Jahn-Teller distortions in molybdenum oxides: An achievement in exploring high rate supercapacitor applications and robust photocatalytic potential

Bai, Liqi; Zhang, Yihe; Zhang, Likai; Zhang, Yuanxing; Sun, Li; Ji, Ning; Li, Xiaowei; Si, Haochen; Zhang, Yu

doi:10.1016/j.nanoen.2018.09.028

Cited by 62 publications

(28 citation statements)

References 51 publications

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“…Interestingly, the EXAFS fitting data show that the CoO 1 and CoO 2 bonds become shorter after photoirradiation, which demonstrates the distortion of [CoO 6 ] octahedrons with the stretching along the c axis [ 33,37 ] (Table S1, Supporting Information). Combined with the previous work in TMOs and layered Co(OH) 2 , [ 8,23,38–40 ] the distortion of octahedral structure imparts a large single‐ion magnetic anisotropy and a low‐spin configuration of Co 3+ , which enhances the covalent component for the CoO σ bond, [ 38,41 ] provides enough reactive active sites and exists in the form of CoOOH, [ 39 ] which greatly improves the electrical conductivity and charge transfer efficiency of the materials, and is beneficial to the lowering of energy barrier of redox reactions on the surface of active materials.…”

Section: Resultsmentioning

confidence: 99%

“…[19,20] Recently, the potential of g-C 3 N 4 as a supercapacitor with fast electron transfer has been demonstrated. [12,[21][22][23][24] However, the electrical conductivity of g-C 3 N 4 is lower than that of carbon-based materials, which limits its supercapacitor applications. Inspired by polarized photocatalytic materials, [25,26] constructing built-in electric field for accelerated charge separation is a new strategy to enhance the energy storage capability of electrode materials, [27] which has been mainly applied for promoting lithium, sodium, and aluminum ion storage, [28][29][30] for example, Li et al used the built-in electric field of sulfurized Fe 2 O 3 anode to reduce the activation energy and significantly improve the charge transfer kinetics in sodium batteries.…”

Section: Introductionmentioning

confidence: 99%

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Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

et al. 2020

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Supercapacitors with the advantages of high power density and fast discharging rate have full applications in energy storage. However, the low energy density restricts their development. Conventional methods for improving energy density are mainly confined to doping atoms and hybridizing with other active materials. Herein, a Co 3 O 4 /g-C 3 N 4 p-n junction with excellent capacity is developed and its application in an all-solid-state flexible device is demonstrated, whose capacity and energy density are considerably enhanced by simulated solar light irradiation. Under photoirradiation, the capacity is increased by 70.6% at the maximum current density of 26.6 mA cm −2 and a power density of 16.0 kW kg −1. The energy density is enhanced from 7.5 to 12.9 Wh kg −1 with photoirradiation. The maximum energy density reaches 16.4 Wh kg −1 at a power density of 6.4 kW kg −1. It is uncovered that the lattice distortion of Co 3 O 4 , reduces defects of g-C 3 N 4 , and the facilitated photo-generated charge separation by the Co 3 O 4 /g-C 3 N 4 p-n junction all make contributions to the promoted electrochemical storage performance. This work may provide a new strategy to enhance the energy density of supercapacitors and expand the application range of photocatalytic materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

et al. 2020

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“…As the scan rate increases, the positions of the redox peaks are successively transferred to positive/negative direction, which can be attributed to the fact that the diffusion rate of ions in the solution is slower than the velocity of electrons, which increases the electrochemical polarization and concentration polarization, resulting in peak shift. [38][39][40] The CV curves of the MoO 3 /NF and Ni 3 S 2 /NF are shown in Figure S4a,b, Supporting Information. Figure 3d reveals the GCD curves of the MoO 3 -Ni 3 S 2 /NF-0.5 at current densities from 5 to 30 mA cm −2 , obvious voltage plateaus appear in the GCD curves, and the voltage range of the platform corresponds to the position of the redox peak in the CV curve.…”

Section: Resultsmentioning

confidence: 99%

An Amorphous–Crystalline Nanosheet Arrays Structure for Ultrahigh Electrochemical Performance Supercapattery

Jiang

et al. 2021

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SCs suitable for many different occasions. [1][2][3][4][5][6][7] However, the low energy density limits their extensive commercial applications. Based on the above, hybrid supercapacitors (HSCs) also called supercapattery with battery-type positive electrode as the energy source and electric double-layer capacitor negative electrode as the power source have been designed, it combines the dual advantages of high power density of traditional SCs and high energy density of batteries. [7][8][9][10] Further, the electrochemical properties of the HSCs are mainly determined by the battery-type electrode, so selecting suitable electrode materials or optimizing the electrode structure is essential for obtaining high-performance hybrid devices.Transition metal oxides and sulfides have become the most widely studied battery-type electrodes due to their remarkable electrochemical activity and high specific capacity. [11][12][13] For example, Chen et al. reported the self-supported Ni 3 S 2 nanosheet arrays by a two-step method. Benefiting from its unique 3D sheet structure, the electrode shows superb rate capability and energy density. [14] Kim et al. designed the independent electrode of NiMo 2 S 4 using the successive ionic layer adsorption and reaction (SILAR) method, which also showed high reversible specific capacity. [15] Although some progress has been made in the research of battery-type electrodes, the inherent physical and chemical properties of the single electrode materials may limit the further development. In order to achieve higher electrochemical performance, complex and stable electrode structures are required to be constructed.In the previous work, the first-principles calculations show that amorphous oxides (such as MnO 2 , [16] ) can produce lots of unsaturated suspension bonds, which makes them have a broad application prospect in the field of energy storage. [18][19][20] Liu et al. proposed amorphous manganese oxide as the pseudocapacitive electrode, which proved to possess excellent rate capability and high cycle stability. [21] This may be due to the fact that the loose arrangement of atoms and ions is more conducive to rapid ion transport of the active materials in the bulk of oxides. Sun et al. successfully synthesized MoO 3 by electrochemical deposition technique and pointed out that the disordered structure is likely to release the structural stress caused by the repeated ion deintercalation/intercalation behavior, thus Hybrid supercapacitors (HSCs), also called supercapattery, which can substitute for low power density batteries have attracted extensive interest. However, when HSCs comes to commercial applications, there is still space for improvement in energy density. It seems that designing of electrode with high capacity is an effective measure. Herein, amorphous-crystalline MoO 3 -Ni 3 S 2 /NF-0.5 nanosheet arrays are developed as battery-type electrodes. Specifically, the sheet-like structure of crystalline Ni 3 S 2 can achieve rich structural nanocrystallization, improving the redox reacti...

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“…It is commonly recognized that the instability of the octahedral coordination of the d° orbital of low‐valence Mo ions leads to Jahn–Teller distortion, which is ultimately due to the destruction of the symmetry of the octahedral electron cloud. [ 51 ] Moreover, Jahn–Teller distortion will result in longer MoO bonds, which in turn are weakened. [ 52 ] It is noteworthy that the attenuation of MoO bonds means that the energy consumed by the escape of lattice oxygen is reduced, and the further construction of oxygen vacancies is easier to achieve.…”

Section: Discussionmentioning

confidence: 99%

Molybdenum Dioxide Nanoparticles Anchored on Nitrogen‐Doped Carbon Nanotubes as Oxidative Desulfurization Catalysts: Role of Electron Transfer in Activity and Reusability

Zou

Lin

et al. 2021

Adv Funct Materials

156

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Electron transfer between metal-oxides and supports considerably affects the oxidative desulfurization (ODS) performance of catalysts, while this is far from being well understood. Herein, molybdenum dioxide with oxygen vacancies (V O -MoO 2 ) catalysts derived from Mo-based metal-organic frameworks are anchored on electron-rich nitrogen-doped carbon nanotubes (NC) to obtain excellent ODS activity and reusability. Results show that either dibenzothiophene (DBT) or 4,6-dimethyldibenzothiophene (4,6-DMDBT) is removed 100% on the composite catalyst (V O -MoO 2 @NC) within 40 min of reaction when cumene hydroperoxide is chosen as an oxidant. After five cycles of reaction, DBT and 4,6-DMDBT removal still exceeded 99.5 and 95.0%, respectively. Results from density functional theory calculations and characterizations confirm that the strong electron-donating effect of NC on V O -MoO 2 can promote the dispersion of V O -MoO 2 and reduce the bond energy of the MoO bond, leading to exposure of active sites and enrichment of oxygen vacancies (V O ).Furthermore, the strong interfacial electrostatic interaction caused by the electron transfer from NC to V O -MoO 2 can reduce the leaching of active sites of the catalyst. This study provides a versatile strategy of constructing strong electronic interaction between metal-oxide and support via anchoring on NC for the design of high-performance ODS catalysts.

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Jahn-Teller distortions in molybdenum oxides: An achievement in exploring high rate supercapacitor applications and robust photocatalytic potential

Cited by 62 publications

References 51 publications

Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

An Amorphous–Crystalline Nanosheet Arrays Structure for Ultrahigh Electrochemical Performance Supercapattery

Molybdenum Dioxide Nanoparticles Anchored on Nitrogen‐Doped Carbon Nanotubes as Oxidative Desulfurization Catalysts: Role of Electron Transfer in Activity and Reusability

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Jahn-Teller distortions in molybdenum oxides: An achievement in exploring high rate supercapacitor applications and robust photocatalytic potential

Cited by 62 publications

References 51 publications

Photocatalysis‐Assisted Co3O4/g‐C3N4 p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

Photocatalysis‐Assisted Co3O4/g‐C3N4 p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

An Amorphous–Crystalline Nanosheet Arrays Structure for Ultrahigh Electrochemical Performance Supercapattery

Molybdenum Dioxide Nanoparticles Anchored on Nitrogen‐Doped Carbon Nanotubes as Oxidative Desulfurization Catalysts: Role of Electron Transfer in Activity and Reusability

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Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis

Photocatalysis‐Assisted Co₃O₄/g‐C₃N₄ p–n Junction All‐Solid‐State Supercapacitors: A Bridge between Energy Storage and Photocatalysis