High Rate Capabilities of NiCo<sub>2</sub>O<sub>4</sub>-Based Hierarchical Superstructures for Rechargeable Charge Storage

Zhou, Qingwen; Wang, Xiaoyan; Yang, Lijun; He, Yongmei; Gao, Yanfang; Liu, Jinrong

doi:10.1149/2.0971412jes

Cited by 67 publications

(28 citation statements)

References 36 publications

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“…It should point out that CV curves consist of three strong redox peaks corresponding to the voltage plateaus revealed in GCD curves. The result indicates that the material displays a typical faradaic behavior consistent with a battery‐type electrode ,. As presented in Figure c, the specific capacities of CNTs@C@Cu 2‐x Se and Cu 2‐x Se nanosheets are calculated to be 371.4 and 234.3 C g −1 at the rate of 1 A g −1 , respectively.…”

Section: Resultsmentioning

confidence: 75%

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

et al. 2018

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In this work, one dimensional CNTs@C anchored with Cu2‐xSe nanospheres have been prepared by a facile solvothermal method. The parameters affected the morphology of the sample are investigated. When evaluated as anode for Li ion batteries, the obtained CNTs@C@Cu2‐xSe electrode delivers enhanced electrochemical performance with high reversible capacity, better cycle stability and rate capability. After 100th cycle, a discharge capacity of 399 mAh g−1 can be achieved at 0.1 A g−1. Even at high rate of 2 A g−1, the electrode can still keep a capacity of 198 mAh g−1 after 50 cycles. In addition, the obtained CNTs@C@Cu2‐xSe shows typical faradaic redox properties and exhibits excellent specific capacity (302.7 g−1 at 1 A g−1) and prominent cycling stability (86.9 % capacity retention after 2000 cycles at 2 A g−1). The enhanced electrochemical performance can be attributed to the unique structure. The Cu2‐xSe nanospheres consist of numerous nanocrystalline, which increases the contact area between Cu2‐xSe and electrolyte, reduces the pave length as well as accommodates volume change during cycling. The amorphous carbon layer with numerous carboxyl and hydroxyl groups strengthens the adhesion between the Cu2‐xSe and the CNTs. And the CNTs can enhance the conductivity of Cu2‐xSe and alleviate the mechanical stress and strain of the electrode during charge and discharge process.

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Section: Resultsmentioning

confidence: 75%

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

et al. 2018

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“…[32][33][34][35][36] With the increase of sweep rate from 2 to 50 mV s −1 , the current increases accordingly and the shape of the CV curves is well maintained, implying that the Ni 0.37 Co oxide electrode is favorable Adv. [32][33][34][35][36] With the increase of sweep rate from 2 to 50 mV s −1 , the current increases accordingly and the shape of the CV curves is well maintained, implying that the Ni 0.37 Co oxide electrode is favorable Adv.…”

Section: Resultsmentioning

confidence: 99%

Formation of Yolk‐Shelled Ni–Co Mixed Oxide Nanoprisms with Enhanced Electrochemical Performance for Hybrid Supercapacitors and Lithium Ion Batteries

Guan

Xiao

et al. 2015

Advanced Energy Materials

293

130

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Yolk‐shelled particles with tailored physical and chemical properties are attractive for electrochemical energy storage. Starting with metal acetate hydroxide with tetragonal prism‐like shapes, yolk‐shelled Ni–Co mixed oxide nanoprisms with tunable composition have been prepared by simple thermal annealing in air. It is found that the yolk‐shelled structure is formed due to the fast thermally driven contraction process. With the favorable porous structure and composition, these yolk‐shelled Ni–Co oxide particles manifest greatly enhanced electrochemical properties when evaluated as electrodes for both hybrid supercapacitors and lithium ion batteries. In particular, the resultant Ni0.37Co oxide sample delivers very high specific capacitance of over 1000 F g−1 at a current density of 10 A g−1 with remarkably high capacitance retention of 98% after 15 000 cycles.

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“…50 The specic capacity can be compared with a recent paper reporting hierarchical NiCo 2 O 4 with a similar evaluation method. 9 The 3D-ICHA a-Ni(OH) 2 shows a signicantly higher charge storage capacity than that of NiCo 2 O 4 as visualized in Fig. 8g.…”

Section: Charge Storage Performance Of As-obtained Lsh Assembliesmentioning

confidence: 91%

Cation–anion double hydrolysis derived layered single metal hydroxide superstructures for boosted supercapacitive energy storage

Wang

et al. 2015

J. Mater. Chem. A

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As promising battery-type electrode materials, layered single metal hydroxides (LSHs) including a-Ni(OH) 2 and a-Co(OH) 2 based hybrid supercapacitors exhibit larger operating voltages compared with those that are based on activated carbons and double-layer capacitance mechanisms. This study proposes a novel and facile room-temperature method to fabricate a-Ni(OH) 2 and a-Co(OH) 2 superstructures by using the double hydrolysis of Ni 2+ or Co 2+ and NCO À without the presence of any structure directing agent.Two dimensional sheet-like building blocks of the alpha-type metal hydroxide are assembled into various elegant morphologies including a 3D interconnected hierarchical assembly (3D-ICHA), sheet-onsheet, sheet-on-rod and other nanostructures, which depends on the cation-anion mixing mode.Significantly, the 3D-ICHA a-Ni(OH) 2 possesses an ultrahigh specific surface area (320.2 m 2 g À1 ) androbust porous structure. An outstanding initial specific capacity (653.1 C g À1 at 1 A g À1 and 406 C g À1 at 20 A g À1 ) and an excellent cycling retention (86.2% in 20 000 cycles) were obtained for the 3D-ICHA aNi(OH) 2 , which stands out from most of the state-of-the-art a-Ni(OH) 2 powder-based materials. A highloading asymmetric capacitor with excessive activated carbon ($10 mg 3D-ICHA a-Ni(OH) 2 vs. $60 mg activated carbon) is demonstrated and it works very steadily even after 20 000 charge/discharge cycles. IntroductionElectrochemical capacitors, also called supercapacitors, have attracted many scientic and practical investigations. They can complement or replace batteries in electrical energy storage and harvesting applications due to their high power density, fast charging/discharging rates, and long durability. 1-7 However, supercapacitors that are based on activated carbons and double-layer capacitance mechanisms (i.e., electrical doublelayer capacitors, EDLCs) have limited energy density with aqueous electrolytes because of lower operating voltages (rarely exceeding 1 V). 8 One promising strategy to circumvent such limitations is to design an asymmetric (or hybrid) system that combines an activated carbon negative electrode with a batterytype faradaic electrode (as the positive electrode), which can make use of the different potential windows of the two electrodes to increase the maximum operating voltage while offering the advantages of both supercapacitors (power density) and advanced batteries (energy density). 8,9 To enhance the supercapacitor performance, especially specic energy density while retaining intrinsic high specic power density, many researchers have focused on constructing nanoscale electrode materials because of the short transport paths for ions and electrons in faradaic redox reactions. 10 Among various battery-type faradaic electrode materials reported to date, two-dimensional materials have attracted an enormous amount of attention. 11 Layered single metal hydroxides (LSHs) including the a-hydroxide of nickel and cobalt with hydrotalcite structures have been reported to be promising battery...

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High Rate Capabilities of NiCo₂O₄-Based Hierarchical Superstructures for Rechargeable Charge Storage

Cited by 67 publications

References 36 publications

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

Formation of Yolk‐Shelled Ni–Co Mixed Oxide Nanoprisms with Enhanced Electrochemical Performance for Hybrid Supercapacitors and Lithium Ion Batteries

Cation–anion double hydrolysis derived layered single metal hydroxide superstructures for boosted supercapacitive energy storage

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High Rate Capabilities of NiCo2O4-Based Hierarchical Superstructures for Rechargeable Charge Storage

Cited by 67 publications

References 36 publications

CNTs@C@Cu2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

Formation of Yolk‐Shelled Ni–Co Mixed Oxide Nanoprisms with Enhanced Electrochemical Performance for Hybrid Supercapacitors and Lithium Ion Batteries

Cation–anion double hydrolysis derived layered single metal hydroxide superstructures for boosted supercapacitive energy storage

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High Rate Capabilities of NiCo₂O₄-Based Hierarchical Superstructures for Rechargeable Charge Storage

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors

CNTs@C@Cu_2‐xSe Hybrid Materials: An Advanced Electrode for High Performance Lithium Batteries and Supercapacitors