| 查看: 706 | 回复: 1 | |||
| 当前主题已经存档。 | |||
可可西里木虫之王 (文学泰斗)
甾体者说
|
[交流]
在来一篇 均相光催化剂
|
||
|
J. Phys. Chem. B, 110 (47), 24047 -24053, 2006. 10.1021/jp065215v S1520-6106(06)05215-1 Web Release Date: November 9, 2006 Copyright © 2006 American Chemical Society Viologen-Modified Platinum Clusters Acting as an Efficient Catalyst in Photocatalytic Hydrogen Evolution Hiroaki Kotani, Kei Ohkubo, Yoshizo Takai, and Shunichi Fukuzumi* Department of Material and Life Science, Graduate School of Engineering, Osaka University, SORST, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan Received: August 12, 2006 In Final Form: September 20, 2006 Abstract: A highly efficient photocatalytic system for hydrogen evolution with dihydronicotinamide coenzyme (NADH) as a sacrificial agent in an aqueous solution has been constructed by using water-soluble platinum clusters functionalized with methyl viologen-alkanethiol (MVA2+) and a simple electron-donor dyad, 9-mesityl-10-methylacridinium ion (Acr+-Mes), which is capable of fast photoinduced electron transfer but extremely slow back electron transfer. The mean diameter of the platinum core was determined as RCORE = 1.9 nm with a standard deviation = 0.5 nm by transmission electron microscopy (TEM). As a result, the hydrogen-evolution rate of the photocatalytic system with MVA2+-modified platinum clusters (MVA2+-PtC) is 10 times faster than the photocatalytic system with the mixture of the same amount of MVA2+ and platinum clusters as that of MVA2+-PtC under otherwise the same experimental conditions. The radical cation of NADH has been successfully detected by laser flash photolysis experiments. The decay of the absorbance due to NAD, produced by the deprotonation from NADH+, coincides with the appearance of the absorption band due to Acr-Mes. This indicates electron transfer from NAD to Acr+-Mes to give Acr-Mes, which undergoes the electron-transfer reduction of MVA2+-PtC, leading to the efficient hydrogen evolution. [ Last edited by daiqiguang on 2007-5-8 at 12:20 ] |
回复此楼» 猜你喜欢
西安交通大学 赵旭课题组 2026年招收博士后-电催化方向
已经有0人回复
-
焙烧后的拉西环状铁钼催化剂侧面硬度高，应该如何降低？
已经有1人回复
-
化学工程及工业化学论文润色/翻译怎么收费?
已经有83人回复
-
欢迎来稿
已经有213人回复
-
双一流大学湘潭大学“化工过程模拟与强化”国家地方联合工程研究中心招收博士生
已经有52人回复
-
大连海事大学国家级人才团队（船舶洁净能源研究中心）2027年博士研究生招生启事
已经有1人回复
-
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有56人回复
-
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有58人回复
sedulity2005
银虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 448.8
- 帖子: 133
- 在线: 10.2小时
- 虫号: 131789
- 注册: 2005-12-12
- 专业: 其他无机非金属材料
2楼2007-05-01 03:00:28
50