Metal Oxide Coated FTO and BiVO4/WO3/FTO Photoelectrodes for Selective O2 Production in NaCl solution
Sayuri Okunaka a, Yugo Miseki a, Kazuhiro Sayama a
a National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
nanoGe Fall Meeting
Proceedings of nanoGe Fall Meeting19 (NGFM19)
#SolFuel19. Solar Fuel Synthesis: From Bio-inspired Catalysis to Devices
Berlin, Germany, 2019 November 3rd - 8th
Organizers: Roel van de Krol and Erwin Reisner
Poster, Sayuri Okunaka, 347
Publication date: 16th July 2019

Producing hydrogen fuel through environmentally friendly electrochemical and photoelectrochemical water splitting is a promising method for providing clean energy carriers in the future. The use of seawater, that is the most abundant aqueous electrolyte feedstock on Earth, has the advantage of eliminating competition with freshwater resources. However, its implementation in the water splitting process has many challenges, especially for the anodic reaction; the oxygen evolution and the oxidation of Cl- ion to HClO should occur at the anode simultaneously when seawater is used as an electrolyte solution. Therefore, it is still challenging to carry out the two reactions separately. One of the potential strategies for selective oxidation is to introduce a metal oxide layer on the surface of (photo)electrodes. So far, there are a few reports on metal oxides modification on metal substrates for selective O2 evolution from the electrolyte solution containing Cl- ion.1 However, the modification effect on wide variety of metal oxides on FTO substrate has not been investigated systematically. Recently, our group demonstrated the photoelectrochemical HClO production from aqueous NaCl solution, using BiVO4/WO3/FTO multilayer photoanode under visible light irradiation.2 In this work, we investigated the effect of coating of metal oxides on the selectivity of O2 production from aqueous NaCl solution over FTO anode or BiVO4/WO3/FTO photoanode in detail.

The metal oxides (MOx)-coated FTO electrodes or BiVO4/WO3/FTO photoelectrodes were prepared by spin-coating of a corresponding metal organic solution, followed by calcination in air. The effects of coated MOx layer on the selectivity at an applied electric charge of 2 C in an aqueous NaCl solution, and further investigation on the mechanism of selective O2 generation on MOx coated anodes will be discussed in the poster. 

This work was partially supported by the JSPS KAKENHI Grant Number JP17H06439 (I4LEC).

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