Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

Yuan, Changzhou; Wu, Hao Bin; Xie, Yi; Lou, Xiong Wen David

doi:10.1002/anie.201303971

Cited by 2,110 publications

(1,048 citation statements)

References 130 publications

(526 reference statements)

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“…Given that the electrochemical properties of spinel-type transition metal oxides are highly sensitive to their material characteristics, a large number of low-temperature synthesis procedures have been developed for the fabrication of spinel-type transition metal oxides with controlled composition, crystal structures, surface morphologies, and porous structures. 50,[81][82][83][84][85][86][87][88] Although Section 3 provides details of the preparation of spinel-type transition metal oxides and their applications in specific ESSs, here, we highlight the most recent progress in the synthesis of spinel-type transition metal oxides with controlled phases and porous/morphological characteristics.…”

Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

153

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. (2015). Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems. Physical Chemistry Chemical Physics, 17 (46), 30963-30977. Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems AbstractTransition metal oxides possessing two kinds of metals (denoted as AxB3-xO4, which is generally defined as a spinel structure; A, B = Co, Ni, Zn, Mn, Fe, etc.), with stoichiometric or even non-stoichiometric compositions, have recently attracted great interest in electrochemical energy storage systems (ESSs). The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale. Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed. The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale.Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed.

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Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

153

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“…14 However, these methods do not change the intrinsic properties of the metal oxides. 15,16 Therefore, achieving the co-existence of large specific surface area and high conductivity in metal oxides themselves has been desired.…”

Section: Introductionmentioning

confidence: 99%

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

et al. 2015

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Increasing specific surface area and electrical conductivity are two crucial ways to improve the capacitive performance of electrode materials. Nanostructure usually enlarges the former but reduces the later; thus, it is still a great challenge to overcome such contradiction. Here, we report hydrogenated NiCo 2 O 4 double-shell hollow spheres, combining large specific surface area and high conductivity to improve the capacitive performance of supercapacitors. The specific surface area of NiCo 2 O 4 hollow spheres, fabricated via programmed coating of carbon spheres, was enlarged 50% (from 76.6 to 115.2 m 2 g − 1 ) when their structure was transformed from single-shell to double-shell. Furthermore, activated carbon impedance measurements demonstrated that the low-temperature hydrogenation greatly decreased both the internal resistance and the Warburg impedance. Consequently, a specific capacitance increase of 462%, from 445 to 718 F g − 1 , was achieved at a current density of 1 A g − 1 .Underlying such great improvement, the evolution of chemical valence and defect states with co-increase of these two factors was explored through X-ray photoelectron spectroscopy. Moreover, a full cell combined with NiCo 2 O 4 and AC was assembled, and an energy density of 34.8 Wh kg − 1 was obtained at a power density of 464 W kg − 1 . NPG Asia Materials (2015) 7, e165; doi:10.1038/am.2015.11; published online 13 March 2015 INTRODUCTION Supercapacitors, also known as electrochemical capacitors, have attracted great attention because of their outstanding power density, long cycling life and fast charge/discharge ability. 1-3 These virtues make them remarkable candidates for the electrical sources of hybrid electric vehicles, for which strong explosiveness is highly desired. Principally, supercapacitors run according to ion adsorption (electrochemical double-layer capacitors) or fast Faradaic reactions (pseudocapacitors) mechanisms. Comparatively speaking, the former has low specific capacitance and hence hard to satisfy the growing demand of peak-power assistance in electric vehicles. 4 Thus, more and more attentions were focused on pseudocapacitive electrode materials because their energy density associated with Faradaic reactions is much larger than that of electrochemical double-layer capacitors. [5][6][7][8] To improve performances of pseudocapacitors, two crucial factors are usually considered for the electrode materials, they are large specific surface area and high conductivity for electrolyte ions and electrons. On the one hand, large specific surface area will provide more electroactive sites for the Faradaic reactions, and load more doublelayer charges. Along such idea, many kinds of nanomaterials, 9-11 especially hollow spheres, 12 have been developed to improve

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“…. Metal compounds (metal oxides or metal sulphides) Transition metal oxides are promising candidate for supercapacitor electrodes due to the multiple oxidation states/structures that enable rich redox reactions and high specific capacitance [69][70][71]. Thus, enormous effort has been made to design a robust and stable structure which lead to the superior energy density and long lifetime of metal compounds [72,73]. The metal compound prepared by annealing MOFs shows a relatively high cyclic stability than the other methods due to the pore shape and unique structure [74,75].…”

Section: Mofs In Combination With Other Materials As Carbon Sourcesmentioning

confidence: 99%

Recent advancements in metal organic framework based electrodes for supercapacitors

et al. 2018

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Mixed Transition‐Metal Oxides: Design, Synthesis, and Energy‐Related Applications

Cited by 2,110 publications

References 130 publications

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Integrating large specific surface area and high conductivity in hydrogenated NiCo2O4 double-shell hollow spheres to improve supercapacitors

Recent advancements in metal organic framework based electrodes for supercapacitors

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