Effect
of Catalytically Silent Cerium Hydroxide in
Cobalt–Cerium Mixed Double Hydroxide for Enhanced Water Oxidation
Kinetics in a BiVO<sub>4</sub> Photoanode
Tushar
Kanta Sahu
Suhaib Alam
Devipriya Gogoi
Nageswara Rao Peela
Mohammad Qureshi
10.1021/acsaem.0c00551.s001
https://acs.figshare.com/articles/journal_contribution/Effect_of_Catalytically_Silent_Cerium_Hydroxide_in_Cobalt_Cerium_Mixed_Double_Hydroxide_for_Enhanced_Water_Oxidation_Kinetics_in_a_BiVO_sub_4_sub_Photoanode/12361016
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.
2020-05-22 22:29:23
cobalt
stability
Catalytically Silent Cerium Hydroxide
oxygen evolution cocatalysts
BiVO 4 Photoanode
water oxidation performance
metal hydroxide
cerium
Enhanced Water Oxidation Kinetics
Co
BiVO 4
BiVO 4 photoanode
onset cathodic shift
surface oxidation kinetics