Advantageous Al-ion intercalation in Mo15S19 nanosheets for aqueous symmetric supercapacitors

He, Yurong; Qiu, Guanyu; Qin, Ziyi; Zhang, Zhiqiang; Chen, Yunkai; Pan, Xuexue; Zha, Qing-Bing; Zha, Aiyun; Xu, Yongjun; Luo, Shixiong; Chen, Ming; Abbas, Qamar; Chen, Xinman

doi:10.1016/j.jpowsour.2022.231593

Cited by 4 publications

(1 citation statement)

References 64 publications

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“…[ 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: 94%

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: Resultsmentioning

confidence: 94%

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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Development of Flexible High‐Efficient Aluminum ion Supercapacitors With 2D Niobium MXene Electrode

Malyala,

Karingula,

Bhookya

et al. 2024

Energy Storage

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A high‐performance aluminum‐ion supercapacitor is fabricated using 2D few‐layered Nb2CTx MXene, as an active electrode material and Al2(SO4)3 electrolyte for efficient energy storage. Nb2CTx MXene has been synthesized from Nb2AlC MAX phase using HF. Nb2CTx MXene coated on carbon cloth (Nb@CC) displays a capacitance of 307 F g−1 with 90% coulombic efficiency. The specific capacitance of Nb@CC in Al2(SO4)3 electrolyte is exceptionally high compared to those (≤32.2 F g−1) in H2SO4, Na2SO4, and MgSO4 electrolytes. Both symmetric and asymmetric aluminum ion supercapacitors are fabricated with Nb@CC electrode. The Nb@CC//Nb@CC symmetric device exhibits a capacitance of 122 F g−1 with a high energy density (Ed) of 33.2 Wh kg−1 at 1.41 kW kg−1 power density (Pd). An asymmetric supercapacitor device (ASC), Nb@CC//CNT@CC, with carbon nanotube (CNT@CC) cathode delivers a maximum Ed of 24.7 Wh kg−1 at 3.41 kW kg−1 Pd and excellent stability with 90% capacitance retention after 4000 cycles. A remarkably high Pd of 34 kW kg−1 is maintained with 13.2 Wh kg−1 Ed, and the rate capability is 53% for a 10‐fold increase in current density. These results offer the feasibility of efficient aqueous supercapacitors with Al‐ion as guest species, presenting new possibilities for supercapacitors.

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High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors

Qiu

Zhang

Yambou

et al. 2023

Electrochimica Acta

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Advantageous Al-ion intercalation in Mo15S19 nanosheets for aqueous symmetric supercapacitors

Cited by 4 publications

References 64 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

Development of Flexible High‐Efficient Aluminum ion Supercapacitors With 2D Niobium MXene Electrode

High capacity Mo7S8 nanosheets with electrodeposited alpha-Co(OH)2 thin layer as positive electrode in hybrid potassium dual-ion supercapacitors

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