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CeO2/CdxZn1-xS光催化剂的制备及其可见光催化产氢性能

胡雅楠 刘洁 徐凯旋 袁中强 高晓明

胡雅楠, 刘洁, 徐凯旋, 等. CeO2/CdxZn1-xS光催化剂的制备及其可见光催化产氢性能[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 胡雅楠, 刘洁, 徐凯旋, 等. CeO2/CdxZn1-xS光催化剂的制备及其可见光催化产氢性能[J]. 复合材料学报, 2024, 42(0): 1-10.
HU Yanan, LIU Jie, XU Kaixuan, et al. Preparation of CeO2/CdxZn1-xS Photocatalyst and its High-Performance Photocatalytic Hydrogen Production[J]. Acta Materiae Compositae Sinica.
Citation: HU Yanan, LIU Jie, XU Kaixuan, et al. Preparation of CeO2/CdxZn1-xS Photocatalyst and its High-Performance Photocatalytic Hydrogen Production[J]. Acta Materiae Compositae Sinica.

CeO2/CdxZn1-xS光催化剂的制备及其可见光催化产氢性能

基金项目: 国家自然科学基金 (22369022);陕西省创新能力支撑计划项目 (2024RS-CXTD-36);陕西省技术创新引导计划项目(2022QFY07-03)
详细信息
    通讯作者:

    高晓明,博士,教授,硕士生导师,研究方向为多相催化 E-mail: dawn1026@163.com

  • 中图分类号: X75; TB333

Preparation of CeO2/CdxZn1-xS Photocatalyst and its High-Performance Photocatalytic Hydrogen Production

Funds: National Natural Science Foundation of China (No. 22369022); Project of Innovation Capability Support Program of Shaanxi Province(No. 2024RS-CXTD-36); Technology Innovation Leading Program of Shaanxi (2022QFY07-03)
  • 摘要: 采用溶剂热法制备了CdxZn1-xS固溶体、CeO2/CdxZn1-xS异质结,并利用XRD、SEM、XPS等表征手段对其样品的晶型、形貌、结构、元素组成等进行了表征。可见光照射下,研究了CdxZn1-xS固溶体、CeO2/CdxZn1-xS异质结产氢性能。Cd0.3Zn0.7S异质结的产氢速率为3.86 mmol·g−1·h−1,分别是CdS、ZnS的4.85、11.03倍。当CeO2负载比例为10%时,CeO2/Cd0.3Zn0.7S异质结具有最佳的光催化性能,产氢速率为7.89 mmol·g−1·h−1,分别是CeO2、Cd0.3Zn0.7S固溶体的40.25、2.04倍。光照下,CeO2的电子迁移到CdxZn1-xS,使得靠近CeO2的异质结界面部分带正电,而靠近CdxZn1-xS的异质结界面部分带负电,形成内电场,增强了载流子分离与迁移性能。

     

  • 图  1  催化剂合成示意图

    Figure  1.  Diagram of catalyst synthesis

    图  2  CdxZn1-xS(CZS-X)的XRD图谱

    Figure  2.  XRD pattern of CdxZn1-xS (CZS-X)

    图  3  y%CCZS-0.3的XRD图谱

    Figure  3.  XRD pattern of y% CCZS-0.3

    图  4  (a) CZS-0.3的SEM图,(b) CeO2的SEM图,(c) 10% CCZS-0.3的SEM图

    Figure  4.  (a) SEM image of CZS-0.3, (b) SEM image of CeO2, (c) SEM image of 10% CCZS-0.3

    图  5  (a-c) 10%CCZS-0.3的的HR-TEM图,(d) 210%CCZS-0.3的EDS mapping,分别为Zn、Cd、S、Ce、O

    Figure  5.  ((a-c) HR-TEM image of 10%CCZS-0.3, (d) EDS mapping of 10%CCZS-0.3

    图  6  (a)样品的XPS全谱,样品的XPS,(b) S 2p,(c) Zn 2p,(d) Cd 3d,(e) O1s,(f) Ce3d

    Figure  6.  (a) XPS full spectrum of the sample, XPS of the sample, (b) S 2p,(c) Zn 2p,(d) Cd 3d,(e) O1s,(f) Ce3d

    图  7  CeO2、CZS-0.3、10% CCZS-0.3的EPR光谱

    Figure  7.  EPR spectrum of CeO2, CZS-0.3, 10% CCZS-0.

    图  8  (a) CZS-X的UV-Vis DRS谱图,(b) CeO2、CZS-0.3、10% CCZS-0.3的UV-Vis DRS谱图,(c) CeO2的带隙

    Figure  8.  (a) UV-Vis DRS of CZS-X, (b) The UV-Vis DRS of CeO2, CZS-0.3 and 10% CCZS-0.3, (c) Band gap of CeO2

    图  9  (a) CZS-0.3的带隙,(b) CeO2的XPS价带谱,(c) CZS-0.3的XPS价带谱

    Figure  9.  (a) Band gap of CZS-0.3, (b) Valence-band spectrum of CeO2, (cf) Valence-band spectrum of CZS-0.3

    图  10  (a)CeO2的能带结构,(b)CeO2的态密度,(c)CZS-0.3的能带结构,(d)CZS-0.3的态密度

    Figure  10.  (a)Band structure of CeO2, (b)Density of states for CeO2, (c)Band structure of CZS-0.3, (d) States density of CZS-0.3

    图  11  (a) CZS-X的光催化产氢性能,(b) CeO2、y%CCZS-0.3的光催化产氢性能,(c) y%CCZS-0.3的光催化产氢性能,(d) 10%CCZS-0.3的产氢稳定性试验,(e) 10%CCZS-0.3反应前后XRD谱图,(f) 10%CCZS-0.3的量子效率

    Figure  11.  (a) Photocatalytic hydrogen production of CZS-X, (b) Photocatalytic hydrogen production of CeO2 and y%CCZS-0.3, (c) Photocatalytic hydrogen production of y%CCZS-0.3, (d) Hydrogen production stability of 10%CCZS-0.3, (e) XRD patters of before and after five cycles of 10%CCZS-0.3, (f) Apparent quantum efficiency(AEQ) of 10%CCZS-0.3

    图  12  CeO2、CZS-0.3、10% CCZS-0.3的(a)瞬态光电流谱,(b)电化学阻抗谱,(c)光致发光光谱,(d-e)CZS-0.3和CeO2的Mott-Schottky曲线,(i)CZS-0.3和CeO2的能带结构示意图

    Figure  12.  (a) Transient photocurrent responses, (b) EIS spectra, (c) PL spectra of CeO2, CZS-0.3 and 10% CCZS-0.3, (d-e) Mott schottky curve CZS-0.3 and CeO2, (i) Band structure of CZS-0.3 and CeO2

    图  13  功函数(a)CeO2,(b)CZS-0.3

    Figure  13.  Work function calculation (a) CeO2, (b) CZS-0.3

    图  14  光催化产氢机制示意图(a)CeO2与CZS-0.3接触前,(b)CeO2与CZS-0.3形成异质结后,(c)光照下10%CCZS-0.3异质结光生电荷转移途径。Ef:费米能级;CB:导带;VB:价带

    Figure  14.  Schematic diagram of photocatalytic hydrogen production mechanism. (a) Before forming heterojunction, (b) After forming heterojunction, (c) Photogenerated charge transfer pathway of 10%CCZS-0.3 heterojunction under light. Ef: Fermi level; CB: Conduction band; VB: Valence band

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  • 收稿日期:  2024-04-11
  • 修回日期:  2024-05-27
  • 录用日期:  2024-05-31
  • 网络出版日期:  2024-06-22

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