In:
Angewandte Chemie, Wiley, Vol. 128, No. 19 ( 2016-05-04), p. 5945-5949
Abstract:
Cocatalysis plays an important role in enhancing the activity of semiconductor photocatalysts for solar water splitting. Compared to a single cocatalyst configuration, a cocatalytic system consisting of multiple components with different functions may realize outstanding enhancement through their interactions, yet limited research has been reported. Herein we describe the synergistic cocatalytic effect between carbon nanodots (CDots) and Co 3 O 4 , which promotes the photoelectrochemical water oxidation activity of the Fe 2 O 3 photoanode with a 60 mV cathodically shifted onset potential. The C/Co 3 O 4 ‐Fe 2 O 3 photoanode exhibits a photocurrent density of 1.48 mA cm −2 at 1.23 V (vs. reversible hydrogen electrode), 78 % higher than that of the bare Fe 2 O 3 photoanode. The slow reaction process on the single Co III ‐OH site of the Co 3 O 4 cocatalyst, oxidizing H 2 O to H 2 O 2 with two photogenerated holes, could be accelerated by the timely H 2 O 2 oxidation to O 2 catalyzed on CDots.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v128.19
DOI:
10.1002/ange.201600918
Language:
English
Publisher:
Wiley
Publication Date:
2016
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