Sodium borohydride-assisted synthesis of strontium substituted lanthanum cobaltate with in-situ generated cobaltosic oxide: Towards enhanced oxygen evolution reaction in alkaline media.

Author(s) Liu, H.; Tan, P.; Ma, Q.; Dong, R.; Zhu, A.; Qiao, L.; Tang, M.; Li, E.; Pan, J.
Journal J Colloid Interface Sci
Date Published 2019 Sep 07

Based on the intrinsic behaviour of doped Co-based perovskite to generate the second phase of CoO, a novel strategy was developed to synthesize a hybrid catalyst consisting of LaSrCoO (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) and in-situ generated CoO in the presence of NaBH. When x increased to 1.0, a well-designed integration (SrCoO@CoO) was obtained which displayed the optimal OER activity with an overpotential of 330 mV at 10 mA cm, a small Tafel slope of 66.7 mV dec and terrific durability in alkaline media. This excellent performance can be attributed to the auxiliary of the in-situ generated CoO for SrCoO which modifies the chemical states of Co cations, compensates for the unsatisfactory electrical conductivity of SrCoO while preserves oxygen vacancies, boosts the content of lattice oxygen and exposes more active sites. This work is expected to provide a new mind to design effective electrocatalysts towards water splitting.

DOI 10.1016/j.jcis.2019.09.023
ISSN 1095-7103
Citation J Colloid Interface Sci. 2019;557:103111.

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