Electron-transfer dynamics and photocatalytic H2-production activity of PbS@Cu2S nanocomposites

IF 5.5 3区工程技术 Q1 ENGINEERING, CHEMICAL Journal of the Taiwan Institute of Chemical Engineers Pub Date : 2024-06-03 DOI:10.1016/j.jtice.2024.105587

Chi-Jung Chang , Shao-Ching Hsieh , Jemkun Chen , Yi-Ching Wang , Chao-Lung Chiang , Yan-Gu Lin

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Abstract

Background

Lead citrate is a precursor that can be prepared by recycling the spent lead paste of lead-acid batteries. Lead citrate is used to synthesize lead oxide, which can be repeatedly utilized for the lead-acid battery application.

Methods

We report a new application of lead citrate precursor to synthesize PbS@Cu₂S nanomaterials for photocatalytic H₂ production. PbS@Cu₂S was prepared by microwave-assisted hydrothermal and ion-exchange processes. The electron-transfer dynamics and H₂-production activity of PbS@Cu₂S photocatalysts were studied.

Significant findings

A S-scheme heterojunction is proposed based on the results of Tauc plots, ultraviolet photoelectron spectroscopy, the electron paramagnetic resonance scavenger test, and in situ near-edge X-ray absorption fine structure (NEXAFS) analysis. Results of in situ NEXAFS reveal the transfer of photoexcited electrons from PbS to Cu₂S. By loading an optimized amount of Cu₂S, the carrier separation and photocatalytic activity of PbS@Cu₂S photocatalysts are improved. This technology can transform the lead citrate precursor to the PbS@Cu₂S photocatalyst with excellent high H₂ production activity (3824 μmol g⁻¹ h⁻¹).

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PbS@Cu2S 纳米复合材料的电子传递动力学和光催化产生 H2 的活性

背景柠檬酸铅是一种前驱体，可通过回收铅酸蓄电池的废铅膏制备。柠檬酸铅可用于合成氧化铅，而氧化铅可重复用于铅酸蓄电池。PbS@Cu2S 是通过微波辅助水热法和离子交换法制备的。根据陶克图、紫外光电子能谱、电子顺磁共振清扫试验和原位近边 X 射线吸收精细结构（NEXAFS）分析的结果，提出了一种 S 型异质结。原位近边 X 射线吸收精细结构分析的结果表明，光激发电子从 PbS 转移到了 Cu2S。通过负载优化量的 Cu2S，PbS@Cu2S 光催化剂的载流子分离和光催化活性得到了改善。该技术可将柠檬酸铅前驱体转化为 PbS@Cu2S 光催化剂，其 H2 生成活性极高（3824 μmol g-1 h-1）。

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来源期刊

Journal of the Taiwan Institute of Chemical Engineers 工程技术-工程：化工

CiteScore

9.10

自引率

14.00%

发文量

362

审稿时长

35 days

期刊介绍： Journal of the Taiwan Institute of Chemical Engineers (formerly known as Journal of the Chinese Institute of Chemical Engineers) publishes original works, from fundamental principles to practical applications, in the broad field of chemical engineering with special focus on three aspects: Chemical and Biomolecular Science and Technology, Energy and Environmental Science and Technology, and Materials Science and Technology. Authors should choose for their manuscript an appropriate aspect section and a few related classifications when submitting to the journal online.