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Synthesis of Au‐BiVO 4 Nanocomposite through Anodic Electrodeposition Followed by Galvanic Replacement and Its Application to the Photocatalytic Decomposition of Methyl Orange
Author(s) -
Myung Noseung,
Lee Wooju,
Lee Changhyun,
Jeong Seonghan,
Rajeshwar Krishnan
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402032
Subject(s) - methyl orange , photocatalysis , nanocomposite , materials science , photocurrent , galvanic cell , electrolyte , electrochemistry , anode , photoelectrochemistry , aqueous solution , chemical engineering , inorganic chemistry , chemistry , nanotechnology , metallurgy , catalysis , electrode , optoelectronics , organic chemistry , engineering
A Au‐BiVO 4 nanocomposite is synthesized by a two‐step strategy involving anodic electrodeposition combined with in situ galvanic replacement. First, a BiVO 4 layer is prepared by the anodic oxidation of pre‐electrodeposited Bi film in a VO 4 3− containing electrolyte. Thus‐prepared BiVO 4 film contains excess metallic Bi, which is then galvanically replaced with Au from an aqueous HAuCl 4 solution, resulting in the Au‐BiVO 4 composite in the second step. Optical, photoelectrochemical and photocatalytic properties are investigated by using X‐ray diffraction, energy‐dispersive X‐ray analysis, diffuse reflectance spectrometry, and photoelectrochemical analyses. The visible‐light photocatalytic activity of the Au‐BiVO 4 composite is evaluated using the decomposition of methyl orange dye and is superior to the bare BiVO 4 film counterpart.