Strengthening Bonding Interaction of a (Co0.91V0.09)3(BTC)2 Metal–Organic Framework with BiVO4 Photoanodes Enabling Ultrastable Photoelectrochemical Water Oxidation

IF 15.8 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Nano Pub Date : 2025-04-17 DOI:10.1021/acsnano.5c01111

Liangcheng Xu, Yingjuan Zhang, Boyan Liu, Kang Wan, Xin Wang, Tingsheng Wang, Lianzhou Wang, Songcan Wang, Wei Huang

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Abstract

Although the oxygen evolution reaction (OER) activity of BiVO₄ photoanodes has been significantly enhanced, achieving long-term photostability is still challenging due to the gradual dissolution of V⁵⁺ during photoelectrochemical (PEC) water splitting. Herein, we deliberately generate ligand defects in a (Co_0.91V_0.09)₃(BTC)₂ metal–organic framework (CoV-MOF) that creates more undercoordinated sites, forming strong chemical bonds with BiVO₄. Consequently, the dissolution of V⁵⁺ from BiVO₄ during PEC water splitting can be effectively suppressed, leading to significantly enhanced stability. The optimized Co₃O₄/CoV-MOF/BiVO₄ photoanode exhibits a high photocurrent density of 6.0 mA cm^–2 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 V⁵⁺ in BiVO₄ photoanodes achieving ultrastable PEC water splitting.

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（Co0.91V0.09）3(BTC)2金属有机骨架与BiVO4光阳极强化键合作用，实现超稳定的光电化学水氧化

尽管BiVO4光阳极的析氧反应（OER）活性显著增强，但由于V5+在光电化学（PEC）水分解过程中逐渐溶解，实现长期光稳定性仍然具有挑战性。在此，我们故意在（Co0.91V0.09）3(BTC)2金属-有机框架（CoV-MOF）中产生配体缺陷，从而产生更多的欠协调位点，与BiVO4形成强化学键。因此，在PEC水裂解过程中，可以有效抑制BiVO4中V5+的溶解，从而显著提高稳定性。与可逆氢电极（RHE）相比，优化后的Co3O4/CoV-MOF/BiVO4光阳极在1.23 V时具有6.0 mA cm-2的高光电流密度。令人印象深刻的是，光阳极可以在0.6 V vs RHE下在AM 1.5 G照明下稳定工作500小时。这项工作证明了锚定V5+在BiVO4光阳极中实现超稳定PEC水分解的概念验证。

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来源期刊

ACS Nano 工程技术-材料科学：综合

CiteScore

26.00

自引率

4.10%

发文量

1627

审稿时长

1.7 months

期刊介绍： ACS Nano, published monthly, serves as an international forum for comprehensive articles on nanoscience and nanotechnology research at the intersections of chemistry, biology, materials science, physics, and engineering. The journal fosters communication among scientists in these communities, facilitating collaboration, new research opportunities, and advancements through discoveries. ACS Nano covers synthesis, assembly, characterization, theory, and simulation of nanostructures, nanobiotechnology, nanofabrication, methods and tools for nanoscience and nanotechnology, and self- and directed-assembly. Alongside original research articles, it offers thorough reviews, perspectives on cutting-edge research, and discussions envisioning the future of nanoscience and nanotechnology.