Carbon Thin Film Wrapped around a Three‐Dimensional Nitrogen‐Doped Carbon Scaffold for Superior‐Performance Supercapacitors

Luo

ACS Appl. Mater. Interfaces

et al. 2018

Here, we demonstrate the in situ growth of SnO2 nanosheets on a freestanding carbonized eggshell membrane (CEM), which provides three-dimensional, bicontinuous electron and ion transport pathways through a massively interconnected carbon fiber skeleton and interpenetrated pore network, respectively. This CEM has other advantages such as the ability to alleviate mechanical stress during cycling as a buffer matrix. When used as an additive-free anode in a sodium-ion battery, SnO2 nanosheets can realize a complete electrochemical reaction and maintain good cycling stability with the help of a CEM. For instance, SnO2 nanosheets delivered a high reversible capacity of 656 mA h g–1 in the 5th cycle at 0.1 A g–1, approaching 98% of its theoretical specific capacity, and maintained a high reversible specific capacity of 420 mA h g–1 after 200 cycles at 0.2 A g–1.

Section: Resultsmentioning

confidence: 85%

Section: ■ Results and Discussionmentioning

confidence: 99%

SnO₂ Nanosheets Anchored on a 3D, Bicontinuous Electron and Ion Transport Carbon Network for High-Performance Sodium-Ion Batteries

Luo

ACS Appl. Mater. Interfaces

et al. 2018

“…Due to the excellent tensile and compressive properties of MS and carbonized MS, the 3D structured skeleton of MS can turn into elastic nitrogen-doped carbon foam after calcination, in which the interconnected structure can facilitate electrolyte transport. Several studies have been done on high-performance supercapacitors with carbonized MS as electrodes. − Carbonized MS can be used directly as a supercapacitor electrode because of its high nitrogen content and relatively high conductivity.…”

Section: Electrochemical Electrodementioning

confidence: 99%

Design of Melamine Sponge-Based Three-Dimensional Porous Materials toward Applications

Feng

Yao

2018

Ind. Eng. Chem. Res.

147

Due to the low density, high porosity, three-dimensional (3D) pore structure, high nitrogen content, and excellent mechanical properties, melamine sponge (MS) has been widely used as the main building block to design and obtain 3D porous materials. Moreover, N-doped porous carbon foam can be formed via a simple carbonization of MS, thus making such carbon foam also an ideal carbon material used either directly or as support to load other materials. So far, many studies have been reported on the modification of MS, carbonized MS, and MS-based composite materials in various applications including oil/water separation, water disinfection, adsorption, fire resistance, electrochemistry, strain/stress sensor, catalysis, and so on. In this Review, structure design of such MS-based materials and modification methods are summarized and discussed, and the obstacles and suggestions for how to design and synthesize such materials with better performance are provided, aiming to promote the wide application of MS in various fields.

“…Meeting the electricity demand of wearable and mobile devices is crucial to their large-scale application. Thus, supercapacitors’ unique advantages have been increasingly favored in this field of research. − As a type of electrochemical capacitor, their features including high power density, low energy density, and rapid charging are several times better compared to conventional batteries. , Supercapacitors are essential in several diverse applications, such as industrial energy management starter units, , portable electronics, , instant switches, , regenerative braking systems, , and uninterruptible power supplies. , They are expected to overcome usage barriers among batteries and capacitors to achieve quick charging/discharging capability at a specific moderate energy.…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanofibers-Assembled Tungsten Oxide as Unique Hybrid Electrode Materials for High-Performance Symmetric Supercapacitors

Sun

Bai

et al. 2021

Energy Fuels

It is crucial to balance the energy supply and demand of wearable and mobile electrical devices for their widespread applications. Supercapacitors have attracted increasing attentions in this field due to their unique advantages. This work studied the preparation of highly graphitized WO 3 −CNFs as promising flexible electrode materials for fiber-shaped supercapacitors. Tungsten oxide, a prospective energy storage material owing to its n-type semiconductor property, was integrated with carbon nanofibers (CNFs) to synthesize nanostructured WO 3 − CNFs through a combined electrospinning and hydrothermal method. A variety of amounts of ammonium metatungst (AMT) were screened and WO 3 -RCNFs8 (8 mg AMT in 20 mL water) was proven to deliver the maximum specific capacitance (381.40 F g −1 at 0.5 A g −1 ), capacitance retention (up to 111.87% after 5000 cycles), and high-rate capability (58.68% retention in specific capacitance at 20 versus 0.3 A g −1 ). A symmetric flexible solid-state supercapacitor (SFS) device was assembled using the asprepared WO 3 −CNFs8 as electrode materials. The maximum energy density of 4.28 Wh kg −1 with a power density of 3356.90 W kg −1 was achieved. The superior electrochemical performances can be explained by the synergistic effect of the n-type semiconductor property of WO 3 and the excellent charge transfer ability of CNFs, which could attract more charges into the electrode throughout charging state and release them rapidly during the discharging state. The n-type semiconductor enhanced the electrochemical behavior of CNFs and played a vital role in achieving high specific capacitance. The new procedure of preparing flexible electrode materials with enhanced charge storage/release capacity was investigated, which is chiefly essential for superior-performance energy storage devices.