武汉理工大学余火根团队报道了富羟基水合二氧化锡涂层BiVO₄提高光催化H₂O₂产量提高。相关研究成果于2024年10月31日发表在《结构化学》。

无机光催化剂（BiVO₄）表面H₂O₂的快速分解和水质子供应不足，导致H₂O₂的光合产量低。

该文中，在BiVO₄表面涂覆了具有大量羟基的含水二氧化锡（HSnO），通过同时提供足够的质子和抑制H₂O₂分解，大大提高了光催化H₂O₂的活性。在涂覆HSnO后，作为O₂还原活性位点的Au纳米粒子被选择性地沉积在BiVO₄的（010）面上，以合成Au/BiVO₄@HSnO光催化剂。

由此产生的Au/BiVO₄@HSnO光催化剂表现出优异的H₂O₂生产性能，其中在纯水中光照2小时后，光生H₂O₂浓度（210.7μmol L^-1）约为Au/BiVO₄的4.8倍。优异的光催化性能可归因于HSnO涂层同时增强了H₂O₂的产生并抑制了H₂O₂的分解。

具体来说，带有大量羟基的HSnO涂层提供了足够的质子，以促进O₂在Au纳米颗粒上催化转化为H₂O₂。更重要的是，HSnO涂层不仅使黄斑水有效渗透到BiVO₄表面进行快速氧化反应，而且通过降低其与BiVO₄的亲和力，大大抑制了H₂O₂分解的逆反应。

该项研究为通过表面涂层策略，促进光催化H₂O₂的产生提供了新的见解。

附：英文原文

Title: Hydroxyl-enriched hydrous tin dioxide-coated BiVO4 with boosted photocatalytic H2O2 production

Author: Sikai Wu, Xuefei Wang, Huogen Yu

Issue&Volume: 2024-10-31

Abstract: The rapid decomposition of H2O2 on the surface of inorganic photocatalyst (BiVO4) and insufficient proton supply from water leads to a low photosynthetic yield of H2O2. Herein, hydrous tin dioxide (HSnO) with massive hydroxyl groups was coated on the BiVO4 surface to greatly improve the photocatalytic H2O2 activity via simultaneous realization of providing sufficient protons and inhibiting H2O2 decomposition. After the coating of HSnO, Au nanoparticles as the O2-reduction active sites were selectively deposited on the (010) facet of BiVO4 to synthesize the Au/BiVO4@HSnO photocatalyst. The resulting Au/BiVO4@HSnO photocatalyst exhibits excellent H2O2-production performance, in which the photogenerated H2O2 concentration (210.7 μmol L1) is about 4.8 times higher than that of the Au/BiVO4 after 2 hour light irradiation in pure water. The outstanding photocatalytic performance can be attributed to simultaneous enhancement of H2O2 generation and the suppression of H2O2 decomposition by HSnO coating. Specifically, the HSnO coating with massive hydroxyl groups provides enough protons to promote the catalytic transformation of O2 into H2O2 on Au nanoparticles. More importantly, the HSnO coating not only allows water macular to effectively permeate onto BiVO4 surface for rapid oxidation reaction, but also greatly inhibits the reverse reaction of H2O2 decomposition via decreasing its affinity with BiVO4 surface. This research offers new insights for boosting photocatalytic H2O2 production through surface coating strategy.

DOI: 10.1016/j.cjsc.2024.100457

Source: http://cjsc.ac.cn/cms/issues/722