Large-Scale Production of Edge-Selectively Functionalized Graphene Nanoplatelets via Ball Milling and Their Use as Metal-Free Electrocatalysts for Oxygen Reduction Reaction

2012 ◽  
Vol 135 (4) ◽  
pp. 1386-1393 ◽  
Author(s):  
In-Yup Jeon ◽  
Hyun-Jung Choi ◽  
Sun-Min Jung ◽  
Jeong-Min Seo ◽  
Min-Jung Kim ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Ball Milling ◽  
Large Scale ◽  
Reduction Reaction ◽  
Graphene Nanoplatelets ◽  
Scale Production ◽  
Functionalized Graphene ◽  
Metal Free ◽  
Large Scale Production

scholarly journals 3D interconnected nitrogen-self-doped carbon aerogels as efficient oxygen reduction electrocatalysts derived from biomass gelatin

RSC Advances ◽  
2019 ◽  
Vol 9 (69) ◽  
pp. 40301-40308 ◽  
Author(s):  
Haoqi Yang ◽  
Shuqing Kou ◽  
Zhiyuan Li ◽  
Zhiyong Chang ◽  
Mi Wang ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Large Scale ◽  
Reduction Reaction ◽  
Carbon Aerogels ◽  
Manufacturing Cost ◽  
Scale Production ◽  
Environmental Friendliness ◽  
Metal Free ◽  
Large Scale Production

Development of efficient metal-free electrocatalysts derived from biomass with high activity towards oxygen reduction reaction (ORR) has gained significance attention due to their low manufacturing cost, environmental friendliness and easy large-scale production.

scholarly journals Electrocatalysis for Oxygen Reduction Reaction on EDTAFeNa and Melamine co-Derived Self-Supported Fe-N-C Materials

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 623
Author(s):  
Mengfan Shen ◽  
Ziwei Meng ◽  
Tong Xue ◽  
Hongfang Shen ◽  
Xiang-Hui Yan
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Large Scale ◽  
Acid Leaching ◽  
Reduction Reaction ◽  
Scale Production ◽  
Final Annealing ◽  
High Performing ◽  
Half Wave ◽  
Mesoscopic Structure

To explore high-performing alternatives to platinum-based catalysts is highly desirable for lowering costs and thus promoting fuel cell commercialization. Herein, self-supported Fe-N-C materials were prepared by the pyrolysis of dual precursors including EDTA ferric sodium (EDTAFeNa) and melamine (MA), followed by acid-leaching and final annealing. Towards an oxygen reduction reaction (ORR) in 0.1 M KOH, the as-prepared MA/EDTAFeNa-HT2 delivered onset (Eonset) and half-wave (E1/2) potentials of 0.97 and 0.84 V vs. RHE, respectively, identical with that of a state-of-the-art Pt/C catalyst, accompanied with predominantly a four-electron pathway. The introduction of MA and extension of acid-leaching promoted a positive shift of 50 mV for E1/2 relative to that of only the EDTAFeNa-derived counterpart. It was revealed that the enhancement of ORR activity is attributed to a decrease in magnetic Fe species and increase in pyridinic/quanternary nitrogen content whilst nearly excluding effects of the graphitization degree, variety of crystalline iron species, and mesoscopic structure. The usage of dual precursors exhibited great potential for the large-scale production of inexpensive and efficient Fe-N-C materials.

scholarly journals Electrochemically derived functionalized graphene for bulk production of hydrogen peroxide

2020 ◽  
Vol 11 ◽  
pp. 432-442 ◽  
Author(s):  
Munaiah Yeddala ◽  
Pallavi Thakur ◽  
Anugraha A ◽  
Tharangattu N Narayanan
Keyword(s):  
Large Scale ◽  
Reduction Reaction ◽  
Single Step ◽  
Scale Production ◽  
Functionalized Graphene ◽  
Large Scale Production ◽  
Production Of Hydrogen ◽  
Electron Reduction ◽  
Bulk Production ◽  
Carbon Based

On-site peroxide generation via electrochemical reduction is gaining tremendous attention due to its importance in many fields, including water treatment technologies. Oxidized graphitic carbon-based materials have been recently proposed as an alternative to metal-based catalysts in the electrochemical oxygen reduction reaction (ORR), and in this work we unravel the role of C=O groups in graphene towards sustainable peroxide formation. We demonstrate a versatile single-step electrochemical exfoliation of graphite to graphene with a controllable degree of oxygen functionalities and thickness, leading to the formation of large quantities of functionalized graphene with tunable rate parameters, such as the rate constant and exchange current density. Higher oxygen-containing exfoliated graphene is known to undergo a two-electron reduction path in ORR having an efficiency of about 80 ± 2% even at high overpotential. Bulk production of H2O2 via electrolysis was also demonstrated at low potential (0.358 mV vs RHE), yielding ≈34 mg/L peroxide with highly functionalized (≈23 atom %) graphene and ≈16 g/L with low functionalized (≈13 atom %) graphene, which is on par with the peroxide production using state-of-the-art precious-metal-based catalysts. Hence this method opens a new scheme for the single-step large-scale production of functionalized carbon-based catalysts (yield ≈45% by weight) that have varying functionalities and can deliver peroxide via the electrochemical ORR process.

Edge-iodine/sulfonic acid-functionalized graphene nanoplatelets as efficient electrocatalysts for oxygen reduction reaction

2014 ◽  
Vol 2 (23) ◽  
pp. 8690-8695 ◽  
Author(s):  
Jong Yeol Baek ◽  
In-Yup Jeon ◽  
Jong-Beom Baek
Keyword(s):  
Oxygen Reduction Reaction ◽  
Ball Milling ◽  
Electrocatalytic Activity ◽  
Sulfonic Acid ◽  
Sulfur Trioxide ◽  
Reduction Reaction ◽  
Graphene Nanoplatelets ◽  
Functionalized Graphene ◽  
Cycle Stability ◽  
Polar Solvents

Edge-iodine/sulfonic acid-functionalized graphene nanoplatelets (ISGnPs) were prepared by two-step sequential ball-milling of graphite in the presence of iodine and sulfur trioxide. The resultant ISGnPs are highly dispersible in various polar solvents and the ORR performance of ISGnPs in an alkaline medium is superior to commercial Pt/C in terms of electrocatalytic activity and cycle stability.

Sign in / Sign up

Export Citation Format

Share Document