Cu supported on polymeric carbon nitride for selective CO2 reduction into CH4: a combined kinetics and thermodynamics investigation

2019 ◽  
Vol 7 (28) ◽  
pp. 17014-17021 ◽  
Author(s):  
Jieyuan Li ◽  
Ping Yan ◽  
Kanglu Li ◽  
Junjie You ◽  
Hong Wang ◽  
...  
Keyword(s):  
Catalytic Reaction ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Reduction Reaction ◽  
Kinetics And Thermodynamics ◽  
Polymeric Carbon

Metal-based cocatalysts have been widely applied in the photocatalytic CO2 reduction reaction (CO2RR) and the integration of cocatalysts/semiconductors is expected to enhance the selectivity of the catalytic reaction.

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 Tailoring the Grain Boundary Chemistry of Polymeric Carbon Nitride for Enhanced Solar Hydrogen Production and CO2 Reduction

2019 ◽  
Vol 131 (11) ◽  
pp. 3471-3475 ◽  
Author(s):  
Guigang Zhang ◽  
Guosheng Li ◽  
Tobias Heil ◽  
Spiros Zafeiratos ◽  
Feili Lai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Grain Boundary ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Solar Hydrogen ◽  
Solar Hydrogen Production ◽  
Boundary Chemistry ◽  
Polymeric Carbon

scholarly journals Conjugated Electron Donor–Acceptor Hybrid Polymeric Carbon Nitride as a Photocatalyst for CO2 Reduction

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1779 ◽  
Author(s):  
Asif Hayat ◽  
Mati Ur Rahman ◽  
Iltaf Khan ◽  
Javid Khan ◽  
Muhammad Sohail ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Molecular Orbital ◽  
Density Functional ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Characterization Methods ◽  
Base Functions ◽  
Activity Performance ◽  
Donor Acceptor ◽  
Polymeric Carbon

This work incorporates a variety of conjugated donor-acceptor (DA) co-monomers such as 2,6-diaminopurine (DP) into the structure of a polymeric carbon nitride (PCN) backbone using a unique nanostructure co-polymerization strategy and examines its photocatalytic activity performance in the field of photocatalytic CO2 reduction to CO and H2 under visible light irradiation. The as-synthesized samples were successfully analyzed using different characterization methods to explain their electronic and optical properties, crystal phase, microstructure, and their morphology that influenced the performance due to the interactions between the PCN and the DPco-monomer. Based on the density functional theory (DFT) calculation result, pure PCN and CNU-DP15.0 trimers (interpreted as incorporation of the co-monomer at two different positions) were extensively evaluated and exhibited remarkable structural optimization without the inclusion of any symmetry constraints (the non-modified sample derived from urea, named as CNU), and their optical and electronic properties were also manipulated to control occupation of their respective highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO). Also, co-polymerization of the donor–acceptor 2,6-diamino-purine co-monomer with PCN influenced the chemical affinities, polarities, and acid–base functions of the PCN, remarkably enhancing the photocatalytic activity for the production of CO and H2 from CO2 by 15.02-fold compared than that of the parental CNU, while also improving the selectivity.

scholarly journals Mechanistic analysis of multiple processes controlling solar-driven H2O2 synthesis using engineered polymeric carbon nitride

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yubao Zhao ◽  
Peng Zhang ◽  
Zhenchun Yang ◽  
Lina Li ◽  
Jingyu Gao ◽  
...  
Keyword(s):  
Active Sites ◽  
Carbon Nitride ◽  
Separation Efficiency ◽  
Structural Features ◽  
Reduction Reaction ◽  
Transformation Process ◽  
Photon Absorption ◽  
Apparent Quantum Yield ◽  
Dioxygen Reduction ◽  
Polymeric Carbon

AbstractSolar-driven hydrogen peroxide (H2O2) production presents unique merits of sustainability and environmental friendliness. Herein, efficient solar-driven H2O2 production through dioxygen reduction is achieved by employing polymeric carbon nitride framework with sodium cyanaminate moiety, affording a H2O2 production rate of 18.7 μmol h −1 mg−1 and an apparent quantum yield of 27.6% at 380 nm. The overall photocatalytic transformation process is systematically analyzed, and some previously unknown structural features and interactions are substantiated via experimental and theoretical methods. The structural features of cyanamino group and pyridinic nitrogen-coordinated soidum in the framework promote photon absorption, alter the energy landscape of the framework and improve charge separation efficiency, enhance surface adsorption of dioxygen, and create selective 2e− oxygen reduction reaction surface-active sites. Particularly, an electronic coupling interaction between O2 and surface, which boosts the population and prolongs the lifetime of the active shallow-trapped electrons, is experimentally substantiated.

Edge activation of an inert polymeric carbon nitride matrix with boosted absorption kinetics and near-infrared response for efficient photocatalytic CO2 reduction

2020 ◽  
Vol 8 (23) ◽  
pp. 11761-11772 ◽  
Author(s):  
Qiong Liu ◽  
Zhongxin Chen ◽  
Weijian Tao ◽  
Haiming Zhu ◽  
Linxin Zhong ◽  
...  
Keyword(s):  
Activation Energy ◽  
Energy Barrier ◽  
Carbon Nitride ◽  
Near Infrared ◽  
Co2 Reduction ◽  
Absorption Capacity ◽  
Absorption Kinetics ◽  
Activation Energy Barrier ◽  
Polymeric Carbon

The edge-activation of the polymeric carbon nitride matrix by hydroxyethyl groups results in enhanced CO2 absorption capacity and decrease in the CO2 activation energy barrier.

scholarly journals Pyrene-functionalized polymeric carbon nitride with promoted aqueous–organic biphasic photocatalytic CO2 reduction

2019 ◽  
Vol 7 (13) ◽  
pp. 7373-7379 ◽  
Author(s):  
Xuezhong Gong ◽  
Sijia Yu ◽  
Meili Guan ◽  
Xianglin Zhu ◽  
Can Xue
Keyword(s):  
Aqueous Solution ◽  
Organic Phase ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Alkene Oxidation ◽  
Polymeric Carbon

Covalently grafting pyrene groups on polymeric carbon nitride enables photocatalytic CO2 reduction in aqueous solution with simultaneous alkene oxidation in organic phase.

Probing the effect of P-doping in polymeric carbon nitride on CO2 photocatalytic reduction

2020 ◽  
Vol 49 (44) ◽  
pp. 15750-15757
Author(s):  
Yangkun Guo ◽  
Min Wang ◽  
Jianjian Tian ◽  
Meng Shen ◽  
Lingxia Zhang ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
Reduction Reaction ◽  
Photocatalytic Reduction ◽  
Polymeric Carbon

P-Doping promotes the generation and conversion of CO2− intermediate on polymeric carbon nitride photocatalysts during CO2 reduction reaction.

Regulating morphological and electronic structures of polymeric carbon nitrides by successive copolymerization and stream reforming for photocatalytic CO2 reduction

2021 ◽  
Author(s):  
Ruirui Wang ◽  
Pengju Yang ◽  
Sibo Wang ◽  
Xinchen Wang
Keyword(s):  
Electronic Structures ◽  
Carbon Nitride ◽  
Co2 Reduction ◽  
Carbon Nitrides ◽  
Polymeric Carbon

Greatly reinforced photocatalytic CO2 reduction is realized with carbon nitride polymers tailored via a coupled copolymerization and stream reforming strategy.

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