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Summary: In recent years, combining carbon-based materials with metal oxides to improve the electrochemical performance of electrodes has attracted great interest. However, research on the growth and charge storage mechanisms of such hybrid electrodes has been limited. This study synthesized NiOx@graphene nanocomposites using a simple, reproducible, low-cost, and fast method, and explored their growth and charge storage mechanisms. It was found that the microstructure and morphology of the electrode materials were dependent on the choice of metal precursor, which directly affected the electrochemical performance of the electrodes. This work provides a new affordable approach for the synthesis and design of hybrid electrode architectures with high electrochemical performance, and offers experimental support.
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Summary: This study presents a high-performance asymmetric supercapacitor (ASC) using CoNi-LDH derived from African marigold flower-like layered double hydroxide as a cathode and MAC synthesized from oxygen-rich hydrochar as an anode. The ASC device exhibited remarkable energy densities and long cycle life, demonstrating its potential for energy storage applications.
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JOURNAL OF ENERGY STORAGE
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Ankita Mohanty et al.
Summary: MOFs are emerging as new materials for supercapacitor applications due to their inherent porous characteristics. However, the insulating nature of pristine MOFs has hindered their usage in supercapacitors, leading to successful strategies such as hybridization with other materials or using MOFs as templates to derive metal oxides, carbon, or hydroxides.
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Zhiqiang Liu et al.
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JOURNAL OF POWER SOURCES
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Summary: There is a growing interest in supercapacitors for their high specific power, fast charge/discharge rates, and long cycling stability. However, supercapacitors containing transition metal oxides, carbon-based materials, and conducting polymers commonly suffer from inferior ion-transport kinetics and poor electronic conductivity, which can affect the rate capability and cycling stability of the electrodes.
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Mohammad R. Thalji et al.
Summary: The W18O49 nanowires-reduced graphene oxide nanocomposite shows high specific capacitance and excellent rate performance in AlCl3 aqueous electrolyte, making it a promising new active material for supercapacitors electrode. It also exhibits high energy density and power density, opening up a new direction for high-performance energy storage in Al3+ electrolyte.
CHEMICAL ENGINEERING JOURNAL
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De Wang et al.
Summary: This study focuses on the design of cost-effective multifunctional electromaterials for supercapacitors and oxygen evolution reaction (OER) to enhance their functionalities in energy storage and conversion. Different ratios of cobalt and nickel phosphate composites were synthesized and systematically studied for their capacity and OER properties. The optimal electroconductibility, structural adjustment, electrochemical active sites, and activities for capacity and OER were obtained from the composites with different ratios of Co/Ni, showing potential for improving the practicality of asymmetric supercapacitors using Bi-based electromaterials.
ACS APPLIED MATERIALS & INTERFACES
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Yidong Zhang et al.
Summary: A facile strategy was presented to fabricate hierarchical porous supercapacitor materials using NaCl-assisted MOFs gel as a structure-directing template, which can provide broad ion diffusion pathway and low charge-transfer resistance. The use of seawater instead of NaCl for preparing hierarchical porous carbon also showed good capacitive performance, demonstrating potential for advanced utilization of MOFs gel and seawater in designing electrodes materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
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Energy & Fuels
Sunaina Saini et al.
Summary: Activated carbon based electrode materials show promising applications in supercapacitors, fuel cells, and batteries due to their large surface area and porous structure. Carbonaceous materials and pseudo-capacitive materials have different charge storage mechanisms, with the latter achieving higher charge storage levels but also facing challenges such as lack of conductivity. Compounding carbon-based materials with pseudo-capacitive materials is a viable solution for achieving higher energy density in supercapacitors.
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Tongzhou Wang et al.
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Meng Zhao et al.
Summary: The study introduces a mixed organodiselenides promoter to enhance the sulfur redox kinetics in lithium-sulfur batteries. This promoter enables high discharge capacity, energy density, and stability under practical working conditions, showcasing the potential for constructing high-energy-density Li-S batteries with improved performance.
Review
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Manikandan Kandasamy et al.
Summary: Supercapacitors, recognized as energy storage devices in sustainable and renewable energy storage, offer higher energy and power density but face challenges such as low energy density and cycle life compared to batteries. Researchers are focusing on improving their electrochemical properties through the fabrication of metal oxide nanostructures and modification methods like doping, introducing oxygen vacancies, and hybridization with carbon allotropes. This review presents advancements in supercapacitor energy storage and highlights approaches in fabricating supercapacitor electrode materials, providing valuable insights for researchers in the energy storage field.
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S. Karthikeyan et al.
Summary: Energy security is a top priority for individuals and governments. At present, energy such as chemical energy, solar energy, and thermal energy are stored in batteries, which have limitations in terms of energy density and power density. Supercapacitors, with high power density and comparable energy density, offer a solution for fast charging and discharging operations, thus addressing energy storage problems in electronic devices and various sectors.
MATERIALS TODAY-PROCEEDINGS
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Subramanian Natarajan et al.
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