Shape‐Controlled First‐Row Transition Metal Vanadates for Electrochemical and Photoelectrochemical Water Splitting

Khan, Ibrahim; Gu, Yu; Wooh, Sanghyuk

doi:10.1002/tcr.202300127

Cited by 9 publications

(2 citation statements)

References 101 publications

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“…Generally, the MVs are categorized under the M x V y O z structural family in which M is the metal having a lower oxidation state, whereas the V is commonly present in a wide range of oxidation states based on the crystal phase preferably being in the stable V 5+ state [ 56 , 57 ]. In MVs, the presence of vanadium provides different bonding versatility, owing this to its ranging oxidation states from V 2+ , V 3+ , V 4+ , and V 5+ states, among which V 5+ is known to be significantly stable compared to the other states [ 58 ]. The hybridized O 2p orbital in M x V y O z structures offers facile regulation of both the Fermi level and the band edge positions, allowing the tuning of optical, band edge, and catalytic properties in favor of water splitting reactions.…”

Section: Copper Vanadatesmentioning

confidence: 99%

“…Compared to the Cu and O, the V atoms stabilize in V 5+ state, a configuration that complexes with six oxygens leading to the formation of octahedral complexes. Such oxygen- and vanadium-containing octahedra are arranged and/or connected in different structures via edge or corner sharing with other octahedra in chain and layers frameworks to form 3D structures based on the Cu metal and O ion or ions that result in aforementioned copper vanadates [ 58 ].…”

Section: Crystal Structure Of Copper Vanadatesmentioning

confidence: 99%

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State of the Art Progress in Copper Vanadate Materials for Solar Water Splitting

Kalanur,

Seetharamappa,

Sial

et al. 2023

Nanomaterials

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The development of a single junction photoelectrode material having specific properties is essential and challenging for the efficient application in solar water splitting for oxygen production and a high value-added product, hydrogen. Moreover, the present material solutions based on binary metal oxides offer limited catalytic activity and hydrogen production efficiency. Therefore, it is paramount to develop and exploit a unique range of materials derived from ternary metal oxides with specifically engineered properties to advance in photoelectrochemical (PEC) water splitting. Among the ternary oxides, copper vanadates offer promising characteristics, such as a narrow bandgap and catalytic surface properties along with favorable band edges for facile oxygen evolution reaction (OER), which is considered the bottleneck step in performing overall water dissociation. Furthermore, the copper vanadates allow the tuning of the stoichiometry through which a wide range of polymorphs and materials could be obtained. This review provides a complete outlook on the range of copper vanadates and the established synthesis approach, morphology, crystal structure, band edge properties, and PEC characterizations. Mainly, the underlying charge dynamic properties, carrier path length, effect of doping, and influence of surface catalysts are discussed. The review concludes that the advancement toward obtaining low-bandgap materials is a main challenge to overcome the limitations for efficient water dissociation to OER and copper vanadates, which offer a promising solution with their unique properties and advantages. Importantly, intense and strategically focused research is vital to overcome the scientific challenges involved in copper vanadates and to explore and exploit new polymorphs to set new efficiency benchmarks and PEC water splitting solutions.

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Section: Copper Vanadatesmentioning

confidence: 99%

Section: Crystal Structure Of Copper Vanadatesmentioning

confidence: 99%

State of the Art Progress in Copper Vanadate Materials for Solar Water Splitting

Kalanur,

Seetharamappa,

Sial

et al. 2023

Nanomaterials

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A review on progress and prospects of diatomaceous earth as a bio-template material for electrochemical energy storage: synthesis, characterization, and applications

Appiah,

Dzikunu,

Akinwamide

et al. 2024

Ionics

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This comprehensive review explores the remarkable progress and prospects of diatomaceous earth (DE) as a bio-template material for synthesizing electrode materials tailored explicitly for supercapacitor and battery applications. The unique structures within DE, including its mesoporous nature and high surface area, have positioned it as a pivotal material in energy storage. The mesoporous framework of DE, often defined by pores with diameters between 2 and 50 nm, provides a substantial surface area, a fundamental element for charge storage, and transfer in electrochemical energy conversion and storage. Its bio-templating capabilities have ushered in the creation of highly efficient electrode materials. Moreover, the role of DE in enhancing ion accessibility has made it an excellent choice for high-power applications. As we gaze toward the future, the prospects of DE as a bio-template material for supercapacitor and battery electrode material appear exceptionally promising. Customized material synthesis, scalability challenges, multidisciplinary collaborations, and sustainable initiatives are emerging as key areas of interest. The natural abundance and eco-friendly attributes of DE align with the growing emphasis on sustainability in energy solutions, and its contribution to electrode material synthesis for supercapacitors and batteries presents an exciting avenue to evolve energy storage technologies. Its intricate structures and bio-templating capabilities offer a compelling path for advancing sustainable, high-performance energy storage solutions, marking a significant step toward a greener and more efficient future. Graphical Abstract

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The Electrical Conductivity Mechanisms and Dielectric Properties of Multiphase Co-synthesized CuV2O6–MnV2O6

El-Naggar,

Mousa,

Reda

et al. 2024

Metall Mater Trans B

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Many research studies on photodegradation, energy storage applications, and biosensing have focused on single and mixed Cu and Mn divanadates (MV2O6, M2+ = Cu2+ and/or Mn2+). In this work, MV2O6 was synthesized, and its electrical conductivity and dielectric properties were studied. The electrical and dielectric properties were investigated in a frequency range of 0.1-300 kHz and a temperature range of 298 K to 573 K. The results indicate that the DC conductivity, AC conductivity, dielectric constant, dielectric loss factor, and loss tangent of the investigated materials increase with temperature, which support the contribution of grains and grain boundaries to the electrical properties. The materials exhibit non-Debye type relaxation, as indicated by the progression of the relaxation frequency. As frequency increases, the activation energy of AC conduction decreases, indicating that hopping conduction is the dominant mechanism. In all samples, the DC conduction activation energy is higher than the AC conduction activation energy. The circuit model was used to estimate the relaxation times. The results revealed remarkable dielectric characteristics, notably higher dielectric loss tangent values at frequencies below 1 kHz. Consequently, these materials can be used as electromagnetic attenuation absorbers. Graphical Abstract

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Shape‐Controlled First‐Row Transition Metal Vanadates for Electrochemical and Photoelectrochemical Water Splitting

Cited by 9 publications

References 101 publications

State of the Art Progress in Copper Vanadate Materials for Solar Water Splitting

State of the Art Progress in Copper Vanadate Materials for Solar Water Splitting

A review on progress and prospects of diatomaceous earth as a bio-template material for electrochemical energy storage: synthesis, characterization, and applications

The Electrical Conductivity Mechanisms and Dielectric Properties of Multiphase Co-synthesized CuV2O6–MnV2O6

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