Abstract
Photoelectrochemical (PEC) devices could play a significant role in efficient solar-to-fuel production for a sustainable economy. Herein, we report a significant enhancement of PEC water splitting via rational tailoring of ferromagnetic ordered oxygen evolution cocatalysts (OECs) iron-cobalt oxide on the Mo-doped BiVO4 (Mo:BiVO4) surface. The Fe3+ and Co2+ tend to form an optimal electron-filled arrangement, contributing to lower barriers for the oxygen evolution reaction (OER). Benefiting from the Fe/Co dual-site as the catalytic center, the prepared FeCoOx/Mo:BiVO4 photoanode achieves 4.55 mA·cm−2 at 1.23 V vs reversible hydrogen electrode (RHE) with a lower starting potential for OER, outperforming the FeOx/Mo:BiVO4 (2.71 mA·cm−2) and CoOx/Mo:BiVO4 (3.48 mA·cm−2). Importantly, ferromagnetic iron-cobalt oxide as the spin polarizer can optimize the OER kinetics. Under spin-related effects, a magnetic stimulation strategy can further enhance the spin alignment. The corresponding photocurrent of FeCoOx/Mo:BiVO4 is increased up to 5.15 mA·cm−2 under a magnetic field, with ηSep and ηTrans reaching 89 % and 91 %, respectively. Specifically, the spin-polarization process will be helpful for the production of O(↓)O(↓)H intermediates, preferring to produce O2. Hence, this study provides a new pathway for designing highly efficient PEC water splitting systems on magnetic-assisted photoelectrodes.
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