Hierarchical nanocarbon-MnO2 electrodes for enhanced electrochemical capacitor performance

Qi, Hongsheng; Bo, Zheng; Yang, Shiling; Duan, Liangping; Yang, Huachao; Yan, Jun; Cen, Kefa; Ostrikov, Kostya Ken

doi:10.1016/j.ensm.2018.07.019

Cited by 41 publications

(19 citation statements)

References 93 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the temperature decreases from 60 to −30 °C, the energy density attenuates to 21.6 Wh kg −1 at a power density of 804.3 W kg −1 . The values are comparable to those of the state‐of‐the‐art MnO 2 ‐based asymmetric supercapacitors, implying high energy storage performance over a wide temperature range …”

Section: Resultssupporting

confidence: 59%

“…[28] The fitted data of Warburg resistance at each temperature is less than 1 Ω, indicating a fast ion diffusion inside the electrode. [51,52] Moreover, the charge transfer resistance of the GN/VGNS/MnO 2 electrode at RT is smaller than those of MnO 2 -based materials, [46,[53][54][55][56] Co 3 O 4 , [24] and Fe 3 O 4 /carbon composite [23] (in the range of 1.9 to 10.7 Ω), which confirms the rapid charge transfer kinetics in the interfacial Faradaic reactions. The synergistic contributions from the hierarchical structure of GN/VGNS/MnO 2 could account for the relatively low resistances, as schematically illustrated in Figure 1a.…”

Section: Temperature Stability Of the Gn/vgns/mno 2 Pseudocapacitormentioning

confidence: 71%

“…The values are comparable to those of the state-of-the-art MnO 2 -based asymmetric supercapacitors, implying high energy storage performance over a wide temperature range. [54,56,[60][61][62][63][64] To demonstrate the practical application, a supercapacitor group consisting of three as-prepared asymmetric supercapaci- tors connected in series was used to light 8 red LEDs with a turn-on voltage of 1.8 V (see Figure S11). The operating temperature of the supercapacitor group was set to be À 30, 25 and 60°C.…”

Section: Applications Of Asymmetric Supercapacitor In a Wide Temperatmentioning

confidence: 99%

See 2 more Smart Citations

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Kong

Xiong

et al. 2019

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

The relatively poor performance stability of pseudocapacitors over a wide temperature window (i. e. temperature stability), particularly at low temperatures, hinders their practical applications. Here, well‐aligned hierarchical pseudocapacitive electrodes are fabricated, featuring run‐through channels in a graphene network (GN) as ion‐buffering reservoirs, open inter‐sheet channels between vertical graphene nanosheets (VGNSs) for fast ion transport and MnO2 nanopetals on VGNSs for efficient interfacial pseudocapacitive reactions. With reduced ion diffusion length and charge‐transfer resistance as well as improved ion‐transport rate, the capacitance of pseudocapacitive electrodes decreases from 541 to 490 F g−1 at 1 A g−1 as the temperature drops from 25 to 0 °C, revealing a high capacitance retention of 90.7 %. Furthermore, the specific capacitance of a symmetric device based on the hierarchical electrodes at −30 °C maintains 80.8 % of the room‐temperature capacitance. Such outstanding temperature stability is comparable to the state‐of‐the‐art electric double‐layer capacitors. Importantly, 86.0 % of capacitance is retained after repeated heating and cooling at temperatures ranging from −30 to 60 °C for 5000 cycles. Asymmetric supercapacitors with the hierarchical architecture in the positive electrode exhibit stable performance over a wide temperature range. These results demonstrate the rationality of the electrode design for practical energy storage applications in harsh temperature environments.

show abstract

Section: Resultssupporting

confidence: 59%

Section: Temperature Stability Of the Gn/vgns/mno 2 Pseudocapacitormentioning

confidence: 71%

Section: Applications Of Asymmetric Supercapacitor In a Wide Temperatmentioning

confidence: 99%

See 1 more Smart Citation

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Kong

Xiong

et al. 2019

ChemElectroChem

Self Cite

View full text Add to dashboard Cite

show abstract

“…The slope of the oblique line at low frequency for CoNi LDH/MnO X /CFP is steeper than MnO X /CFP, demonstrating that CoNi LDH/MnO X /CFP has a lower diffusion resistance, corresponding to a high specific capacitance and rate capability performance. Compared with the similar reported literature in Table , the electrochemical performance of MnO X material significantly improved in our work . The excellent pseudocapacitive behavior of CoNi LDH/MnO X /CFP can be attributed to the following aspects: 1) as an excellent current collector, CFP has good permeability, high conductivity, and strong adsorption; 2) the CoNi LDH substrate can not only act as a template to direct growth of as‐deposited manganese oxide, but also affects the conductivity of the electrodes and ﬁnally the electrochemical properties of the whole system; and 3) the spherical morphology of CoNi LDH/MnO X with a suitable aperture structure exhibits high capacitive properties.…”

Section: Resultssupporting

confidence: 51%

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnO_X Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

et al. 2019

View full text Add to dashboard Cite

A carbon fiber paper (CFP)‐supported CoNi layered double hydroxide (LDH)/MnOX or MnOX nanomaterial is prepared by a simple and effective two‐step electrochemical deposition process. The binder‐free CoNi LDH/MnOX/CFP exhibits enhanced electrochemical properties than that of MnOX/CFP, with a maximum capacitance of 1460 F g−1 at 1 A g−1, and an excellent capacitance retention of 87% at 4 A g−1. Notably, the CoNi LDH/MnOX composite exhibits a remarkable cycling stability with 82% capacitance retention over 20 000 cycles even at a high current density of 32 A g−1. The outstanding electrochemical performance of the CoNi LDH/MnOX/CFP can contribute to the synergistic effects of the freestanding electrode with improved electrical conductivity, electrochemical activity, and material utilization than pure MnOX. Furthermore, an asymmetric supercapacitor (ASC) fabricated with a CoNi LDH/MnOX/CFP positive electrode and active carbon (AC)/CFP negative electrode displays a high energy density of 28.1 Wh kg−1 at a power density of 400 W kg−1. These encouraging results indicate that the low‐cost CoNi LDH/MnOX/CFP composite shows great potential for high‐performance energy storage applications.

show abstract

“…According to the XRD results of Figure (a), the f‐AC sample exhibits one characteristic broad diffraction peak at 2 θ =23.3° corresponding to the (002) reflection arising from the crystal plane of graphite and a lower intensity peak at 2 θ =43.7° which can be used to infer a high degree of interlayer condensation of carbon planes. The diffraction pattern of the MnO 2 /f‐AC exhibits diffraction peaks at 2 θ of 14.53, 18.51, 28.61, 36.32, 41.51 and 58.12° corresponding to reflections from (110), (200), (310), (211), (301) and (600) planes, of the thermodynamically stable α‐MnO 2 phase (JCPDS card PDF file no.44‐0141) . The characteristic peak at 2 θ =23.3° is attributed to the (002) crystal plane of graphite of the f‐AC.…”

Section: Resultsmentioning

confidence: 99%

Activated Carbon Derived from Phoenix dactylifera (Palm Tree) and Decorated with MnO₂ Nanoparticles for Enhanced Hybrid Capacitive Deionization Electrodes

et al. 2020

View full text Add to dashboard Cite

In this study, the electro‐sorption capacity and selectivity of activated carbon (AC) electrodes, produced from the leaf base of Phoenix dactylifera (palm tree) waste, are modified by enabling the reversible intercalation/conversion of sodium ions through the presence of nanoscale α‐MnO2 particles acting as redox mediators. The α‐MnO2 nanoparticles (NPs) are hydrothermally grown on the AC powder to obtain a functional composite material (α‐MnO2/f‐AC). The morphological, textural, and physicochemical surface properties of the pristine and modified AC materials are thoroughly examined and correlated with the electrochemical performance of the resulting electrodes that are implemented in an asymmetric capacitive deionization (CDI) cell configuration (i. e. capacitive vs Faradaic electrodes). The pristine biowaste‐derived AC presents a high specific surface area of 1224 m2 g−1, and high electrical capacitance of 259 F g−1 at 10 mV s−1. The α‐MnO2 surface modification approach of the pristine material retains its large accessible surface area, and additionally enables a 50% increase in its specific capacitance value. The incorporation of the α‐MnO2/f‐AC material in the anode and the pristine source in the cathode produces superior electrosorption capacity, as high as 17.8mgg−1 in batch‐mode CDI tests with 600mg L−1 NaCl feed. The enhanced electrical performance and pseudocapacitive behavior of the CDI cell can be explained by the α‐MnO2 nanoparticles playing a critical role in enabling a synergistic redox‐based charge‐discharge pathway under conditions compatible with the voltage operation requirements of the CDI process.

show abstract

Hierarchical nanocarbon-MnO2 electrodes for enhanced electrochemical capacitor performance

Cited by 41 publications

References 93 publications

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnO_X Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

Activated Carbon Derived from Phoenix dactylifera (Palm Tree) and Decorated with MnO₂ Nanoparticles for Enhanced Hybrid Capacitive Deionization Electrodes

Contact Info

Product

Resources

About

Hierarchical nanocarbon-MnO2 electrodes for enhanced electrochemical capacitor performance

Cited by 41 publications

References 93 publications

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Well‐Aligned Hierarchical Graphene‐Based Electrodes for Pseudocapacitors with Outstanding Low‐Temperature Stability

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnOX Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

Activated Carbon Derived from Phoenix dactylifera (Palm Tree) and Decorated with MnO2 Nanoparticles for Enhanced Hybrid Capacitive Deionization Electrodes

Contact Info

Product

Resources

About

Electrochemical Deposition Enables Freestanding CoNi Layered Double Hydroxide/MnO_X Electrode with Enhanced Electrochemical Properties for Asymmetric Supercapacitors

Activated Carbon Derived from Phoenix dactylifera (Palm Tree) and Decorated with MnO₂ Nanoparticles for Enhanced Hybrid Capacitive Deionization Electrodes