Effect of Catalytically Silent Cerium Hydroxide in Cobalt–Cerium Mixed Double Hydroxide for Enhanced Water Oxidation Kinetics in a BiVO<sub>4</sub> Photoanode

Published on 2020-05-22T22:29:24Z (GMT) by
Coupling of the BiVO<sub>4</sub> photoanode and a mixed metal hydroxide having cobalt and cerium yielded a photo current density of 3.74 mA/cm<sup>2</sup> with an onset cathodic shift of ∼370 mV, resulting in an impressive solar-to-hydrogen efficacy of 4.3%. The addition of catalytically silent cerium to Co­(OH)<i><sub>x</sub></i> not only enhanced the stability but also improved charge injection and surface oxidation kinetics. The water oxidation performance of BiVO<sub>4</sub>-CoCe­(OH)<i><sub>x</sub></i> could be attributed to the synergistic effect of both cobalt and cerium, where cerium incorporation enhanced the surface passivation, aiding the stability of the photoanode and formation of Co­(II)/(III) active sites to fasten the surface kinetics of BiVO<sub>4</sub>. An average Faradaic yield of ∼94% suggests that majority of the holes have been utilized for water oxidation. We believe that the present design of the BiVO<sub>4</sub> photoanode with mixed metal hydroxide provides a promising and efficient strategy for modification of a photoanode with stable and highly active oxygen evolution cocatalysts.

Cite this collection

Sahu, Tushar

Kanta; Alam, Suhaib; Gogoi, Devipriya; Peela, Nageswara Rao; Qureshi, Mohammad (2020): Effect

of Catalytically Silent Cerium Hydroxide in

Cobalt–Cerium Mixed Double Hydroxide for Enhanced Water Oxidation

Kinetics in a BiVO4 Photoanode. ACS Publications. Collection. https://doi.org/10.1021/acsaem.0c00551