標題: | Sandwich-Nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction |
作者: | Lin, Yu-Chang Hsu, Liang-Ching Lin, Chia-Yu Chiang, Chao-Lung Chou, Che-Min Wu, Wen-Wei Chen, San-Yuan Lin, Yan-Gu 材料科學與工程學系 Department of Materials Science and Engineering |
關鍵字: | solar water splitting;sandwich structure;copper(I) oxide;photocathode;localized surface plasmon resonance |
公開日期: | 23-十月-2019 |
摘要: | An n-Cu2O layer formed a high-quality buried junction with p-Cu2O to increase the photovoltage and thus to shift the turn-on voltage positively. Mott-Schottky measurements confirmed that the improvement benefited from a positive shift in flat-band potential. The obtained extremely positive onset potential, 0.8 V-RHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water reduction catalysts. The AuAg alloy sandwiched between the homo-junction of n-Cu2O and p-Cu2O improved the photocatalytic performance. This alloy both served as an electron relay and promoted electron-hole pair generation in nearby semiconductors; the charge transfer between n-Cu2O and p-Cu2O in the sandwich structure was measured with X-ray absorption spectra. The proposed sandwich structure can be considered as a new direction for the design of efficient solar-related devices. |
URI: | http://dx.doi.org/10.1021/acsami.9b11737 http://hdl.handle.net/11536/153188 |
ISSN: | 1944-8244 |
DOI: | 10.1021/acsami.9b11737 |
期刊: | ACS APPLIED MATERIALS & INTERFACES |
Volume: | 11 |
Issue: | 42 |
起始頁: | 38625 |
結束頁: | 38632 |
顯示於類別: | 期刊論文 |