Construction of NiCo2O4@MnO2 nanosheet arrays for high-performance supercapacitor: Highly cross-linked porous heterostructure and worthy electrochemical double-layer capacitance contribution

Su, Li; Gao, Lijun; Du, Qinghua; Hou, Liyin; Ma, Zhipeng; Qin, Xiujuan; Shao, Guangjie

doi:10.1016/j.jallcom.2018.03.353

Cited by 55 publications

(20 citation statements)

References 59 publications

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“…are the potential Faradaic redox materials which can offer high capacitance/ capacity values, rich redox activity and higher electrochemical performance 15 . Recently, the binary and ternary composites of metal oxides have proved the remarkable electrochemical performance as compared to the individual materials resulting from the synergic effect among different components 21 , 22 . Among the several reported Faradaic redox materials, the ternary metal oxide composite of MnO 2 -NiCo 2 O 4 has proved its strong potential for high energy density supercapacitors 21 , 23 .…”

Section: Introductionmentioning

confidence: 99%

Textile-based supercapacitors for flexible and wearable electronic applications

Sundriyal

Bhattacharya

2020

Sci Rep

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Electronic textiles have garnered significant attention as smart technology for next-generation wearable electronic devices. The existing power sources lack compatibility with wearable devices due to their limited flexibility, high cost, and environment unfriendliness. In this work, we demonstrate bamboo fabric as a sustainable substrate for developing supercapacitor devices which can easily integrate to wearable electronics. The work demonstrates a replicable printing process wherein different metal oxide inks are directly printed over bamboo fabric substrates. The MnO 2-nico 2 o 4 is used as a positive electrode, rGO as a negative electrode, and LiCl/PVA gel as a solid-state electrolyte over the bamboo fabrics for the development of battery-supercapacitor hybrid device. The textile-based MnO 2-nico 2 o 4 //rGO asymmetric supercapacitor displays excellent electrochemical performance with an overall high areal capacitance of 2.12 F/cm 2 (1,766 F/g) at a current density of 2 mA/cm 2 , the excellent energy density of 37.8 mW/cm 3 , a maximum power density of 2,678.4 mW/ cm 3 and good cycle life. Notably, the supercapacitor maintains its electrochemical performance under different mechanical deformation conditions, demonstrating its excellent flexibility and high mechanical strength. The proposed strategy is beneficial for the development of sustainable electronic textiles for wearable electronic applications. Smart electronic textiles have recently gained a lot of attention as a viable solution for the upcoming wearable electronics era 1,2. The electronic textiles/ garments have demonstrated enormous potential in various applications such as; healthcare monitoring devices, environmental monitoring devices, military applications, entertainment, fashion technology etc 2-4. Recently, the development of different textile-based electronic devices (like; wearable displays, wearable sensors, memory devices, and wearable transistors) have received greater attention from the scientific and engineering community, and their development is carried out on a rapid pace 4-6. However, one of the major challenges for commercialization and further growth of wearable electronics is the lack of a compatible power supply that may possess the same level of flexibility, durability, weight, biocompatibility, and strength as the device itself 7,8. The conventional energy storage devices fail to address these needs due to their rigid and bulky nature and also their inability to mount/perform on moving surfaces as is a critical need of wearable devices mounted on human and other beings 1,9-11. Therefore, there exists a strong need for the development of flexible and high-performance energy storage devices which can be easily integrated with wearable electronics. Among the various energy storage devices, thin and flexible supercapacitors are gaining more consideration for wearable electronics due to their salient features, such as excellent lifetime, lightweight, high power density, and their ability to deliver under mechanical deformation co...

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Section: Introductionmentioning

confidence: 99%

Textile-based supercapacitors for flexible and wearable electronic applications

Sundriyal

Bhattacharya

2020

Sci Rep

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“…Additionally, transition metal oxides materials with high specific capacitance are widely used as cathode to be the construction of high‐performance all‐solid‐state asymmetric supercapacitors due to their rapid redox reaction at the electrode/solution interface . Among abundant transition metal oxide electrode materials for pseudocapacitors, manganese oxide (MnO 2 ) has been considered as one of the most promising materials owing to its advantages such as low price, natural abundance, and environmental compatibility . However, single‐phase MnO 2 electrode materials often suffer from poor rate capability and cycling stability because of its poor electronic/ionic transport.…”

Section: Introductionmentioning

confidence: 99%

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Jing

Fan

et al. 2019

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Based on the comparisons of current electrochemical energy storage systems (as shown in Table S1, Supporting Information), electrochemical supercapacitors have higher theoretical specific capacity due to the redox reaction at the interface of electrode material compared with traditional electrostatic capacitors, meanwhile it still can maintain high power density. Therefore, electrochemical supercapacitors (ECs) as alternative energy devices have the ability to bridge the energy-power gap between traditional electrostatic capacitors and Li-ion batteries, and attracted much attention in recent years due to their large current charge/discharge capability, high power density and outstanding cycle stability. [5,6] These merits are essential to accessory power sources, for instance, portable electronic devices, new energy vehicles, emergency power supply and military field and so on. Importantly, the new generation of energy storage devices not only need high power and light weight, but also need high energy density, environmental protection and sustainable development. [7,8] Up to now, although the commercial Li-ion batteries exhibit high energy density (e.g., LiFePO 4 , LNCMO), their cycle and power characteristics are not as good as those of supercapacitors (Table S2, Supporting Information). However, supercapacitors are not able to store the same amount of charge as Li-ion batteries do, which is usually 3-30 times lower. Thus, a major obstacle is how to increase the energy density of supercapacitors without sacrificing power density and cyclability. On the basis of the equation of energy density E = 1/2 CV 2 , the energy density (E) can be improved by increasing voltage window (V) or specific capacitance (C). The working voltage has proven to be mainly dependent on the electrolyte stability. [9][10][11][12] Although organic electrolytes have enhanced the operating voltage of supercapacitors, the high cost and toxicity limit their practical application. Nevertheless, water-based electrolytes pull down the energy density of supercapacitors because of the lower decomposition voltage of water (≈1.2 V). [13,14] In contrast, the all-solid-state asymmetric supercapacitors can extend working voltage windows through restraining the oxygen evolution A stable MnO x @C@MnO x core-shell heterostructure consisting of vertical MnO x nanosheets grown evenly on the surface of the MnO x @carbon nanowires are obtained by simple liquid phase method combined with thermal treatment. The hierarchical MnO x @C@MnO x heterostructure electrode possesses a high specific capacitance of 350 F g −1 and an excellent cycle performance owing to the existence of the pore structure among the ultrasmall MnO x nanoparticles and the rapid transmission of electrons between the active material and carbon coating layer. Particularly, according to the in situ Raman spectra analysis, no characteristic peaks corresponding to MnOOH are found during charging/discharging, indicating that pseudocapacitive behavior of the MnO x electrode have no relevance to the ...

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“…The increase of capacity in first 1000 cycles for pristine NiCo 2 O 4 electrode can be attributed to the electrochemical activation of active materials . To further evaluate the influence of the phosphating treatment (amount of NaH 2 PO 2 ·H 2 O) on the electrochemical properties of the NiCo 2 O 4 electrode, we compare the capacities of the pristine NiCo 2 O 4 and P–NiCo 2 O 4‐ x ‐X (“X” represents the amount of NaH 2 PO 2 ·H 2 O) electrodes at various current densities (Figure f, Figure S10, Supporting Information). Evidently, all of the P–NiCo 2 O 4‐ x ‐X electrodes exhibited a higher capacity than the pristine NiCo 2 O 4 electrode, revealing that oxygen vacancies and phosphate ion functionalization exert a profound effect on the charge–discharge properties of NiCo 2 O 4 ‐based electrodes.…”

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confidence: 99%

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

et al. 2018

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The development of high-capacity, Earth-abundant, and stable cathode materials for robust aqueous Zn-ion batteries is an ongoing challenge. Herein, ultrathin nickel cobaltite (NiCo O ) nanosheets with enriched oxygen vacancies and surface phosphate ions (P-NiCo O ) are reported as a new high-energy-density cathode material for rechargeable Zn-ion batteries. The oxygen-vacancy and surface phosphate-ion modulation are achieved by annealing the pristine NiCo O nanosheets using a simple phosphating process. Benefiting from the merits of substantially improved electrical conductivity and increased concentration of active sites, the optimized P-NiCo O nanosheet electrode delivers remarkable capacity (309.2 mAh g at 6.0 A g ) and extraordinary rate performance (64% capacity retention at 60.4 A g ). Moreover, based on the P-NiCo O cathode, our fabricated P-NiCo O //Zn battery presents an impressive specific capacity of 361.3 mAh g at the high current density of 3.0 A g in an alkaline electrolyte. Furthermore, extremely high energy density (616.5 Wh kg ) and power density (30.2 kW kg ) are also achieved, which outperforms most of the previously reported aqueous Zn-ion batteries. This ultrafast and high-energy aqueous Zn-ion battery is promising for widespread application to electric vehicles and intelligent devices.

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Construction of NiCo2O4@MnO2 nanosheet arrays for high-performance supercapacitor: Highly cross-linked porous heterostructure and worthy electrochemical double-layer capacitance contribution

Cited by 55 publications

References 59 publications

Textile-based supercapacitors for flexible and wearable electronic applications

Textile-based supercapacitors for flexible and wearable electronic applications

High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

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Construction of NiCo2O4@MnO2 nanosheet arrays for high-performance supercapacitor: Highly cross-linked porous heterostructure and worthy electrochemical double-layer capacitance contribution

Cited by 55 publications

References 59 publications

Textile-based supercapacitors for flexible and wearable electronic applications

Textile-based supercapacitors for flexible and wearable electronic applications

High‐Stability MnOxNanowires@C@MnOxNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism

Oxygen‐Vacancy and Surface Modulation of Ultrathin Nickel Cobaltite Nanosheets as a High‐Energy Cathode for Advanced Zn‐Ion Batteries

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High‐Stability MnO_xNanowires@C@MnO_xNanosheet Core–Shell Heterostructure Pseudocapacitance Electrode Based on Reversible Phase Transition Mechanism