MnMoO<sub>4</sub>·4H<sub>2</sub>O nanoplates grown on a Ni foam substrate for excellent electrochemical properties

Cao, Yunjiu; Li, Wenyao; Xu, Kaibing; Zhang, Yuxin; Ji, Tao; Zou, Rujia; Yang, Jianmao; Qin, Zongyi; Hu, Junqing

doi:10.1039/c4ta04019h

Cited by 115 publications

(40 citation statements)

References 42 publications

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“…It can be clearly seen that the CV curves exhibit a similar shape over all the scans, indicating good kinetic reversibility of the NiMoS4 electrode. 33,34 Moreover, it can be deduced that the electrode presents low polarization 33 and rapid electronic and ionic transportation 18,35 since the anodic and cathodic peaks slightly shift towards the positive and negative potentials respectively at increasing scan rates. The CV curves of NiMoS4-A at different scan rates are presented in Figure 4b.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

Lan

Humphreys

et al. 2017

J. Electrochem. Soc.

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Transition metal sulfides have been suggested as promising materials for efficient energy storage with superior electrochemical performances. Compound NiMoS4-A was synthesized by a facile chemical co-precipitation process, followed by calcining at 450 o C in Ar. The asprepared NiMoS4-A electrode exhibits a high specific capacity of 313 C g -1 at 1 A g -1 and good rate capability (83% retention at 10 A g -1 ). Electrochemical impedance spectroscopy (EIS) results indicate that the good performances could be attributed to the low internal and charge transfer resistances. Additionally, the quantitative charge storage analysis reveals that the Faradaic redox process dominates at lower scan rates (78% at 1 mV s -1 ), while the capacitive effect dominates at higher scan rates (56% at 20 mV s -1 ). Furthermore, a hybrid supercapacitor (HSC), with NiMoS4-A as the positive electrode and activated carbon (AC) as the negative electrode, displays a high energy density of 35 Wh kg -1 at an average power density of 400 W kg -1 . Meanwhile, the HSC exhibits excellent cycle stability, maintaining 82% of the initial capacitance after 10000 charge-discharge cycles even at a high current density of 5 A g -1 . These good electrochemical performances indicate that NiMoS4-A is a promising positive electrode material for hybrid supercapacitors.3

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Section: Resultsmentioning

confidence: 99%

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

Lan

Humphreys

et al. 2017

J. Electrochem. Soc.

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“…Binder free electrode has remarkable advantages, such as better conductivity of the active materials with current collector, faster electron diffusion [26], and higher rate capability [27,28]. Later, Cao et al reported MnMoO 4 ·4H 2 O nanoplates grown directly on Ni foam as a binderfree electrode presented a great specific capacitance of 2300 F g −1 at 4 mA cm −2 and 92% of the initial specific capacitance remained after 3000 cycles at a scan rate of 5 mV s −1 [29]. Meanwhile, there are few reports on the device performance of manganese molybdate supercapacitors, especially the asymmetric supercapacitors which theoretically have better electrochemical performance.…”

Section: Introductionmentioning

confidence: 96%

A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

Zhang

Wang

et al. 2016

Electrochimica Acta

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“…The highest specific capacitance for NiWO 4 nanostructures was 586.2 F g -1 at 0.5 A g -1 . [26][27][28] In this work, for the first time, we used an easily-controlled one-pot hydrothermal method to directly synthesize NiWO 4 Table 1. Ye et al 25 used the hydrothermal method to prepare CoWO 4 on reduced graphene oxide as supercapacitors, which achieved a specific capacitance of 159.9 F g -1 at 5 mV s -1 calculated from CV curves and a capacitance retention of ~94.7% after 1000 cycles.…”

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confidence: 99%

One pot synthesis of nickel foam supported self-assembly of NiWO₄ and CoWO₄ nanostructures that act as high performance electrochemical capacitor electrodes

et al. 2015

J. Mater. Chem. A

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In this work, we report a facile one-step hydrothermal approach to synthesize NiWO 4 and CoWO 4 nanostructures on nickel foam as the binder-free electrodes for use as supercapacitors. The as-synthesized materials showed excellent electrochemical performance, with a high specific capacitance of 797.8 F g -1 and 764.4 F g -1 at a current density of 1 A g -1 after 3000 cycles, increasing the current density by 20 times, the rate capabilities still maintaining 55.6% and 50.6% of the original value for NiWO 4 /Ni foam and CoWO 4 /Ni foam, respectively. Moreover, both of these materials exhibited outstanding cycling stability, the 6000 th cycle at 50 mV s -1 demonstrated 2.06 and 2.81 times, better capacitance than the initial cycles for NiWO 4 /Ni foam and CoWO 4 /Ni foam, respectively. To our knowledge, this capacitance performance is better than any previously reported for these materials and is a consequence of the highly evolved surface area/microstructure of the materials formed by this technique. IntroductionIn order to satisfy the increasing demands for energy, many energy storage devices have been explored and intensively developed. Much attention has been paid to supercapacitors, also known as the electrochemical capacitors (ECs) in recent years due to their outstanding and unique abilities such as fast charge-discharge rate, high power density and long-cycle lifespan. 1 Based on their different charge storage mechanisms, supercapacitors can be classified into two groups: electrical double layer capacitors (EDLCs) and pseudocapacitors (PCs). EDLCs, carbon-based nanomaterials for example, store electrical energy via reversible ion-absorption at the interface of electrode and electrolyte. Compared with EDLCs, PCs exhibit higher specific capacitance and energy density, which are attributed to the fast reversible redox reactions between the different valence states of the transition metal oxide used as the electrode. Much effort has been focused on transition metal oxide (TMO) for PCs 7 . However, the poor electrical conductivity and the rapid decline of the capacitance for most binary metal oxides are the big hurdles to their practical applications. Ternary transition metal oxides with two different metal cations are promising electrode candidates for energy-storage applications. The combination of two different metal cations could enhance the conductivity greatly or provide a wide range of oxidation states in comparison with their individual binary oxide counter parts thus potentially enabling improvements in electrochemical properties. Accordingly, various ternary transition metal oxides with controlled morphologies have been synthesized and achieved better electrochemical performance, such as NiCo 2 O 4 , 8,9 CoMoO 4 , 10 NiMoO 4 , 11 and CoMn 2 O 4 . 12 Currently, the design and synthesis of novel ternary transition metal oxides nanomaterials with superior electrochemical properties is still a key area of research. Another method to enhance the conductivity could be exchanging O by S.13,14 Compared with meta...

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MnMoO₄·4H₂O nanoplates grown on a Ni foam substrate for excellent electrochemical properties

Cited by 115 publications

References 42 publications

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

One pot synthesis of nickel foam supported self-assembly of NiWO₄ and CoWO₄ nanostructures that act as high performance electrochemical capacitor electrodes

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MnMoO4·4H2O nanoplates grown on a Ni foam substrate for excellent electrochemical properties

Cited by 115 publications

References 42 publications

Synthesis of NiMoS4for High-Performance Hybrid Supercapacitors

Synthesis of NiMoS4for High-Performance Hybrid Supercapacitors

A high energy density asymmetric supercapacitor from ultrathin manganese molybdate nanosheets

One pot synthesis of nickel foam supported self-assembly of NiWO4 and CoWO4 nanostructures that act as high performance electrochemical capacitor electrodes

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MnMoO₄·4H₂O nanoplates grown on a Ni foam substrate for excellent electrochemical properties

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

Synthesis of NiMoS₄for High-Performance Hybrid Supercapacitors

One pot synthesis of nickel foam supported self-assembly of NiWO₄ and CoWO₄ nanostructures that act as high performance electrochemical capacitor electrodes