for Ba3LnIr2O9 6H-perovskites, the activity of which is correlated with the difference of adsorption free energy (△GO-△GOH) between O* and OH* reaction intermediates. We further establish a volcano curve between △GO-△GOH and the calculated O p-band center. Among the Ba3LnIr2O9 6H-perovskites, Ba3LaIr2O9 locates at the peak of volcano curve, and correspondingly is the most active electrocatalyst due to the optimal O p-band property.

Key words: Lanthanide, Perovskite, Oxygen evolution reaction, O p-band center, Electrocatalyst