Tobacco stalk-derived carbon prepared by one-step molten salt carbonization for supercapacitor

High-performance capacitive carbon materials, derived from tobacco stalk, were prepared by a one-step carbonization process in molten carbonate. Owing to the high specific surface area (SSA) (1165.9 m2 g[Formula: see text] and heteroatom doping by the activation effect of molten salt medium for 3 h, the as-obtained carbon material with hierarchically porous structure exhibits an ideal capacitive property with delivering specific capacitances of 219.8, 188.0, 176.4, and 168.4 F g[Formula: see text] at 0.2, 0.5, 1, and 2 A g[Formula: see text], respectively, acceptable rate performance with 76.6% capacitance retention in range of 0.2–2 A g[Formula: see text], and good cyclic stability with 93% capacitance retention after 3000 charge–discharge cycles at 1 A g[Formula: see text], as well as energy density of 30.5 Wh kg[Formula: see text] at 0.2 A g[Formula: see text] and power density of 989.6 W kg[Formula: see text] at 2 A g[Formula: see text] in 1 mol L[Formula: see text] H2SO4 aqueous solution using a three-electrode system. Moreover, it delivers specific capacitances of 143.3, 140.2, 137.4, and 134.3 F g[Formula: see text] at 0.2, 0.5, 1, and 2 A g[Formula: see text], respectively, and excellent rate performance with 93.7% capacitance retention in range of 0.2–2 A g[Formula: see text], as well as energy density of 4.9 Wh kg[Formula: see text] at 0.2 A g[Formula: see text] and power density of 488.6 W kg[Formula: see text] at 2 A g[Formula: see text] in 6 mol L[Formula: see text] KOH aqueous solution using a symmetrical two-electrode system. The correlation between hierarchically porous structure with heteroatom doping and capacitive performance is also discussed.

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One-Step Conversion from Core–Shell Metal–Organic Framework Materials to Cobalt and Nitrogen Codoped Carbon Nanopolyhedra with Hierarchically Porous Structure for Highly Efficient Oxygen Reduction

ACS Applied Materials & Interfaces ◽

10.1021/acsami.7b00736 ◽

2017 ◽

Vol 9 (19) ◽

pp. 16109-16116 ◽

Cited By ~ 65

Author(s):

Zhaowen Hu ◽

Zhengping Zhang ◽

Zhilin Li ◽

Meiling Dou ◽

Feng Wang

Keyword(s):

Porous Structure ◽

Oxygen Reduction ◽

Metal Organic Framework ◽

Core Shell ◽

Hierarchically Porous ◽

Framework Materials ◽

Hierarchically Porous Structure ◽

Highly Efficient ◽

Metal Organic ◽

One Step

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An Ultra-microporous Carbon Material Boosting Integrated Capacitance for Cellulose-Based Supercapacitors

Nano-Micro Letters ◽

10.1007/s40820-020-0393-7 ◽

2020 ◽

Vol 12 (1) ◽

Cited By ~ 6

Author(s):

Chenfeng Ding ◽

Tianyi Liu ◽

Xiaodong Yan ◽

Lingbo Huang ◽

Seungkon Ryu ◽

...

Keyword(s):

Energy Density ◽

Porous Structure ◽

Electrode Materials ◽

High Current Density ◽

Synergistic Effects ◽

High Specific Surface Area ◽

Microporous Carbon ◽

High Current ◽

Ion Storage ◽

One Step

AbstractA breakthrough in advancing power density and stability of carbon-based supercapacitors is trapped by inefficient pore structures of electrode materials. Herein, an ultra-microporous carbon with ultrahigh integrated capacitance fabricated via one-step carbonization/activation of dense bacterial cellulose (BC) precursor followed by nitrogen/sulfur dual doping is reported. The microporous carbon possesses highly concentrated micropores (~ 2 nm) and a considerable amount of sub-micropores (< 1 nm). The unique porous structure provides high specific surface area (1554 m2 g−1) and packing density (1.18 g cm−3). The synergistic effects from the particular porous structure and optimal doping effectively enhance ion storage and ion/electron transport. As a result, the remarkable specific capacitances, including ultrahigh gravimetric and volumetric capacitances (430 F g−1 and 507 F cm−3 at 0.5 A g−1), and excellent cycling and rate stability even at a high current density of 10 A g−1 (327 F g−1 and 385 F cm−3) are realized. Via compositing the porous carbon and BC skeleton, a robust all-solid-state cellulose-based supercapacitor presents super high areal energy density (~ 0.77 mWh cm−2), volumetric energy density (~ 17.8 W L−1), and excellent cyclic stability.

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Preparation and Characterization of WO3/ZrO2 Solid Acid Catalyst with Hierarchically Porous Structure

CHINESE JOURNAL OF CATALYSIS (CHINESE VERSION) ◽

10.3724/sp.j.1088.2011.01203 ◽

2011 ◽

Vol 32 (4) ◽

pp. 647-651

Author(s):

Chongcheng CHEN ◽

Hangrong CHEN ◽

Jianchang YU ◽

Zhengqing YE ◽

Jianlin SHI

Keyword(s):

Porous Structure ◽

Solid Acid ◽

Solid Acid Catalyst ◽

Acid Catalyst ◽

Hierarchically Porous ◽

Hierarchically Porous Structure

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A Simple Synthesis of the Anticancer Drug Altretamine

Letters in Organic Chemistry ◽

10.2174/1570178617666200210111041 ◽

2020 ◽

Vol 17 (8) ◽

pp. 628-630

Author(s):

Vu Binh Duong ◽

Pham Van Hien ◽

Tran Thai Ngoc ◽

Phan Dinh Chau ◽

Tran Khac Vu

Keyword(s):

Aqueous Solution ◽

Anticancer Drug ◽

Potassium Hydroxide ◽

Large Scale ◽

Synthesis Method ◽

Practical Method ◽

Cyanuric Chloride ◽

Simple Synthesis ◽

High Yield ◽

One Step

A simple and practical method for the synthesis on a large scale of altretamine (1), a wellknown antitumor drug, has been successfully developed. The synthesis method involves the conversion of cyanuric chloride (2) into altretamine (1) by dimethylamination of 2 with an aqueous solution of 40% dimethylamine and potassium hydroxide in 1, -dioxan 4in one step to give altretamine (1) in high yield.

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One-step controlled synthesis of anisotropic gold nanostructures with aniline as the reductant in aqueous solution

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2006.12.070 ◽

2007 ◽

Vol 309 (2) ◽

pp. 518-523 ◽

Cited By ~ 29

Author(s):

Zhirui Guo ◽

Yu Zhang ◽

Lan Huang ◽

Meng Wang ◽

Jing Wang ◽

...

Keyword(s):

Aqueous Solution ◽

Gold Nanostructures ◽

Controlled Synthesis ◽

One Step

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Highly efficient evaporative cooling by all-day water evaporation using hierarchically porous biomass

Scientific Reports ◽

10.1038/s41598-021-96303-w ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jihun Choi ◽

Hansol Lee ◽

Bokyeong Sohn ◽

Minjae Song ◽

Sangmin Jeon

Keyword(s):

Porous Structure ◽

Fiber Length ◽

Evaporation Rate ◽

Water Evaporation ◽

Thickness Direction ◽

Hierarchically Porous ◽

Hierarchically Porous Structure ◽

Length Direction ◽

Luffa Sponge ◽

Fiber Thickness

AbstractWe developed a 3D solar steam generator with the highest evaporation rate reported so far using a carbonized luffa sponge (CLS). The luffa sponge consisted of entangled fibers with a hierarchically porous structure; macropores between fibers, micro-sized pores in the fiber-thickness direction, and microchannels in the fiber-length direction. This structure remained after carbonization and played an important role in water transport. When the CLS was placed in the water, the microchannels in the fiber-length direction transported water to the top surface of the CLS by capillary action, and the micro-sized pores in the fiber-thickness direction delivered water to the entire fiber surface. The water evaporation rate under 1-sun illumination was 3.7 kg/m2/h, which increased to 14.5 kg/m2/h under 2 m/s wind that corresponded to the highest evaporation rate ever reported under the same condition. The high evaporation performance of the CLS was attributed to its hierarchically porous structure. In addition, it was found that the air temperature dropped by 3.6 °C when the wind passed through the CLS because of the absorption of the latent heat of vaporization. The heat absorbed by the CLS during water evaporation was calculated to be 9.7 kW/m2 under 1-sun illumination and 2 m/s wind, which was 10 times higher than the solar energy irradiated on the same area (1 kW/m2).

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