Journal ArticleDOI
Electrochemical deposition of uniform and porous Co–Ni layered double hydroxide nanosheets on nickel foam for supercapacitor electrode with improved electrochemical efficiency
Sally M. Youssry,Ibrahim S. El-Hallag,Rajesh Kumar,Go Kawamura,Wai Kian Tan,Atsunori Matsuda,Marwa N. El-Nahass +6 more
TLDR
In this paper , Co−Ni layered double hydroxide (LDH) nanosheets are synthesized on nickel foam (NF) using a simple, facile, and cost effective electrochemical deposition method.Abstract:
In this study, Co–Ni layered double hydroxide (LDH) nanosheets are synthesized on nickel foam (NF) using a simple, facile, and cost effective electrochemical deposition method. We present a comparative study of Co–Ni LDH nanosheets on NF for use in supercapacitor electrodes. The method is based on electrochemical deposition using cyclic voltammetry (CV) with different cycles (4, 6, 8, and 10 cycles). Compared to other cycles, the Co–Ni LDH nanosheets on NF as electrode materials obtained higher specific capacitance at eight cycles. In 1 M potassium hydroxide (KOH), a significant specific capacitance of 3130.8 F/g was obtained at a scan rate of 5 mV/s, with good cyclic stability of 72.4% capacitance retention after 3000 cycles. The uniform and porous structure of Co–Ni LDH nanosheets on NF and the fast ion transfer between the electrolyte–electrode interface and reduced resistance contribute to this superior electrochemical efficiency, confirmed by CV and electrochemical impedance (EIS) studies. Co–Ni LDH nanosheets on NF are promising candidates for low-cost high-efficiency energy storage electrode materials for supercapacitor applications because of their superior performance and ease of preparation. read more
Citations
More filters
Journal ArticleDOI
A review on the current research on microwave processing techniques applied to graphene-based supercapacitor electrodes: An emerging approach beyond conventional heating
TL;DR: In this paper , the authors provide an overview of the latest research on microwave processed graphene-based electrode materials for supercapacitors, focusing on the intrinsic advantages of microwave heating.
Journal ArticleDOI
Microwave-assisted synthesis of iron oxide homogeneously dispersed on reduced graphene oxide for high-performance supercapacitor electrodes
TL;DR: In this paper , the microstructure of the hybrid material consisted of reduced graphene oxide (rGO) nanosheets homogeneously covered by nearly uniform-sized, faceted Fe 3 O 4 nanoparticles.
Journal ArticleDOI
High Surface Area of Crystalline/Amorphous Ultrathin MnO2 Nanosheets Electrode for High-performance Flexible Micro-supercapacitors
TL;DR: In this paper , ultrathin MnO2 nanosheets consisting of crystalline/amorphous phases are prepared by a simple interfacial reaction of surfactant assistance in water-bath with high specific surface area of 317.56 m2 g−1, which can accelerate ionic transport and provide more active sites during electrochemical reaction.
Journal ArticleDOI
Preparation of ZnCo-MOF/PPy/Ag2O ternary composites for high-performance flexible supercapacitors
TL;DR: An asymmetric supercapacitor (ASC) assembled with MPA/Ag2O-4 and activated carbon demonstrates a wide potential window of 2 V, high area capacitance of 148 mF/cm2 at 0.5 mA/cm 2 as mentioned in this paper .
Journal ArticleDOI
Oxygen-vacancy europium-doped MnO2 ultrathin nanosheets used as asymmetric supercapacitors
Yanmei Liang,Dan Hua Zhu,Shixing Chao,Meihua Hu,Danqin Li,Weiqiang Zhou,Jingkun Xu,Xuemin Duan,Peipei Liu +8 more
TL;DR: In this article , europium-doping MnO2 (Eu5%-MnO2) ultrathin nanosheets (3.4 nm) possessing rich oxygen vacancies via a facile co-precipitation strategy were synthesized.
References
More filters
Journal ArticleDOI
Carbon-based materials as supercapacitor electrodes
Lili Zhang,Xiu Song Zhao +1 more
TL;DR: This tutorial review provides a brief summary of recent research progress on carbon-based electrode materials forsupercapacitors, as well as the importance of electrolytes in the development of supercapacitor technology.
Journal ArticleDOI
Carbon-based Supercapacitors Produced by Activation of Graphene
Yanwu Zhu,Shanthi Murali,Meryl D. Stoller,K. J. Ganesh,Weiwei Cai,Paulo J. Ferreira,Adam Pirkle,Robert M. Wallace,Katie A. Cychosz,Matthias Thommes,Dong Su,Eric A. Stach,Rodney S. Ruoff +12 more
TL;DR: This work synthesized a porous carbon with a Brunauer-Emmett-Teller surface area, a high electrical conductivity, and a low oxygen and hydrogen content that has high values of gravimetric capacitance and energy density with organic and ionic liquid electrolytes.
Journal ArticleDOI
Anomalous Increase in Carbon Capacitance at Pore Sizes Less Than 1 Nanometer
TL;DR: The results challenge the long-held axiom that pores smaller than the size of solvated electrolyte ions are incapable of contributing to charge storage.
Journal ArticleDOI
Conducting-polymer-based supercapacitor devices and electrodes
TL;DR: In-situ high-resolution transmission electron microscopy (HRTEM) studies of the structural transformations that occur during the synthesis of carbon-coated LiFePO4 and heat treatment to elevated temperatures were conducted in two different electron microscopes as discussed by the authors.
Journal ArticleDOI
Overview of current development in electrical energy storage technologies and the application potential in power system operation
TL;DR: A comprehensive and clear picture of the state-of-the-art technologies available, and where they would be suited for integration into a power generation and distribution system is provided in this article.