VOx@MoO3 Nanorod Composite for High‐Performance Supercapacitors

Wang, Siqi; Cai, Xiang; Song, Yu; Sun, Xiaoqi; Liu, Xiaoxia

doi:10.1002/adfm.201803901

Cited by 59 publications

(26 citation statements)

References 51 publications

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“…Note that all the diffraction peaks are relatively wide, which may be due to a relatively low crystallinity of the material. No characteristic peaks corresponding to MoO 3 are observed in the XRD patterns, which may result from the fact that MoO 3 is amorphous [22].…”

Section: Resultsmentioning

confidence: 99%

MoO3-Doped MnCo2O4 Microspheres Consisting of Nanosheets: An Inexpensive Nanostructured Catalyst to Hydrolyze Ammonia Borane for Hydrogen Generation

Feng

Ding

et al. 2018

Nanomaterials

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Production of hydrogen by catalytically hydrolyzing ammonia borane (AB) has attracted extensive attention in the field of catalysis and energy. However, it is still a challenge to develop a both inexpensive and active catalyst for AB hydrolysis. In this work, we designed a series of MoO3-doped MnCo2O4 (x) catalysts, which were fabricated by a hydrothermal process. The morphology, crystalline structure, and chemical components of the catalysts were systematically analyzed. The catalytic behavior of the catalyst in AB hydrolysis was investigated. Among these catalysts, MoO3-doped MnCo2O4 (0.10) microspheres composed of nanosheets exhibited the highest catalytic activity. The apparent activation energy is 34.24 kJ mol−1 and the corresponding turnover frequency is 26.4 molhydrogen min−1 molcat−1. Taking into consideration the low cost and high performance, the MoO3-doped MnCo2O4 (0.10) microspheres composed of nanosheets represent a promising catalyst to hydrolyze AB for hydrogen production.

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Section: Resultsmentioning

confidence: 99%

MoO3-Doped MnCo2O4 Microspheres Consisting of Nanosheets: An Inexpensive Nanostructured Catalyst to Hydrolyze Ammonia Borane for Hydrogen Generation

Feng

Ding

et al. 2018

Nanomaterials

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“…The main hindrance in V 2 O 5 electrode usage for potential commercial applications is their electrochemical instability, write-erase stability, and trapping-related degradations. [23,24] These reports highlighted the modifications in the electronic structure and chemical environment of V 2 O 5 that led to the electrode performance enhancements.Research on V 2 O 5 -based EESDs is still in its infancy with only a few reports appeared in the literature. In principle, the components should offer synergistic enhancements in the charge capacitance and also produce obvious color change during the charge insertion/extraction.…”

mentioning

confidence: 96%

Ultra‐Thin Manganese Dioxide‐Encrusted Vanadium Pentoxide Nanowire Mats for Electrochromic Energy Storage Applications

Surendren

Aparna

Deb

2019

Adv Materials Inter

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is relatively inexpensive and eco-friendly material that exhibits outstanding theoretical capacitance values with a distinct electro-polychromism. [17] However, studies exploiting their concurrent electropolychromism and energy-storing performance in devices are still aberrant. The main hindrance in V 2 O 5 electrode usage for potential commercial applications is their electrochemical instability, write-erase stability, and trapping-related degradations. [18] Constructing the thin film-based EESD electrodes needs a critical selection of components. In principle, the components should offer synergistic enhancements in the charge capacitance and also produce obvious color change during the charge insertion/extraction. Such bifunctionality could be used for either online charge level monitoring or in the energy storing smart window applications. Moreover, the electrochemical stability of transparent conductors must not be compromised by the adopted process as explained by the work of Cai et al. [19] Typically, researchers employ techniques like nanostructuring [20] or binary [21] /ternary [22] hybridizations of materials as effective ways to improve the capacitance of TMOs. The synergistic effect of a thin layer of TMOs on V 2 O 5 nanostructure in enhancing the capacitance and cyclic stability is described in some recent publications. [23,24] These reports highlighted the modifications in the electronic structure and chemical environment of V 2 O 5 that led to the electrode performance enhancements.Research on V 2 O 5 -based EESDs is still in its infancy with only a few reports appeared in the literature. An EC supercapacitor with V 2 O 5 in gyroid nanostructure is reported by Wei et al. [25] They observed a reduction in the initial specific capacitance to half of the value within the first few cycles before stabilization to a constant value of 155 F g −1 . This behavior was attributed to the structural instability of the gyroid nanostructure, which points to the fact that the capacitance retention is a serious issue even in a controlled nanostructuring of V 2 O 5 . In another paper, carbon nanosphere-decorated V 2 O 5 hybrid nanobelts were synthesized, and the effect of annealing on the capacitance and EC property was studied. [8] In the study, the film with higher capacitance is having a relatively slow response time. More attempts are required for the matured development/understanding of better V 2 O 5 based electrode materials V 2 O 5 electrochromic (EC) coatings are attractive for various photonic applications owing to their multiple oxidation states discernable by distinct colors. The material also shows massive potential for electrochemical energy storage because of their layered structure and high theoretical capacitance. Here, the solution processing of the electrodes composed of an ultra-thin layer of MnO 2 -encrusted V 2 O 5 (V 2 O 5 /MnO 2 ) nanowire mats on fluorinated tin oxide substrates is reported that offer much enhanced electrochemical stability along with a superior energy storage performance com...

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“…MoO 3 is also an interesting material, having a layered structure with stacked bilayer sheets of MoO 6 octahedra held together by van der Waals interactions [6,8]. This MoO 3 structure has been intensively studied as a material for pseudocapacitors and lithium ion batteries because of its ability for insertion/ removal of small ions such as Li + [2,3,6,9,34,35]. However, as a HER electrocatalyst, the intrinsic MoO 3 material has poor electrocatalytic performance due to a lack of active sites like edge sites of MoS 2 [36].…”

Section: Introductionmentioning

confidence: 99%

In situ electrochemically synthesized Pt-MoO3−x nanostructure catalysts for efficient hydrogen evolution reaction

Lee

Kim

et al. 2020

Journal of Catalysis

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Designing and preparing highly active and stable nanostructured Pt-based catalysts with ultralow Pt loading are still challenging for electrochemical applications such as water electrolysis and fuel cells. Here we report for the first time an in situ electrochemical process to synthesize Pt-MoO 3Àx nanoflakes (NFs) overgrown on commercial bulk MoS 2 by employing a facile and simple electrochemical method without using any expensive precious metal salts. The overgrowth of Pt-MoO 3Àx NFs on the bulk MoS 2 surface is conducted by applying electrical energy to the bulk MoS 2 and using Pt counter electrode dissolution in an acidic solution. In spite of their 10 times lower Pt loadings compared to commercial Pt black (Alfa Aesar), the synthesized Pt-MoO 3Àx NFs demonstrate excellent catalytic performance with a Pt mass activity of 2.83 A/mg Pt at the overpotential of 100 mV for electrochemical hydrogen evolution reaction (HER), an approximately 4 times higher value than the value of 0.76 A/mg Pt at the overpotential of 100 mV for commercial Pt black. We hypothesize that the outstanding HER characteristics of Pt-MoO 3Àx NFs are related to the existence and increase of Pt-MoO 3 interfacial sites and oxygen vacancy sites such as Mo 5+ in the Pt-MoO 3Àx NF structures. In addition, our density functional theory (DFT) calculations demonstrate that Pt and O sites at Pt and MoO 3 interfaces and O sites at defective MoO 3Àx in the Pt-MoO 3Àx NFs contribute to accelerate the HER.

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VO_x@MoO₃ Nanorod Composite for High‐Performance Supercapacitors

Cited by 59 publications

References 51 publications

MoO3-Doped MnCo2O4 Microspheres Consisting of Nanosheets: An Inexpensive Nanostructured Catalyst to Hydrolyze Ammonia Borane for Hydrogen Generation

MoO3-Doped MnCo2O4 Microspheres Consisting of Nanosheets: An Inexpensive Nanostructured Catalyst to Hydrolyze Ammonia Borane for Hydrogen Generation

Ultra‐Thin Manganese Dioxide‐Encrusted Vanadium Pentoxide Nanowire Mats for Electrochromic Energy Storage Applications

In situ electrochemically synthesized Pt-MoO3−x nanostructure catalysts for efficient hydrogen evolution reaction

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