亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

Behaviors and Energy States of Photogenerated Charge Carriers on Pt or CoOx Loaded LaTiO2n Photocatalysts Studied By Time-Resolved Absorption Spectroscopy

光化学 光谱学 材料科学 载流子 吸收(声学) 吸收光谱法 电荷(物理) 光电子学 化学 光学 物理 量子力学 复合材料
作者
Akira Yamakata,Masayuki Kawaguchi,Jun Kubota,Kazunari Domen
出处
期刊:Meeting abstracts 卷期号:MA2014-02 (8): 548-548 被引量:1
标识
DOI:10.1149/ma2014-02/8/548
摘要

For the development of highly efficient photocatalysts, energy states as well as the behaviors of photogenerated charge carriers should be elucidated. Femtosecond to second time-resolved visible to mid-IR absorption spectroscopy is useful to investigate the matters, therefore we applied this method to study the role of cocatalysts loaded on visible-light responsible LaTiO 2 N photocatalyst: this catalyst has poor activity for H 2 evolution but highest activity for O 2 evolution when CoO x was loaded. Time-resolved absorption study revealed that most of the electrons are trapped in the mid-gap states, created below 0.74 eV (6000 cm -1 ) from the conduction band. As a result, the number of free electrons giving the transient absorption below 2000 cm -1 was much smaller than that of the trapped electrons. When Pt was loaded, the electrons were captured by Pt and the lifetime of the holes (which give the absorption band at 17000 cm -1 ) became longer, however these processes proceeded at tens of microseconds and the efficiency was not high enough. On the contrary, the CoO x -loading resulted in the capture of holes within a few ps, and drastically elongated the lifetime of electrons to second region. Additionally, the depth of the electron trap became shallower from 0.74 eV (6000 cm -1 ) to 0.49 eV (4000 cm -1 ), suggesting the reactivity of the trapped electrons becomes higher. These perturbations to the electrons and holes are responsible for the increase of the photocatalytic activities. We expected that co-loading of Pt and CoO x further increased the activities but the recombination was accelerated.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
重要元灵完成签到 ,获得积分10
12秒前
科研通AI2S应助科研通管家采纳,获得10
48秒前
完美世界应助科研通管家采纳,获得10
48秒前
俏皮元珊完成签到 ,获得积分10
1分钟前
21完成签到 ,获得积分10
1分钟前
1分钟前
自然芷文发布了新的文献求助10
1分钟前
112345完成签到 ,获得积分10
1分钟前
自然芷文完成签到,获得积分10
2分钟前
2分钟前
迷人问兰发布了新的文献求助10
2分钟前
科研通AI2S应助科研通管家采纳,获得19
2分钟前
sjyu1985完成签到 ,获得积分10
3分钟前
闻巷雨完成签到 ,获得积分10
3分钟前
pegasus0802完成签到 ,获得积分10
3分钟前
5823364完成签到,获得积分10
4分钟前
automan完成签到,获得积分10
4分钟前
天亮polar完成签到,获得积分10
4分钟前
4分钟前
5分钟前
5分钟前
朴实云应发布了新的文献求助10
5分钟前
林子青完成签到,获得积分10
5分钟前
核桃发布了新的文献求助30
6分钟前
李健应助reerwt采纳,获得10
6分钟前
6分钟前
ICSSCI发布了新的文献求助10
6分钟前
6分钟前
刘宇童给刘宇童的求助进行了留言
6分钟前
reerwt发布了新的文献求助10
6分钟前
6分钟前
科研通AI2S应助科研通管家采纳,获得10
6分钟前
科研通AI2S应助科研通管家采纳,获得10
6分钟前
ICSSCI完成签到,获得积分10
6分钟前
7分钟前
董可以发布了新的文献求助10
7分钟前
风华正茂完成签到,获得积分10
7分钟前
7分钟前
7分钟前
jimmy_bytheway完成签到,获得积分0
7分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3990049
求助须知:如何正确求助?哪些是违规求助? 3532108
关于积分的说明 11256369
捐赠科研通 3270998
什么是DOI,文献DOI怎么找? 1805166
邀请新用户注册赠送积分活动 882270
科研通“疑难数据库(出版商)”最低求助积分说明 809228