active sites of nitrogen-doped carbon materials for

[PDF] Enhancing Electrocatalytic Oxygen Reduction on

The shortage of nitrogen active sites and relatively low nitrogen content result in unsatisfying eletrocatalytic activity and durability of nitrogen-doped graphene (NG) for oxygen reduction reaction (ORR). Here we report a novel approach to substantially enhance electrocatalytic oxygen reduction on NG electrode by the implantation of nitrogen active sites with mesoporous graphitic carbon

[1410.7529] Observation of Active Sites for Oxygen

2014/10/28Active sites and catalytic mechanism of nitrogen-doped graphene in oxygen reduction reaction (ORR) have been extensively studied but are still inconclusive, partly due to the lack of an experimental method that can detect the active sites. It is proposed in this report that the active sites on nitrogen-doped graphene can be determined via the examination of its chemical composition change

Single

A crucial component in the design of the single-atomic-site (SAS) catalysts for electrochemical applications is the specific surface area and porous structure. Here, we synthesize a type of Co catalyst with single-atomic Co sites embedded in hierarchically ordered porous N -doped carbon showing superior bifunctional activity for oxygen reduction reaction and hydrogen evolution reactions

Observation of active sites for oxygen reduction reaction

Active sites and the catalytic mechanism of nitrogen-doped graphene in an oxygen reduction reaction (ORR) have been extensively studied but are still inconclusive, partly due to the lack of an experimental method that can detect the active sites. It is proposed in

Identification of Active Sites of Pure and Nitrogen

Identification of Active Sites of Pure and Nitrogen-Doped Carbon Materials for Oxygen Reduction Reaction Using Constant-Potential Calculations Zhiyao Duan and Graeme Henkelman* Cite This: J. Phys. Chem. C 2020, 124, 12016−12023 Read Online ACCESS Metrics More Article Recommendations *

Nitrogen release and pore formation through KOH

The simultaneous use of KOH and nitrogen to manufacture carbon materials provides these materials with properties that the presence of only one of these additives would not give them, such as high porosity and reactivity. However, it is difficult to obtain nitrogen-doped carbon materials with both high porosity and high nitrogen content, as the KOH significantly reduces the nitrogen content

Stabilizing Active Edge Sites in Semicrystalline

Stabilizing Active Edge Sites in Semicrystalline Molybdenum Sulfide by Anchorage on Nitrogen-Doped Carbon Nanotubes for Hydrogen Evolution Reaction Ekspong, Joakim Ume University, Faculty of Science and Technology, Department of Physics.

Structure Engineering in Biomass

Biomass-derived carbon materials (B-d-CMs) are considered as a group of very promising electrode materials for electrochemical energy storage (EES) by virtue of their naturally diverse and intricate microarchitectures, extensive and low-cost source, environmental friendliness, and feasibility to be produced in a large scale. However, the practical application of raw B-d-CMs in EES is limited

ELECTROCHEMISTRY Active sites of nitrogen

ELECTROCHEMISTRY Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts Donghui Guo,1 Riku Shibuya,2 Chisato Akiba, 2Shunsuke Saji, Takahiro Kondo, 1* Junji Nakamura * Nitrogen (N)–doped carbon

Nitrogen

Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present

Identification of active sites for acidic oxygen reduction

much superior to the pyridinic nitrogen sites in nitrogen-doped highly oriented pyrolytic graphite. the dopant or defect types and their homogeneity in carbon materials, it is still a controversial issue to identify the active sites of carbon-based metal-free

Insights into oxygen reduction reaction (ORR) and oxygen

Nitrogen-doped carbon nanostructures (CNx) are promising cathode materials as catalysts for the oxygen reduction reaction (ORR) in polymer electrolyte membrane (PEM) fuel cells. Incorporation of chlorine into CN x catalysts using a facile methodology can lead to a significant improvement in the ORR activity in acidic media, as confirmed by electrochemical half-cell measurements.

Nitrogen release and pore formation through KOH

The simultaneous use of KOH and nitrogen to manufacture carbon materials provides these materials with properties that the presence of only one of these additives would not give them, such as high porosity and reactivity. However, it is difficult to obtain nitrogen-doped carbon materials with both high porosity and high nitrogen content, as the KOH significantly reduces the nitrogen content

Design and Synthesis of Nitrogen

Design and Synthesis of Nitrogen-Doped Porous Carbon Materials for CO 2 Capture and Investigation of CO 2 Sorption Kinetics Investigators Jennifer Wilcox, Assistant Professor, Energy Resources Engineering; T. Daniel P. Stack, Associate Professor, Chemistry

A nitrogen

A three-dimensional nitrogen-doped carbon framework (NCF) has been synthesized by annealing a zeolitic imidazolate framework (ZIF-67), followed by removing the residual metal ions. The NCF shows a polyhedral outline with strong interconnected hollow nanospheres as its subunits. It is highly porous, with a large surface area of 623 m2 g−1, and a high nitrogen content of 12.3 wt%. When applied

Nitrogen

Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present

Electrochemical and Computational Study of Oxygen

The recently developed transition metal/nitrogen doped carbon-based materials (TM-N-C) exhibited catalytic activity close to that of platinum, but there are still many questions under debate. In this thesis, electrochemical and computational methods were employed

Identification of Active Sites of Pure and Nitrogen

Nitrogen-doped carbon materials are promising metal-free catalysts for the electrochemical oxygen reduction reaction (ORR). A better theoretical understanding on the nature of the active site(s) would help further optimization of their ORR activity. Although quantum mechanical calculations have been widely employed to elucidate the active sites over various catalysts, these calculations are

Identifying Active Sites of Nitrogen‐Doped Carbon

Nitrogen‐doped carbon materials are proposed as promising electrocatalysts for the carbon dioxide reduction reaction (CRR), which is essential for renewable energy conversion and environmental remediation. Unfortunately, the unclear cognition on the CRR active

Transition Metal and Nitrogen Co‐Doped Carbon‐based

Transition Metal and Nitrogen Co‐Doped Carbon‐based Electrocatalysts for the Oxygen Reduction Reaction: From Active Site Insights to the Rational Design of Precursors and Structures Dan Wang MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001 P. R. China

Nitrogen release and pore formation through KOH

The simultaneous use of KOH and nitrogen to manufacture carbon materials provides these materials with properties that the presence of only one of these additives would not give them, such as high porosity and reactivity. However, it is difficult to obtain nitrogen-doped carbon materials with both high porosity and high nitrogen content, as the KOH significantly reduces the nitrogen content

Direct Characterization of Atomically Dispersed Catalysts:

2020/11/13Metal, nitrogen-doped carbon materials have attracted interest as heterogenous catalysts that contain MNx active sites that are analogous to molecular catalysts. Of particular interest is Ni, N-doped carbon, a catalyst that is active for the electrochemical reduction of CO2 to CO. Critical to the

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