Mo-doped ZnV2O6/reduced graphene oxide photoanodes for solar hydrogen production

نویسندگان

چکیده

Abstract We report the fabrication and characterization of molybdenum (Mo)-doped ZnV2O6/reduced graphene oxide (rGO) composite its use as photoanode for photoelectrochemical (PEC) hydrogen production. Compared to pure ZnV2O6, Mo ions act electron donor in ZnV2O6:Mo lattice increasing charge carrier concentration subsequently mobility bulk by polaron transport. measured hole transfer efficiency Mo-doped ZnV2O6 electrodes revealing a substantial increase from 16 25%. The mechanism enhanced photoactivity was studied density functional theory calculations. Moreover, electrochemical impedance spectroscopy measurements show that modification improves separation across electrode/electrolyte interface. Therefore, combination two strategies triggers synergistic enhancement PEC performance terms incident photon-to-current efficiency, which is 17% at 370 nm, being 4.5- 3.6-times greater than those pristine photoanodes, respectively. With photocurrent onset potentials 0.6 V densities 2.07 mA/cm2 1.23 V vs. RHE, ZnV2O6:Mo/rGO photoanodes are interest design high visible-light-induced water-splitting devices.

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ژورنال

عنوان ژورنال: Electrochimica Acta

سال: 2021

ISSN: ['1873-3859', '0013-4686']

DOI: https://doi.org/10.1016/j.electacta.2021.138333