NDLI: Unravelling the pH-dependence of a molecular photocatalytic system for hydrogen production

Content Provider	Royal Society of Chemistry (RSC)
Author	Selim, Shababa Durrant, James R. Reisner, Erwin Pastor, Ernest Reynal, Anna Gross, Manuela A.
Copyright Year	2015
Abstract	Photocatalytic systems for the reduction of aqueous protons are strongly pH-dependent, but the origin of this dependency is still not fully understood. We have studied the effect of different degrees of acidity on the electron transfer dynamics and catalysis taking place in a homogeneous photocatalytic system composed of a phosphonated ruthenium tris(bipyridine) dye (RuP) and a nickel bis(diphosphine) electrocatalyst (NiP) in an aqueous ascorbic acid solution. Our approach is based on transient absorption spectroscopy studies of the efficiency of photo-reduction of RuP and NiP correlated with pH-dependent photocatalytic H2 production and the degree of catalyst protonation. The influence of these factors results in an observed optimum photoactivity at pH 4.5 for the RuP–NiP system. The electron transfer from photo-reduced RuP to NiP is efficient and independent of the pH value of the medium. At pH <4.5, the efficiency of the system is limited by the yield of RuP photo-reduction by the sacrificial electron donor, ascorbic acid. At pH >4.5, the efficiency of the system is limited by the poor protonation of NiP, which inhibits its ability to reduce protons to hydrogen. We have therefore developed a rational strategy utilising transient absorption spectroscopy combined with bulk pH titration, electrocatalytic and photocatalytic experiments to disentangle the complex pH-dependent activity of the homogenous RuP–NiP photocatalytic system, which can be widely applied to other photocatalytic systems.
Starting Page	4855
Ending Page	4859
Page Count	5
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	6
Issue Number	8
Journal	Chemical Science
DOI	10.1039/c5sc01349f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Absorption spectroscopy Dye Acid Ruthenium Hydrogen Bipyridine Redox Nickel Diphosphane Titration
Content Type	Text
Resource Type	Article
Subject	Chemistry

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Unraveling the pH-dependence of a molecular photocatalytic system for hydrogen production

Effect of bulky groups in ruthenium heteroleptic sensitizers on dye sensitized solar cell performance

H-dependence of a molecular photocatalytic system for hydrogen production†

Redox-triggered chiroptical switching activity of ruthenium(III)-bis-(β-diketonato) complexes bearing a bipyridine-helicene ligand

High molar extinction coefficient amphiphilic ruthenium sensitizers for efficient and stable mesoscopic dye-sensitized solar cells

A nickel complex of a conjugated bis-dithiocarbazate Schiff base for the photocatalytic production of hydrogen

An organic redox mediator for dye-sensitized solar cells with near unity quantum efficiency

Ruthenium II complexes of bipyridine functionalized molecular clips redox properties and DNA interactions

Solar H₂ evolution in water with modified diketopyrrolopyrrole dyes immobilised on molecular Co and Ni catalyst–TiO₂ hybrids

Unravelling the pH-dependence of a molecular photocatalytic system for hydrogen production

Similar Documents

Unraveling the pH-dependence of a molecular photocatalytic system for hydrogen production

Effect of bulky groups in ruthenium heteroleptic sensitizers on dye sensitized solar cell performance

H-dependence of a molecular photocatalytic system for hydrogen production†

Redox-triggered chiroptical switching activity of ruthenium(III)-bis-(β-diketonato) complexes bearing a bipyridine-helicene ligand

High molar extinction coefficient amphiphilic ruthenium sensitizers for efficient and stable mesoscopic dye-sensitized solar cells

A nickel complex of a conjugated bis-dithiocarbazate Schiff base for the photocatalytic production of hydrogen

An organic redox mediator for dye-sensitized solar cells with near unity quantum efficiency

Ruthenium II complexes of bipyridine functionalized molecular clips redox properties and DNA interactions

Solar H2 evolution in water with modified diketopyrrolopyrrole dyes immobilised on molecular Co and Ni catalyst–TiO2 hybrids

Unravelling the pH-dependence of a molecular photocatalytic system for hydrogen production

Solar H₂ evolution in water with modified diketopyrrolopyrrole dyes immobilised on molecular Co and Ni catalyst–TiO₂ hybrids