High volumetric energy density annealed-MXene-nickel oxide/MXene asymmetric supercapacitor

Xia, Qixun; Fu, Jianjian; Yun, Jinwon; Mane, Rajaram S.; Kim, Kwang Ho

doi:10.1039/c6ra27880a

Cited by 176 publications

(86 citation statements)

References 69 publications

(72 reference statements)

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“…Owing to the increased electrolyte accessible surface area and the additional contribution of pseudocapacitance caused by the MnO 2 , the obtained MnO 2 /Ti 3 C 2 T x composite achieved a specific capacitance of 212 F g −1 , nearly three times higher than that of pristine Ti 3 C 2 T x . Afterward, various transition metal oxides, such as TiO 2 , ZnO, MoO 3 , NiO, and MnO x , were used to form composites with Ti 3 C 2 T x to enhance the electrochemical performance . For example, a ε‐MnO 2 /Ti 3 C 2 T x composite possesses a larger surface area and exhibits a specific capacitance three times greater than that of pristine Ti 3 C 2 T x .…”

Section: Potential Applicationsmentioning

confidence: 99%

Recent Advances in Layered Ti₃C₂T_x MXene for Electrochemical Energy Storage

Xiong

Bai

et al. 2018

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Ti C T , a typical representative among the emerging family of 2D layered transition metal carbides and/or nitrides referred to as MXenes, has exhibited multiple advantages including metallic conductivity, a plastic layer structure, small band gaps, and the hydrophilic nature of its functionalized surface. As a result, this 2D material is intensively investigated for application in the energy storage field. The composition, morphology and texture, surface chemistry, and structural configuration of Ti C T directly influence its electrochemical performance, e.g., the use of a well-designed 2D Ti C T as a rechargeable battery anode has significantly enhanced battery performance by providing more chemically active interfaces, shortened ion-diffusion lengths, and improved in-plane carrier/charge-transport kinetics. Some recent progresses of Ti C T MXene are achieved in energy storage. This Review summarizes recent advances in the synthesis and electrochemical energy storage applications of Ti C T MXene including supercapacitors, lithium-ion batteries, sodium-ion batteries, and lithium-sulfur batteries. The current opportunities and future challenges of Ti C T MXene are addressed for energy-storage devices. This Review seeks to provide a rational and in-depth understanding of the relation between the electrochemical performance and the nanostructural/chemical composition of Ti C T , which will promote the further development of 2D MXenes in energy-storage applications.

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Section: Potential Applicationsmentioning

confidence: 99%

Recent Advances in Layered Ti₃C₂T_x MXene for Electrochemical Energy Storage

Xiong

Bai

et al. 2018

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“…Supercapacitors can repeatedly charge and discharge hundreds of thousands of times, as the energy‐storage process is reversible. MXenes are popular cathode and anode materials in supercapacitors because of their high power densities . Previous studies have shown that Ti 2 CT 2 is a good cathode material for pseudocapacitors with good performance through a novel first‐principles way.…”

Section: Energy Storagementioning

confidence: 99%

“…For Ti 2 CF 2 , the peak is not apparent, whereas for Ti 2 C(OH) 2 the peak is sharp and the peak area is small. What is more, the flat gradient of the IDOS curve of Ti 2 CO 2 in the possible window ranging between 0.40 and 0.25 V (vs. SHE) indicates that most of the charges can be reserved in this potential region . In addition, the pH value also has an effect on the capability to gain and lose charges in Ti 2 CO 2 .…”

Section: Energy Storagementioning

confidence: 99%

“…MXenesa re popular cathode and anode materials in supercapacitors because of their high power densities. [92][93][94] Previous studies have shown that Ti 2 CT 2 is ag ood cathode material for pseudocapacitors with good performance through an ovel first-principles way.T he performance of pseudocapacitors depends on the largee ssential capacitance of the Ti 2 CO 2 nanosheets,w hich gives rise to the chargec apacity,a nd contact with adsorbed cations, which reduces the chargep otential in the electrode. [95,96] We take Ti 3 C 2 T x as an example and analyze the Ramanb ands to discusst he factors that influence supercapacitors.…”

Section: Supercapacitorsmentioning

confidence: 99%

“…What is more, the flat gradiento fthe IDOS curve of Ti 2 CO 2 in the possible window ranging between 0.40 and 0.25 V( vs. SHE) indicates that most of the charges can be reserved in this potential region. [94] In addition, the pH value also has an effect on the capability to gain and lose charges in Ti 2 CO 2 .Inbrief, Ti 2 CT 2 ter-minatedwithOis more suitable for apseudocapacitor cathode materialthan Ti 2 CT 2 terminated with Fand OH. It is not difficult to find that Ti 2 CO 2 nanosheets tend to gain more charget han other Ti 2 CT 2 materials, which indicates that Ti 2 CO 2 nanosheets are promisingc athode electrode materials,w hereas Ti 2 CF 2 nanosheets may qualifyasa node materials.…”

Section: Supercapacitorsmentioning

confidence: 99%

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Functional MXene Materials: Progress of Their Applications

Wang

Cao

et al. 2018

Chemistry An Asian Journal

173

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Nowadays, two-dimensional materials have many applications in materials science. As a novel two-dimensional layered material, MXene possesses distinct structural, electronic, and chemical properties; thus, it has potential applications in many fields, including battery electrodes, energy storage materials, sensors, and catalysts. Up to now, more than 70 MAX phases have been reported. However, in contrast to the variety of MAX phases, the existing MXene family merely includes Ti C, Ti C , (Ti , Nb ) C, (V , Cr ) C , Nb C, Ti CN, Ta C , V C, and Nb C . Among these materials, the Ti C T MXene exhibits prominently high volumetric capacitance, and the rate at which it transports electron is suitable for electrode materials in batteries and supercapacitors. Hence, Ti C T is commonly utilized as an electrode material in ion batteries such as Li , Na , K , Mg , Ca , and Al batteries. What is more, Ti C has the biggest specific surface area among all of these potential MXene phases, and therefore, Ti C has remarkably high gravimetric hydrogen storage capacities. In addition, Ti CO materials display extremely high activity for CO oxidation, which makes it possible to design catalysts for CO oxidation at low temperatures. Furthermore, Ti C T with O, OH, and/or F terminations can be used for water purification owing to excellent water permeance, favorable filtration ability, and long-time operation ability. This review supplies a relatively comprehensive summary of various applications of MXenes over the past few years.

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