High-rate oxygen electroreduction over metal-free graphene foams embedding P–N coupled moieties in acidic media

2018 ◽  
Vol 6 (9) ◽  
pp. 4145-4151 ◽  
Author(s):  
Congling Li ◽  
Zhengyan Chen ◽  
Aiguo Kong ◽  
Yangyang Ni ◽  
Fantao Kong ◽  
...  
Keyword(s):  
Carbon Matrix ◽  
Oxygen Electroreduction ◽  
High Rate ◽  
Acidic Media ◽  
Metal Free ◽  
Free Graphene ◽  
Orr Activity ◽  
Carbon Catalysts ◽  
Graphene Foams

Metal-free P,N-doped carbon catalysts with coupled P–N sites in the carbon matrix demonstrated efficient ORR activity in acidic media.

Ultramicropore-influenced mechanism of oxygen electroreduction on metal-free carbon catalysts

2019 ◽  
Vol 7 (47) ◽  
pp. 27110-27123 ◽  
Author(s):  
Deicy Barrera ◽  
Marc Florent ◽  
Margarita Kulko ◽  
Teresa J. Bandosz
Keyword(s):  
Strong Dependence ◽  
Free Carbon ◽  
Oxygen Electroreduction ◽  
Metal Free ◽  
Microporous Carbons ◽  
Carbon Catalysts

Microporous carbons, with nitrogen groups or without, were synthesized and tested as ORR catalysts. A strong dependence of the ORR efficiency on the combined V<0.7nm, ECSA, and the number of dissociating groups (expressed as PIF) was found.

Communication—Synthesis of Self-Doped Metal-Free Electrocatalysts from Waste Leather with High ORR Activity

2015 ◽  
Vol 163 (2) ◽  
pp. H15-H17 ◽  
Author(s):  
D. Lardizabal-Guitierrez ◽  
D. González-Quijano ◽  
P. Bartolo-Pérez ◽  
B. Escobar-Morales ◽  
F. J. Rodríguez-Varela ◽  
...  
Keyword(s):  
Metal Free ◽  
Orr Activity ◽  
Communication Synthesis

scholarly journals Synthesis of P- and N-doped carbon catalysts for the oxygen reduction reaction via controlled phosphoric acid treatment of folic acid

2019 ◽  
Author(s):  
Rieko Kobayashi ◽  
Takafumi Ishii ◽  
Yasuo Imashiro ◽  
Jun-ichi Ozaki
Keyword(s):  
Folic Acid ◽  
Phosphoric Acid ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Acid Treatment ◽  
Reduction Reaction ◽  
P Content ◽  
Orr Activity ◽  
Carbon Catalysts ◽  
Pyridinic N

Herein, we synthesized N- and P-doped carbons (PN-doped carbons) by controlled phosphoric acid treatment (CPAT) of folic acid (FA) and probed their ability to catalyze the oxygen reduction reaction at the cathode of a fuel cell. Precursors obtained by heating FA in the presence of phosphoric acid at temperatures of 400–1000 °C were further annealed at 1000 °C to afford PN-doped carbons. The extent of precursor P-doping was maximized at 700 °C, and the use of higher temperatures resulted in activation and increased porosity rather than in increased P content. The P/C atomic ratios of PN-doped carbons were well correlated with those of precursors, which indicated that CPAT was well suited for the preparation of PN-doped carbons. Carbon prepared using a CPAT temperature of 700 °C exhibited the highest oxygen reduction reaction (ORR) activity and was shown to contain –C–PO2 and –C–PO3 moieties as the major P species and pyridinic N as the major N species; moreover, no N–P bonds were detected. The presence of –C–PO2 and –C–PO3 units was concluded to decrease the work function and thus raise the Fermi level above the standard O2/H2O reduction potential, which resulted in enhanced ORR activity. Finally, CPAT was concluded to be applicable to the synthesis of PN-doped carbons from N-containing organic compounds other than FA.

Fast and Scalable Hydrodynamic Synthesis of MnO2/Defect-Free Graphene Nanocomposites with High Rate Capability and Long Cycle Life

2018 ◽  
Vol 10 (41) ◽  
pp. 35250-35259 ◽  
Author(s):  
Seok Bok Hong ◽  
Jae-Min Jeong ◽  
Heon Gyu Kang ◽  
Donghyuk Seo ◽  
Younghyun Cha ◽  
...  
Keyword(s):  
Rate Capability ◽  
Cycle Life ◽  
High Rate ◽  
High Rate Capability ◽  
Graphene Nanocomposites ◽  
Long Cycle ◽  
Long Cycle Life ◽  
Free Graphene

NaCl protected synthesis of 3D hierarchical metal-free porous nitrogen-doped carbon catalysts for the oxygen reduction reaction in acidic electrolyte

2019 ◽  
Vol 55 (61) ◽  
pp. 9023-9026 ◽  
Author(s):  
Rui Wu ◽  
Xiaoju Wan ◽  
Jianghai Deng ◽  
Xun Huang ◽  
Siguo Chen ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Performance ◽  
Porous Metal ◽  
Reduction Reaction ◽  
Protective Agent ◽  
Metal Free ◽  
Hierarchical Porous ◽  
Carbon Catalysts ◽  
Nitrogen Doped Carbon

A high-performance 3D hierarchical porous metal-free N-doped carbon catalyst for oxygen reduction reaction in acidic medium was synthesized with ZnO as a mesoporous template and NaCl as both a macroporous template and a structure protective agent.

Self-assembly of noble metal-free graphene–copper plasmonic metasurfaces

2020 ◽  
Vol 8 (34) ◽  
pp. 11896-11905 ◽  
Author(s):  
Iolanda Di Bernardo ◽  
Jonathan Bradford ◽  
Zelio Fusco ◽  
Jireh Mendoza ◽  
Thanh Tran-Phu ◽  
...  
Keyword(s):  
Noble Metal ◽  
Self Assembly ◽  
Plasmonic Sensors ◽  
Metal Free ◽  
Free Graphene

Graphene-protected Cu nanoislands as VOC plasmonic sensors.

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