2D nanoplate assembled nitrogen doped hollow carbon sphere decorated with Fe3O4 as an efficient electrocatalyst for oxygen reduction reaction and Zn-air batteries

Nano Research ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2774-2780 ◽  
Author(s):  
Yanqiang Li ◽  
Huiyong Huang ◽  
Siru Chen ◽  
Xin Yu ◽  
Chao Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Carbon Sphere ◽  
Nitrogen Doped ◽  
Hollow Carbon Sphere ◽  
Hollow Carbon

Iron–nitrogen co-doped hollow carbon sphere with mesoporous structure for enhanced oxygen reduction reaction

RSC Advances ◽  
2015 ◽  
Vol 5 (125) ◽  
pp. 103302-103307 ◽  
Author(s):  
Qingwen Gao ◽  
Qingxue Lai ◽  
Yanyu Liang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Mesoporous Structure ◽  
Reduction Reaction ◽  
High Oxygen ◽  
Carbon Sphere ◽  
Hollow Carbon Sphere ◽  
Reduction Activity ◽  
Hollow Carbon ◽  
Co Doped

An iron–nitrogen co-doped hollow carbon sphere (FeN-HCS) with a mesoporous structure was prepared and exhibited extremely high oxygen reduction activity.

Coupled cobalt oxide/hollow carbon sphere as an efficient electrocatalyst for the oxygen reduction reaction

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34159-34164 ◽  
Author(s):  
Zongkun Chen ◽  
Dandan He ◽  
Xiujuan Xu ◽  
Zhenzhen Liu ◽  
Minghua Huang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Cobalt Oxide ◽  
Reduction Reaction ◽  
Carbon Sphere ◽  
One Pot ◽  
Efficient Catalyst ◽  
Hollow Carbon Sphere ◽  
Hollow Carbon

Nanosized Co3O4 and the hollow carbon sphere has been deliberately coupled to be as an non-precious efficient catalyst for oxygen reduction reaction by a facile one-pot method.

scholarly journals Synthesis of amorphous and graphitized porous nitrogen-doped carbon spheres as oxygen reduction reaction catalysts

2020 ◽  
Vol 11 ◽  
pp. 1-15 ◽  
Author(s):  
Maximilian Wassner ◽  
Markus Eckardt ◽  
Andreas Reyer ◽  
Thomas Diemant ◽  
Michael S Elsaesser ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Nitrogen Content ◽  
Oxygen Reduction ◽  
Nitrogen Doping ◽  
Reduction Reaction ◽  
Model Systems ◽  
Carbon Sphere ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
N Doping

Amorphous and graphitized nitrogen-doped (N-doped) carbon spheres are investigated as structurally well-defined model systems to gain a deeper understanding of the relationship between synthesis, structure, and their activity in the oxygen reduction reaction (ORR). N-doped carbon spheres were synthesized by hydrothermal treatment of a glucose solution yielding carbon spheres with sizes of 330 ± 50 nm, followed by nitrogen doping via heat treatment in ammonia atmosphere. The influence of a) varying the nitrogen doping temperature (550–1000 °C) and b) of a catalytic graphitization prior to nitrogen doping on the carbon sphere morphology, structure, elemental composition, N bonding configuration as well as porosity is investigated in detail. For the N-doped carbon spheres, the maximum nitrogen content was found at a doping temperature of 700 °C, with a decrease of the N content for higher temperatures. The overall nitrogen content of the graphitized N-doped carbon spheres is lower than that of the amorphous carbon spheres, however, also the microporosity decreases strongly with graphitization. Comparison with the electrocatalytic behavior in the ORR shows that in addition to the N-doping, the microporosity of the materials is critical for an efficient ORR.

scholarly journals Fe atoms anchored on defective nitrogen doped hollow carbon spheres as efficient electrocatalysts for oxygen reduction reaction

Nano Research ◽  
2020 ◽  
Author(s):  
Panpan Su ◽  
Wenjuan Huang ◽  
Jiangwei Zhang ◽  
Utsab Guharoy ◽  
Qinggang Du ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Density Functional ◽  
Reduction Reaction ◽  
Carbon Spheres ◽  
Coordination Structure ◽  
Nitrogen Doped ◽  
Orr Activity ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

AbstractDefective electrocatalysts, especially for intrinsic defective carbon, have aroused a wide concern owing to high spin and charge densities. However, the designated nitrogen species favorable for creating defects by the removal of nitrogen, and the influence of defects for the coordination structure of active site and oxygen reduction reaction (ORR) activity have not been elucidated. Herein, we designed and synthesized a pair of electrocatalysts, denoted as Fe-N/C and Fe-ND/C for coordination sites of atomic iron-nitrogen and iron-nitrogen/defect configuration embedded in hollow carbon spheres, respectively, through direct pyrolysis of their corresponding hollow carbon spheres adsorbed with Fe(acac)3. The nitrogen defects were fabricated via the evaporation of pyrrolic-N on nitrogen doped hollow carbon spheres. Results of comparative experiments between Fe-N/C and Fe-ND/C reveal that Fe-ND/C shows superior ORR activity with an onset potential of 30 mV higher than that of Fe-N/C. Fe-ND sites are more favorable for the enhancement of ORR activity. Density functional theory (DFT) calculation demonstrates that Fe-ND/C with proposed coordination structure of FeN4−x (0<x<4) anchored by OH as axial ligand during ORR, weakens the strong binding of OH* intermediate and promotes the desorption of OH* as rate-determining step for ORR in alkaline electrolyte. Thus, Fe-ND/C electrocatalysts present much better ORR activity compared with that of Fe-N/C with proposed coordination structure of FeN4.

Nitrogen-doped hollow carbon polyhedron derived from salt-encapsulated ZIF-8 for efficient oxygen reduction reaction

Carbon ◽  
2021 ◽  
Vol 171 ◽  
pp. 320-328
Author(s):  
Jin Yan ◽  
Xiangjun Zheng ◽  
Chaohui Wei ◽  
Zhihui Sun ◽  
Kai Zeng ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Nitrogen Doped ◽  
Hollow Carbon

scholarly journals Efficient oxygen reduction reaction by a highly porous, nitrogen-doped carbon sphere electrocatalyst through space confinement effect in nanopores

2021 ◽  
Author(s):  
Zheyang Mo ◽  
Weiyi Yang ◽  
Shuang Gao ◽  
Jian Ku Shang ◽  
Yajun Ding ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Reduction Reaction ◽  
Confinement Effect ◽  
Carbon Sphere ◽  
Nitrogen Doped ◽  
Electron Reduction ◽  
Nitrogen Doped Carbon ◽  
Highly Porous

AbstractA highly porous nitrogen-doped carbon sphere (NPC) electrocatalyst was prepared through the carbonization of biomass carbon spheres mixed with urea and zinc chloride in N2 atmosphere. The sample carbonized at 1000 °C demonstrates a superior oxygen reduction reaction (ORR) performance over the Pt/C electrocatalyst, while its contents of pyridinic nitrogen and graphitic nitrogen are the lowest among samples synthesized at the same or lower carbonization temperatures. This unusual result is explained by a space confinement effect from the microporous and mesoporous structures in the microflakes, which induces the further reduction of peroxide ions or other oxygen species produced in the first step reduction to water to have the preferred overall four electron reduction ORR process. This work demonstrates that in addition to the amount or species of its active sites, the space confinement can be a new approach to enhance the ORR performance of precious-metal-free, nitrogen-doped carbon electrocatalysts.

Sign in / Sign up

Export Citation Format

Share Document