ZnTe-based photocathode for hydrogen evolution from water under sunlight
Zinc telluride (ZnTe)-based photocathodes with appropriate modifications showed incident-photon-to-current conversion efficiencies (IPCEs) higher than 30% at 420–520 nm, reached 40% IPCE at 460 nm, and were not zero up to 710 nm because of photoexcitation related to the intermediate-band. ZnTe films...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2020-04-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0002621 |
| _version_ | 1811219303049986048 |
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| author | Tsutomu Minegishi Atsushi Ohnishi Yuriy Pihosh Kentaro Hatagami Tomohiro Higashi Masao Katayama Kazunari Domen Masakazu Sugiyama |
| author_facet | Tsutomu Minegishi Atsushi Ohnishi Yuriy Pihosh Kentaro Hatagami Tomohiro Higashi Masao Katayama Kazunari Domen Masakazu Sugiyama |
| author_sort | Tsutomu Minegishi |
| collection | DOAJ |
| description | Zinc telluride (ZnTe)-based photocathodes with appropriate modifications showed incident-photon-to-current conversion efficiencies (IPCEs) higher than 30% at 420–520 nm, reached 40% IPCE at 460 nm, and were not zero up to 710 nm because of photoexcitation related to the intermediate-band. ZnTe films were prepared by productive close-spaced sublimation. After surface modification with CdS and Pt, the photocathode showed clear cathodic photoresponse in the phosphate buffer solution. The modulation of substrate temperature, incorporation of Cu, and further surface modification with very thin Mo and Ti layers significantly enhanced cathodic photocurrent which contributes to hydrogen evolution from water. Through the measurement of IPCEs, photoelectrochemical hydrogen evolution from water utilizing photoexcitation related to the intermediate-band was first confirmed. The photocathode showed advantageous durability under simulated sunlight: during irradiation of about 50 min, the stabilized photocurrent slightly decreased from 1.6 mA cm−2 to 1.5 mA cm−2. |
| first_indexed | 2024-04-12T07:23:58Z |
| format | Article |
| id | doaj.art-a046493bf7a34bc89fd8d4b0ef88a19a |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-04-12T07:23:58Z |
| publishDate | 2020-04-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-a046493bf7a34bc89fd8d4b0ef88a19a2022-12-22T03:42:14ZengAIP Publishing LLCAPL Materials2166-532X2020-04-0184041101041101-610.1063/5.0002621ZnTe-based photocathode for hydrogen evolution from water under sunlightTsutomu Minegishi0Atsushi Ohnishi1Yuriy Pihosh2Kentaro Hatagami3Tomohiro Higashi4Masao Katayama5Kazunari Domen6Masakazu Sugiyama7Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanOffice of University Professors, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanResearch Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanDepartment of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanDepartment of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanOffice of University Professors, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanResearch Center for Advanced Science and Technology (RCAST), The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, JapanZinc telluride (ZnTe)-based photocathodes with appropriate modifications showed incident-photon-to-current conversion efficiencies (IPCEs) higher than 30% at 420–520 nm, reached 40% IPCE at 460 nm, and were not zero up to 710 nm because of photoexcitation related to the intermediate-band. ZnTe films were prepared by productive close-spaced sublimation. After surface modification with CdS and Pt, the photocathode showed clear cathodic photoresponse in the phosphate buffer solution. The modulation of substrate temperature, incorporation of Cu, and further surface modification with very thin Mo and Ti layers significantly enhanced cathodic photocurrent which contributes to hydrogen evolution from water. Through the measurement of IPCEs, photoelectrochemical hydrogen evolution from water utilizing photoexcitation related to the intermediate-band was first confirmed. The photocathode showed advantageous durability under simulated sunlight: during irradiation of about 50 min, the stabilized photocurrent slightly decreased from 1.6 mA cm−2 to 1.5 mA cm−2.http://dx.doi.org/10.1063/5.0002621 |
| spellingShingle | Tsutomu Minegishi Atsushi Ohnishi Yuriy Pihosh Kentaro Hatagami Tomohiro Higashi Masao Katayama Kazunari Domen Masakazu Sugiyama ZnTe-based photocathode for hydrogen evolution from water under sunlight APL Materials |
| title | ZnTe-based photocathode for hydrogen evolution from water under sunlight |
| title_full | ZnTe-based photocathode for hydrogen evolution from water under sunlight |
| title_fullStr | ZnTe-based photocathode for hydrogen evolution from water under sunlight |
| title_full_unstemmed | ZnTe-based photocathode for hydrogen evolution from water under sunlight |
| title_short | ZnTe-based photocathode for hydrogen evolution from water under sunlight |
| title_sort | znte based photocathode for hydrogen evolution from water under sunlight |
| url | http://dx.doi.org/10.1063/5.0002621 |
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