Flexible Sensors and Supercapacitors Based on Carbon Nanotubes and Graphene

A special issue of Chemosensors (ISSN 2227-9040). This special issue belongs to the section "Electrochemical Devices and Sensors".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 8141

Special Issue Editors


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Research Initiative for Supra-Materials (RISM), Shinshu University, 4-17-1 Wakasato, Nagano City, 380-8553, Japan
Interests: supercapacitors, electrochemical chemosensors, surface wettability, superhydrophobicity, superoleophobicity, adsorption, adsorption-based gas separation

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Guest Editor
Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
Interests: electrochemical devices; nanomaterials; transmission electron microscopy
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Special Issue Information

Dear Colleagues,

Rapid technological development in modern society has encouraged the demand for flexible and portable devices, such as wearable sensors which can be integrated directly with the body for healthcare monitoring to provide clinically relevant data vital to maintain physical fitness, or miniaturized sensor tags for maintaining food quality, safety, and environment. Such sensors hold great promise as they possess potential for remote monitoring of the subjects with chronic conditions in the home, community, or environment.

These emerging flexible electronics require a large spectrum of flexible power sources, including flexible batteries and supercapacitors. Among them, flexible supercapacitors are preferred in several situations due to their exceptional charge speeds, ability to release large currents, and outstanding cycle lives. In addition to the standard requirements for supercapacitors, mechanical robustness in terms of stretching or twisting reliability, accompanied by high safety, is paramount for the flexible capacitive devices. Such high-performance flexible supercapacitors can power the wide range of sensors.

In order to improve the sensing, electrochemical, and mechanical performances of such flexible devices, a proper choice of active materials and device architectures is critical. A significant volume of recent research on flexible devices has been broadly focused on carbonaceous materials. Among them, the use of carbon nanotubes and graphene-based nanomaterials in high-performance sensing and energy storage is one of the most promising avenues to develop futuristic devices.

The scope of this Special Issue is to bring together current developments in flexible sensors and flexible supercapacitors with an emphasis on flexible active platforms enabled by carbon nanotubes and graphene. The scope also includes fabrication strategies of flexible/stretchable sensors as well as supercapacitors, new device design, integration, and their implementations in different applications. The list of topics this Special Issue covers incudes, but is not limited to, the following:
  • Flexible/stretchable sensors;
  • Flexible/stretchable supercapacitors;
  • Carbon nanotubes;
  • Graphene and related materials;
  • Synthesis techniques for flexible sensors/supercapacitors;
  • Engineering strategies for flexible sensors/supercapacitors;
  • Micro-patterned (MEMS) based flexible sensors/supercapacitors;
  • Carbon nanotubes as a flexible scaffold for sensing probe/pseudocapacitive materials;
  • Graphene as a flexible scaffold for sensing probe/pseudocapacitive materials;
  • Self-powered sensors coupled with supercapacitors;
  • Hybrid forms—graphene/carbon nanotubes with functionalization/doping;
  • The state of the art and future prospects: problems and possible solutions.

Dr. Sanjeev Kumar Ujjain
Dr. Alexey Glushenkov
Guest Editors

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Keywords

  • Flexible/stretchable sensors;
  • Flexible/stretchable supercapacitors;
  • Carbon nanotubes;
  • Graphene and related materials;
  • Synthesis techniques for flexible sensors/supercapacitors;
  • Engineering strategies for flexible sensors/supercapacitors;
  • Micro-patterned (MEMS) based flexible sensors/supercapacitors;
  • Carbon nanotubes as a flexible scaffold for sensing probe/pseudocapacitive materials;
  • Graphene as a flexible scaffold for sensing probe/pseudocapacitive materials;
  • Self-powered sensors coupled with supercapacitors;
  • Hybrid forms—graphene/carbon nanotubes with functionalization/doping;
  • The state of the art and future prospects: problems and possible solutions.

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Published Papers (2 papers)

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Research

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13 pages, 12526 KiB  
Article
Biochar from Spent Malt Rootlets and Its Application to an Energy Conversion and Storage Device
by John Vakros, Ioannis D. Manariotis, Vassilios Dracopoulos, Dionissios Mantzavinos and Panagiotis Lianos
Chemosensors 2021, 9(3), 57; https://doi.org/10.3390/chemosensors9030057 - 22 Mar 2021
Cited by 14 | Viewed by 3055
Abstract
Activated carbon obtained from biomass wastes was presently studied in order to evaluate its applicability in an energy storage device. Biochar was obtained by the carbonization of spent malt rootlets and was further processed by mild treatment in NaOH. The final product had [...] Read more.
Activated carbon obtained from biomass wastes was presently studied in order to evaluate its applicability in an energy storage device. Biochar was obtained by the carbonization of spent malt rootlets and was further processed by mild treatment in NaOH. The final product had a specific surface of 362 m2 g−1 and carried Na, P and a few mineral sites. This material was first characterized by several techniques. Then it was used to make a supercapacitor electrode, which reached a specific capacitance of 156 F g−1. The supercapacitor electrode was combined with a photocatalytic fuel cell, making a simple three-electrode device functioning with a single alkaline electrolyte. This device allows solar energy conversion and storage at the same time, promoting the use of biomass wastes for energy applications. Full article
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Review

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25 pages, 5448 KiB  
Review
Recent Trends in Carbon Nanotube Electrodes for Flexible Supercapacitors: A Review of Smart Energy Storage Device Assembly and Performance
by Himadri Tanaya Das, Swapnamoy Dutta, Tamilarasan Elango Balaji, Nigamananda Das, Payaswini Das, Neelu Dheer, Rajni Kanojia, Preety Ahuja and Sanjeev Kumar Ujjain
Chemosensors 2022, 10(6), 223; https://doi.org/10.3390/chemosensors10060223 - 13 Jun 2022
Cited by 39 | Viewed by 4279
Abstract
In order to upgrade existing electronic technology, we need simultaneously to advance power supply devices to match emerging requirements. Owing to the rapidly growing wearable and portable electronics markets, the demand to develop flexible energy storage devices is among the top priorities for [...] Read more.
In order to upgrade existing electronic technology, we need simultaneously to advance power supply devices to match emerging requirements. Owing to the rapidly growing wearable and portable electronics markets, the demand to develop flexible energy storage devices is among the top priorities for humankind. Flexible supercapacitors (FSCs) have attracted tremendous attention, owing to their unrivaled electrochemical performances, long cyclability and mechanical flexibility. Carbon nanotubes (CNTs), long recognized for their mechanical toughness, with an elastic strain limit of up to 20%, are regarded as potential candidates for FSC electrodes. Along with excellent mechanical properties, high electrical conductivity, and large surface area, their assemblage adaptability from one-dimensional fibers to two-dimensional films to three-dimensional sponges makes CNTs attractive. In this review, we have summarized various assemblies of CNT structures, and their involvement in various device configurations of FSCs. Furthermore, to present a clear scenario of recent developments, we discuss the electrochemical performance of fabricated flexible devices of different CNT structures and their composites, including additional properties such as compressibility and stretchability. Additionally, the drawbacks and benefits of the study and further potential scopes are distinctly emphasized for future researchers. Full article
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