Journal
CHEMICAL ENGINEERING JOURNAL
Volume 427, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.131004
Keywords
BiVO4; Photoelectrochemical water oxidation; Metal-organic complex; Cocatalyst
Categories
Funding
- National Natural Science Foundation of China [51772249, 51821091]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2021059, CX2021011]
- Fundamental Research Funds for the Central Universities [3102019JC005]
- National Natural Science Foundation [2019JLM-26]
- Post-doctoral Program of Shaanxi Province [2018BSHTDZZ16]
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By utilizing a superhydrophilic metal-organic complex coating, the PEC performance of BiVO4 photoanodes can be significantly improved, leading to enhanced activity and stability.
The core challenge of BiVO4 photoanodes toward water oxidation originates from their poor photoelectrochemical (PEC) kinetics and stability. Herein, we report a novel superhydrophilic metal-organic complex coating to show a significant improvement in the PEC performance of BiVO4 photoanodes. The in situ coordination of phytic acid (PA) molecules with metal ions enables uniform deposition of superhydrophilic CoFe-PA complex on the BiVO4 scaffold. The CoFe-PA could serve as an excellent cocatalyst coating to promote the surface hole transfer kinetics and armor the structural integrity of BiVO4, thus remarkably promoting the PEC activity and stability. As a result, the CoFe-PA modified BiVO photoelectrode exhibits a photocurrent density as high as 4.5 mA cm(-2) at 1.23 V vs. RHE, which is triple of the bare counterpart. Additionally, the hybrid photoanode manifests a more negative onset potential of ca. 0.24 V vs. RHE and remarkably enhanced stability. This work will provide a fresh impetus of developing metal-organic complex films toward efficient PEC water oxidation.
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