The Application of a Y‐Modified Lanthanum Zirconate Flexible Thin Film for a High‐Performance Flexible Supercapacitor

Abstract

With the rapid developmento fw earable electronics devices, there is increasing demandf or the development of new flexiblee nergy storaged evices with high security, and this has become ah ot research topic. Although flexible supercapacitors are considered to be high-performance energy-storage equipment because of their fast charging/ discharging ability,long cycle life, good reliability,wide operating temperature range, and so on, there are still many drawbacks that need to be overcome. Herein, the La 2 Zr 2 O 7 (LZO) thin film is synthesized as an ew energy-storage material by using af acile electrospinning method and calcination at low temperature. In addition, the mechanism of producing the flexibility of this film is determined by TG, IR, and XRD analyses. As previous studies have suggested that the charges torage of the LZO film can be attributed to the mechanism of oxygeni ntercalation, the Yelementi sd oped into the LZO film to increaset he concentration of oxygen vacancies. The changes in structurala nd electrochemical properties of La 2 Y x Zr 2Àx O 3 (0 x 0.5) nanofibers (LNF-x) with increasing Yc ontent are studiedc arefully to obtain the best doping sample. The LNF-0.1 sample shows the highest areal capacitance of 605.3 mF cm À2 at 2mAcm À2 ,s oasymmetricalf lexible device is fabricated with LNF-0.1 electrodes. This device has ah igh energy density (76.7 mWhcm À2 at 2mWcm À2), good cycling stability, and excellent mechanical flexibility.T his study thus provides an ew research trend for portableand wearable electronics.

Copper‐Catalyzed C−S Coupling of Quaternary Ammonium Salts and Dialkylcarbamodithioic Acid Salts

“…In past decades, alkyl dialkylcarbamodithioates and their derivatives have been widely reported for their excellent biological and pharmacological activities. For example, numerous investigations have shown that alkyl dialkylcarbamodithioates exhibit several bioactivities, such as antiproliferative, antiglaucoma, antibacterial, antifungal, spermicidal, and anti‐breast cancer . Furthermore, in vitro antitumor activities against human myelogenous leukemia K562 cells have been described for alkyl dialkylcarbamodithioates .…”

Rare Earth‐Based Nanomaterials for Supercapacitors: Preparation, Structure Engineering and Application

“…[60] Likewise, Cao et al doped Y element into La 2 Zr 2 O 7 samples to obtain La 2 Y x Zr 2-x O 3 nanofibers containing an increased oxygen vacancy content. [238] The optimized La 2 Y x Zr 2-x O 3 delivered the areal capacitance of 605.3 mF cm À 2 . Equally important, B-site cation as redox active sites can be composed of multiple redox metal ions.…”

“…In general, doping heterogeneous cations in A or B‐site cations of perovskite can improve conductivity or create more charge storage active sites, which is beneficial to its electrochemical properties [238,248] . For substitution in A or B‐site, Zhang and co‐workers explored Sr‐doped lanthanum cobaltate perovskite (La x Sr 1‐ x CoO 3‐ δ ).…”

“…Likewise, Cao et al. doped Y element into La 2 Zr 2 O 7 samples to obtain La 2 Y x Zr 2‐ x O 3 nanofibers containing an increased oxygen vacancy content [238] . The optimized La 2 Y x Zr 2‐ x O 3 delivered the areal capacitance of 605.3 mF cm −2 .…”

“…[253] In general, doping heterogeneous cations in A or B-site cations of perovskite can improve conductivity or create more charge storage active sites, which is beneficial to its electrochemical properties. [238,248] For substitution in A or B-site, Zhang and co-workers explored Sr-doped lanthanum cobaltate perovskite (La x Sr 1-x CoO 3-δ ). With the doping of proper Sr concentration, the La x Sr 1-x CoO 3-δ samples has adjustable oxygen vacancies content to accelerate the charge transfer, which showed an optimal specific capacitance of 747 F g À 1 in 1 m Na 2 SO 4 electrolyte.…”