Reduced Graphene Oxide (rGO)/BiVO₄ Composites with Maximized Interfacial Coupling for Visible Lght Photocatalysis

Abstract

This paper describes the construction of reduced graphene oxide (rGO)/BiVO 4 composites with maximized interfacial coupling and their application as visible light photocatalysts. Thin rGO sheets (<5 nm) could completely cover BiVO 4 polyhedrons with highly active (040) facets exposed through an evaporation-induced self-assembly process. In addition to the increased surface adsorption effect of rGO, a considerable enhancement of the photoactivity of BiVO 4 has been demonstrated through the degradation of methylene blue upon the covering of rGO. The improved photocatalytic activity is attributed to the formation of well-defined rGO/BiVO 4 interfaces, which greatly enhances the charge separation efficiency.

Free-standing graphene/bismuth vanadate monolith composite as a binder-free electrode for symmetrical supercapacitors

“…28 Due to the introduction of GR, the electrical conductivity of the GR/ BiVO 4 composite is much improved and thus a greater current density compared to the pure BiVO 4 electrode is obtained in the same potential window. This phenomenon is similar to that of a GR/BiVO 4 composite photocatalyst, 29 in which the photogenerated electrons from BiVO 4 nanoparticles could fast transfer to GR nanosheets and therefore an effective charge separation combined with a higher photocatalytic activity was nally obtained.…”

Synthesis of magnetically separable Fe3O4@PANI/TiO2 photocatalyst with fast charge migration for photodegradation of EDTA under visible-light irradiation

“…In recent years, the exploitation of novel photocatalyst with superior visible-light response is a very hot research area [10][11][12][13][14]. Anatase TiO 2 exhibits superior photoactivity under UV light irradiation and is the most frequently used photocatalyst in water treatment process [15][16][17][18][19], but its wide band gap (3.2 eV) has obviously hindered its sufficient utilization of sunlight [20].…”

A simple route to significant enhancement of photocatalytic water oxidation on BiVO4 by heterojunction with SiC

“…BiVO 4 , with a band gap of 2.4 eV, is an OER catalyst under visible light irradiation because its valence band (VB) is more positive than the H 2 O/O 2 redox potential [8][9][10][11]. And it is also commonly utilized as an excellent visible-light photocatalyst http for pollutant degradation [12][13][14][15]. However, the nature of easy electron-hole recombination in BiVO 4 severely limits its function.…”