EconPapers    
Economics at your fingertips  
 

Internal quantum efficiency higher than 100% achieved by combining doping and quantum effects for photocatalytic overall water splitting

Youzi Zhang, YuKe Li, Xu Xin, Yijin Wang, Peng Guo, Ruiling Wang, Bilin Wang, Wenjing Huang, Ana Jorge Sobrido and Xuanhua Li ()
Additional contact information
Youzi Zhang: Northwestern Polytechnical University
YuKe Li: Chinese University of Hong Kong
Xu Xin: Northwestern Polytechnical University
Yijin Wang: Northwestern Polytechnical University
Peng Guo: Northwestern Polytechnical University
Ruiling Wang: Northwestern Polytechnical University
Bilin Wang: Northwestern Polytechnical University
Wenjing Huang: Guangdong University of Technology
Ana Jorge Sobrido: Queen Mary University of London
Xuanhua Li: Northwestern Polytechnical University

Nature Energy, 2023, vol. 8, issue 5, 504-514

Abstract: Abstract Multiple exciton generation (MEG), where two or more electron–hole pairs are produced from the absorption of one high-energy photon, could increase the efficiency of light absorbing devices. However, demonstrations of the effect are still scarce in photocatalytic hydrogen production. Moreover, many photocatalytic systems for overall water splitting suffer from poor charge carrier separation. Here we show that a CdTe quantum dot/vanadium-doped indium sulphide (CdTe/V-In2S3) photocatalyst has a built-in electric field and cascade energy band structure sufficient to effectively extract excitons and separate carriers, allowing MEG to be exploited for hydrogen production. We achieve a tunable energy band structure through quantum effects in CdTe and doping engineering of V-In2S3, which induces a 14-fold enhancement in the CdTe/V-In2S3 interfacial built-in electric field intensity relative to pristine CdTe/V-In2S3. We report an internal quantum efficiency of 114% at 350 nm for photocatalytic hydrogen production, demonstrating the utilization of MEG effects. The solar-to-hydrogen efficiency is 1.31%.

Date: 2023
References: Add references at CitEc
Citations: View citations in EconPapers (2)

Downloads: (external link)
https://www.nature.com/articles/s41560-023-01242-7 Abstract (text/html)
Access to the full text of the articles in this series is restricted.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natene:v:8:y:2023:i:5:d:10.1038_s41560-023-01242-7

Ordering information: This journal article can be ordered from
https://www.nature.com/nenergy/

DOI: 10.1038/s41560-023-01242-7

Access Statistics for this article

Nature Energy is currently edited by Fouad Khan

More articles in Nature Energy from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().

 
Page updated 2025-03-19
Handle: RePEc:nat:natene:v:8:y:2023:i:5:d:10.1038_s41560-023-01242-7