A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Peng, Hui; Ma, Guofu; Sun, Kanjun; Zhang, Zhiguo; Li, Jindan; Zhou, Xiaozhong; Lei, Ziqiang

doi:10.1016/j.jpowsour.2015.08.025

Cited by 180 publications

(59 citation statements)

References 37 publications

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“…The symmetric SC shows a maximum specific energy of 30.69 Wh kg −1 , which decreases to 15.45 Wh kg −1 as the specific power increases from 200 to 3200 W kg −1 . As seen in the Ragone plot, the obtained value of specific energy is higher than that for some recently reported symmetric and asymmetric SCs . Previously, we reported the RuCo 2 O 4 based asymmetric SCs, where we obtained the highest specific energy of 32.6 Wh kg −1 at 0.6 A g −1 current density .…”

Section: Resultscontrasting

confidence: 45%

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Chodankar

Dubal

et al. 2018

Adv Materials Inter

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Consequently, many different materials, including carbon, [2] metal oxides, [3] metal sulfides, [4] and conducting polymers, [5] have been assessed for SC applications in order to achieve electrodes with the desired electrochemical properties. Particularly, the redox chemistry of an electrode material strongly affects its electrochemical properties. Considering the importance of redox chemistry in SCs, electrode materials based on redox-rich mixed-transition-metal oxides such as MCo 2 O 4 , MFe 2 O 4 , and MMn 2 O 4 (where M is a metal cation) have been extensively tested in SCs owing to their multiple oxidation states and superior electrical conductivities, specific capacitances, and electrochemical stabilities as compared to those their parent unitary metal oxides. [6] Consequently, several mixed-transitionmetal oxides with different compositions, such as NiCo 2 O 4 , FeCo 2 O 4 , CoFe 2 O 4 , and NiMn 2 O 4 , have already been assessed for application as SC materials. [7][8][9][10] However, among these possible compositions, NiCo 2 O 4 has been the most studied. [11] Cationic substitution of the Co content in MCo 2 O 4 -based electrodes by any new metal cation having a different oxidation state will effectively improve its electrochemical performance. Therefore, it is necessary to test some advanced Co-replacing metal cations. In that respect, RuCo 2 O 4 provides better electrochemical results as both the metal cations have different oxidation states and high electrical conductivity. [12] The problem with the production of Ru/Co-based materials is the high cost of the raw materials. Consequently, researchers are constantly trying to find cheaper alternatives to Ru/Co-based materials. However, there is no doubt that Ru/Co-based metal oxides exhibit superior supercapacitive properties in terms of electrical conductivity, specific capacitance, and cycling stability. More importantly, the different oxidations states of the Ru and Co metal cations improve energy storing capacity, while the higher electrical conductivity supports fast charge-transfer processes. Thus, the aim of the present work was to combine Ru and Co metal cations in a single electrode to take full advantage of both metal cations.In this work, novel thin films composed of RuCo 2 O 4 nanobelts have been grown on low-cost stainless steel mesh The superfast (≈30 min) and template-free electrochemical approach is developed to prepare the unique nanobelts-architectured RuCo 2 O 4 thin films over the stainless steel mesh substrates. The vertically aligned and interconnected RuCo 2 O 4 nanobelts present sufficient interspace to provide more electroactive sites and shorten the diffusion path for electrolyte ions. Owing to their unique nanostructure and higher electrical conductivity, the RuCo 2 O 4 nanobelts exhibit excellent electrochemical features, including a specific capacitance of 1447 F g −1 , and excellent electrochemical stability (82.25% retention over 16 000 cycles). Additional electrochemical kinetic analysis is carried out to confirm whet...

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Section: Resultscontrasting

confidence: 45%

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Chodankar

Dubal

et al. 2018

Adv Materials Inter

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“…d) Specific capacitances of the MoSe 2 //V‐MnO 2 ASC at various current densities. e) Ragone plots of the MoSe 2 //V‐MnO 2 ASC device and previously reported metal selenide‐based ASC devices . f) Cyclic performance of the MoSe 2 //V‐MnO 2 ASC device.…”

Section: Resultsmentioning

confidence: 97%

Mass Production of High‐Quality Transition Metal Dichalcogenides Nanosheets via a Molten Salt Method

Jin

et al. 2019

Adv Funct Materials

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2D transition metal dichalcogenides (TMDs) are well suited for energy storage and field-effect transistors because of their thickness-dependent chemical and physical properties. However, as current synthetic methods for 2D TMDs cannot integrate both advantages of liquid-phase syntheses (i.e., massive production and homogeneity) and chemical vapor deposition (i.e., high quality and large lateral size), it still remains a great challenge for mass production of high-quality 2D TMDs. Here, a molten salt method to massively synthesize various high-crystalline TMDs nanosheets (MoS 2 , WS 2 , MoSe 2 , and WSe 2 ) with the thicknesses less than 5 nm is reported, with the production yield over 68% with the reaction time of only several minutes. Additionally, the thickness and size of the as-synthesized nanosheets can be readily controlled through adjusting reaction time and temperature. The assynthesized MoSe 2 nanosheets exhibit good electrochemical performance as pseudocapacitive materials. It is further anticipates that this work will provide a promising strategy for rapid mass production of high-quality nonoxides nanosheets for energy-related applications and beyond.

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“…Therefore, the SCM k LRGONR cell shows superior characteristics among other cobalt-based hybrid cells (Table S1). [42][43][44][45][46][47][48] Nearly the same charge-discharge time of the cell demonstrates its good columbic efficiency and high reversibility (FigureS14). The electrochemical impedance spectroscopy (EIS) spectra of the hybrid cell remaina lmost the same after 10 000 cycles ( Figure S15), suggesting good electrochemicals tability of the material.…”

Section: Resultsmentioning

confidence: 99%

Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

2018

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Enriched with oxygen vacancies, Mo-doped strontium cobaltite (SrCo Mo O , SCM) is synthesized as an oxygen anion-intercalated charge-storage material through the sol-gel method. The supplemented oxygen vacancies, good electrical conductivity, and high ion diffusion coefficient bestow the SCM electrode with excellent specific capacitance (1223.34 F g ) and specific capacity (168.88 mAh g ) at 1 A g . The decisive constant (b-value) deduced for the charge storage mechanism (low scan-rate region) is nearly 0.8, indicating a highly capacitive process. In the high scan-rate region, however, the b-value is almost 0.5, and a linear pattern of charge (q) versus the inverse of the square root of the scan rate (v ) is obtained. The results reveal O diffusion as the rate-limiting factor for charge storage. Furthermore, a hybrid cell (SCM∥LRGONR) is fabricated by using lacey, reduced graphene oxide nanoribbon (LRGONR) as the negative electrode, which exhibits a high energy density (74.8 Wh kg at a power density of 734.5 W kg ). With a charging time of only 20.7 s, the cell sustains a very high energy density (33 Wh kg ) with a high power delivery rate (6600 W kg ). The excellent cycling stability (165.1 % activated specific capacitance retention and 97.6 % of the maximum value attained) after 10 000 charge-discharge cycles, demonstrates SCM is a potential electrode material for supercapacitors.

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A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Cited by 180 publications

References 37 publications

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Mass Production of High‐Quality Transition Metal Dichalcogenides Nanosheets via a Molten Salt Method

Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

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A novel aqueous asymmetric supercapacitor based on petal-like cobalt selenide nanosheets and nitrogen-doped porous carbon networks electrodes

Cited by 180 publications

References 37 publications

Superfast Electrodeposition of Newly Developed RuCo2O4 Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo2O4 Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Mass Production of High‐Quality Transition Metal Dichalcogenides Nanosheets via a Molten Salt Method

Fabrication of a Mo‐Doped Strontium Cobaltite Perovskite Hybrid Supercapacitor Cell with High Energy Density and Excellent Cycling Life

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Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor

Superfast Electrodeposition of Newly Developed RuCo₂O₄ Nanobelts over Low‐Cost Stainless Steel Mesh for High‐Performance Aqueous Supercapacitor