Activity and stability trends of perovskite oxides for oxygen evolution catalysis at neutral pH
Name
Activity and stability with SI.pdf
Size
11.07 MB
Format
Adobe PDF
Checksum (MD5)
e373a3a8f69752e0a3b8624a6d2f4582
Author(s)
Ling, Chen
Jia, Hongfei
Han, Binghong
Risch, Marcel
Lee, Yueh Lin
Shao-Horn, Yang
Date Issued
August 2015
Journal
Phys. Chem. Chem. Phys.
Publisher
Royal Society of Chemistry, The
Citation
Han, Binghong, Marcel Risch, Yueh-Lin Lee, Chen Ling, Hongfei Jia, and Yang Shao-Horn. “Activity and Stability Trends of Perovskite Oxides for Oxygen Evolution Catalysis at Neutral pH.” Phys. Chem. Chem. Phys. 17, no. 35 (2015): 22576–22580.
Version
Author's final manuscript
Abstract
Perovskite oxides (ABO[subscript 3]) have been studied extensively to promote the kinetics of the oxygen evolution reaction (OER) in alkaline electrolytes. However, developing highly active catalysts for OER at near-neutral pH is desirable for many photoelectrochemical/electrochemical devices. In this paper, we systematically studied the activity and stability of well-known perovskite oxides for OER at pH 7. Previous activity descriptors established for perovskite oxides at pH 13, such as having an e[subscript g] occupancy close to unity or having an O p-band center close to Fermi level, were shown to scale with OER activity at pH 7. Stability was a greater challenge at pH 7 than at pH 13, where two different modes of instability were identified from combined transmission electron microscopy and density functional theory analyses. Perovskites with O p-band close to Fermi level showed leaching of A-site atoms and surface amorphization under all overpotentials examined at pH 7, while those with O p-band far from Fermi level were stable under low OER current/potential but became unstable at high current/potential accompanied by leaching of B-site atoms. Therefore, efforts are needed to enhance the activity and stability of perovskites against A-site or B-site loss if used at neutral pH.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
Massachusetts Institute of Technology. Department of Mechanical Engineering
Massachusetts Institute of Technology. Electrochemical Energy Laboratory
Massachusetts Institute of Technology. Research Laboratory of Electronics
Terms of Use
Creative Commons Attribution-Noncommercial-Share Alike
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1039/c5cp04248h
