Structural and electronic insight into the effect of indium doping on the photocatalytic performance of TiO2 for CO2 conversion

2021 ◽  
Author(s):  
Patricia Renones ◽  
Fernando Fresno ◽  
Giulio Gorni ◽  
Freddy Oropeza ◽  
Víctor Antonio Antonio de la Peña O'Shea
Keyword(s):  
Solar Energy ◽  
Co2 Emissions ◽  
Artificial Photosynthesis ◽  
Photocatalytic Performance ◽  
Co2 Conversion ◽  
Indium Doping ◽  
Insight Into

The photocatalytic conversion of CO2 to fuels and useful chemicals is a valuable artificial photosynthesis approach that simultaneously addresses the valorization of CO2 emissions and the storage of solar energy....

scholarly journals Solid-State Redox Kinetics of CeO2 in Two-Step Solar CH4 Partial Oxidation and Thermochemical CO2 Conversion

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 723
Author(s):  
Mahesh Muraleedharan Nair ◽  
Stéphane Abanades
Keyword(s):  
Solid State ◽  
Solar Energy ◽  
Kinetic Models ◽  
Oxygen Carrier ◽  
Co2 Conversion ◽  
Oxidation Reactions ◽  
Redox Kinetics ◽  
Concentrated Solar Energy ◽  
Ceria Reduction ◽  
Kinetics Of

The CeO2/CeO2−δ redox system occupies a unique position as an oxygen carrier in chemical looping processes for producing solar fuels, using concentrated solar energy. The two-step thermochemical ceria-based cycle for the production of synthesis gas from methane and solar energy, followed by CO2 splitting, was considered in this work. This topic concerns one of the emerging and most promising processes for the recycling and valorization of anthropogenic greenhouse gas emissions. The development of redox-active catalysts with enhanced efficiency for solar thermochemical fuel production and CO2 conversion is a highly demanding and challenging topic. The determination of redox reaction kinetics is crucial for process design and optimization. In this study, the solid-state redox kinetics of CeO2 in the two-step process with CH4 as the reducing agent and CO2 as the oxidizing agent was investigated in an original prototype solar thermogravimetric reactor equipped with a parabolic dish solar concentrator. In particular, the ceria reduction and re-oxidation reactions were carried out under isothermal conditions. Several solid-state kinetic models based on reaction order, nucleation, shrinking core, and diffusion were utilized for deducing the reaction mechanisms. It was observed that both ceria reduction with CH4 and re-oxidation with CO2 were best represented by a 2D nucleation and nuclei growth model under the applied conditions. The kinetic models exhibiting the best agreement with the experimental reaction data were used to estimate the kinetic parameters. The values of apparent activation energies (~80 kJ·mol−1 for reduction and ~10 kJ·mol−1 for re-oxidation) and pre-exponential factors (~2–9 s−1 for reduction and ~123–253 s−1 for re-oxidation) were obtained from the Arrhenius plots.

A size tunable bimetallic nickel-zinc nitride as a multi-functional co-catalyst on nitrogen doped titania boosts solar energy conversion

2020 ◽  
Vol 49 (15) ◽  
pp. 4887-4895 ◽  
Author(s):  
Weiliang Qi ◽  
Xiangjian Meng ◽  
Samira Adimi ◽  
Haichuan Guo ◽  
Tiju Thomas ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Photocatalytic Performance ◽  
Solar Energy Conversion ◽  
Co Catalyst ◽  
Nitrogen Doped ◽  
Nickel Zinc ◽  
Zinc Nitride ◽  
Doped Titania

N–TiO2–Ni3ZnN as a multi-functional photocatalyst exhibits efficient photocatalytic performance toward various reactions.

An insight into perovskite-based photocatalysts for artificial photosynthesis

2020 ◽  
Vol 4 (3) ◽  
pp. 973-984 ◽  
Author(s):  
Yee Wen Teh ◽  
Michell K. T. Chee ◽  
Xin Ying Kong ◽  
Siek-Ting Yong ◽  
Siang-Piao Chai
Keyword(s):  
Artificial Photosynthesis ◽  
Insight Into

Schematic illustration of perovskite-based photocatalysts for artificial photosynthesis.

scholarly journals Effect of Fe doping concentration on photocatalytic performance of CeO2 from DFT insight into analysis

AIP Advances ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 125341 ◽  
Author(s):  
Yufei Xue ◽  
Dong Tian ◽  
Chunhua Zeng ◽  
Yunchang Fu ◽  
Kongzhai Li
Keyword(s):  
Doping Concentration ◽  
Photocatalytic Performance ◽  
Fe Doping ◽  
Insight Into

scholarly journals CO2 conversion into methanol under ambient conditions using efficient nanocomposite photocatalyst/solar-energy materials in aqueous medium

RSC Advances ◽  
2020 ◽  
Vol 10 (26) ◽  
pp. 15072-15078 ◽  
Author(s):  
Mohsen Lashgari ◽  
Sanaz Soodi
Keyword(s):  
Solar Energy ◽  
Aqueous Medium ◽  
Co2 Conversion ◽  
Ambient Conditions ◽  
Energy Materials ◽  
Solar Energy Materials ◽  
Selective Conversion ◽  
Co2 Conversion Into Methanol ◽  
Hydrogenation Of Co

CNT-based nanocomposite photocatalyst/solar-energy materials serving as in situ hydrogen generators for selective conversion [hydrogenation] of CO2 into methanol: a mechanistic/photoelectrochemical outlook.

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