Photoelectrochemical CO2 reduction using a Ru(ii)–Re(i) multinuclear metal complex on a p-type semiconducting NiO electrode

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Abstract

A photocathode for CO ₂ reduction was developed using a hybrid comprising a Ru( ii)–Re( i) supramolecular photocatalyst and a NiO electrode. Photoexcitation of the Ru photosensitizer selectively gave CO with high faradaic efficiency.

A photocathode for CO ₂ reduction was successfully developed using a hybrid electrode comprising a Ru( ii)–Re( i) supramolecular photocatalyst and a NiO electrode. Selective photoexcitation of the Ru photosensitizer unit of the photocatalyst at −1.2 V vs. Ag/AgNO ₃ selectively afforded CO with high faradaic efficiency.

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Artificial Z-Scheme Constructed with a Supramolecular Metal Complex and Semiconductor for the Photocatalytic Reduction of CO2

Keita Sekizawa, Kazuhiko Maeda, Kazunari Domen … (2013)

A hybrid for the visible-light-driven photocatalytic reduction of CO2 using methanol as a reducing agent was developed by combining two different types of photocatalysts: a Ru(II) dinuclear complex (RuBLRu′) used for CO2 reduction is adsorbed onto Ag-loaded TaON (Ag/TaON) for methanol oxidation. Isotope experiments clearly showed that this hybrid photocatalyst mainly produced HCOOH (TN = 41 for 9 h irradiation) from CO2 and HCHO from methanol. Therefore, it converted light energy into chemical energy (ΔG° = +83.0 kJ/mol). Photocatalytic reaction proceeds by the stepwise excitation of Ag/TaON and the Ru dinuclear complex on Ag/TaON, similar to the photosynthesis Z-scheme.