Статья

Heterointegration of Pt/Si/Ag Nanowire Photodiodes and Their Photocatalytic Properties

Yongquan QuDepartment of Chemistry and Biochemistry University of California, Los Angeles, CA 90095 (USA)Xue TengDepartment of Materials Science and Engineering, University of California, Los Angeles, CA 90095 USAXing ZhongDepartment of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USAYung‐Chen LinDepartment of Materials Science and Engineering, University of California, Los Angeles, CA 90095 USALei LiaoDepartment of Chemistry and Biochemistry, University of California, Los Angeles, CA, 90095, USAJina ChoiW. M. Keck Laboratory, California Institute of Technology, Pasadena, CA 91125, USAXiangfeng DuanDepartment of Chemistry and Biochemistry, University of California-Los Angeles, CA 90095 (USA)

2010en

ABI

Аннотация

Photocatalyst mediated photoelectrochemical processes can make use of the photogenerated electrons and holes onsite for photocatalytic redox reactions, and enable the harness and conversion of solar energy into chemical energy, in analogy to natural photosynthesis. However, the photocatalysts available to date are limited by either poor efficiency in the visible light range or insufficient photoelectrochemical stability. We show that a Pt/Si/Ag nanowire heterostructure can be rationally synthesized to integrate a nanoscale metal-semiconductor Schottky diode encased in a protective insulating shell with two exposed metal catalysts. The synthesis of Pt/Si/Ag nanowire diodes involves a scalable process including the formation of silicon nanowire array through wet chemical etching, electrodeposition of platinum and photoreduction of silver. We further demonstrated that the Pt/Si/Ag diodes exhibited highly efficient photocatalytic activity for a wide range of applications including environmental remediation and solar fuel production in the visible range. In this article, photodegradation of indigo carmine and 4-nitrophenol were used to evaluate the photoactivity of Pt/Si/Ag diodes. The Pt/Si/Ag diodes also show high activity for photoconversion of formic acid into carbon dioxide and hydrogen.

Перевод пока недоступен

Идентификаторы

DOI: 10.1002/adfm.201000857

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar