Chlorine‐Promoted Nitrogen and Sulfur Co‐Doped Biocarbon Catalyst for Electrochemical Carbon Dioxide Reduction

2020 ◽  
Vol 7 (1) ◽  
pp. 320-327 ◽  
Author(s):  
Xiaosen Cai ◽  
Binhao Qin ◽  
Yuhang Li ◽  
Qiao Zhang ◽  
Guangxing Yang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Reduction ◽  
Co Doped

scholarly journals Microwave-Assisted Solvothermal Synthesis of Chalcogenide Composite Photocatalyst and Its Photocatalytic CO2 Reduction Activity under Simulated Solar Light

Catalysts ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 789
Author(s):  
Gang-Juan Lee ◽  
Yu-Hong Hou ◽  
Hsin-Ting Huang ◽  
Wenmin Wang ◽  
Cong Lyu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Photocatalytic Activity ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Photoluminescence Intensity ◽  
Composite Photocatalyst ◽  
Microwave Assisted ◽  
Reduction Activity ◽  
Operation Conditions ◽  
Co Doped

A novel heterostructure consisting of Ru and Cu co-doped ZnS nanopowders (RCZS) into a MoS2-graphene hybrid (MSG) is successfully prepared by the microwave-assisted solvothermal approach. RCZS nanopowders are fabricated on the surface of MSG, which produces a nanoscale interfacial between RCZS and MSG. As the photo-excited electrons of RCZS can easily migrate to MoS2 through graphene by hindering the electron and hole (e– and h+) recombination, the photocatalytic activity could be improved by effective charge transfer. As RCZS are anchored onto the MSG, the photoluminescence intensity of the chalcogenide composite photocatalyst obviously decreases. In addition, a quaternary ruthenium and copper-based chalcogenide RCZS/MSG is able to improve the harvest and utilization of light. With the increase in the concentrations of Ru until 4 mol%, the band gap significantly decreases from 3.52 to 2.73 eV. At the same time, moderate modification by ruthenium can decrease the PL intensity compared to the pristine CZS/MSG sample, which indicates the enhancement of e– and h+ separation by Ru addition. The photocatalytic activity of as-synthesized chalcogenide composite photocatalysts is evaluated by the photocatalytic carbon dioxide reduction. Optimized operation conditions for carbon dioxide reduction have been performed, including the concentration of NaOH solution, the amount of RCZS/MSG photocatalyst, and the content of co-doped ruthenium. The doping of ruthenium would efficiently improve the performance of the photocatalytic activity for carbon dioxide reduction. The optimal conditions, such as the concentration of 2 M NaOH and the 0.5RCZS/MSG dosage of 0.05 g L–1, provide the maximum methane gas yield of 58.6 μmol h−1 g–1.

Fundamentals, On-Going Advances and Challenges of Electrochemical Carbon Dioxide Reduction

2021 ◽  
Author(s):  
Zongkui Kou ◽  
Xin Li ◽  
Tingting Wang ◽  
Yuanyuan Ma ◽  
Wenjie Zang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Reduction

scholarly journals Turning Carbon Dioxide and Ethane into Ethanol by Solar-Driven Heterogeneous Photocatalysis over RuO2- and NiO-co-Doped SrTiO3

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 461
Author(s):  
Larissa O. Paulista ◽  
Josep Albero ◽  
Ramiro J. E. Martins ◽  
Rui A. R. Boaventura ◽  
Vítor J. P. Vilar ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Maximum Yield ◽  
Ruthenium Oxide ◽  
Photogenerated Electron ◽  
Band Gap Energy ◽  
Heterogeneous Photocatalysis ◽  
Solar Irradiation ◽  
Batch Mode ◽  
Molar Ratios ◽  
Co Doped

The current work focused on the sunlight-driven thermo-photocatalytic reduction of carbon dioxide (CO2), the primary greenhouse gas, by ethane (C2H6), the second most abundant element in shale gas, aiming at the generation of ethanol (EtOH), a renewable fuel. To promote this process, a hybrid catalyst was prepared and properly characterized, comprising of strontium titanate (SrTiO3) co-doped with ruthenium oxide (RuO2) and nickel oxide (NiO). The photocatalytic activity towards EtOH production was assessed in batch-mode and at gas-phase, under the influence of different conditions: (i) dopant loading; (ii) temperature; (iii) optical radiation wavelength; (vi) consecutive uses; and (v) electron scavenger addition. From the results here obtained, it was found that: (i) the functionalization of the SrTiO3 with RuO2 and NiO allows the visible light harvest and narrows the band gap energy (ca. 14–20%); (ii) the selectivity towards EtOH depends on the presence of Ni and irradiation; (iii) the catalyst photoresponse is mainly due to the visible photons; (iv) the photocatalyst loses > 50% efficiency right after the 2nd use; (v) the reaction mechanism is based on the photogenerated electron-hole pair charge separation; and (vi) a maximum yield of 64 μmol EtOH gcat−1 was obtained after 45-min (85 μmol EtOH gcat−1 h−1) of simulated solar irradiation (1000 W m−2) at 200 °C, using 0.4 g L−1 of SrTiO3:RuO2:NiO (0.8 wt.% Ru) with [CO2]:[C2H6] and [Ru]:[Ni] molar ratios of 1:3 and 1:1, respectively. Notwithstanding, despite its exploratory nature, this study offers an alternative route to solar fuels’ synthesis from the underutilized C2H6 and CO2.

Nitrogen and boron co‐doped carbon spheres for carbon dioxide electroreduction

ChemNanoMat ◽  
2021 ◽  
Author(s):  
Chunfeng Cheng ◽  
Jiaqi Shao ◽  
Pengfei Wei ◽  
Yanpeng Song ◽  
Hefei Li ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Spheres ◽  
Co Doped ◽  
Carbon Dioxide Electroreduction
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