Theoretical and experimental studies of highly active graphene nanosheets to determine catalytic nitrogen sites responsible for the oxygen reduction reaction in alkaline media

2016 ◽  
Vol 4 (3) ◽  
pp. 976-990 ◽  
Author(s):  
J. Vazquez-Arenas ◽  
A. Galano ◽  
D. U. Lee ◽  
D. Higgins ◽  
A. Guevara-García ◽  
...  
Keyword(s):  
Heating Temperature ◽  
Rapid Heating ◽  
Graphene Nanosheets ◽  
Experimental Studies ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Step Method ◽  
Highly Active ◽  
Temperature Ramps ◽  
One Step

Graphene nanosheets with heterogeneously doped nitrogen atoms are synthesized using a facile one-step method based on extremely rapid heating (temperature ramps ≥ 150 °C s−1).

Highly active bimetallic CuFe–N–C electrocatalysts for oxygen reduction reaction in alkaline media

2019 ◽  
Vol 71 ◽  
pp. 234-241 ◽  
Author(s):  
Yun Sik Kang ◽  
Yoonhye Heo ◽  
Jae Young Jung ◽  
Yeonsun Sohn ◽  
Soo-Hyoung Lee ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Highly Active

scholarly journals Improving the Activity of Fe/C/N ORR Electrocatalyst Using Double Ammonia Promoted CO2 Laser Pyrolysis

2020 ◽  
Vol 6 (4) ◽  
pp. 63
Author(s):  
Henri Perez ◽  
Mathieu Frégnaux ◽  
Emeline Charon ◽  
Arnaud Etcheberry ◽  
Olivier Sublemontier
Keyword(s):  
Co2 Laser ◽  
Large Scale ◽  
Laser Energy ◽  
Reduction Reaction ◽  
Laser Pyrolysis ◽  
Highly Active ◽  
One Step ◽  
Orr Activity ◽  
Set Up ◽  
The One

Recently, we reported the use of CO2 laser pyrolysis for the synthesis of promising Fe/C/N electrocatalysts for Oxygen Reduction Reaction (ORR) in fuel cells. The set-up used single laser pyrolysis of an aerosolized solution of iron acetylacetonate in toluene with ammonia, both as laser energy transfer agent and nitrogen source. In the present paper, we investigate the effect of a second ammonia promoted CO2 laser pyrolysis on the feature and ORR activity of Fe/C/N electrocatalysts. Indeed, compared to single pyrolysis, the second ammonia promoted CO2 laser pyrolysis could be an interesting way to synthesize in one-step performing ORR electrocatalysts on a large scale. For this comparison, a two-stage reactor was built, allowing both single ammonia-induced CO2 laser pyrolysis as reported previously or double ammonia-induced CO2 laser pyrolysis. In the latter configuration, the catalyst nanopowder flow is formed at the first stage of the reactor, then mixed with a second ammonia flow and allowed to cross a second CO2 laser beam, thus undergoing a second ammonia-induced CO2 laser pyrolysis before being collected on filters. It is found that the second ammonia-induced CO2 laser pyrolysis significantly improves the ORR performances of the materials prepared by single CO2 laser pyrolysis. The effect is demonstrated for three different catalysts for which the onset potentials for the ORR from single-stage to double-stage configuration increase from 625 mV to 845 mV, 790 mV to 860 mV, and 800 mV to 885 mV, respectively. The selectivity of the ORR was determined at 600 mV/SHE and lie between 3.41 and 3.72. These promising performances suggesting potentialities for the one-step formation of highly active Fe/C/N ORR electrocatalysts are discussed, based on results of surface analysis by XPS, specific surface area measurements, and Raman spectroscopy.

One step synthesis of carbon-supported Ag/MnyOx composites for oxygen reduction reaction in alkaline media

2011 ◽  
Vol 104 (3-4) ◽  
pp. 337-345 ◽  
Author(s):  
Qiwen Tang ◽  
Luhua Jiang ◽  
Jing Qi ◽  
Qian Jiang ◽  
Suli Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
One Step

One-step synthesis of trimetallic Pt–Pd–Ru nanodendrites as highly active electrocatalysts

RSC Advances ◽  
2015 ◽  
Vol 5 (39) ◽  
pp. 31147-31152 ◽  
Author(s):  
Kamel Eid ◽  
Victor Malgras ◽  
Pei He ◽  
Kunmiao Wang ◽  
Ali Aldalbahi ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Methanol Oxidation ◽  
Oxidation Reaction ◽  
Reduction Reaction ◽  
Methanol Oxidation Reaction ◽  
Highly Active ◽  
One Step

Trimetallic Pt–Pd–Ru nanodendrites synthesized by a one-step route are highly active electrocatalysts for methanol oxidation reaction and oxygen reduction reaction.

One-step fabrication of bimetallic PtNi mesoporous nanospheres as an efficient catalyst for the oxygen reduction reaction

Nanoscale ◽  
2018 ◽  
Vol 10 (34) ◽  
pp. 16087-16093 ◽  
Author(s):  
Hongjing Wang ◽  
Hongjie Yu ◽  
Shuli Yin ◽  
Yinghao Li ◽  
Hairong Xue ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Active Catalyst ◽  
Reduction Reaction ◽  
Step Method ◽  
Efficient Catalyst ◽  
One Step

PtNi mesoporous nanospheres are fabricated by a one-step method in aqueous solution and used as an active catalyst for the oxygen reduction reaction.

One-step preparation of N-doped graphitic layer-encased cobalt/iron carbide nanoparticles derived from cross-linked polyphthalocyanines as highly active electrocatalysts towards the oxygen reduction reaction

2017 ◽  
Vol 7 (7) ◽  
pp. 1529-1536 ◽  
Author(s):  
Zhengping Zhang ◽  
Shaoxuan Yang ◽  
Meiling Dou ◽  
Jing Ji ◽  
Feng Wang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Iron Carbide ◽  
Reduction Reaction ◽  
Graphitic Layer ◽  
Highly Active ◽  
Cobalt Iron ◽  
One Step

The pyrolyzed polyphthalocyanine exhibit much better activity than the pyrolyzed pure phthalocyanine.

scholarly journals Electrochemical Oxygen Reduction Reaction Performance of Water Hyacinth Derived Porous Non-precious Electrocatalyst in Alkaline Media

2020 ◽  
Vol 141 ◽  
pp. 01004
Author(s):  
Kriangsak Ketpang ◽  
Jenkamol Prathum ◽  
Punnarut Juprasat ◽  
Wararak Junla ◽  
Kittisak Wichianwat ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Water Hyacinth ◽  
Low Cost ◽  
Linear Sweep Voltammetry ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
Catalyst Loading ◽  
High Porosity ◽  
Highly Active

This research studied the possibility of converting water hyacinth biomass into the porous non-precious oxygen reduction reaction (ORR) electrocatalyst using a simple, low cost and scalable autogenic pressure method. The electrocatalyst was prepared by thermally annealing water hyacinth root contained ZnCl2 at 700oC under autogenic pressure conditions. The phase of the catalyst was the mixture of carbon and metal oxide. In addition, rough surface morphology and high porosity were clearly observed using scanning electron microscope. The synthesized catalyst was then determined the ORR performance by cyclic voltammetry (CV) and linear sweep voltammetry (LSV) techniques under O2 saturated KOH solution. The ORR performance increased as the catalyst loading was increased and the optimum catalyst loading was found to be 1.5 mg/cm2 which generated the Eonset and E1/2 value of 0.93 V and 0.80 V vs. RHE, respectively. Furthermore, the E1/2 value of the synthesized catalyst was 230 and 130 mV greater than the catalyst synthesized without ZnCl2 and commercial carbon (VXC-72R). ORR durability study suggested that the prepared catalyst was durable to operate ORR for 5000 cycles in alkaline media. These results suggested that the autogenic pressure conditions would be a promising technique to prepare highly active and durable biomass derived ORR electrocatalyst.

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