Dual-modulation of electronic structure and active sites of PtCu nanodendrites by surface nitridation to achieve efficient methanol electrooxidation and oxygen reduction reaction

2020 ◽  
Vol 56 (52) ◽  
pp. 7136-7139
Author(s):  
TianShan Song ◽  
Hui Xue ◽  
NianKun Guo ◽  
Jing Sun ◽  
Ling Qin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acidic Medium ◽  
Active Sites ◽  
Reduction Reaction ◽  
Methanol Electrooxidation ◽  
Surface Modifier ◽  
Electrocatalytic Performance

A facile method to prepare PtCu nanodendrites rich in multiple active sites was reported using pyridine as a surface modifier. They exhibit outstanding electrocatalytic performance towards ORR and MOR in acidic medium.

Nitrogen and sulphur co-doped crumbled graphene for the oxygen reduction reaction with improved activity and stability in acidic medium

2016 ◽  
Vol 4 (16) ◽  
pp. 6014-6020 ◽  
Author(s):  
Siddheshwar N. Bhange ◽  
Sreekuttan M. Unni ◽  
Sreekumar Kurungot
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acidic Medium ◽  
Active Sites ◽  
Reduction Reaction ◽  
Acidic Conditions ◽  
Co Doped

A crumbled graphene structure with heteroatom doped active sites derived through the pyrolysis of polyethylenedioxythiophene served as an efficient platinum-free electrocatalyst for oxygen reduction under acidic conditions.

scholarly journals Degradation and regeneration of Fe-Nx active sites for oxygen reduction reaction: the role of surface oxidation, Fe demetallation and local carbon microporosity

2021 ◽  
Author(s):  
Dongsheng Xia ◽  
Chenchen Yu ◽  
Yinghao Zhao ◽  
Yinping Wei ◽  
Haiyan Wu ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Sites ◽  
Proton Exchange Membrane ◽  
Degradation Mechanism ◽  
Surface Oxidation ◽  
Reduction Reaction ◽  
Proton Exchange ◽  
Exchange Membrane

The severe degradation of Fe-N-C electrocatalysts during long-term oxygen reduction reaction (ORR) has become a major obstacle for application in proton-exchange membrane fuel cells. Understanding the degradation mechanism and regeneration...

scholarly journals Superior FexN electrocatalyst derived from 1,1′-diacetylferrocene for oxygen reduction reaction in alkaline and acidic media

2020 ◽  
Vol 9 (1) ◽  
pp. 843-852
Author(s):  
Hunan Jiang ◽  
Jinyang Li ◽  
Mengni Liang ◽  
Hanpeng Deng ◽  
Zuowan Zhou
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Current Density ◽  
Active Sites ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Acidic Media ◽  
Onset Potential ◽  
Acidic And Alkaline Media ◽  
The Stability

AbstractAlthough Fe–N/C catalysts have received increasing attention in recent years for oxygen reduction reaction (ORR), it is still challenging to precisely control the active sites during the preparation. Herein, we report FexN@RGO catalysts with the size of 2–6 nm derived from the pyrolysis of graphene oxide and 1,1′-diacetylferrocene as C and Fe precursors under the NH3/Ar atmosphere as N source. The 1,1′-diacetylferrocene transforms to Fe3O4 at 600°C and transforms to Fe3N and Fe2N at 700°C and 800°C, respectively. The as-prepared FexN@RGO catalysts exhibited superior electrocatalytic activities in acidic and alkaline media compared with the commercial 10% Pt/C, in terms of electrochemical surface area, onset potential, half-wave potential, number of electrons transferred, kinetic current density, and exchange current density. In addition, the stability of FGN-8 also outperformed commercial 10% Pt/C after 10000 cycles, which demonstrates the as-prepared FexN@RGO as durable and active ORR catalysts in acidic media.

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