[18p-P02-1~30] 6.3 酸化物エレクトロニクス

英語発表

[18p-P02-15] Novel Nanoscale Silver Bismuth Iodide Co-catalyst on Titanium Dioxide Nanofibers for Enhanced Photocatalytic CO₂ Reduction

〇(M2)Chiang KuoPing¹, JiaMao Chang¹, TingHan Lin¹, MingChung Wu¹ (1.Chang Gung Univ.)

キーワード：

Carbon Dioxide Reduction、Solid-Gas Synthesis、heterostructure

The rapid rise in atmospheric CO2 levels, mainly from burning fossil fuels, has become a major environmental concern, contributing significantly to global warming and climate change. The Paris Agreement of 2015 aims to limit global temperature increases to well below 2°C above pre-industrial levels, with an aspirational target of 1.5°C. Photocatalytic CO2 reduction to solar fuels is a promising solution to this issue. In this work, a novel methodology was developed to prepare silver bismuth iodide (SBI) as a cocatalyst on TiO2 nanofibers (NFs), involving a hydrothermal reaction and a solid-gas reaction. The process involves precipitating Ag nano-seeds on TiO2 NFs via hydrothermal method, converting Ag to AgI through immersion in hydriodic acid (HI), and depositing BiI3 via chemical vapor deposition to form a heterostructure (SBI/TiO2 NFs). The SBI/TiO2 NFs demonstrated CO and CH4 production rates of 2.68 μmol/g·h and 0.45 μmol/g·h, respectively, outperforming commercial AEROXIDE P25 and TiO2 NFs. Additionally, the material maintained 76.3% (CO) and 80.0% (CH4) efficiency after five cycles of CO2 reduction. The photocatalytic activity can be enhanced by adjusting the BiI3 ratio and the optimal calcination temperature, presenting a new solution for CO2 reduction using TiO2.