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H2O2 Treated La0.8Sr0.2CoO3-δ as an Efficient Catalyst for Oxygen Evolution Reaction

Authors Lam, Kwunyu HKUST affiliated (currently or previously)
Gao, Yang HKUST affiliated (currently or previously)
Wang, Jian HKUST affiliated (currently or previously)
Ciucci, Francesco View this author's profile
Issue Date 2017
Source Electrochimica Acta , v. 244, August 2017, p. 139-145
Summary The development of non-precious metal-based oxygen evolution reaction (OER) electrocatalysts is one of the keys to lower the cost of various renewable energy technologies including fuel cells, water electrolyzers, and metal-air batteries. Perovskite oxides are among the best catalysts for OER in alkaline solutions. In the perovskite family, La0.8Sr0.2CoO3-δ (LSC) has been reported to have OER catalytic properties dependent on the characteristics of its surface, but where its activity and stability are still not high enough for applications. In order to improve the surface catalysis of LSC, we have subjected it to multiple H2O2 treatments. After 4 treatments, lasting 6 hours each, the current density of LSC at 1.70 V (vs RHE) increased by a factor of 6.6 and concomitantly, the Tafel slope decreased from 105.5 to 76.6 mVdec−1 compared to untreated materials. The long-term stability also improved dramatically after treatment. All these improvements are likely linked to the formation of an amorphous layer of hydrous oxide on the LSC particles during treatment. © 2017 Elsevier Ltd
ISSN 0013-4686
Language English
Format Article
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