Rational construction of multiple interfaces in ternary heterostructure for efficient spatial separation and transfer of photogenerated carriers in the application of photocatalytic hydrogen evolution

JOURNAL OF POWER SOURCES

卷:379

Article

Shi, Jian-Wen¹  Ma, Dandan¹  Zou, Yajun¹  Fan, Zhaoyang¹  Shi, Jinwen²  Cheng, Linhao¹  Ji, Xin¹  Niu, Chunming¹ 

[1] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Ctr Nanomat Renewable Energy, Sch Elect Engn, Xian 710049, Shaanxi, Peoples R China

[2] Xi An Jiao Tong Univ, IRCRE, State Key Lab Multiphase Flow Power Engn MFPE, Xian 710049, Shaanxi, Peoples R China

关键词: Photocatalysis;    H-2 evolution;    Water splitting;    Heterostructure;    Multiple interfaces;    Carrier-transfer pathways;   

DOI  :  10.1016/j.jpowsour.2018.01.031

来源: Elsevier

【 摘 要 】

The design of efficient and stable photocatalyst plays a critical role in the photocatalytic hydrogen evolution from water splitting. Herein, we develop a novel ZnS/CdS/ZnO ternary heterostructure by the in-situ sulfuration of CdS/ZnO, which includes four contact interfaces: CdS-ZnS interface, ZnS-ZnO interface, CdS-ZnO interface and ZnS-CdS-ZnO ternary interface, forming three charge carrier-transfer modes (type-I, type-II and direct Z scheme) through five carrier-transfer pathways. As a result, the separation and transfer of photoexcited electron hole pairs are promoted significantly, resulting in a high hydrogen evolution rate of 44.70 mmol h(-1) g(-1), which is 2, 3.7 and 8 times higher than those of binary heterostructures, CdS/ZnO, CdS/ZnS and ZnS/ZnO, respectively, and 26.5, 280 and 298 times higher than those of single CdS, ZnO and ZnS, respectively. As a counterpart ternary heterostructure, CdS/ZnS/ZnO contains only two interfaces: CdS-ZnS interface and ZnS-ZnO interface, which form two charge carrier-transfer modes (type-I and type-II) through two carrier-transfer pathways, leading to its much lower hydrogen evolution rate (27.25 mmol h(-1) g(-1)) than ZnS/CdS/ZnO ternary heterostructure. This work is relevant for understanding the charge-transfer pathways between multi-interfaces in multicomponent heterojunctions.

【 授权许可】

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