scholarly journals Novel homogeneous selective electrocatalysts for CO2 reduction: an electrochemical and computational study of cyclopentadienyl-phenylendiamino-cobalt complexes

2020 ◽  
Vol 4 (11) ◽  
pp. 5609-5617
Author(s):  
Nicola Melis ◽  
Francesca Mocci ◽  
Annalisa Vacca ◽  
Luca Pilia
Keyword(s):  
Hydrogen Evolution ◽  
Computational Study ◽  
Co2 Reduction ◽  
Cobalt Complexes ◽  
Catalytic Current

Cobalt cyclopentadienyl phenylendiamine complexes are revealed to be efficient and selective electrocatalysts for CO2 reduction, resulting in a 31-fold catalytic current without the hydrogen evolution.

Cobaloxime-Based Double Complex Salts as Efficient and Versatile Catalysts for the Light-Driven Hydrogen Evolution Reaction

2020 ◽  
Author(s):  
Elisabeth Hofmeister ◽  
Jisoo Woo ◽  
Tobias Ullrich ◽  
Lydia Petermann ◽  
Kevin Hanus ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Systematic Study ◽  
Cobalt Complexes ◽  
Spectroscopic Studies ◽  
Double Complex ◽  
Double Complex Salts ◽  
Noble Metal Catalysts ◽  
Reduction Potentials ◽  
Complex Salts

Cobaloximes and their BF<sub>2</sub>-bridged analogues have emerged as promising non-noble metal catalysts for the photocatalytic hydrogen evolution reaction (HER). Herein we report the serendipitous discovery that double complex salts such as [Co(dmgh)<sub>2</sub>py<sub>2</sub>]<sup>+</sup>[Co(dmgBPh<sub>2</sub>)<sub>2</sub>Cl<sub>2</sub>]<sup>-</sup> can be obtained in good yields by treatment of commercially available [Co(dmgh)<sub>2</sub>pyCl] with triarylboranes. A systematic study on the use of such double complex salts and their single salts with simple counterions as photocatalysts revealed HER activities comparable or superior to existing cobaloxime catalysts and suggests ample opportunities for this compound class in catalyst/photosensitizer dyads and immobilized architectures. Preliminary electrochemical and spectroscopic studies indicate that one key advantage of these charged cobalt complexes is that the reduction potentials as well as the electrostatic interaction with charged photosensitizers can be tuned.

Carbon nitride derivatives as photocatalysts for the CO2 reduction reaction: computational study

2021 ◽  
Vol 23 (5) ◽  
pp. 3401-3406
Author(s):  
Siru Li ◽  
Yu Tian ◽  
Likai Yan ◽  
Zhongmin Su
Keyword(s):  
Carbon Nitride ◽  
Computational Study ◽  
Co2 Reduction ◽  
Environmental Problems ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Energy Crisis ◽  
Promising Strategy ◽  
Co2 Reduction Reaction

Photocatalytic reduction of CO2 to hydrocarbons is considered to be a promising strategy to solve the energy crisis and environmental problems.

scholarly journals A high throughput optical method for studying compositional effects in electrocatalysts for CO2 reduction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jeremy L. Hitt ◽  
Yuguang C. Li ◽  
Songsheng Tao ◽  
Zhifei Yan ◽  
Yue Gao ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
High Throughput ◽  
High Throughput Screening ◽  
Screening Method ◽  
Co2 Reduction ◽  
Fold Increase ◽  
Faradaic Efficiency ◽  
Atomic Pair Distribution Function ◽  
Earth Abundant ◽  
Ternary Catalysts

AbstractIn the problem of electrochemical CO2 reduction, the discovery of earth-abundant, efficient, and selective catalysts is essential to enabling technology that can contribute to a carbon-neutral energy cycle. In this study, we adapt an optical high throughput screening method to study multi-metallic catalysts for CO2 electroreduction. We demonstrate the utility of the method by constructing catalytic activity maps of different alloyed elements and use X-ray scattering analysis by the atomic pair distribution function (PDF) method to gain insight into the structures of the most active compositions. Among combinations of four elements (Au, Ag, Cu, Zn), Au6Ag2Cu2 and Au4Zn3Cu3 were identified as the most active compositions in their respective ternaries. These ternary electrocatalysts were more active than any binary combination, and a ca. 5-fold increase in current density at potentials of −0.4 to −0.8 V vs. RHE was obtained for the best ternary catalysts relative to Au prepared by the same method. Tafel plots of electrochemical data for CO2 reduction and hydrogen evolution indicate that the ternary catalysts, despite their higher surface area, are poorer catalysts for the hydrogen evolution reaction than pure Au. This results in high Faradaic efficiency for CO2 reduction to CO.

Metal-Free Fluorine-Doped Carbon Electrocatalyst for CO2 Reduction Outcompeting Hydrogen Evolution

2018 ◽  
Vol 130 (31) ◽  
pp. 9788-9792 ◽  
Author(s):  
Jiafang Xie ◽  
Xiaotao Zhao ◽  
Maoxiang Wu ◽  
Qiaohong Li ◽  
Yaobing Wang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Co2 Reduction ◽  
Metal Free

Enhancing CO2 reduction by suppressing hydrogen evolution with polytetrafluoroethylene protected copper nanoneedles

2020 ◽  
Vol 8 (31) ◽  
pp. 15936-15941 ◽  
Author(s):  
Pengda An ◽  
Lai Wei ◽  
Huangjingwei Li ◽  
Baopeng Yang ◽  
Kang Liu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Hydrogen Evolution ◽  
Co2 Reduction ◽  
Carbon Dioxide Reduction ◽  
Reduction Reaction

Enhanced carbon dioxide reduction reaction (CO2RR) with suppressed HER was achieved on polytetrafluoroethylene (PTFE) coated Cu nanoneedles (CuNNs).

MXenes: Applications in electrocatalytic, photocatalytic hydrogen evolution reaction and CO2 reduction

2020 ◽  
Vol 486 ◽  
pp. 110850 ◽  
Author(s):  
Thang Phan Nguyen ◽  
Dinh Minh Tuan Nguyen ◽  
Dai Lam Tran ◽  
Hai Khoa Le ◽  
Dai-Viet N. Vo ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Co2 Reduction ◽  
Photocatalytic Hydrogen Evolution
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