The room temperature electrochemical synthesis of N-doped graphene and its electrocatalytic activity for oxygen reduction

2015 ◽  
Vol 51 (7) ◽  
pp. 1198-1201 ◽  
Author(s):  
Feng-Xiang Ma ◽  
Jiong Wang ◽  
Feng-Bin Wang ◽  
Xing-Hua Xia
Keyword(s):  
Oxygen Reduction ◽  
Electrochemical Synthesis ◽  
Electrocatalytic Activity ◽  
Active Sites ◽  
Room Temperature ◽  
N Source ◽  
N Doping ◽  
Doped Graphene ◽  
Electrochemical Energy

N doping in graphene can be achieved using a facile and mild approach using electrochemical energy at room temperature with ammonia as the N source, which occurs at the carbon active sites generated in situ during the removal of oxygen containing species at cathodic potentials.

scholarly journals Marginal defects modified graphene with S-C-N-C groups for highly selective oxygen reduction to H2O2

2021 ◽  
Author(s):  
Zhixing Mou ◽  
Yue-Wen Mu ◽  
Lijia Liu ◽  
Daili Cao ◽  
Shuai Chen ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Oxygen Reduction ◽  
Self Assembly ◽  
Active Sites ◽  
Functional Group ◽  
H2o2 Production ◽  
Sulfur Source ◽  
Highly Active ◽  
Slow Kinetics ◽  
Doped Graphene

Abstract Developing efficient metal-free catalysts to achieve electrochemical synthesis of hydrogen peroxide (H2O2) is crucial for substituting traditional energy-intensive anthraquinone process. Heteroatom-doped carbon materials have shown great potential toward 2e-pathway for catalyzing oxygen reduction to hydrogen peroxide (ORHP). However, conventional nanocarbon electrocatalysts show slow kinetics toward ORHP due to the weak binding strength with OOH* intermediate, resulting reduction of O2 to H2O. Here, sulfur and nitrogen dual-doped graphene (SNC) electrocatalyst consisting of S-C-N-C functional group are synthesized through hydrothermal self-assembly and nitridation processes with thiourea as sulfur source. In S-C-N-C functional group, pentagon-S and pyrrolic-N are covalently grafted onto the edge of graphene and produce marginal carbon ring defects, which provide highly active sites for catalyzing ORHP. The obtained SNC catalysts deliver an outstanding ORHP activity and selectivity for H2O2 production, while retaining remarkable stability. The experimental and computational results reveal that marginal S-C-N-C functional groups afford an appropriate adsorption strength with OOH* intermediate and a low reaction barrier as well, which are essential for the activity of ORHP.

Distorted niobium-self-doped graphene in-situ grown from 2D niobium carbide for catalyzing oxygen reduction

Carbon ◽  
2018 ◽  
Vol 139 ◽  
pp. 1144-1151 ◽  
Author(s):  
Wenqiang Li ◽  
Ibrahim Saana Amiinu ◽  
Bingwen Zhang ◽  
Chengtian Zhang ◽  
Zhiwei Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction ◽  
Niobium Carbide ◽  
Doped Graphene
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