In:
ECS Transactions, The Electrochemical Society, Vol. 58, No. 30 ( 2014-03-13), p. 9-20
Kurzfassung:
In the present study, we utilize phosphomolybdate (PMo 12 O 40 3- ) modified gold nanoparticle (diameters, 30-40 nm) deposits on mesoporous tungsten oxide photoanodes to study plasmon-assisted photoelectrochemical water splitting. Such n-type semiconducting oxide as WO 3 (band gap, 2.5 eV) suffers from inadequate solar light absorption and, therefore, there is a need to use of a thin plasmon active layer of nanostructured Au of proper architecture to enhance the interfacial light trapping and conversion. A remarkable increase in the solar energy conversion efficiency as well as in the photooxidation current (oxygen evolution) are believed to be induced by the plasmonic excitation of Au nanoparticles occurring within WO 3 absorption range. The polyoxometallate (PMo 12 O 40 3- ) monolayer-type nanostructures may play electrocatalytic role, improve charge distribution, in addition to the stabilization effect. In the other study, the PMo 12 O 40 3- modified Au nanoparticles, when deposited on step-bunched silicon Si(111) surface have also acted as electrocatalytic centers during photoelectrochemically induced reduction of carbon oxide (IV). The applicability of phosphomolybdate-protected gold nanoparticles to create porous matrix for photoelectrochemically assisted reduction of carbon dioxide is even more pronounced when the system is further decorated with copper. We also present the result of decorating multi-walled carbon nanotubes with gold and copper nanoparticles (by chemical reduction method and through electrodeposition) acting as catalytic systems active towards CO 2 electroreduction under voltammetric conditions. Carbon nanotubes have been chemically modified here with surface oxygen complexes using HNO 3 and H 3 PMo 12 O 40 solutions.
Materialart:
Online-Ressource
ISSN:
1938-5862
,
1938-6737
DOI:
10.1149/05830.0009ecst
Sprache:
Unbekannt
Verlag:
The Electrochemical Society
Publikationsdatum:
2014