Unveiling capacitive behaviors of MoO2 in different electrolytes and flexible MoO2-based asymmetric micro-supercapacitor

Ma, Ben; Hao, Weiyi; Ruan, Wansheng; Chen, Yuan; Wang, Qiuheng; Teng, Fei

doi:10.1016/j.est.2022.104833

Cited by 15 publications

(8 citation statements)

References 25 publications

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“…Moreover, MoON/SSM exhibits superior electrochemical performance compared to recently reported individual MoO 2 and MoO 3 electrodes. [14,15] The superior electrochemical performance of MoON electrode material is primarily attributed to multiple charge-storage processes contributing simultaneously. Therefore, identifying and quantifying the involved charge-storage kinetics is critical for correctly measuring and reporting the material's performance.…”

Section: Resultsmentioning

confidence: 99%

“…[11] Molybdenum oxides (MoO 2 and MoO 3 ), on the other hand, are well-known for their superb ionic conductivity, high theoretical capacity, and cost-effectiveness. [12][13][14][15] For instance, Ma and co-authors hydrothermally prepared molybdenum dioxide over carbon fiber (MoO 2 @CF), delivering the highest capacitance of 509.8 F g −1 . [14] In another recent report, Wu et al fabricated two separate MoO 2 and MoO 3 on flexible carbon cloth electrodes and obtained a superior specific capacitance of 381 F g −1 for MoO 2 , seven times higher than that of MoO 3 (54.7 F g −1 ).…”

Section: Introductionmentioning

confidence: 99%

“…[12][13][14][15] For instance, Ma and co-authors hydrothermally prepared molybdenum dioxide over carbon fiber (MoO 2 @CF), delivering the highest capacitance of 509.8 F g −1 . [14] In another recent report, Wu et al fabricated two separate MoO 2 and MoO 3 on flexible carbon cloth electrodes and obtained a superior specific capacitance of 381 F g −1 for MoO 2 , seven times higher than that of MoO 3 (54.7 F g −1 ). [15] Therefore, we believe that rationally developing molybdenum oxynitride nanostructured material can assist in achieving extraordinary electrochemical performance by integrating the complementary properties of nitride and oxide phases.…”

Section: Introductionmentioning

confidence: 99%

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Pseudocapacitive Storage in Molybdenum Oxynitride Nanostructures Reactively Sputtered on Stainless‐Steel Mesh Towards an All‐Solid‐State Flexible Supercapacitor

Ranjan,

Kaur

2023

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Exploiting pseudocapacitance in rationally engineered nanomaterials offers greater energy storage capacities at faster rates. The present research reports a high‐performance Molybdenum Oxynitride (MoON) nanostructured material deposited directly over stainless‐steel mesh (SSM) via reactive magnetron sputtering technique for flexible symmetric supercapacitor (FSSC) application. The MoON/SSM flexible electrode manifests remarkable Na+‐ion pseudocapacitive kinetics, delivering exceptional ≈881.83 F g−1 capacitance, thanks to the synergistically coupled interfaces and junctions between nanostructures of Mo2N, MoO2, and MoO3 co‐existing phases, resulting in enhanced specific surface area, increased electroactive sites, improved ionic and electronic conductivity. Employing 3D Bode plots, b‐value, and Dunn's analysis, a comprehensive insight into the charge‐storage mechanism has been presented, revealing the superiority of surface‐controlled capacitive and pseudocapacitive kinetics. Utilizing PVA‐Na2SO4 gel electrolyte, the assembled all‐solid‐state FSSC (MoON/SSM||MoON/SSM) exhibits impressive cell capacitance of 30.7 mF cm−2 (438.59 F g−1) at 0.125 mA cm−2. Moreover, the FSSC device outputs a superior energy density of 4.26 µWh cm−2 (60.92 Wh kg−1) and high power density of 2.5 mW cm−2 (35.71 kW kg−1). The device manifests remarkable flexibility and excellent electrochemical cyclability of ≈91.94% over 10,000 continuous charge–discharge cycles. These intriguing pseudocapacitive performances combined with lightweight, cost‐effective, industry‐feasible, and environmentally sustainable attributes make the present MoON‐based FSSC a potential candidate for energy‐storage applications in flexible electronics.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pseudocapacitive Storage in Molybdenum Oxynitride Nanostructures Reactively Sputtered on Stainless‐Steel Mesh Towards an All‐Solid‐State Flexible Supercapacitor

Ranjan,

Kaur

2023

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“…On the basis of the chemical states of C and N elements discussed above, it can be concluded that the composite does contain g-C 3 N 4 . As for the Mo 3d spectrum of the optimal sample CNM-4 ( Figure 3 c), there are three groups of peaks with binding energy at 230.30 and 233.31 eV, 231.36 and 235.30 eV, as well as 232.27 and 236.37 eV, representing the electron spin splitting of 3d 5/2 and 3d 3/2 of Mo 4+ , Mo 5+ , and Mo 6+ in the composites, respectively [ 20 , 27 ]. The XPS spectrum of the Mo element revealed that the oxidation state of Mo atoms in the composites involved Mo 4+ , Mo 5+ , and Mo 6+ , with the Mo 5+ and Mo 6+ states attributed to the Jahn–Teller effect caused by lattice distortion [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…This result is consistent with the XPS Mo spectrum of pure MoO 2 , also shown in Figure 3 c. Thus, it can be concluded that the molybdenum oxide in the optimal sample CNM-4 is composed of MoO 2 . From the XPS spectrum of O 1s ( Figure 3 d), three peaks centered at the binding energies of 520.21, 531.98, and 533.31 eV could be observed, which can be assigned to the oxygen element in MoO 2 , the N-C-O structure, and free H 2 O, respectively [ 27 ]. Compared with the XPS spectrum of bulk g-C 3 N 4 , the O peak area representing N-C-O in the sample CNM-4 displays an obvious increase, which can be attributed to the O atoms introduced into the g-C 3 N 4 structure by thermal oxidation.…”

Section: Resultsmentioning

confidence: 99%

One-Step Calcination to Gain Exfoliated g-C3N4/MoO2 Composites for High-Performance Photocatalytic Hydrogen Evolution

Chen

et al. 2022

Molecules

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The difficulty of exposing active sites and easy recombination of photogenerated carriers have always been two critical problems restricting the photocatalytic activity of g-C3N4. Herein, a simple (NH4)2MoO4-induced one-step calcination method was successfully introduced to transform bulk g-C3N4 into g-C3N4/MoO2 composites with a large specific surface area. During the calcination, with the assistance of NH3 and water vapor produced by ammonium molybdate, the pyrolytical oxidation and depolymerization of a g-C3N4 interlayer were accelerated, finally realizing the exfoliation of the g-C3N4. Furthermore, another pyrolytical product of ammonium molybdate was transformed into MoO2 under an NH3 atmosphere, which was in situ loaded on the surface of a g-C3N4 nanosheet. Additionally, the results of photocatalytic hydrogen evolution under visible light show that the optimal g-C3N4/MoO2 composite has a high specific surface area and much improved performance, which is 4.1 times that of pure bulk g-C3N4. Such performance improvement can be attributed to the full exposure of active sites and the formation of abundant heterojunctions. However, with an increasing feed amount of ammonium molybdate, the oxidation degree of g-C3N4 was enhanced, which would widen the band gap of g-C3N4, leading to a weaker response ability to visible light. The present strategy will provide a new idea for the simple realization of exfoliation and constructing a heterojunction for g-C3N4 simultaneously.

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Heterojunction assembled CoO/Ni(OH)2/Cu(OH)2 for effective photocatalytic degradation and supercapattery applications

Mohapatra,

Das,

Tripathy

et al. 2023

Environ Sci Pollut Res

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Mixed multimetallic-based nanocomposites have been considered a promising functional material giving a new dimension to environmental remediation and energy storage applications. On this concept, a hybrid ternary CoO/Ni(OH) 2 /Cu(OH) 2 (CNC) composite showing sea-urchin-like morphology was synthesized via one-pot hydrothermal approach, and its photocatalytic and electrochemical performances were investigated. The photocatalytic performance was explored using Congo red (CR) as a dye pollutant under visible light illumination. The presence of mixed phases of ternary metal ions could minimize the recombination e cacy of photogenerated charge carriers on the basis of the heterojunction mechanism, resulting in 90 % degradation of CR dye (40 mg L -1 ). The effect of scavengers coupled with electrochemical experiments revealed O 2 -. radical as the predominating species responsible for the degradation of CR. From the electrochemical analysis of CNC, the well-distinguished redox peaks indicated the battery-type behaviour with a speci c capacity of 405 C g -1 . For practical applications, a hybrid supercapacitor (CNC(+)|KOH|AC(-)) was assembled furnishing an energy density of 42 W h kg -1 at a power density of 5160 W kg -1 at 5 A g -1 along with a high capacity retention and coulombic e ciency of 98.83 % over 5000 cycles.

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Unveiling capacitive behaviors of MoO2 in different electrolytes and flexible MoO2-based asymmetric micro-supercapacitor

Cited by 15 publications

References 25 publications

Pseudocapacitive Storage in Molybdenum Oxynitride Nanostructures Reactively Sputtered on Stainless‐Steel Mesh Towards an All‐Solid‐State Flexible Supercapacitor

Pseudocapacitive Storage in Molybdenum Oxynitride Nanostructures Reactively Sputtered on Stainless‐Steel Mesh Towards an All‐Solid‐State Flexible Supercapacitor

One-Step Calcination to Gain Exfoliated g-C3N4/MoO2 Composites for High-Performance Photocatalytic Hydrogen Evolution

Heterojunction assembled CoO/Ni(OH)2/Cu(OH)2 for effective photocatalytic degradation and supercapattery applications

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