γ-Fe2O3 clusters embedded in 1D porous N-doped carbon matrix as pH-universal electrocatalyst for enhanced oxygen reduction reaction

2021 ◽  
Vol 415 ◽  
pp. 129033
Author(s):  
Zhihui Yao ◽  
Yuting Li ◽  
Daisong Chen ◽  
Yiwen Zhang ◽  
Xinghong Bao ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Carbon Matrix ◽  
Reduction Reaction

Subnanometer iron clusters confined in a porous carbon matrix for highly efficient zinc–air batteries

2020 ◽  
Vol 5 (2) ◽  
pp. 359-365 ◽  
Author(s):  
Xin Wu ◽  
Juncai Dong ◽  
Mei Qiu ◽  
Yang Li ◽  
Yongfan Zhang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Three Dimensional ◽  
Carbon Matrix ◽  
Reduction Reaction ◽  
Iron Clusters ◽  
Highly Efficient ◽  
Zinc Air Batteries

We describe a facile synthetic protocol to realize the decoration of Fe coordinates at the subnanometer scale into a three-dimensional porous carbon matrix, which great promotes the oxygen reduction reaction compared with isolated Fe atoms.

Ultrafine Mo2C Nanoparticles Embedded in MOF Derived N and P co-doped Carbon Matrix for Efficient Electrocatalytic Oxygen Reduction Reaction in Zinc-Air Batteries

Nanoscale ◽  
2022 ◽  
Author(s):  
Lin Ye ◽  
Yiran Ying ◽  
Dengrong Sun ◽  
Jinli Qiao ◽  
Haitao Huang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Carbon Matrix ◽  
Reduction Reaction ◽  
Electrocatalytic Oxygen Reduction ◽  
Energy Conversion And Storage ◽  
Storage Technologies ◽  
And Storage ◽  
Co Doped ◽  
Zinc Air Batteries

Exploring high-activity electrocatalysts for oxygen reduction reaction (ORR) is of great significance for a variety of renewable energy conversion and storage technologies. Here, ultrafine Mo2C nanoparticles assembled in N and...

Phase Control of Ultrafine FeSe Nanocrystals in N-doped Carbon Matrix for Highly Efficient and Stable Oxygen Reduction Reaction

2021 ◽  
Author(s):  
Yangfei Cao ◽  
Senchuan Huang ◽  
Zhangquan Peng ◽  
Fen Yao ◽  
Xiaohui Li ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Energy Efficient ◽  
Carbon Matrix ◽  
Cost Effective ◽  
Phase Control ◽  
Reduction Reaction ◽  
Metal Chalcogenides ◽  
Transition Metal Chalcogenides ◽  
Stable Oxygen

Transition metal chalcogenides have been known as cost-effective and energy-efficient electrocatalysts for oxygen reduction reaction (ORR). Crystal phase control is vital for tailoring their ORR performances. Herein, hexagonal (h-FeSe) and...

scholarly journals A Facile Method for the Generation of Fe3C Nanoparticle and Fe-Nx Active Site in Carbon Matrix to Achieve Good Oxygen Reduction Reaction Electrochemical Performances

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4779
Author(s):  
Yuzhe Wu ◽  
Yuntong Li ◽  
Conghui Yuan ◽  
Lizong Dai
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Site ◽  
High Performance ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Carbon Matrix ◽  
Reduction Reaction ◽  
Electrochemical Performances ◽  
Active Electrode

Introduction of both nitrogen and transition metal elements into the carbon materials has demonstrated to be a promising strategy to construct highly active electrode materials for energy shortage. In this work, through the coordination reaction between Fe3+ and 1,3,5–tris(4–aminophenyl)benzene, metallosupramolecular polymer precursors are designed for the preparation of carbon flakes co-doped with both Fe and N elements. The as-prepared carbon flakes display wrinkled edges and comprise Fe3C nanoparticle and active site of Fe–Nx. These carbon materials exhibit excellent electrocatalytic performance. Towards oxygen reduction reaction (ORR), the optimized sample has Eonset and Ehalf-wave of 0.93 V and 0.83 V in alkaline system, respectively, which are very close to that of Pt/C. This approach may offer a new way to high performance and low-cost electrochemical catalysts.

Identify the impact of the covalent-bonded carbon matrix to FeN4 sites for acidic oxygen reduction

2021 ◽  
Author(s):  
Xueli Li ◽  
Zhonghua Xiang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Density Functional ◽  
Carbon Matrix ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Synthetic Methods ◽  
Oxygen Intermediates ◽  
Orr Activity ◽  
The Impact

Abstract Atomically dispersed Fe and N co-doped carbon (Fe–N–C) catalysts exhibited superior acid oxygen reduction reaction (ORR) activities and recently been considered as the most promising alternatives to the benchmark Pt-based catalysts for proton exchange membrane fuel cells. The atomic configuration between Fe, N and C is one of the key factors to affect ORR activity. However, the traditional synthetic methods that rely on pyrolysis of the mixtures of Fe, N and C precursors often result in the plurality of local environment for the FeNx site. Unveiling the effect of covalent-bonded carbon matrix to FeNx sites towards ORR activity is important but still a great challenge due to inevitable connection of diverse N as well as random defects during the pyrolysis process. Here, we report a proof-of-concept study on the evaluation of covalent-bonded carbon environment connected to FeN4 sites on their catalytic activity via pyrolysis-free approach. Basing on the closed π conjugated phthalocyanine-based intrinsic covalent organic polymers (COPs) with well-designed structures, we directly synthesized a series of atomically dispersed Fe-N-C catalysts with various pure carbon environment without any N doping directly connected to the same FeN4 sites. Experiments coupled with density functional theory demonstrate that the catalytic activities appear a volcano plot with the increase of degree of delocalized π electrons from the carbon matrix. The delocalized π electrons changed anti-bonding d-state energy level of the single FeN4 moieties, hence tailored the adsorption between active centers and oxygen intermediates and altered the rate-determining step of oxygen reduction reaction.

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