Activity and stability trends of perovskite oxides for oxygen evolution catalysis at neutral pH
Author(s)Ling, Chen; Jia, Hongfei; Han, Binghong; Risch, Marcel; Lee, Yueh Lin; Shao-Horn, Yang; ... Show more Show less
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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.
DepartmentMassachusetts 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
Phys. Chem. Chem. Phys.
Royal Society of Chemistry, The
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.
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