A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

Mu, Xuemei; Zhang, Yaxiong; Wang, Huan; Huang, Baoyu; Sun, Pengbo; Chen, Tao; Zhou, Jinyuan; Xie, Erqing; Zhang, Zhenxing

doi:10.1016/j.electacta.2016.06.072

Cited by 69 publications

(20 citation statements)

References 51 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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“…The asymmetric supercapacitor in this work can work steadily at potential window of 1.5 V, and can deliver an ultrahigh density of 86.3 Wh kg À1 at a power density of 379.1 W kg À1 based on the total mass of the active materials. Even at a high power density of 7,490 W kg À1 , the energy density can still be maintained at 65.4 Wh kg À1 , which is superior to those of previous reported devices in the literatures [47][48][49][50][51][52][53] (Table S1 online). Furthermore, two identical asymmetric supercapacitors were connected in series and charged to 3 V. After that, they can easily light up three color-changing LEDs (Fig.…”

Section: Resultsmentioning

confidence: 67%

One-pot synthesis of nickel-cobalt hydroxyfluorides nanowires with ultrahigh energy density for an asymmetric supercapacitor

et al. 2018

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“…Molybdates have the general formula MMoO 4 (M = Ni, Zn, Co, Mn) which have shown applications including electrochemical energy storage . Molybdates such as NiMoO 4 , CoMoO 4 , MnMoO 4 , and ZnMoO 4 (Table ) have demonstrated very good electrochemical behavior for supercapacitors . Molybdates having various oxidation states from 0 to +6 are rendered with high theoretical specific capacitance; however these suffer from poor electronic conductivity, cyclic stability, and severe particle aggregation .…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Graphene/Binary Metal Molybdate (Graphene/Zn_1−xNi_xMoO₄) Nanocomposite for Supercapacitors

Reddy

Vickraman

Justin

2018

Physica Status Solidi (a)

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A novel graphene/binary metal molybdate (Zn 1-x Ni x MoO 4 ) is synthesized via a facile and simple microwave synthesis route (x ¼ 0.0, 0.2, 0.4, 0.6, 0.8). Electrochemical studies are performed for all the samples to study their charge storage mechanism and frequency dependence in a three-electrode set up with 2M KOH electrolyte solution. Among the samples, Zn 0.6 Ni 0.4-MoO 4 shows better electrochemical performance which is combined with graphene so as to obtain graphene/Zn 1-x Ni x MoO 4 (x ¼ 0.4) nanocomposite. XRD and Raman analyses have confirmed formation of complexation of graphene/binary metal molybdate nanocomposite. TEM morphological profile illustrates little aggregation and interconnected layers of graphene interspersed with rice-like grains of binary metal molybdate. Graphene/Zn 1-x Ni x MoO 4 (x ¼ 0.4) exhibits good energy density and power density of 62.3 Wh kg À1 and 448.5 W kg À1 respectively with a specific capacitance of 555.5 F g À1 at 1 A g À1 . The electrode material with good cyclic stability of 85% even after 5000 charge/discharge cycles may be explored as a novel option for supercapacitors.

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A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

Cited by 69 publications

References 51 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

One-pot synthesis of nickel-cobalt hydroxyfluorides nanowires with ultrahigh energy density for an asymmetric supercapacitor

Synthesis and Characterization of Graphene/Binary Metal Molybdate (Graphene/Zn_1−xNi_xMoO₄) Nanocomposite for Supercapacitors

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A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

Cited by 69 publications

References 51 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

One-pot synthesis of nickel-cobalt hydroxyfluorides nanowires with ultrahigh energy density for an asymmetric supercapacitor

Synthesis and Characterization of Graphene/Binary Metal Molybdate (Graphene/Zn1−xNixMoO4) Nanocomposite for Supercapacitors

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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

Synthesis and Characterization of Graphene/Binary Metal Molybdate (Graphene/Zn_1−xNi_xMoO₄) Nanocomposite for Supercapacitors