Sandwich-nanostructured n-Cu2O/AuAg/p-Cu2O Photocathode with Highly Positive Onset Potential for Improved Water Reduction

Yu Chang Lin, Liang Ching Hsu, Chia Yu Lin, Chao Lung Chiang, Che Min Chou, Wen Wei Wu, San Yuan Chen*, Yan Gu Lin


研究成果: Article同行評審

23 引文 斯高帕斯(Scopus)


A 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 thermodynamic shift of the flat-band potentials. The obtained extremely positive onset potential, 0.8 VRHE in n-Cu2O/AuAg/p-Cu2O, is comparable with measurements from water-reduction catalysts. The AuAg alloy sandwiched between the homojunction 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. Acting as a plasmonic photosensitizer, the alloy increased the efficiency of conversion of solar energy to electric current. The mechanism of plasmonic energy transfer involved a direct transfer of the plasmonic hot carriers; the interfacial Schottky barrier height modulated the plasmonic hot electron transfer. This facile sandwich structure combines both electrical and optical functions of alloy nanoparticles into a single structure, which has implications for the design of efficient devices to harvest solar energy.

頁(從 - 到)38625-38632
期刊ACS Applied Materials and Interfaces
出版狀態Published - 23 10月 2019


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