Synthesis of TiO2/RGO with plasmonic Ag nanoparticles for highly efficient photoelectrocatalytic reduction of CO2 to methanol toward the removal of an organic pollutant from the atmosphere
- Bharath, G.; Prakash, J.; Rambabu, K.; Venkatasubbu, G. Devanand; Kumar, Ashok; Lee, Seungjun; Theerthagiri, Jayaraman; Choi, Myong Yong; Banat, Fawzi
- Issue Date
- ELSEVIER SCI LTD
- Plasmonics; Heterogeneous electrocatalysts; Photocathode; CO2 reduction; Methanol; Sustainable liquid fuels
- ENVIRONMENTAL POLLUTION, v.281
- Journal Title
- ENVIRONMENTAL POLLUTION
- The synergistic photoelectrochemical (PEC) technology is a robust process for the conversion of CO2 into fuels. However, designing a highly efficient UV-visible driven photoelectrocatalyst is still challenging. Herein, a plasmonic Ag NPs modified TiO2/RGO photoelectrocatalyst (Ag-TiO2/RGO) has been designed for the PEC CO2 reduction into selective production of CH3OH. HR-TEM analysis revealed that Ag and TiO2 NPs with average sizes of 4 and 7 nm, respectively, were densely grown on the few-micron-sized 2D RGO nanosheets. The physicochemical analysis was used to determine the optical and textural properties of the Ag-TiO2/RGO nanohybrids. Under VU-Vis light illumination, Ag-TiO2/RGO photocathode possessed a current density of 23.5 mA cm(-2) and a lower electrode resistance value of 125 Omega in CO2-saturated 1.0 M KOH-aqueous electrolyte solution. Catalytic studies showed that the Ag-TiO2/RGO photocathode possessed a remarkable PEC CO2 reduction activity and selective production of CH3OH with a yield of 85 timol L-1 cm(-2), the quantum efficiency of 20% and Faradic efficiency of 60.5% at onset potential of -0.7 V. A plausible PEC CO2 reduction mechanism over Ag-TiO2/RGO photocathode is schematically demonstrated. The present work gives a new avenue to develop high-performance and stable photoelectrocatalyst for PEC CO2 reduction towards sustainable liquid fuels production. (C) 2021 Elsevier Ltd. All rights reserved.
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- 자연과학대학 > 화학과 > Journal Articles
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