基于光沉积法Cu负载TiO2光热化学循环分解CO2  

PHOTO-THERMOCHEMICAL CYCLE DISSOCIATE CO2 BASED ON Cu LOADED TiO2 BY PHOTODEPOSITION METHOD

作　　者：潘富强 许辰宇 林华超 张彦威[1] 倪明江[1] 岑可法[1] Pan Fuqiang;Xu Chenyu;Lin Huachao;Zhang Yanwei;Ni Mingjiang;Cen Kefa(State Key Laboratory of Clean Energy Utilization,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学能源清洁利用国家重点实验室

出　　处：《太阳能学报》2019年第12期3548-3554,共7页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金面上项目（51976190）;浙江省自然科学基金杰出青年项目（LR18E060001）;中央高校基本科研业务费专项（2019FZA4013）

摘　　要：光热化学循环是一种可同时利用太阳能中高能部分和低能部分将CO2转化成CO或其他碳氢燃料的方法。利用光沉积法制备Cu负载TiO2催化剂CuTiO2(记为CT),用于光热化学循环分解CO2,通过比表面积分析(BET)、X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱分析(XPS)等技术手段对催化剂进行表征并探究其催化机理。实验结果表明,CT分解CO2的平均速率(29.81μmol/(g·h))较P25型TiO2(记为PT)分解CO2的平均速率(2.23μmol/(g·h))提高13倍。UV-vis吸收光谱显示CT吸收边红移,从XPS表征可看出光照后CT表面形成了更多Ti3+;PL图谱显示负载Cu拓展了催化剂的可见光响应,降低了其光生电子空穴对复合率,使表面氧空位更易形成,增大了CO2分解速率。Photo-thermochemical cycle is a novel method to decompose carbon dioxide to carbon monoxide or other hydrocarbon fuels,which can both utilize high-energy part and low-energy part in solar energy.In this article,copper loaded Cu-TiO2(denoted as CT)catalyst prepared by photo-deposition method is used to decompose carbon dioxide by photo-thermochemical cycle.The catalysts are characterized by BET,XRD,SEM,TEM,XPS,etc.The experimental results show that the average rate of carbon dioxide dissociation of CT is 29.81μmol·g-1·h-1 which is enhanced by 13 times than the rate of P25(denoted as PT)(2.23μmol·g-1·h-1).UV-vis absorption spectra shows the CT absorption edge red shift.From the XPS characterization,we could conclude that more Ti3+formed after UV illumination.PL pattern indicates that the supported Cu expands the visible light response of the catalyst,reduces its photo-generated electron hole pairs recombination rate,and makes the surface oxygen vacancies more easily formed,thus increases the CO2 decomposition rate.

关 键 词：CO2利用 光热化学循环 Cu负载 氧空位 二氧化钛 

分 类 号：TK519[动力工程及工程热物理—热能工程]