Development of highly efficient multielectron-transfer photocatalytic systems

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14086
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Inorganic industrial materials
• Research Institution: Hokkaido University
• Principal Investigator: Ohtani Bunsho 北海道大学, 触媒科学研究所, 教授 (80176924)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 不均一系光触媒反応 / 酸素生成反応 / 酸化チタン(IV) / 電子受容体 / 光強度依存性 / 高強度UV-LED / 酸素生成助触媒

Outline of Final Research Achievements

Novel kinetic equation was proposed to explain all the observed light-intensity dependence for photocatalytic oxygen evolution by suspended titania particles in which the reaction proceed only when multiple positive holes are accumulated within their lifetime. Related to this mechanism, "effective particle size", which shows the size of a particle or its aggregate allowing accumulation and multiple hole transfer at the same time, is proposed as a novel concept. The mechanism of enhancement of reaction rate by loading so-call co-catalysts, such as cobalt phosphate and iridium oxide, was analyzed by the light-intensity dependences to show there are at least two kinds of mechanisms.

Free Research Field

光触媒反応科学