Superior environmentally friendly stretchable supercapacitor based on nitrogen-doped graphene/hydrogel and single-walled carbon nanotubes

Gilshtein, Evgeniia; Flox, Cristina; Ali, Farhan; Mehrabimatin, Bahareh; Fedorov, Fedor S.; Lin, Shaoting; Zhao, Xuanhe; Nasibulin, Albert G.; Kallio, Tanja

doi:10.1016/j.est.2020.101505

Cited by 19 publications

(6 citation statements)

References 41 publications

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“…Obviously, all the electrolytes with eutectic concentrations have remarkably lower freezing points compared with those with conventional concentrations of 1 m or 2 m CaCl 2 , MgCl 2, or NaCl. [42][43][44][45] This result is consistent with the eutectic behavior of the colligative property shown in the phase diagram.…”

Section: Physical Characteristics Of the Bressupporting

confidence: 88%

“…[ 50 ] As shown in Figure S3 (Supporting Information), the electrochemical window of 3.8 m CaCl 2 , 2.8 m MgCl 2 and 5.2 m NaCl are 2.0 V, 1.9 V, and 2.1 V, respectively. The voltage window of BREs is wider than most reported electrolytes with conventional concentrations (1 m CaCl 2 , [ 45 ] NaCl, [ 42–44,51,52 ] MgCl 2 [ 53 ] etc.). Considering the reversibility and electrolytic decomposition of the device, the voltage range of 0–1.8 V was selected as the operating voltage range of the device (Figure S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 95%

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Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

You

Yuan

et al. 2022

Adv Funct Materials

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Traditional aqueous energy storage devices are difficult to operate at low temperatures owing to the poor ionic conductivity and sluggish interfacial dynamics in frozen electrolytes. Herein, the low-cost brine refrigerants for food freezing and preservation as electrolytes, and unexpectedly realize high ionic conductivity and stable operation of an aqueous storage device at low temperatures are demonstrated. A CaCl 2 brine refrigerant electrolyte (BRE) with a low freezing point −55 °C and high ionic conductivity (10.1 mS cm −1 at −50 °C) is developed for supercapacitors (SCs), which retains 80% of the room temperature capacity at −50 °C and exhibits ultra-long cycle life with excellent capacity retention of 92% over 98,500 cycles, outperforming the other SCs which can be operated below −40 °C in literature. Moreover, the SCs with MgCl 2 and NaCl BREs can also be operated successfully with excellent cycle stability and high-capacity retention at low temperatures of −30 and −20 °C, respectively. Fundamental correlation between various cations and their effect on the freezing point reduction of aqueous electrolytes is revealed via Raman investigation and molecular dynamics simulations. This study provides a rational design strategy for green, inexpensive, and safe low-temperature aqueous electrolytes for energy storage devices.

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Section: Physical Characteristics Of the Bressupporting

confidence: 88%

Section: Resultsmentioning

confidence: 95%

Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

You

Yuan

et al. 2022

Adv Funct Materials

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“…The supercapacitors show excellent gravimetric capacitance with electrodes of CVD grown helically coiled carbon nanotubes over carbon fiber. The CNT-based hybrid hydrogel demonstrates environmentally friendly electrode material with dissolving salt in water as an electrolyte for supercapacitor [ 138 ]. And the CNT aerogels provide high-rate capacitive performances [ 139 ].…”

Section: Emerging Opportunities For Carbon Nanotube Applicationsmentioning

confidence: 99%

Applications of Carbon Nanotubes in the Internet of Things Era

et al. 2021

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The post-Moore's era has boosted the progress in carbon nanotube-based transistors. Indeed, the 5G communication and cloud computing stimulate the research in applications of carbon nanotubes in electronic devices. In this perspective, we deliver the readers with the latest trends in carbon nanotube research, including high-frequency transistors, biomedical sensors and actuators, brain–machine interfaces, and flexible logic devices and energy storages. Future opportunities are given for calling on scientists and engineers into the emerging topics.

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“…stretchable supercapacitors. 4 The researchers used nitrogen-doped graphene flakes embedded in a hydrogel containing table salt (sodium chloride) as an electrolyte, avoiding the use of organic solvents. Single-wall carbon nanotubes served as current collectors and provided a stretchable matrix.…”

Section: Flexible Futurementioning

confidence: 99%

Super power

2020

Chemistry & Industry

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Superior environmentally friendly stretchable supercapacitor based on nitrogen-doped graphene/hydrogel and single-walled carbon nanotubes

Cited by 19 publications

References 41 publications

Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

Brine Refrigerants for Low‐cost, Safe Aqueous Supercapacitors with Ultra‐long Stable Operation at Low Temperatures

Applications of Carbon Nanotubes in the Internet of Things Era

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