Strengthening Bonding Interaction of a (Co<sub>0.91</sub>V<sub>0.09</sub>)<sub>3</sub>(BTC)<sub>2</sub> Metal-Organic Framework with BiVO<sub>4</sub> Photoanodes Enabling Ultrastable Photoelectrochemical Water Oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 40243226.
- Also identified by DOI 10.1021/acsnano.5c01111.
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Abstract
Although the oxygen evolution reaction (OER) activity of BiVO<sub>4</sub> photoanodes has been significantly enhanced, achieving long-term photostability is still challenging due to the gradual dissolution of V<sup>5+</sup> during photoelectrochemical (PEC) water splitting. Herein, we deliberately generate ligand defects in a (Co<sub>0.91</sub>V<sub>0.09</sub>)<sub>3</sub>(BTC)<sub>2</sub> metal-organic framework (CoV-MOF) that creates more undercoordinated sites, forming strong chemical bonds with BiVO<sub>4</sub>. Consequently, the dissolution of V<sup>5+</sup> from BiVO<sub>4</sub> during PEC water splitting can be effectively suppressed, leading to significantly enhanced stability. The optimized Co<sub>3</sub>O<sub>4</sub>/CoV-MOF/BiVO<sub>4</sub> photoanode exhibits a high photocurrent density of 6.0 mA cm<sup>-2</sup> at 1.23 V vs the reversible hydrogen electrode (RHE). Impressively, the photoanode can stably operate for 500 h at 0.6 V vs RHE under AM 1.5 G illumination. This work demonstrates the proof-of-concept of anchoring V<sup>5+</sup> in BiVO<sub>4</sub> photoanodes achieving ultrastable PEC water splitting.