High surface area N/O co-doped carbon materials: Selective electrocatalysts for O2 reduction to H2O2

Herein, a facile dopamine assisted one-pot synthesis approach is proposed for the preparation of porous carbon with a specific surface area (SSA) up to 2593 m2/g through the direct pyrolysis of a mixture of glucose, NH4Cl, and dopamine hydrochloride (DAH). The glucose is adopted as the carbon source and foaming agent, NH4Cl is used as the blowing agent, and DAH is served as collaborative carbon precursor as well as the nitrogen source for the first time. The effect of dopamine on the component, structure, and SSA of the as-prepared porous carbon materials are systematically studied. The moderate addition of dopamine, which influences the condensation and polymerization of glucose, matches better with ammonium salt decomposition. The SSA of porous carbon increases first and then decreases with the increasing amount of dopamine. In our case, the porous carbon produced with 5 wt% dopamine (PC-5) achieves the maximum SSA of up to 2593 m2/g. Accordingly, it also shows the greatest electrochemical performance. The PC-5 shows a capacitance of 96.7 F/g calculated from the discharge curve at 1 A/g. It also has a good capacitive rate capacity, the specific capacitance can still maintain 80%, even at a high current density of 10 A/g. Moreover, PC-5 exhibits a good cycling stability of 98.1% capacitive retention after 1000 cycles. The proposed method may show promising prospects for preparing porous carbon materials as advanced energy storage materials, storage, and catalyst supports.

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Rich N/O/S co-doped porous carbon with a high surface area from silkworm cocoons for superior supercapacitors

New Journal of Chemistry ◽

10.1039/c9nj04195h ◽

2019 ◽

Vol 43 (48) ◽

pp. 19372-19378 ◽

Cited By ~ 1

Author(s):

Jianyu Huang ◽

Simin Liu ◽

Zifang Peng ◽

Zhuoxian Shao ◽

Yuanyuan Zhang ◽

...

Keyword(s):

Surface Area ◽

Porous Carbon ◽

Electrode Materials ◽

Synergistic Effects ◽

High Surface ◽

High Surface Area ◽

Porous Carbons ◽

Co Doped

The synergistic effects of high surface area and abundant heteroatoms make porous carbons superior electrode materials.

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Structural Flexibility in Activated Carbon Materials Prepared under Harsh Activation Conditions

Materials ◽

10.3390/ma12121988 ◽

2019 ◽

Vol 12 (12) ◽

pp. 1988 ◽

Cited By ~ 4

Author(s):

Fabiano Gomes Ferreira de Paula ◽

Ignacio Campello-Gómez ◽

Paulo Fernando Ribeiro Ortega ◽

Francisco Rodríguez-Reinoso ◽

Manuel Martínez-Escandell ◽

...

Keyword(s):

Activated Carbon ◽

Surface Area ◽

Structural Changes ◽

Organic Molecules ◽

Carbon Materials ◽

High Surface ◽

High Surface Area ◽

Koh Activation ◽

3D Network ◽

Activation Conditions

Although traditionally high-surface area carbon materials have been considered as rigid structures with a disordered three dimensional (3D) network of graphite microdomains associated with a limited electrical conductivity (highly depending on the porous structure and surface chemistry), here we show for the first time that this is not the case for activated carbon materials prepared using harsh activation conditions (e.g., KOH activation). In these specific samples a clear structural re-orientation can be observed upon adsorption of different organic molecules, the structural changes giving rise to important changes in the electrical resistivity of the material. Whereas short chain hydrocarbons and their derivatives give rise to an increased resistivity, the contrary occurs for longer-chain hydrocarbons and/or alcohols. The high sensitivity of these high-surface area carbon materials towards these organic molecules opens the gate towards their application for sensing devices.

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Porous carbon materials derived from waste cotton stalk with ultra-high surface area for high performance supercapacitors

Materials Research Bulletin ◽

10.1016/j.materresbull.2021.111457 ◽

2021 ◽

pp. 111457

Author(s):

Jianshen Tian ◽

Tao Zhang ◽

Dilinuer Talifu ◽

Abulikemu Abulizi ◽

Yajun Ji

Keyword(s):

Surface Area ◽

Porous Carbon ◽

High Performance ◽

Carbon Materials ◽

High Surface ◽

High Surface Area ◽

Cotton Stalk ◽

Porous Carbon Materials

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Rice Husk-Derived High Surface Area Nanoporous Carbon Materials with Excellent Iodine and Methylene Blue Adsorption Properties

C – Journal of Carbon Research ◽

10.3390/c5010010 ◽

2019 ◽

Vol 5 (1) ◽

pp. 10 ◽

Cited By ~ 10

Author(s):

Lok Shrestha ◽

Mamata Thapa ◽

Rekha Shrestha ◽

Subrata Maji ◽

Raja Pradhananga ◽

...

Keyword(s):

Methylene Blue ◽

Surface Area ◽

Rice Husk ◽

Carbon Materials ◽

High Surface ◽

High Surface Area ◽

Nanoporous Carbon ◽

Adsorption Properties ◽

Methylene Blue Adsorption ◽

Nanoporous Carbon Materials

Iodine and methylene blue adsorption properties of the high surface area nanoporous carbon materials derived from agro-waste and rice husk is reported. Rice husk was pre-carbonized at 300 °C in air followed by leaching out the silica nanoparticles by extraction with sodium hydroxide solution. The silica-free rice husk char was mixed with chemical activating agents sodium hydroxide (NaOH), zinc chloride (ZnCl2), and potassium hydroxide (KOH) separately at a mixing ratio of 1:1 (wt%) and carbonized at 900 °C under a constant flow of nitrogen. The prepared carbon materials were characterized by scanning electron microscopy (SEM), Fourier transformed-infrared spectroscopy (FT-IR), powder X-ray diffraction (pXRD), and Raman scattering. Due to the presence of bimodal micro- and mesopore structures, KOH activated samples showed high specific surface area ca. 2342 m2/g and large pore volume ca. 2.94 cm3/g. Oxygenated surface functional groups (hydroxyl, carbonyl, and carboxyl) were commonly observed in all of the samples and were essentially non-crystalline porous particle size of different sizes (<200 μm). Adsorption study revealed that KOH activated samples could be excellent material for the iodine and methylene blue adsorption from aqueous phase. Iodine and methylene blue number were ca. 1726 mg/g and 608 mg/g, respectively. The observed excellent iodine and methylene blue adsorption properties can be attributed to the well-developed micro- and mesopore structure in the carbon material. This study demonstrates that the agricultural waste, rice husk, and derived nanoporous carbon materials would be excellent adsorbent materials in water purifications.

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High Surface Area Nanoporous Graphitic Carbon Materials Derived from Lapsi Seed with Enhanced Supercapacitance

Nanomaterials ◽

10.3390/nano10040728 ◽

2020 ◽

Vol 10 (4) ◽

pp. 728 ◽

Cited By ~ 6

Author(s):

Lok Kumar Shrestha ◽

Rekha Goswami Shrestha ◽

Subrata Maji ◽

Bhadra P. Pokharel ◽

Rinita Rajbhandari ◽

...

Keyword(s):

Surface Area ◽

Current Density ◽

Electrode Materials ◽

Carbon Materials ◽

High Surface ◽

High Surface Area ◽

Graphitic Carbon ◽

High Rate ◽

Surface Areas ◽

Nanoporous Carbon Materials

Nanoporous activated carbon materials derived from agro-wastes could be suitable low-cost electrode materials for high-rate performance electrochemical supercapacitors. Here we report high surface area nanoporous carbon materials derived from Lapsi seed agro-waste prepared by zinc chloride (ZnCl2) activation at 700 °C. Powder X-ray diffraction (pXRD) and Raman scattering confirmed the amorphous structure of the resulting carboniferous materials, which also incorporate oxygen-containing functional groups as confirmed by Fourier transform infrared (FTIR) spectroscopy. Scanning and transmission electron microscopy (SEM and TEM) analyses revealed the granular, nanoporous structures of the materials. High-resolution TEM (HR-TEM) confirmed a graphitic carbon structure containing interconnected mesopores. Surface areas and pore volumes of the materials were found, respectively, in the ranges from 931 to 2272 m2 g−1 and 0.998 to 2.845 cm3 g−1, and are thus superior to commercially available activated carbons. High surface areas, large pore volumes and interconnected mesopore structures of these Lapsi seed-derived nanoporous carbon materials lead to their excellent electrochemical supercapacitance performance in aqueous electrolyte (1 M H2SO4) with a maximum specific capacitance of 284 F g−1 at a current density of 1 A g−1. Furthermore, the electrodes showed high-rate capability sustaining 67.7% capacity retention even at high current density of 20 A g−1 with excellent cycle stability achieving 99% capacitance retention even after 10,000 charge–discharge cycles demonstrating the potential of Lapsi seed derived nanoporous carbons as suitable electrode materials in high-performance supercapacitor devices.

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