Hierarchically porous metal-free carbon with record high mass activity for oxygen reduction and Zn-air batteries

In this paper we report the synthesis of a N, S co-doped metal free carbon cryogel obtained from a marine biomass derived precursor using urea as nitrogen source. Natural carrageenan intrinsically contains S and inorganic salt. The latter also serves as an activating agent during the pyrolytic step. The overall 11.6 atomic % surface heteroatom concentration comprises 5% O, 4.6% N and 1% S. The purified and annealed final carbon (CA) has a hierarchical pore structure of micro-, meso- and macropores with an apparent surface area of 1070 m2/g. No further treatment was applied. The gas adsorption potential of the samples was probed with H2, CO2 and CH4, while the electrocatalytic properties were tested in an oxygen reduction reaction. The atmospheric CO2 and CH4 storage capacity at 0 °C in the low pressure range is very similar to that of HKUST-1, with the CO2/CH4 selectivity below 20 bar, even exceeding that of the MOF, indicating the potential of CA in biogas separation. The electrocatalytic behavior was assessed in an aqueous KOH medium. The observed specific gravimetric capacitance 377 F/g was exceeded only in B, N dual doped and/or graphene doped carbons from among metal free electrode materials. The CA electrode displays almost the same performance as a commercial 20 wt% Pt/C electrode. The oxygen reduction reaction (ORR) exhibits the 4-electron mechanism. The 500-cycle preliminary stability test showed only a slight increase of the surface charge.

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Metal-free ovalbumin-derived N-S-co-doped nanoporous carbon materials as efficient electrocatalysts for oxygen reduction reaction

Applied Surface Science ◽

10.1016/j.apsusc.2018.10.140 ◽

2019 ◽

Vol 467-468 ◽

pp. 75-83 ◽

Cited By ~ 13

Author(s):

André L. Cazetta ◽

Lucas Spessato ◽

Karen C. Bedin ◽

Isis P.F.A. Souza ◽

Rafael A. Araújo ◽

...

Keyword(s):

Oxygen Reduction Reaction ◽

Oxygen Reduction ◽

Carbon Materials ◽

Nanoporous Carbon ◽

Reduction Reaction ◽

Metal Free ◽

Nanoporous Carbon Materials ◽

Co Doped

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

Chemical Communications ◽

10.1039/c9cc02986a ◽

2019 ◽

Vol 55 (61) ◽

pp. 9023-9026 ◽

Cited By ~ 16

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.

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TiO 2 Nanorods Co‐decorated with Metal‐Free Carbon Materials for Boosted Photoelectrochemical Water Oxidation

ChemElectroChem ◽

10.1002/celc.202000032 ◽

2020 ◽

Vol 7 (3) ◽

pp. 792-799 ◽

Cited By ~ 3

Author(s):

Weiqian Kong ◽

Xiaofan Zhang ◽

Binbin Chang ◽

Yanzhen Guo ◽

Yipeng Li ◽

...

Keyword(s):

Water Oxidation ◽

Carbon Materials ◽

Free Carbon ◽

Metal Free ◽

Photoelectrochemical Water Oxidation

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Enhancement mechanism of sulfur dopants on the catalytic activity of N and P co-doped three-dimensional hierarchically porous carbon as a metal-free oxygen reduction electrocatalyst

Catalysis Science & Technology ◽

10.1039/c9cy01387c ◽

2019 ◽

Vol 9 (21) ◽

pp. 5906-5914 ◽

Cited By ~ 6

Author(s):

Yongxi Zan ◽

Zhengping Zhang ◽

Meiling Dou ◽

Feng Wang

Keyword(s):

Catalytic Activity ◽

Oxygen Reduction ◽

Porous Carbon ◽

Three Dimensional ◽

Nitrogen And Phosphorus ◽

Free Oxygen ◽

Hierarchically Porous ◽

Metal Free ◽

Enhancement Mechanism ◽

Co Doped

A sulfur, nitrogen and phosphorus ternary-doped cattle-bone-derived hierarchically porous carbon metal-free electrocatalyst was synthesized, exhibiting superior oxygen reduction performance compared to Pt/C.

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