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

2020 ◽  
Vol 12 (1) ◽  
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.

One-step Synthesis of Amorphous Nickel Iron Phosphide Hierarchical Nanostructures for Water Electrolysis with Superb Stability at High Current Density

2021 ◽  
Author(s):  
Yuefeng Yu ◽  
Xun He ◽  
Rong Li ◽  
Xinglong Gou
Keyword(s):  
High Performance ◽  
High Current Density ◽  
Water Electrolysis ◽  
Bifunctional Catalysts ◽  
High Current ◽  
Hierarchical Nanostructures ◽  
Iron Phosphide ◽  
Nickel Iron ◽  
Metal Free ◽  
One Step

Development of noble-metal-free high-performance bifunctional catalysts for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is essential but challenging for hydrogen production from water electrolysis. Herein, amorphous bimetallic...

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

2021 ◽  
pp. 2151021
Author(s):  
Yuxuan Liu ◽  
Xinhua Cheng ◽  
Shenghui Zhang
Keyword(s):  
Aqueous Solution ◽  
Energy Density ◽  
Porous Structure ◽  
Molten Salt ◽  
Electrode System ◽  
Rate Performance ◽  
Heteroatom Doping ◽  
Hierarchically Porous Structure ◽  
One Step ◽  
Tobacco Stalk

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.

Nanocrystalline FeF3 and MF2 (M = Fe, Co, and Mn) from metal trifluoroacetates and their Li(Na)-ion storage properties

2017 ◽  
Vol 5 (16) ◽  
pp. 7383-7393 ◽  
Author(s):  
Christoph P. Guntlin ◽  
Tanja Zünd ◽  
Kostiantyn V. Kravchyk ◽  
Michael Wörle ◽  
Maryna I. Bodnarchuk ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Electrode Materials ◽  
Positive Electrode ◽  
Ion Storage ◽  
Metal Trifluoroacetates ◽  
Storage Properties ◽  
Positive Electrode Materials

With demands placed on batteries constantly increasing, new positive electrode materials with higher energy density, satisfactory power density, and long-term cycling capabilities, are desired.

Preparation of lignite-based activated carbon with high specific capacitance for electrochemical capacitors

2015 ◽  
Vol 08 (04) ◽  
pp. 1550031 ◽  
Author(s):  
Baolin Xing ◽  
Jianliang Cao ◽  
Yan Wang ◽  
Guiyun Yi ◽  
Chuanxiang Zhang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Electron Microscope ◽  
Specific Capacitance ◽  
Current Density ◽  
Electrode Materials ◽  
High Current Density ◽  
Electrochemical Capacitors ◽  
High Specific Capacitance ◽  
High Current ◽  
Charge Discharge

A lignite-based activated carbon (LAC) for electrochemical capacitors (ECs) was prepared from high moisture lignite by KOH activation, and the as-prepared sample was characterized by the N 2-sorption, scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS) techniques. The electrochemical performances of ECs with activated carbon as electrodes in 3 M KOH aqueous solution were evaluated by constant current charge-discharge and cyclic voltammetry. The LAC exhibits a well-developed surface area of 2581 m2/g, a relative wide pore size distribution of 0.5–10 nm. The ECs with LAC as electrode materials presents a high specific capacitance of 392 F/g at a low current density of 50 mA/g, and still remains 315 F/g even at a high current density of 5 A/g. The residual specific capacitance is as high as 92.9% after 2000 cycles. Compared with the commercial activated carbon (Maxsorb: Commercial product, Kansai, Japan), the LAC based electrode materials shows superior capacitive performance in terms of specific capacitance and charge–discharge performance at the high current density.

N, S, O Self-Doped Porous Carbon Nanoarchitectonics Derived from Pinecone with Outstanding Supercapacitance Performances

2020 ◽  
Vol 20 (5) ◽  
pp. 2728-2735 ◽  
Author(s):  
Di Zhang ◽  
Yanchun Xue ◽  
Jiale Chen ◽  
Xingmei Guo ◽  
Dandan Yang ◽  
...  
Keyword(s):  
Porous Carbon ◽  
Electrode Materials ◽  
Low Cost ◽  
High Specific Capacitance ◽  
High Specific Surface Area ◽  
Koh Activation ◽  
Double Layer Capacitor ◽  
Symmetric Supercapacitor ◽  
Biomass N ◽  
One Step

Biomass-derived porous carbons are considered as one of the most promising electrode materials for supercapacitors due to their low-cost and natural abundance. In this work, pinecone is used to fabricate biomass N, S, O-doped porous carbon via one-step carbonization process with KOH activation. By optimizing the additive amount of KOH and calcination temperature, the asprepared product shows a high specific surface area and pore volume up to 1593.8 m2 g−1 and 0.8582 cm3 g−1, respectively. As an electric double-layer capacitor (EDLC) electrode, the N, S, O-doped porous carbon exhibits a high specific capacitance of 285 F g−1 at 0.5 A g−1 and good rate performance with a capacitance retention of 78.6% from 0.5 to 20 A g−1. Furthermore, the as-assembled symmetric supercapacitor with 6 mol L−1 KOH as electrolyte possesses a promising energy density of 6.34 Wh kg−1 and a power density of 250 W kg−1. Outstanding cycling stability was also demonstrated with 94.4% capacitance retention after 10,000 charge/discharge cycles at 1 A g−1.

Excellent performance of carbon-coated TiO2/Li4Ti5O12 composites with low Li/Ti ratio for Li-ion storage

RSC Advances ◽  
2015 ◽  
Vol 5 (113) ◽  
pp. 93155-93161 ◽  
Author(s):  
Wei Yang ◽  
Xue Bai ◽  
Tao Li ◽  
Yuan-Yuan Ma ◽  
Yong-Xin Qi ◽  
...  
Keyword(s):  
Current Density ◽  
High Current Density ◽  
Cycling Performance ◽  
High Rate ◽  
High Current ◽  
Excellent Performance ◽  
Ion Storage ◽  
Carbon Coated ◽  
Li Ion

Carbon-coated TiO2/Li4Ti5O12 composites with Li : Ti = 4 : 8 display high rate capacities and excellent long-term cycling performance at high current density.

Bifunctional CoNi/CoFe2O4 /Ni foam electrodes for efficient overall water splitting at a high current density

2018 ◽  
Vol 6 (39) ◽  
pp. 19221-19230 ◽  
Author(s):  
Shasha Li ◽  
Suchada Sirisomboonchai ◽  
Akihiro Yoshida ◽  
Xiaowei An ◽  
Xiaogang Hao ◽  
...  
Keyword(s):  
Porous Structure ◽  
Water Splitting ◽  
Current Density ◽  
High Current Density ◽  
Nickel Foam ◽  
High Current ◽  
Ni Foam ◽  
Overall Water Splitting

An electrocatalyst composed of CoNi(hydroxide) nanosheets and flower-like CoFe2O4 particles with multiple porous structure is successfully deposited on nickel foam and applied for overall water splitting.

Construction of strawberry-like Ni3S2@Co9S8 heteronanoparticle-embedded biomass-derived 3D N-doped hierarchical porous carbon for ultrahigh energy density supercapacitors

2019 ◽  
Vol 7 (29) ◽  
pp. 17345-17356 ◽  
Author(s):  
Shifu Wang ◽  
Zuoyi Xiao ◽  
Shangru Zhai ◽  
Haisong Wang ◽  
Weijie Cai ◽  
...  
Keyword(s):  
Energy Density ◽  
Porous Structure ◽  
Porous Carbon ◽  
Electrode Materials ◽  
High Surface ◽  
High Surface Area ◽  
Ultrahigh Energy ◽  
Hierarchical Porous Structure ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous

The design of advanced supercapacitors requires electrode materials that combine high surface area with a developed hierarchical porous structure to facilitate ion transport and electrolyte permeability.

Co-vacancy Co1-xS@C flower-like nanosheets derived from MOFs for high current density cycle performance and stable sodium-ion storage

2021 ◽  
Author(s):  
Pengcheng Li ◽  
Enze Xu ◽  
Jiamin Zhang ◽  
Lei Chen ◽  
Zhenjie Sun ◽  
...  
Keyword(s):  
Anode Materials ◽  
High Current Density ◽  
Stability Limit ◽  
Sodium Ion ◽  
Cycle Performance ◽  
Metal Sulfides ◽  
High Current ◽  
Ion Storage ◽  
Sodium Ion Storage ◽  
Battery Anode

Transition Metal Sulfides (TMSs) especially cobalt-based sulfides have great potential used in battery anode materials. However, the low coulomb efficiency and poor cycle stability limit the application in battery fabrication....

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