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VISIBLE-LIGHT-ACTIVE SEMICONDUCTOR HETEROJUNCTIONS FOR ENHANCED PHOTOCATALYTIC ACTIVITY

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abstract
A clean and sustainable energy source is a basic requirement for addressing the current increase in global energy demand and environmental issues. Because of its potential for solving current energy and environmental problems, semiconductor-based photocatalysis has received tremendous attention in the last few decades. A significant number of studies have been recently reported on the development of new photocatalytic materials, modification of existing materials to enhance light harvesting, and increasing the number of active sites in order to buttress photocatalytic activity. In a semiconductor photocatalytic system, photo–induced electron-hole pairs are produced when a photocatalyst is illuminated by light with frequencies larger than that of its band gap (h  Eg). The resulting photo-excited charge carriers can either recombine with no activity or migrate to the surface of the semiconductor without recombination, where they can be involved in redox processes. The photocatalytic efficiency depends on the number of charge carriers taking part in the redox reactions and on the lifetime of the electron-hole pairs generated by the photoexcitation. High recombination of photo excited charge carriers and limited efficiency under the visible light are the two limiting factors in the development of efficient semiconductor-based photocatalysts.
subject
inorganic chemistry
material chemistry
photocatalysis
water splitting
contributor
Adhikari, Shiba Prasad (author)
Lachgar, Abdou (committee chair)
Colyer, Christa (committee member)
Geyer, Scott (committee member)
Williams, Richard (committee member)
Welker, Mark (committee member)
date
2017-08-22T08:35:26Z (accessioned)
2017-08-22T08:35:26Z (available)
2017 (issued)
degree
Chemistry (discipline)
identifier
http://hdl.handle.net/10339/86349 (uri)
language
en (iso)
publisher
Wake Forest University
title
VISIBLE-LIGHT-ACTIVE SEMICONDUCTOR HETEROJUNCTIONS FOR ENHANCED PHOTOCATALYTIC ACTIVITY
type
Dissertation

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