View : 18 Download: 0

Visible-Light-Driven Photoproduction of Hydrogen Using Rhodium Catalysts and Platinum Nanoparticles with Formate

Title
Visible-Light-Driven Photoproduction of Hydrogen Using Rhodium Catalysts and Platinum Nanoparticles with Formate
Authors
Kim, SoojinLee, Ga YeBaeg, Jin-OokKim, YoungmeeKim, Sung-JinKim, Jinheung
Ewha Authors
김성진김영미김진흥
SCOPUS Author ID
김성진scopus; 김영미scopus; 김진흥scopus
Issue Date
2014
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY C
ISSN
1932-7447JCR Link
Citation
vol. 118, no. 45, pp. 25844 - 25852
Publisher
AMER CHEMICAL SOC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Photochemical hydrogen production is carried out using molecular Rh complexes and sodium formate in the presence of platinum nanoparticles (PtNPs) in aqueous buffer solution. Visible-light-driven photocatalytic reactions for hydrogen production with and without nicotinamide adenine dinucleotide (NAD(+)) follow two different pathways. Complex [Cp*Rh(bpy)(OH2)](2+) selectively reduces NAD(+) to generate NADH using formate as a proton and electron donor and the chemically generated NADH is sequentially used by PtNPs upon photoactivation of eosin Y to produce hydrogen. However, hydrogen is also produced in photoreactions of the Rh catalyst and PtNPs with formate in the absence of NAD(+) and eosin Y. The second pathway for hydrogen production was performed under the conditions without NAD(+) and eosin Y and derived from a direct electron transfer from in situ generated rhodium(III)-hydride species to photoexcited PtNPs. The direct electron transfer from the rhodium-hydride species to visible-light-driven PtNPs was first observed in this study. These two pathways for hydrogen production showed different rate-limiting steps based on a Hammett plot using Rh catalysts containing electron-donating and electron-withdrawing groups. Kinetic isotope effects as well as Hammett plot supported the rate-limiting step of the NADH generation for the first pathway of hydrogen production and the RhH formation for the second pathway.
DOI
10.1021/jp504876w
Appears in Collections:
자연과학대학 > 화학·나노과학전공 > Journal papers
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE