Selective visible light reduction of carbon dioxide over iridium(III)-terpyridine photocatalysts

Wang, Chang-ting1; Chen, Jinfan1,2; Xu, Jiayuan3; Wei, Fangfang3; Yam, Chi Yung4,5; Wong, Keith Man-Chung3; Sit, Patrick H-L1; Teoh, Wey Yang1,6,7

2021-12-01

10.1016/j.mtchem.2021.100563

Materials Today Chemistry   影响因子和分区

2468-5194

The CO2 reduction reaction is an imperative piece of technology that closes the carbon cycle in many critical energy conversion and chemical manufacturing processes. Here, we report two new iridium (III) terpyridine-based photocatalysts capable of selective reduction of CO2 to CO under visible light (lambda >= 420 nm). The first photocatalyst, [Ir-COOH], was functionalized with the carboxyl group on the phenylpyridine, whereas the second, [Ir-PhCOOH], was attached to a phenyl spacer on the terpyridine. The [Ir-PhCOOH] was characterized by a higher extinction coefficient than [Ir-COOH], thus allowing more absorption of photons. Although both photocatalysts require two-electron activation, the [Ir-PhCOOH] is more readily activated as a result of the more negatively charged Ir center. These photo catalysts show exclusive selectivities in the production of CO. The turnover frequencies for [Ir-COOH] and [Ir-PhCOOH] were 19 and 10 h(-1), respectively, under visible light irradiation. The e-e-H-H pathway was identified as the most favorable, consisting of the rate-limiting step in the conversion of *COOH to *CO, and where the barrier is significantly lower for [Ir-PhCOOH] than for [Ir-COOH]. (C) 2021 Elsevier Ltd. All rights reserved.

CO2 Photocatalyst Iridium Visible light Mechanism

SCI ; EI

英语

通讯

Research Grants Council of Hong Kong[11337116] ; Australian Research Council[DP200102121] ; National Natural Science Foundation of China[22171126]

Chemistry ; Materials Science

Chemistry, Multidisciplinary ; Materials Science, Multidisciplinary

WOS:000702854400003

ELSEVIER SCI LTD

20220311467200

Energy conversion ; Iridium compounds ; Light

Energy Conversion Issues:525.5 ; Light/Optics:741.1 ; Inorganic Compounds:804.2

Web of Science

1.City Univ Hong Kong, Sch Energy & Environm, Tat Chee Ave, Hong Kong, Peoples R China
2.Sci & Technol Surface Phys & Chem Lab, Jiangyou 621908, Peoples R China
3.Southern Univ Sci & Technol, Dept Chem, 1088 Tangchang Blvd, Shenzhen, Guangdong, Peoples R China
4.Shenzhen JL Computat Sci & Appl Res Inst, Shenzhen 518110, Peoples R China
5.Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China
6.Univ New South Wales, Sch Chem Engn, Sydney, NSW 2052, Australia
7.Univ Malaya, Ctr Separat Sci & Technol, Dept Chem Engn, Kuala Lumpur 50603, Malaysia

Wang, Chang-ting,Chen, Jinfan,Xu, Jiayuan,et al. Selective visible light reduction of carbon dioxide over iridium(III)-terpyridine photocatalysts[J]. Materials Today Chemistry,2021,22.

Wang, Chang-ting.,Chen, Jinfan.,Xu, Jiayuan.,Wei, Fangfang.,Yam, Chi Yung.,...&Teoh, Wey Yang.(2021).Selective visible light reduction of carbon dioxide over iridium(III)-terpyridine photocatalysts.Materials Today Chemistry,22.

Wang, Chang-ting,et al."Selective visible light reduction of carbon dioxide over iridium(III)-terpyridine photocatalysts".Materials Today Chemistry 22(2021).