Screening of photocatalysts by scanning electrochemical microscopy

Analytical Chemistry
Joowook LeeAllen J Bard

Abstract

A method for rapid screening of photocatalysts employing a form of scanning electrochemical microscopy (SECM) is described. A piezoelectric dispenser was used to deposit arrays composed of approximately 300-microm-size photocatalyst spots with different compositions onto conducting glass, fluorine-doped tin oxide substrate. The scanning tip of the SECM was replaced by a fiber optic connected to a xenon lamp and was rapidly scanned over the array. In this arrangement, the photocatalytic performance of the spots was evaluated by measuring the photocurrent at the substrate of the array. A fiber optic with a ring electrode can also be used to electrochemically detect products of the photoreaction. Several iron oxide-based bimetallic oxide combinations were found to exhibit enhanced photocatalytic activity, when compared to pure alpha-Fe2O3. These combinations included iron-palladium, iron-europium, and iron-rubidium in specific ratios. A trimetallic bismuth-vanadium-zinc oxide combination was also found to show a higher photocurrent, by approximately 40%, compared to BiVO3.

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Citations

Jun 21, 2011·The Journal of Chemical Physics·Zachary D Pozun, Graeme Henkelman
May 23, 2014·Annual Review of Analytical Chemistry·Allen J Bard
Oct 27, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Barak D B AaronsonPatrick R Unwin
May 30, 2015·Chemical Communications : Chem Comm·Michael A O'ConnellAndrew J Wain
Oct 28, 2011·Physical Chemistry Chemical Physics : PCCP·Michael V MirkinYixian Wang
Dec 10, 2020·Chemical Society Reviews·Christine Kranz, Maria Wächtler
May 18, 2010·Journal of the American Chemical Society·Allen J Bard
Feb 7, 2020·Journal of the American Chemical Society·Yao YangHéctor D Abruña
May 14, 2011·Analytical Chemistry·Dmitry MomotenkoHubert H Girault
Nov 11, 2010·Chemical Reviews·Michael G WalterNathan S Lewis
Nov 25, 2014·Analytical Chemistry·Ding YuanDongping Zhan
Mar 24, 2015·Analytical Chemistry·Barak D B AaronsonPatrick R Unwin
May 31, 2019·ACS Combinatorial Science·Jordan S ComptonLee R Sharpe
Aug 29, 2018·Analytical Chemistry·Glen D O'NeilDaniel V Esposito
Sep 3, 2021·Physical Chemistry Chemical Physics : PCCP·Takumu KosakaHiroshi Onishi
Nov 3, 2021·The Journal of Physical Chemistry Letters·Wei NieFengtao Fan

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