Reduction of Carbon Dioxide: Photo-Catalytic Route to Solar Fuels

Viswanathan, B.

doi:10.1007/978-1-4939-1628-3_11

Materials and Processes for Solar Fuel Production

2014

DOI: 10.1007/978-1-4939-1628-3_11

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Reduction of Carbon Dioxide: Photo-Catalytic Route to Solar Fuels

B. Viswanathan

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Cited by 2 publications

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Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

2015

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The creation of systems that efficiently interconvert chemical and electrical energies will be aided by understanding proton-coupled electron transfers at solution-semiconductor interfaces. Steps in developing that understanding are described here through kinetic studies of reactions of photoreduced colloidal zinc oxide (ZnO) nanocrystals (NCs) with the nitroxyl radical TEMPO. These reactions proceed by proton-coupled electron transfer (PCET) to give the hydroxylamine TEMPOH. They occur on the submillisecond to seconds time scale, as monitored by stopped-flow optical spectroscopy. Under conditions of excess TEMPO, the reactions are multiexponential in character. One of the contributors to this multiexponential kinetics may be a distribution of reactive proton sites. A graphical overlay method shows the reaction to be first order in [TEMPO]. Different electron concentrations in otherwise identical NC samples were achieved by three different methods: differing photolysis times, premixing with an unphotolyzed sample, or prereaction with TEMPO. The reaction velocities were consistently higher for NCs with higher numbers of electrons. For instance, NCs with an average of 2.6 e(-)/NC reacted faster than otherwise identical samples containing ≤1 e(-)/NC. Surprisingly, NC samples with the same average number of electrons but prepared in different ways often had different reaction profiles. These results show that properties beyond electron content determine PCET reactivity of the particles.

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Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

2015

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Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO₂

Kadosh

Korin

Bettelheim

2021

Sustainable Energy Fuels

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Reduction of Carbon Dioxide: Photo-Catalytic Route to Solar Fuels

Cited by 2 publications

References 49 publications

Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO₂

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Reduction of Carbon Dioxide: Photo-Catalytic Route to Solar Fuels

Cited by 2 publications

References 49 publications

Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

Reaction Dynamics of Proton-Coupled Electron Transfer from Reduced ZnO Nanocrystals

Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO2

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Product

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Room-temperature conversion of the photoelectrochemical oxidation of methane into electricity at nanostructured TiO₂