Insights into the reversible oxygen reduction reaction in a series of phosphonium-based ionic liquids

2014 ◽  
Vol 16 (45) ◽  
pp. 25062-25070 ◽  
Author(s):  
Cristina Pozo-Gonzalo ◽  
Patrick C. Howlett ◽  
Jennifer L. Hodgson ◽  
Louis A. Madsen ◽  
Douglas R. MacFarlane ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Quantum Chemistry ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Superoxide Anion ◽  
Reduction Reaction ◽  
Computational Quantum Chemistry ◽  
The Stability ◽  
Computational Quantum

Extensive evidence for the stability of the superoxide anion in phosphonium-based ILs is demonstrated by computational quantum chemistry and NMR.

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.

scholarly journals Effect of Pyrolysis Conditions on the Performance of Co–Doped MOF–Derived Carbon Catalysts for Oxygen Reduction Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1163
Author(s):  
Ning Cui ◽  
Kexiao Bi ◽  
Wei Sun ◽  
Qianqian Wu ◽  
Yinan Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Heating Rate ◽  
Reduction Reaction ◽  
Half Wave ◽  
Step Heating ◽  
The Stability ◽  
Carbon Catalysts ◽  
Co Doped

MOF–derived porous carbon is a type of promising catalyst to replace expensive Pt–based catalysts for oxygen reduction reaction (ORR). The catalytic activity for ORR depends closely on pyrolysis conditions. In this work, a Co–doped ZIF–8 material was chosen as a research object. The effect of pyrolysis conditions (temperature, heating rate, two–step heating) on the ORR performance of ZIF–derived carbon catalysts was systematically studied. The Co–ZIF–8 catalyst carbonized at 900 °C exhibits better ORR catalytic activity than that carbonized at 800 °C and 1000 °C. Moreover, a low heating rate can enhance catalytic activity. Two–step pyrolysis is proven to be an effective way to improve the performance of catalysts. Reducing the heating rate in the low–temperature stage is more beneficial to the ORR performance, compared to the heating rate in the high–temperature stage. The results show that the Co–ZIF–8 catalyst exhibits the best performance when the precursor was heated to 350 °C at 2 °C/min, and then heated to 900 °C at 5 °C/min. The optimum Co–ZIF–8 catalyst shows a half–wave potential of 0.82 V and a current density of 5.2 mA·cm−2 in 0.1 M KOH solution. It also exhibits high content of defects and good graphitization. TEM mapping shows that Co and N atoms are highly dispersed in the polyhedral carbon skeleton. However, two–step pyrolysis has no significant effect on the stability of the catalyst.

scholarly journals Sequential Capacitive Deposition of Ionic Liquids for Conformal Thin Film Coatings on Oxygen Reduction Reaction Electrocatalysts

ACS Catalysis ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 9311-9316 ◽  
Author(s):  
Yawei Li ◽  
James Hart ◽  
Lauren Profitt ◽  
Saad Intikhab ◽  
Swarnendu Chatterjee ◽  
...  
Keyword(s):  
Thin Film ◽  
Ionic Liquids ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Film Coatings ◽  
Thin Film Coatings

Oxygenophilic ionic liquids promote the oxygen reduction reaction in Pt-free carbon electrocatalysts

2017 ◽  
Vol 4 (5) ◽  
pp. 895-899 ◽  
Author(s):  
Mo Qiao ◽  
Cheng Tang ◽  
Liviu Cristian Tanase ◽  
Cristian Mihail Teodorescu ◽  
Chengmeng Chen ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Fuel Cells ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Polymer Electrolyte ◽  
Surface Properties ◽  
Polymer Electrolyte Membrane ◽  
Reduction Reaction ◽  
Alkaline Fuel Cells ◽  
Electrolyte Membrane

We propose a novel idea to improve the surface properties of carbon-based Pt-free electrocatalysts in Polymer Electrolyte Membrane Fuel Cells (PEMFCs) and Alkaline Fuel Cells (AFCs).

Time Evolution of the Stability and Oxygen Reduction Reaction Activity of PtCu/C Nanoparticles

ChemCatChem ◽  
2013 ◽  
Vol 5 (9) ◽  
pp. 2627-2635 ◽  
Author(s):  
Chinnaya Jeyabharathi ◽  
Nejc Hodnik ◽  
Claudio Baldizzone ◽  
Josef C. Meier ◽  
Marc Heggen ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Time Evolution ◽  
Reduction Reaction ◽  
Oxygen Reduction Reaction Activity ◽  
The Stability
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