Ultrathin Mesoporous RuCo<sub>2</sub>O<sub>4</sub>Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

Dubal, Deepak P.; Chodankar, Nilesh R.; Holze, Rudolf; Kim, Do‐Heyoung; Gómez‐Romero, Pedro

doi:10.1002/cssc.201700001

Cited by 77 publications

(47 citation statements)

References 72 publications

(126 reference statements)

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“…Details regarding the synthesis of MoS 2 @CF and MnO 2 @CF nanosheets are provided in the Supporting Information (section SI 1). The main motivation for preparing the MnO 2 @CF and MoS 2 @CF nanosheets with the hydrothermal method was to assemble high‐energy pseudocapacitive asymmetric SCs to overcome the limitations of carbon‐based asymmetric SCs …”

Section: Resultsmentioning

confidence: 99%

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

et al. 2019

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A porous nanostructure and high mass loading are crucial for a pseudocapacitor to achieve a good electrochemical performance. Although pseudocapacitive materials, such as MnO2 and MoS2, with record capacitances close to their theoretical values have been realized, the achieved capacitances are possible only when the electrode mass loading is less than 1 mg cm−2. Increasing the mass loading affects the capacitance as electron conduction and ion diffusion become sluggish. Achieving fast ion and electron transport at high mass loadings through all active sites remains a challenge for high‐mass‐loading electrodes. In this study, 2D MnO2 nanosheets supported on carbon fibers (MnO2@CF) as well as MoS2@CF with high mass loadings (6.6 and 7.2 mg cm−2, respectively) were used in a high‐energy pseudocapacitor. These hierarchical 2D nanosheets yielded outstanding areal capacitances of 1187 and 495 mF cm−2 at high current densities with excellent cycling stabilities. A pliable pseudocapacitive solid‐state asymmetric supercapacitor was designed using MnO2@CF and MoS2@CF as the positive and negative electrodes, respectively, with a high mass loading of 14.2 mg cm−2. The assembled solid‐state asymmetric cell had an energy density of 2.305 mWh cm−3 at a power density of 50 mW cm−3 and a capacitance retention of 92.25 % over 11 000 cycles and a very small diffusion resistance (1.72 Ω s−1/2). Thus, it is superior to most state‐of‐the‐art reported pseudocapacitors. The rationally designed nanostructured electrodes with high mass loading are likely to open up new opportunities for the development of a supercapacitor device capable of supplying higher energy and power.

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Section: Resultsmentioning

confidence: 99%

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

et al. 2019

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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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“…The electrochemical performance of the cell can also be evaluated by calculating the real and imaginary capacitances at corresponding frequencies [Eq. ]:

true C (ω) = C^{'} (ω) - j C^{^{''}} (ω)

true where C^{'} (ω) = \frac{Z^{^{''}} (ω)}{{ω | Z (ω) |}^{2}} and C^{^{''}} (ω) = \frac{Z^{'} (ω)}{{ω | Z (ω) |}^{2}}

…”

Section: Resultsmentioning

confidence: 99%

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

et al. 2017

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Nanofabrication using a "bottom-up" approach of hybrid electrode materials into a well-defined architecture is essential for next-generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalate (POM)-based hybrid electrode materials and their successful exploitation for asymmetric supercapacitors. First, redox active nanoclusters of POMs [phosphomolybdic acid (PMo ) and phosphotungstic acid (PW )] were uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO). The as-synthesized rGO-PMo and rGO-PW hybrid electrodes exhibited impressive electrochemical performances with specific capacitances of 299 (269 mF cm ) and 370 F g (369 mF cm ) in 1 m H SO as electrolyte at 5 mA cm . An asymmetric supercapacitor was then fabricated using rGO-PMo as the positive and rGO-PW as the negative electrode. This rGO-PMo ∥rGO-PW asymmetric cell could be successfully cycled in a wide voltage window up to 1.6 V and hence exhibited an excellent energy density of 39 Wh kg (1.3 mWh cm ) at a power density of 658 W kg (23 mW cm ).

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Ultrathin Mesoporous RuCo₂O₄Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

Cited by 77 publications

References 72 publications

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

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

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

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Ultrathin Mesoporous RuCo2O4Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors

Cited by 77 publications

References 72 publications

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

Two‐Dimensional Materials for High‐Energy Solid‐State Asymmetric Pseudocapacitors with High Mass Loadings

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

Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

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Ultrathin Mesoporous RuCo₂O₄Nanoflakes: An Advanced Electrode for High‐Performance Asymmetric Supercapacitors