A New Class of Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two Mesoporous TiO2 Electrodes

Kohei Morita; Ken Sakai; Hironobu Ozawa

doi:10.1021/acsaem.8b01992

A New Class of Molecular-Based Photoelectrochemical Cell for Solar Hydrogen Production Consisting of Two Mesoporous TiO₂ Electrodes

Kohei Morita, Ken Sakai, Hironobu Ozawa

Inorganic and Analytical Chemistry

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

A new class of molecular-based photoelectrochemical cell for solar hydrogen production consisting of a TiO₂-based photoanode modified with a polypyridyl ruthenium photosensitizer (Ru-qpy) and a TiO₂-based cathode modified with a platinum porphyrin H₂ evolution catalyst has been investigated, showing that the electron accumulation at the conduction band of TiO₂ at the photoanode is promoted via electron injection from the Ru-qpy together with hole scavenging by a sacrificial donor. Our study here for the first time unveils that the upward shift given in the Fermi level of the TiO₂ at the photoanode provides an electromotive force required to flow electrical current leading to solar hydrogen production from water even without applying external electrical bias.

Original language	English
Pages (from-to)	987-992
Number of pages	6
Journal	ACS Applied Energy Materials
Volume	2
Issue number	2
DOIs	https://doi.org/10.1021/acsaem.8b01992
Publication status	Published - Feb 25 2019

All Science Journal Classification (ASJC) codes

Chemical Engineering (miscellaneous)
Energy Engineering and Power Technology
Electrochemistry
Materials Chemistry
Electrical and Electronic Engineering

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10.1021/acsaem.8b01992

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abstract = "A new class of molecular-based photoelectrochemical cell for solar hydrogen production consisting of a TiO2-based photoanode modified with a polypyridyl ruthenium photosensitizer (Ru-qpy) and a TiO2-based cathode modified with a platinum porphyrin H2 evolution catalyst has been investigated, showing that the electron accumulation at the conduction band of TiO2 at the photoanode is promoted via electron injection from the Ru-qpy together with hole scavenging by a sacrificial donor. Our study here for the first time unveils that the upward shift given in the Fermi level of the TiO2 at the photoanode provides an electromotive force required to flow electrical current leading to solar hydrogen production from water even without applying external electrical bias.",

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