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• Recent information has been compiled on the application of MOFs for Li-Batteries applications. • MOFs and their composites have been discussed as a cathode/anode material for various Li-batteries. • Performance of MOF-composites is reviewed in terms of specific capacity and cyclic stability. • MOF and their composites are discussed in detail for Li-HEC in separate section. Metal organic frameworks (MOFs) have emerged as a novel class of advanced functional materials due to their many well-known merits (e.g., ultrahigh porosity, favorable pore size distribution, easy functionalization, and structural tailorability). However, their use in various electronics applications is restricted due to their insulating nature. Therefore, a need arises to intercalate MOFs with various functional/conductive materials for synergistic applications like electrode materials (e.g., diverse Li-ion batteries: LIBs). In this review, the recent developments on pristine MOFs and their derived nanostructures (e.g., nanoporous carbons and metal oxides) for electrode applications are discussed in detail. We focused on the recent applications of various MOF-based composites in anodic/cathodic materials (e.g., LIBs, lithium-sulfur batteries (Li-S), lithium-air batteries (Li-O 2), and lithium hybrid electrochemical capacitors (Li-HEC)) along with details associated with their electrochemical performance. This review is expected to help materials scientists to construct a roadmap for the selection of the best possible electrode materials for LIBs. [ABSTRACT FROM AUTHOR]

Metal-organic frameworks (MOFs) belong to a novel class of materials with several advantages (e.g., ultrahigh porosity, tunable pore size distribution, convenience of synthesis, and structural tailor-ability). However, the insulating nature of MOFs is often recognized as a limiting factor in the extension of their applications, especially in electronic fields. In light of such limitations, various functional or conductive materials have been mixed/intercalated with MOFs to improve their potential for such applications (e.g., rechargeable batteries, optoelectronics, and supercapacitors). Lately, many of these composite materials have been recognized as next-generation electrodes for the development of efficient supercapacitors. In this review article, we have critically reviewed the recent advancements in supercapacitor applications of MOFs and their derived composite structures. Further, we have also discussed the application of various categories of electrolytes (e.g., aqueous, organic, ionic liquids, solid-state, and redox electrolytes) and their impacts on the development of MOF-based supercapacitors. [ABSTRACT FROM AUTHOR]

Biowaste derived carbon materials are recently gaining attention owing to their high specific surface area (SSA) and decent electrical conductivity. Herein, pineapple peel derived porous carbon nanosheets have been synthesized at different activation temperatures (PP‐600, PP‐700 and PP‐800). This shows that its high SSA along with hierarchal pore size distribution makes it a suitable electrode material for supercapacitors. Further, the electrochemical performance of the as prepared electrode material was carried out in three different electrolytes viz. acidic (1 M H2SO4), basic (6 M KOH) and neutral (1 M Na2SO4) and among them 1 M H2SO4 electrolyte shows superior electrochemical performance. Furthermore, PP‐800 electrode material displayed highest specific capacitance of 368.8 F/g in 1 M H2SO4 electrolyte, which is much higher when tested and compared in 6 M KOH (34 F/g) and 1 M Na2SO4 (102.7 F/g) electrolytes at a constant current density of 1 A/g. Additionally, symmetrical solid‐state supercapacitor was fabricated by utilizing PP‐800 electrodes and PVA gel electrolyte, that rendered remarkable energy density of ∼43 Wh/kg at a high‐power density of ∼1 kW/kg. The as fabricated PP‐800//PP‐800 device displayed an extraordinary cycle life exhibiting capacitance retention of 83 % after 10000 ultra‐long charge‐discharge cycles. [ABSTRACT FROM AUTHOR]

Biomass derived activated carbon (BDAC) materials are recently gaining attention as an active electrode material for alternative energy storage devices. Biomass is a rich source of carbon and blessed with high specific surface area, hierarchical pore size distribution, good conductivity, easy availability and facile synthesis approaches. These characteristics make BDAC a suitable electrode material for next generation clean and green energy applications. The review examines the recent developments in the usage of biomass derived carbon and their composites for various hybrid electrochemical capacitor (HEC) devices claiming high electrochemical performance in terms of energy and power density. It also summarizes the various synthesis strategies which lead to different morphologies that are beneficial for high performance energy storage applications. Additionally, the review also coins the existing challenges and possible solutions towards developing cost-effective and high performance HECs using biomass derived carbon-based electrodes. Finally, we speculate the future prospects of biomass derived carbon materials for energy storage applications. We expect that this review article will help in the evolution of new insights for the practical energy storage applications of biomass derived carbons. Image 1 • Various biowastes are reviewed as a potential resource for the generation of activated carbon (BDAC). • BDAC are used as one of the electrodes for Li-HEC, Na-HEC, Zn-HEC, and K-HEC. • BDAC are reviewed in terms of their need, morphologies, porosity and conductivity. • BDAC are reviewed to attain superior energy density, power density and long cycle life when used in HECs. [ABSTRACT FROM AUTHOR]