A solar cell driven electrochemical process for the concurrent reduction of carbon dioxide and degradation of azo dye in dilute KHCO3 electrolyte

Efficient Electrochemical CO2 Conversion Powered by Renewable Energy

“…Figure 1 illustrates that viable electrochemical CO2 conversion technologies must integrate with carbon-free energy; however, very few reports have characterized renewably-powered CO2 conversion processes, the catalysts that can be utilized, or how these processes can be interfaced with carbon-friendly energy sources. [34][35][36][37] This manuscript describes the development and characterization of a renewably-powered electrocatalytic CO2 conversion system. We utilize ligand-protected Au25 (SC2H4Ph)18 nanoclusters (abbreviated Au25) as an extremely active and selective CO2RR catalyst.…”

Solar cell driven electrochemical process for the reduction of CO 2 to HCOOH on Zn and Sn electrocatalysts

“…The optimized condition for high CO 2 conversion is 430 lmol for 10 min. It was reported that the reduction of CO 2 to HCOOH using solar energy in 0.1 M KHCO 3 electrolyte on Cu catalyst and different products like HCOOH, HCHO and CH 3 OH were reported with current efficiency of HCOOH is 0.69% after 1 h reaction (Peng et al, 2013). The CO 2 reduction in 0.4 M solution shows better reduction rate, but less compared to reaction in 0.2 M electrolyte solution.…”

“…Reduction of CO 2 using solar energy was studied in 0.1 M KHCO 3 solution on copper catalyst as cathode and Pt as anode. Different products like methanol, methane formaldehyde and formic acid were reported (Peng et al, 2013). The photochemical reduction of CO 2 on Zn based catalyst was also reported using Pt catalyst Nunez et al, 2013).…”

Photoelectrochemical Reactors for CO2 Utilization

“…11 CO2 can be converted to a wide range of products such as CO, H2, HCOOH, CH3OH, CH4, etc. 12 Equations 1-5 shows the thermodynamic potentials for CO2 reduction products at neutral pH in aqueous solution versus a saturated calomel electrode (SCE) and • C and atmospheric pressure: 13 CO2 + 2H + + 2e − → CO + H2O E • = −0.77V (1) CO2 + 2H + + 2e − → HCOOH E • = −0.85V (2) CO2 + 6H + + 6e − → CH3OH + H2O E • = −0.62V 3CO2 + 8H + + 8e − → CH4 + 2H2O E • = −0.48V (4) CO2 + e − → CO2 •− E• = −2.14V (5) The extent to which the reaction progresses depends mainly on the catalytic systems, as well as the reaction media and potential applied. 12 Typically, multiple proton coupled electron transfer steps must be orchestrated, presenting kinetic barriers to the forward reaction.…”

“…However, due to the chemical properties of CO2, its transformation requires a high level of energy since the bond dissociation energy of C=O is ~750 kJ•mol −1 , higher than other chemical bonds such as C−H (~430 kJ•mol −1 ) and C−C (~336 kJ•mol −1 ). 1 Nowadays, there are several technologies able to chemically reduce CO2 to value added products. Among them: thermochemical processes (i.e.…”