Boosting H2S conversion with S-scheme Cd0.5Zn0.5S/TiO2 nanotube arrays photoanode

IF 10.5 4区化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR

结构化学 Pub Date : 2026-08-01 Epub Date: 2026-04-22 DOI:10.1016/j.cjsc.2026.100961

Wenqi Wang, Xiajie Zhang, Ting Gao, Lin Ju, Dongqiu Zhao, Enzhou Liu

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Abstract

The development of mild, environmentally-friendly, and low-energy hydrogen sulfide (H₂S) conversion technologies is critical for energy and environmental sustainability. Herein, a cadmium zinc sulfide/titanium dioxide (Cd_0.5Zn_0.5S/TiO₂) heterojunction photoanode was fabricated via hydrothermal deposition of Cd_0.5Zn_0.5S nanoparticles on TiO₂ nanotube arrays, Subsequently, it was integrated with an iodide ion/triiodide ion (I⁻/I₃⁻) redox-mediated system to construct a photoelectrocatalytic (PEC) platform for resource utilization of H₂S. At an applied bias of 1.8 V, the Cd_0.5Zn_0.5S/TiO₂ heterojunction achieved a photocurrent density of 1.9 mA·cm⁻², which was 5.7 times that of pure TiO₂. Moreover, it maintained a stable photocurrent density of 0.98 mA·cm⁻² at 0.6 V. Mechanistic analyses indicated that the staggered band structure of the heterojunction enhanced photogenerated carrier separation, while the I⁻/I₃⁻ cycle enabled selective oxidation of H₂S to elemental sulfur (S⁰), thereby preventing the formation of polysulfides and the passivation of the photoanode. A single 5 h PEC cycle yielded 25 mL of H₂ and recoverable sulfur, realizing synchronous hydrogen (H₂) production and H₂S detoxification without the need for complex separation steps. This research offers a novel material design strategy for high-performance PEC-H₂S conversion systems and provides technical insights for green valorization of sulfide pollutants.

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s方案Cd0.5Zn0.5S/TiO2纳米管阵列光阳极提高H2S转化率

开发温和、环保、低能耗的硫化氢（H2S）转化技术对能源和环境的可持续性至关重要。本文通过水热沉积Cd0.5Zn0.5S纳米颗粒在TiO2纳米管阵列上制备了硫化镉锌/二氧化钛（Cd0.5Zn0.5S/TiO2）异质结光阳极，并将其与碘离子/三碘离子（I−/I3−）氧化还原介导体系集成，构建了H2S资源利用的光电催化（PEC）平台。在施加偏置为1.8 V时，Cd0.5Zn0.5S/TiO2异质结的光电流密度为1.9 mA·cm−2，是纯TiO2的5.7倍。此外，在0.6 V下，它保持了0.98 mA·cm−2的稳定光电流密度。机制分析表明，异质结的交错带结构增强了光生载流子分离，而I−/I3−循环使H2S选择性氧化为单质硫（S0），从而防止了多硫化物的形成和光阳极的钝化。单个5 h的PEC循环产生25 mL的H2和可回收的硫，实现同步氢气（H2）生产和H2S脱毒，而无需复杂的分离步骤。该研究为高性能PEC-H2S转化系统提供了一种新的材料设计策略，并为硫化物污染物的绿色增值提供了技术见解。

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来源期刊

结构化学化学-晶体学

CiteScore

4.70

自引率

22.70%

发文量

5334

审稿时长

13 days

期刊介绍： Chinese Journal of Structural Chemistry “JIEGOU HUAXUE ”, an academic journal consisting of reviews, articles, communications and notes, provides a forum for the reporting and discussion of current novel research achievements in the fields of structural chemistry, crystallography, spectroscopy, quantum chemistry, pharmaceutical chemistry, biochemistry, material science, etc. Structural Chemistry has been indexed by SCI, CA, and some other prestigious publications.