| Literature DB >> 33891414 |
Yunzhou Wen1, Peining Chen1,2, Lu Wang3,4, Shangyu Li1, Ziyun Wang2, Jehad Abed2,5, Xinnan Mao3, Yimeng Min2, Cao Thang Dinh6, Phil De Luna2, Rui Huang1, Longsheng Zhang1, Lie Wang1, Liping Wang1, Robert J Nielsen4, Huihui Li2, Taotao Zhuang2, Changchun Ke7, Oleksandr Voznyy2, Yongfeng Hu8, Youyong Li3, William A Goddard Iii4, Bo Zhang1, Huisheng Peng1, Edward H Sargent2.
Abstract
In hydrogen production, the anodic oxygen evolution reaction (OER) limits the energy conversion efficiency and also impacts stability in proton-exchange membrane water electrolyzers. Widely used Ir-based catalysts suffer from insufficient activity, while more active Ru-based catalysts tend to dissolve under OER conditions. This has been associated with the participation of lattice oxygen (lattice oxygen oxidation mechanism (LOM)), which may lead to the collapse of the crystal structure and accelerate the leaching of active Ru species, leading to low operating stability. Here we develop Sr-Ru-Ir ternary oxide electrocatalysts that achieve high OER activity and stability in acidic electrolyte. The catalysts achieve an overpotential of 190 mV at 10 mA cm-2 and the overpotential remains below 225 mV following 1,500 h of operation. X-ray absorption spectroscopy and 18O isotope-labeled online mass spectroscopy studies reveal that the participation of lattice oxygen during OER was suppressed by interactions in the Ru-O-Ir local structure, offering a picture of how stability was improved. The electronic structure of active Ru sites was modulated by Sr and Ir, optimizing the binding energetics of OER oxo-intermediates.Entities:
Year: 2021 PMID： 33891414 DOI： 10.1021/jacs.1c00384
Source DB: PubMed Journal: J Am Chem Soc ISSN： 0002-7863 Impact factor: 15.419