Designed synthesis of porous NiMoO<sub>4</sub>/C composite nanorods for asymmetric supercapacitors

Tong, Boli; Wei, Wutao; Chen, Xueli; Wang, Jing; Ye, Wanyu; Cui, Shizhong; Mi, Liwei

doi:10.1039/c9ce01031a

Cited by 12 publications

(9 citation statements)

References 47 publications

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“…To overcome the poor electronic conductivity of pristine NiMoO 4 , various NiMoO 4 /carbon composites have been synthesized by hybridizing NiMoO 4 nanostructures with graphene [ 30 , 31 ], carbon nanotubes [ 32 ], conducting polymers [ 33 ], and porous carbon architectures [ 34 , 35 ] Alternatively, intentional doping of NiMoO 4 with several kinds of heteroatoms such as Mn [ 36 , 37 ], P [ 38 ], Zn [ 39 ], Ce [ 40 ], or the creation of oxygen vacancies [ 14 , 41 , 42 , 43 ] in the lattice have recently been reported. In addition, NiMoO 4 has also been coupled with other metal oxides [ 44 , 45 , 46 , 47 , 48 , 49 ] or sulfides [ 50 , 51 , 52 ] to form heterostructure electrodes for supercapacitors with improved electrochemical performances.…”

Section: Introductionmentioning

confidence: 99%

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

et al. 2022

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Developing high-performance electrode materials is in high demand for the development of supercapacitors. Herein, defect and interface engineering has been simultaneously realized in NiMoO4 nanowire arrays (NWAs) using a simple sucrose coating followed by an annealing process. The resultant hierarchical oxygen-deficient NiMoO4@C NWAs (denoted as “NiMoO4−x@C”) are grown directly on conductive ferronickel foam substrates. This composite affords direct electrical contact with the substrates and directional electron transport, as well as short ionic diffusion pathways. Furthermore, the coating of the amorphous carbon shell and the introduction of oxygen vacancies effectively enhance the electrical conductivity of NiMoO4. In addition, the coated carbon layer improves the structural stability of the NiMoO4 in the whole charging and discharging process, significantly enhancing the cycling stability of the electrode. Consequently, the NiMoO4−x@C electrode delivers a high areal capacitance of 2.24 F cm−2 (1720 F g−1) at a current density of 1 mA cm−2 and superior cycling stability of 84.5% retention after 6000 cycles at 20 mA cm−2. Furthermore, an asymmetric super-capacitor device (ASC) has been constructed with NiMoO4−x@C as the positive electrode and activated carbon (AC) as the negative electrode. The as-assembled ASC device shows excellent electrochemical performance with a high energy density of 51.6 W h kg−1 at a power density of 203.95 W kg−1. Moreover, the NiMoO4//AC ASC device manifests remarkable cyclability with 84.5% of capacitance retention over 6000 cycles. The results demonstrate that the NiMoO4−x@C composite is a promising material for electrochemical energy storage. This work can give new insights on the design and development of novel functional electrode materials via defect and interface engineering through simple yet effective chemical routes.

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Section: Introductionmentioning

confidence: 99%

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

et al. 2022

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“…Remanence magnetization, M r , is used to explain the magnetization strength of the synthesized compounds where the magnetization maintains when the external magnetic field is zero ( H = 0). [ 18 ] By magnifying the magnetization hysteresis curve (Figure 6b), it was found that the most saturation remanence ( M r ) is 0.20 for S 6 . The squareness ratio magnitude is obtained by the remanence and saturation magnetization ratio ( M rs = M r / M s ).…”

Section: Resultsmentioning

confidence: 99%

“…Application of NiMoO 4 as catalyst in a wide variety of industrial reactions, such as hydrodesulfurization, hydrodenitrogenation, water-gas shift reaction, steam reforming, etc., is suggested. [13] NiMoO 4 has been fabricated by different methods including hydrothermal, [14][15][16][17][18][19][20][21][22] thermal complex decomposition, [23,24] mechanochemical, [25] sonochemical, [26,27] microwave sintering, [28] sol-gel, [29,30] precipitation, [31,32] solvothermal, [33] microwave, [34] etc. However, solid-state route is one of the simplest and extensive synthesis methods to develop various types of materials for certain applications.…”

Section: Introductionmentioning

confidence: 99%

L_x‐β‐NiMoO₄ (L = None, Al, V, Fe, Co) Nanocomposites: Facile Solid‐State Synthesis, Magnetic, Optical, and Electrochemical Properties

Hakimyfard

Samimifar

Ostadjoola

et al. 2022

Crystal Research and Technology

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Synthesis of a class of Lx‐β‐NiMoO4 (L = None, Al, V, Fe, Co) nanocomposites by a facile one‐step solid‐state route at 700, 800, and 900 °C for 8 h is introduced in the present study. The physical and electrochemical properties of the fabricated compounds are studied by X‐ray powder diffraction (XRPD), field‐emission scanning electron microscope, energy‐dispersive X‐ray spectroscopy, Fourier‐transform infrared spectroscopy, UV‐vis, vibrating sampling magnetometer (VSM), and cyclic voltammetry (CV) analyses. XRPD patterns associated with Rietveld analysis data performed by the FullProf program confirm that the as‐prepared samples are crystallized in the β polymorph monoclinic NiMoO4 crystal system. The magnetic property investigated by VSM analysis data shows that the fabricated samples have ferromagnetic behavior. It is found that the highest Ms value is obtained when Fe3+ is doped into the NiMoO4 crystal system. The smallest direct band gap energy (Eg) is obtained for V‐doped NiMoO4 nanocomposite. The electrochemical property of the prepared NiMoO4 nanocomposites is studied by CV analysis. The data confirm that NiMoO4 can be used in energy storage applications. An impedance spectroscopy plot of NiMoO4 reveals that the Z value is about 30 Ω cm−2. The slope of the curve is near to 90° representing a good capacitance behavior of NiMoO4.

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“…In the same method, when the precursor solution is non‐aqueous, the process is termed solvothermal, all other parameters being the same. Though relatively less frequent, there are many solvothermal instances in the open literature for the synthesis and tuning of NiMoO 4 224,226,259,274,281,289,292,326,350,382 . Figure 20 is to portray typical schematic hydrothermal/solvothermal schemes for synthesizing NiMoO 4 and relevant derivatives 54,382 .…”

Section: Preparation Methods Of Nimoo4 Materialsmentioning

confidence: 99%

“…This is so because this strategy offers the most convenient processes and yet conducive outcomes. Table 6 is to impart a brief account of a host of developments in catalytic properties of NiMoO 4 done involving heterostructures and hybrids 121,123,256‐382 . in many cases, doping, defect and/or morphology engineering have been amalgamated with the heterostructure for superior enhancement in catalytic properties either to generate more surface area or more population of active sites or for other special necessities as summarized in Table 6.…”

Section: Tuning the Properties Of Nimoo4 By Different Approachesmentioning

confidence: 99%

Recent developments and future perspectives on energy storage and conversion applications of nickel molybdates

et al. 2022

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Transition metal oxides with two different cations in the same crystal structure are considered to perform better as catalysts due to the synergistic effects causing better charge transfer and the availability of more active sites. Chemicals with molybdate anion (MoO4−) have been proven to have vast industrial importance in arenas like catalysis, supercapacitance, nuclear medicine, calorimetry, etc. In particular, nanostructured nickel molybdate (NiMoO4) is a promising entrant as an electrode substance for sophisticated power bank applications, apart from being a catalyst for chemical reactions involving energy conversion. Engineering of NiMoO4 at different scopes has been proven to cause a vast enhancement in the catalytic performance of nanometric NiMoO4 through improvement in redox reaction kinetics during the last couple of decades. This review imparts a precise thought about NiMoO4 considering all its developments in the unearthing of properties, synthesis routes, and analyzing tunability for improvement in attributes towards focused applications.

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Designed synthesis of porous NiMoO₄/C composite nanorods for asymmetric supercapacitors

Abstract: Porous and carbon composited binary transition metal oxide nanomaterials provide high ionic conductivity and electronic conductivity.

Cited by 12 publications

References 47 publications

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

L_x‐β‐NiMoO₄ (L = None, Al, V, Fe, Co) Nanocomposites: Facile Solid‐State Synthesis, Magnetic, Optical, and Electrochemical Properties

Recent developments and future perspectives on energy storage and conversion applications of nickel molybdates

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Designed synthesis of porous NiMoO4/C composite nanorods for asymmetric supercapacitors

Abstract: Porous and carbon composited binary transition metal oxide nanomaterials provide high ionic conductivity and electronic conductivity.

Cited by 12 publications

References 47 publications

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Synchronous Defect and Interface Engineering of NiMoO4 Nanowire Arrays for High-Performance Supercapacitors

Lx‐β‐NiMoO4 (L = None, Al, V, Fe, Co) Nanocomposites: Facile Solid‐State Synthesis, Magnetic, Optical, and Electrochemical Properties

Recent developments and future perspectives on energy storage and conversion applications of nickel molybdates

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Designed synthesis of porous NiMoO₄/C composite nanorods for asymmetric supercapacitors

L_x‐β‐NiMoO₄ (L = None, Al, V, Fe, Co) Nanocomposites: Facile Solid‐State Synthesis, Magnetic, Optical, and Electrochemical Properties