NDLI: Porous TaON Photoanodes Loaded with Cobalt-Based Cocatalysts for Efficient and Stable Water Oxidation Under Visible Light

Content Provider	Springer Nature Link
Author	Higashi, Masabu Tomita, Osamu Abe, Ryu
Copyright Year	2016
Abstract	Porous photoanodes for visible-light-induced water oxidation were prepared via simple electrophoretic deposition of TaON particles, preliminarily modified with CoO$_{ x }$ nanoparticles, on a Ti substrate. Post-necking process involving methanolic TaCl$_{5}$ solution and subsequent heating in NH$_{3}$ stream formed bridges between TaON particles, which facilitated electron transport within the porous electrode and thereby increased the photocurrent significantly. The temperature of the NH$_{3}$ treatment in the post-necking process significantly influenced both the charge transport through the bridges and the activity of the CoO$_{ x }$ cocatalyst for water oxidation, thus producing maximum photocurrent after heating at 723 K. The highly dispersed CoO$_{ x }$ nanoparticles considerably improved the stability of the photocurrent due to efficient capture of photogenerated holes and consequent reduction of the probability of self-oxidative deactivation of the TaON surface. The combination of phosphate buffer solutions with a highly dispersed CoO$_{ x }$ cocatalyst on the TaON surface significantly increased the photocurrent due to the in situ photoelectrochemical production of an amorphous cobalt/phosphate (Co–Pi) phase, which covers the TaON surface almost entirely, and consequently improved the its stability in long-term photoirradiation.
Starting Page	740
Ending Page	749
Page Count	10
File Format	PDF
ISSN	10225528
Journal	Topics in Catalysis
Volume Number	59
Issue Number	8-9
e-ISSN	15729028
Language	English
Publisher	Springer US
Publisher Date	2016-04-12
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Water splitting Visible light Oxynitride Photoanode Water oxidation Cocatalyst Catalysis Physical Chemistry Pharmacy Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Chemistry Catalysis

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