Spinel-type solar-thermal conversion coatings on supercapacitors: An effective strategy for capacitance recovery at low temperatures

Ma, Peipei; Sun, Yinglun; Zhang, Xu; Chen, Jiangtao; Yang, Bingjun; Zhang, Qingnuan; Gao, Xiang‐Hu; Yan, Xingbin

doi:10.1016/j.ensm.2019.05.016

Cited by 31 publications

(21 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[7][8][9][10] In addition, FSCs devices assembled from MXene-based fiber electrodes show generally high device performance at room temperature, while the device performance will be severely degraded in harsh environments, especially in severe cold or hot conditions. [11][12][13] Therefore, it is an urgent need to develop full-temperature FSCs devices assembled from MXene-based fiber electrodes in a wide temperature range, [14,15] and there is no report on the full-temperature FSCs assembled from MXene-based fiber electrodes up to now. [16,17] In the present work, in order to achieve the optimal balance of the capacitive performance and flexibility for MXene-based fiber electrodes, aramid nanofibers (ANF) were used as a functional additive obtained by proton donor-assisted deprotonation of PPTA fibers and the delaminated Ti 3 C 2 T x NSs as assembled units, Ti 3 C 2 T x /ANF (T/A) hybrid fibers with high capacitive performance and excellent flexibility were prepared by a wet spinning method in a coagulated bath of 0.5 m FeCl 2 solution.…”

Section: Introductionmentioning

confidence: 99%

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Liu

Zhao

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

Full-temperature all-solid-state flexible symmetrical fiber supercapacitors (FSCs) are assembled by using montmorillonite flake/polyvinyl alcohol organic hydrogel (F-MMT/PVA OHGE) as the electrolyte and separator and Ti 3 C 2 T x /ANF-5% (T/A-5) fiber as the electrode, in which T/A-5 fiber is prepared by using delaminated Ti 3 C 2 T x nanosheets as assembled units and 5% of aramid nanofiber (ANF) as the functional additive using a wet spinning method in a coagulated bath with 0.5 m FeCl 2 solution. The T/A-5 hybrid fiber exhibits a specific capacity of 807 F cm −3 in 3 m H 2 SO 4 electrolyte, a superior mechanical strength of 104 MPa, and a high conductivity of 1025 S cm −1 . The assembled F-MMT/PVA OHGE T/A-5 FSC not only shows a specific capacitance of 295 F cm −3 and a capacitance retention of 91% at a current density of 5 A cm −3 after 10 000 charging/discharging cycles, but also a maximum volumetric energy density of 26.2 mWh cm −3 . Meanwhile, the assembled device displays good flexibility and excellent capacitance in a wide temperature range of −40 to 80 °C, the electrochemical performance of the FSC is maintained under varying degrees of bending. This study provides an effective strategy for designing and assembling of full-temperature all-solid-state symmetrical flexible FSCs with the optimal balance of capacitive performance and flexibility.

show abstract

Section: Introductionmentioning

confidence: 99%

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Liu

Zhao

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…Solar energy, as a green, renewable, and widely available energy source, plays an important role in achieving a sustainable society. In the past decades, various solar energy-harvesting technologies, such as solar cells, solar water-splitting cells, and solar charging supercapacitors, have attracted intensive attention (Yao et al, 2018;Jiang et al, 2017;Shi et al, 2016;Sun and Yan, 2017;Yi et al, 2018;Sun et al, 2018;Ma et al, 2019). Among them, semiconductor/liquid junctions are core structures in these devices.…”

Section: Introductionmentioning

confidence: 99%

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

et al. 2020

View full text Add to dashboard Cite

Semiconductor/Faradaic layer/liquid junctions have been widely used in solar energy conversion and storage devices. However, the charge transfer mechanism of these junctions is still unclear, which leads to inconsistent results and low performance of these devices in previous studies. Herein, by using Fe 2 O 3 and Ni(OH) 2 as models, we precisely control the interface structure between the semiconductor and the Faradaic layer and investigate the charge transfer mechanism in the semiconductor/ Faradaic layer/liquid junction. The results suggest that the short circuit severely restricts the performance of the junction for both solar water splitting cells and solar charging supercapacitors. More importantly, we also find that the charge-discharge potential window of a Faradaic material sensitively depends on the energy band positions of a semiconductor, which provides a new way to adjust the potential window of a Faradaic material. These new insights offer guidance to design high-performance devices for solar energy conversion and storage.

show abstract

“…As for the organic electrolytes, the influence of water electrolysis is exclusive, and the electrolyte operating voltage range only depends on its electrochemical stability voltage. [10][11][12] Following these two approaches, the potential windows can be effectively expanded, which is the basic requirement for supercapacitors to deliver a high output voltage.Another neglected property of supercapacitors is their self-discharge rate, the low capacity retention in open circuit state makes the supercapacitors less effective in practical applications. A general method was required to enhance the anti-self-discharge properties.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Huang

Chen

et al. 2020

Advanced Energy Materials

163

123

View full text Add to dashboard Cite

It is generally believed that supercapacitors are mainly characterized by high power density and low energy density; therefore, significant efforts have been focused on improving the energy density of electrode materials. [2,3] The potential windows of aqueous supercapacitors, especially for those based on acidic and alkaline electrolytes, are limited by their electrolyte decomposition voltage (1.23 V). Several researchers showed potentials reaching only ≈1 V, which heavily impeded the practical application of supercapacitors. [4][5][6] Two methods that have proven effective in resolving the narrow voltage range that results from water decomposition entail replacing the water electrolyte with "water in salt" (WiS) electrolytes and organic electrolytes, respectively. [7,8] The WiS electrolytes were proposed by Wang and co-workers in 2015, and their use expanded the potential window to ≈3.0 V due to the formation of an electrode-electrolyte interphase. [9] The close interaction between water molecules and the electrolyte in ultrahigh concentration makes it difficult for water to decompose, thus effectively broadening the electrochemical operating voltage range. As for the organic electrolytes, the influence of water electrolysis is exclusive, and the electrolyte operating voltage range only depends on its electrochemical stability voltage. [10][11][12] Following these two approaches, the potential windows can be effectively expanded, which is the basic requirement for supercapacitors to deliver a high output voltage.Another neglected property of supercapacitors is their self-discharge rate, the low capacity retention in open circuit state makes the supercapacitors less effective in practical applications. A general method was required to enhance the anti-self-discharge properties. The intrinsic reason for the fastself-discharge speed is that when both anode and cathode materials store electricity through adsorption behaviors, they have a barely satisfactory ion limiting ability and the ions adsorbed on the electrode during the charging process will soon diffuse into the electrolyte due to the concentration gradient. Hybrid ion capacitors can be constructed to inhibit self-discharge by incorporating insertion-type and conversion-type batterytype electrodes that have stronger force for limiting ions than through simple adsorption behaviors. For this, one of the Output voltage and self-discharge rate are two important performance indices for supercapacitors, which have long been overlooked, though these play a very significant role in their practical application. Here, a zinc anode is used to construct a zinc ion hybrid capacitor. Expanded operating voltage of the hybrid capacitor is obtained with novel electrolytes. In addition, significantly improved anti-self-discharge ability is achieved. The phosphorene-based zinc ion capacitor exploiting a "water in salt" electrolyte with a working potential can reach 2.2 V, delivering 214.3 F g −1 after 5000 cycles. The operating voltage is further extended to 2.5 V through the...

show abstract

Spinel-type solar-thermal conversion coatings on supercapacitors: An effective strategy for capacitance recovery at low temperatures

Cited by 31 publications

References 66 publications

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Contact Info

Product

Resources

About

Spinel-type solar-thermal conversion coatings on supercapacitors: An effective strategy for capacitance recovery at low temperatures

Cited by 31 publications

References 66 publications

Full‐Temperature All‐Solid‐State Ti3C2Tx/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Full‐Temperature All‐Solid‐State Ti3C2Tx/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Reversible Charge Transfer and Adjustable Potential Window in Semiconductor/Faradaic Layer/Liquid Junctions

Phosphorene as Cathode Material for High‐Voltage, Anti‐Self‐Discharge Zinc Ion Hybrid Capacitors

Contact Info

Product

Resources

About

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility

Full‐Temperature All‐Solid‐State Ti₃C₂T_x/Aramid Fiber Supercapacitor with Optimal Balance of Capacitive Performance and Flexibility