Development of 2D La(OH)(3) /graphene nanohybrid by a facile solvothermal reduction process for high-performance supercapacitors

作者：Subasri A^*; Balakrishnan K; Nagarajan E R; Devadoss V; Subramania A^*

来源：Electrochimica Acta, 2018, 281: 329-337.

DOI：10.1016/j.electacta.2018.05.142

• Asymmetric supercapacitor
• Lanthanum hydroxide
• Graphene
• Synergetic effect
• Cyclic stability

Nanostructured hybrids have attracted great interest in the development of high-performance supercapacitors. Herein, a novel hierarchical nanohybrid of La(OH)(3) electrostatically anchored onto 2D-Graphene nanosheets (GNs) were prepared by a simple solvothermal reduction method and investigated as an electrode material for supercapacitors for the first time. This 2D La(OH)(3)-G nanohybrid electrode exhibits a specific capacitance of 485 F g(-1) at 1 A g(-1) and 295 F g(-1) at 15 A g(-1) with 61% of capacitance retention from 1 A g(-1) to 15 A g(-1) in 6M KOH in the potential window of -0.2-0.4 V. This nanohybrid electrode provides a convenient and advantageous way for charge and ion transport and highly accessible electroactive sites to improve the performance of supercapacitors. The asymmetric supercapacitor assembled with La(OH)(3)-G nanohybrids as a positive electrode and activated carbon as negative electrode produce the highest specific capacitance of 69 F g(-1) at of 1 A g(-1) and retains 82.6% up to 5000 cycles with 97% Coulombic efficiency in 6M KOH. These electrochemical findings demonstrate La(OH)(3)-G nanohybrid as a potential candidate for supercapacitor applications.

• 出版日期2018-8-10