盐酸后处理制备高效制氢光催化剂Zn2In2S5

doi:10.7503/cjcu20200023

摘要/Abstract

摘要：

采用水热法制备了ZnIn₂S₄固溶体, 并通过用盐酸对其进行后处理获得了系列Zn_mIn₂S_m₊₃(m≥2, 整数)固溶体. 通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、 X射线光电子能谱(XPS)、紫外-可见漫反射光谱(UV-Vis DRS)、荧光光谱(PL)和电化学测试对催化剂的组成、结构和性能进行了表征. 研究了系列固溶体可见光光催化制氢活性. 结果表明, ZnIn₂S₄固溶体经0.5 mol/L HCl处理后能转化为Zn₂In₂S₅固溶体, 其制氢活性为ZnIn₂S₄固溶体的2.2倍, 并且具有良好的稳定性.

关键词: Zn_mIn₂S_m₊₃固溶体, 氢气, 盐酸后处理, 光催化

Abstract:

ZnIn₂S₄ solid solutions were prepared by hydrothermal method and a series of Zn_mIn₂S_m₊₃(m=1—5, integer) solid solutions were obtained by post-treatment of ZnIn₂S₄ with HCl. The composition, structure and performance of the catalysts were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray photoelectron spectroscopy(XPS), UV-Visible diffuse reflective spectroscopy(UV-Vis DRS), photoluminescence(PL) spectroscopy and electrochemical tests. The visible light photocatalytic hydrogen production activity of a series of solid solutions was studied. It is found that ZnIn₂S₄ solid solution can be converted into Zn₂In₂S₅ solid solution after treatment with 0.5 mol/L HCl, and its hydrogen production activity is the highest, which is 2.2 times that of ZnIn₂S₄ solid solution. The catalyst also has good stability.

Key words: Zn_mIn₂S_m₊₃ solid solution, Hydrogen, HCl post-treatment, Photocatalysis

中图分类号:

O643

TrendMD:

彭绍琴, 李紫琴, 黄铭涛, 李越湘. 盐酸后处理制备高效制氢光催化剂Zn₂In₂S₅. 高等学校化学学报, 2020, 41(7): 1677.

PENG Shaoqin, LI Ziqin, HUANG Mingtao, LI Yuexiang. Preparation of Zn₂In₂S₅ Photocatalyst by Post-treatment with Hydrochloric Acid for Effective Photocatalytic Hydrogen Evolution^†. Chem. J. Chinese Universities, 2020, 41(7): 1677.

图/表 9

Fig.1 XRD patterns of ZIS and ZIS-x samples

Table 1 Properties of ZIS and ZIS-x solid solutions*

Sample	D/nm	S_BET/(m²·g^-1)	n_Zn:n_In:n_S	E_g/eV
ZIS	9.36	143.2	1:1.9:3.7	2.33
ZIS-0.25	9.37	131.2	—	2.34
ZIS-0.5	10.14	114.1	1:1.1:2.6	2.36
ZIS-0.75	11.13	88.7	—	2.39
ZIS-1.0	12.17	66.2	1:0.36:1.5	2.42

Fig.2 SEM images(A1—C1, A2—C2) and corresponding EDX(spectra A3—C3) of ZIS(A1—A3), ZIS-0.5(B1—B3) and ZIS-1.0(C1—C3)

Fig.3 TEM image of ZIS-0.5(A) and HRTEM images of zones Ⅰ(B), Ⅱ(C) and Ⅲ(D) in (A)

Fig.4 XPS survey spectra(A) and high-resolution spectra for Zn2p(B), In3d(C) and S2p(D) of ZIS(a) and ZIS-0.5(b) solid solutions

Fig.5 UV-Vis diffuse reflectance spectra for ZIS and ZIS-x Inset is plots of (αhν)2 against photon energy (hν) for ZIS and ZIS-x.

Fig.6 Comparison of photocatalytic hydrogen production activity(A) and quantum efficiency at 420 nm for ZIS and ZIS-0.5 catalysts(B)

Fig.7 Curves of transient photocurrent vs. irradiation time under visible light(A) and fluorescence spectra(B) for ZIS-0.5(a), ZIS(b) and ZIS-1.0(c) solid solutions

Fig.8 Hydrogen production stability(A) and XRD comparison before and after reaction(B) for ZIS-0.5 solid solution

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盐酸后处理制备高效制氢光催化剂Zn₂In₂S₅

Preparation of Zn₂In₂S₅ Photocatalyst by Post-treatment with Hydrochloric Acid for Effective Photocatalytic Hydrogen Evolution^†

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