Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes

Sen Jin, Xiaoxue Ma, Jing Pan, Chongyang Zhu, Sandra Elizabeth Saji, Jingguo Hu, Xiaoyong Xu*, Litao Sun, Zongyou Yin

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    131 Citations (Scopus)

    Abstract

    The sluggish catalytic reactivity on the surface of most semiconductors is a common obstacle in developing photo-electrochemical (PEC) electrodes. Loading cocatalysts becomes a plausible scenario but remains challenging in the integration with semiconductors due to the complicated interfacial issues. This work introduces an feasible strategy of activating surface reactivity, alternative to cocatalysis, in cooperating with semiconductor photoactivity to boost PEC performance. We apply an ionized argon plasma technology on three-dimensional (3D) nanoporous BiVO4 (BVO) to controllably generate surface oxygen vacancies, which enable surface activation favoring charge separation and transfer towards water oxidation reaction (WOR). A remarkable photocurrent density of 4.32 mA cm−2 is achieved at 1.23 V versus reversible hydrogen electrode (RHE) under AM 1.5 G illumination, which is a record among the reported single BVO photoanodes and even surpasses the performances of most cocatalyst-assisted ones. This study provides an alternative solution to sluggish catalytic kinetics on semiconductor photoelectrodes, thus paving a novel avenue to modulate cooperation with photoactivity in PEC technology.

    Original languageEnglish
    Article number119477
    JournalApplied Catalysis B: Environmental
    Volume281
    DOIs
    Publication statusPublished - Feb 2021

    Fingerprint

    Dive into the research topics of 'Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes'. Together they form a unique fingerprint.

    Cite this