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Journal ArticleDOI: 10.1039/D0CC07970G

Recent advances in perovskite oxides as electrode materials for supercapacitors

04 Mar 2021-Chemical Communications (Royal Society of Chemistry (RSC))-Vol. 57, Iss: 19, pp 2343-2355
Abstract: Owing to the high power density and ultralong cycle life, supercapacitors represent an alternative to electrochemical batteries in energy storage applications. However, the relatively low energy density is the main challenge for supercapacitors in the current drive to push the entire technology forward to meet the benchmark requirements for commercialization. To effectively solve this issue, it is crucial to develop electrode materials with excellent electrochemical performance since the electrode used is closely related to the specific capacitance and energy density of supercapacitors. With the unique structure, compositional flexibility, and inherent oxygen vacancy, perovskite oxides have attracted wide attention as promising electrode materials for supercapacitors. In this review, we summarize the recent advances in perovskite oxides as electrode materials for supercapacitors. Firstly, the structures and compositions of perovskite oxides are critically reviewed. Following this, the progress in various perovskite oxides, including single perovskite and derivative perovskite oxides, is depicted, focusing on their electrochemical performance. Furthermore, several optimization strategies (i.e., modulating the stoichiometry of the anion or cation, A-site doping, B-site doping, and constructing composites) to improve their electrochemical performance are also discussed. Finally, the significant challenges facing the advancement of perovskite oxide electrodes for supercapacitor applications and future outlook are proposed.

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Topics: Perovskite (structure) (56%)

12 results found

Journal ArticleDOI: 10.1016/J.CEJ.2021.130765
Jiali Yu1, Minling Zeng1, Jie Zhou1, Houdao Chen1  +5 moreInstitutions (1)
Abstract: In terms of enhancing the energy storage performance of flexible MXene electrode, both heteroatom doping and introducing electroactive “spacers” are proved to be effective strategies. In this work, a facial protective hydrothermal method is explored to synthesis nitrogen doped porous MXene/TiO2 heterostructure in one pot, which enables a well preserved conductivity of porous N-doped MXene and controlled in-situ generation of uniformly dispersed electroactive TiO2 spacers. This unique hybridized structure provides a chance to integrate several physical and chemical advantages in a complementary easy way. As a result, the assembled freestanding film electrode based on the N-doped porous MXene/TiO2 heterogeneous layers demonstrates excellent energy storage performance with an outstanding specific capacitance value of 2194.33 mF cm−2 (918.69 F g−1), which outperforms most of the heteroatom-doped MXene electrodes reported previously. Besides, the film electrode delivers excellent cycling performance with a 74.39% capacitance retention after 10,000 cycles and the as fabricated flexible supercapacitor displays almost no changes on capacitive performance when subjected to mechanical deformations, indicating its excellent flexibility and stability. This work presents a simple way of modifying MXene with N doping and inserting “spacer” for enhancing the electrochemical performance, and builds up an exciting potential for applying to highly flexible and integrated energy storage devices.

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3 Citations

Journal ArticleDOI: 10.1016/J.EST.2021.103405
Iftikhar Hussain1, Charmaine Lamiel2, Muhammad Ahmad1, Yatu Chen1  +4 moreInstitutions (3)
Abstract: Energy storage devices play an important role in our daily lives. As a kind of new materials, high-entropy alloys (HEAs) avoid the traditional “base element” concept and display a variety of interesting and unusual properties. HEAs have been considered promising electrode materials for energy storage and conversion technologies due to their excellent mechanical, chemical, and physical properties. Herein, we report a review on basic supercapacitor, such as differences in charge storing mechanism of electric double layer capacitive (EDLC)-, pseudocapacitive-, and battery-type electrode materials; differences in symmetric, hybrid, and asymmetric supercapacitor devices; and recent advances in HEAs as an electrode material for supercapacitors. The aim of this review is to combine newly emerge HEAs electrode materials with the basic concepts of supercapacitor and avoid the inflating misinterpretation in between the different energy storage systems. We also suggest critical points to be considered for high performance nanostructured HEAs as newborn electrode materials.

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2 Citations

Open accessJournal ArticleDOI: 10.1088/2053-1591/AC1003
Xucong Sun1, Zeyu Hao1, Haoshan Nan1, Jian Xu1  +1 moreInstitutions (1)
01 Jul 2021-
Topics: Manganate (54%), Lanthanum (53%)

1 Citations

Journal ArticleDOI: 10.1016/J.MATLET.2021.130013
Shaohua Zhong1, Yuqian Chen1, Lan Yang1, Yihui Liu1  +2 moreInstitutions (2)
15 Aug 2021-Materials Letters
Abstract: In this communication, a Ni doped PBCO in the B-position is proposed, the as-synthesized PrBaCo2-xNixO5+δ (PBCNx) material was used as the electrode of oxygen ion-embedded pseudocapacitor and assembled into an asymmetric supercapacitor. The PrBaCo2-xNixO5+δ (x = 0.4, expressed as PBCN04) exhibits excellent electrochemical performance with the maximum specific capacity of 513.1 C g−1, the maximum energy density of PBCN04 //AC device is 48.3 Wh kg−1 and the maximum power density is 20011.8 W kg−1. Those results offer a suitable design of electrode materials for high-performance supercapacitors.

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Topics: Pseudocapacitor (62%), Perovskite (structure) (53%), Electrode (53%) ... show more

1 Citations


144 results found

Journal ArticleDOI: 10.1107/S0567739476001551
Abstract: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations. Revisions are based on new structural data, empirical bond strength-bond length relationships, and plots of (1) radii vs volume, (2) radii vs coordination number, and (3) radii vs oxidation state. Factors which affect radii additivity are polyhedral distortion, partial occupancy of cation sites, covalence, and metallic character. Mean Nb5+-O and Mo6+-O octahedral distances are linearly dependent on distortion. A decrease in cation occupancy increases mean Li+-O, Na+-O, and Ag+-O distances in a predictable manner. Covalence strongly shortens Fe2+-X, Co2+-X, Ni2+-X, Mn2+-X, Cu+-X, Ag+-X, and M-H- bonds as the electronegativity of X or M decreases. Smaller effects are seen for Zn2+-X, Cd2+-X, In2+-X, pb2+-X, and TI+-X. Bonds with delocalized electrons and therefore metallic character, e.g. Sm-S, V-S, and Re-O, are significantly shorter than similar bonds with localized electrons.

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Topics: Ionic radius (55%), Lanthanide contraction (53%), Electronegativity (51%)

46,405 Citations

Journal ArticleDOI: 10.1021/NL802558Y
Meryl D. Stoller1, Sungjin Park1, Yanwu Zhu1, Jinho An1  +1 moreInstitutions (1)
13 Sep 2008-Nano Letters
Abstract: The surface area of a single graphene sheet is 2630 m2/g, substantially higher than values derived from BET surface area measurements of activated carbons used in current electrochemical double layer capacitors. Our group has pioneered a new carbon material that we call chemically modified graphene (CMG). CMG materials are made from 1-atom thick sheets of carbon, functionalized as needed, and here we demonstrate in an ultracapacitor cell their performance. Specific capacitances of 135 and 99 F/g in aqueous and organic electrolytes, respectively, have been measured. In addition, high electrical conductivity gives these materials consistently good performance over a wide range of voltage scan rates. These encouraging results illustrate the exciting potential for high performance, electrical energy storage devices based on this new class of carbon material.

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Topics: Supercapacitor (57%), Potential applications of graphene (57%), Graphene (57%) ... show more

6,912 Citations

Open accessJournal ArticleDOI: 10.1039/C1CS15060J
Abstract: In this critical review, metal oxides-based materials for electrochemical supercapacitor (ES) electrodes are reviewed in detail together with a brief review of carbon materials and conducting polymers. Their advantages, disadvantages, and performance in ES electrodes are discussed through extensive analysis of the literature, and new trends in material development are also reviewed. Two important future research directions are indicated and summarized, based on results published in the literature: the development of composite and nanostructured ES materials to overcome the major challenge posed by the low energy density of ES (476 references).

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6,717 Citations

Open accessJournal ArticleDOI: 10.1039/C3EE44164D
Abstract: Electrochemical energy storage technology is based on devices capable of exhibiting high energy density (batteries) or high power density (electrochemical capacitors). There is a growing need, for current and near-future applications, where both high energy and high power densities are required in the same material. Pseudocapacitance, a faradaic process involving surface or near surface redox reactions, offers a means of achieving high energy density at high charge–discharge rates. Here, we focus on the pseudocapacitive properties of transition metal oxides. First, we introduce pseudocapacitance and describe its electrochemical features. Then, we review the most relevant pseudocapacitive materials in aqueous and non-aqueous electrolytes. The major challenges for pseudocapacitive materials along with a future outlook are detailed at the end.

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Topics: Pseudocapacitance (60%), Pseudocapacitor (52%)

2,911 Citations

Journal ArticleDOI: 10.1002/ADMA.201100984
Yunpu Zhai1, Yuqian Dou2, Dongyuan Zhao1, Pasquale F. Fulvio3  +2 moreInstitutions (3)
09 Nov 2011-Advanced Materials
Abstract: Carbon materials have attracted intense interests as electrode materials for electrochemical capacitors, because of their high surface area, electrical conductivity, chemical stability and low cost. Activated carbons produced by different activation processes from various precursors are the most widely used electrodes. Recently, with the rapid growth of nanotechnology, nanostructured electrode materials, such as carbon nanotubes and template-synthesized porous carbons have been developed. Their unique electrical properties and well controlled pore sizes and structures facilitate fast ion and electron transportation. In order to further improve the power and energy densities of the capacitors, carbon-based composites combining electrical double layer capacitors (EDLC)-capacitance and pseudo-capacitance have been explored. They show not only enhanced capacitance, but as well good cyclability. In this review, recent progresses on carbon-based electrode materials are summarized, including activated carbons, carbon nanotubes, and template-synthesized porous carbons, in particular mesoporous carbons. Their advantages and disadvantages as electrochemical capacitors are discussed. At the end of this review, the future trends of electrochemical capacitors with high energy and power are proposed.

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Topics: Supercapacitor (62%), Carbide-derived carbon (62%), Carbon nanotube (58%) ... show more

2,239 Citations

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