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Hydrogen production using novel catalysts is regarded as one of the most needed technology for the future economic needs and water splitting to give H2 gas, which is a challenging task for large-scale production. This work reports the synthesis of Meso-Cu-BTC metal organic framework and further used for understanding its role in electrochemical hydrogen evolution reaction (HER) in 1 M NaOH solution. Meso-Cu-BTC electrocatalyst showed a less overpotential of 89.32 mV and an onset potential of 25 mV with an appreciable current density. Results show a low Tafel slope of 33.41 mVdec−1 and long-term durability. Thus, the overall results show that Meso-Cu-BTC acted as a good candidate for electrocatalysis towards hydrogen evolution.

In this modern era, there is an increasing significance in the usage of supercapacitor devices in power applications due to their outstanding power density, ultrafast charging/discharging capability, and prolonged cycling ability. Extensive efforts are being made to improve their capacitive performance by engineering high‐performing polymeric materials as electrode and electrolyte materials. Predominantly, the employment of conducting polymer (CP)‐based composite materials as electrode materials has led to practical and theoretical benefits such as the outstanding surface area that facilitates quick access of dispersed electrolyte ions. The insertion of carbon materials such as graphene, carbon nanotubes, and porous carbon within the CPs matrix has an imperative role in refining the overall system‘s specific capacitance. The electrodes′ specific capacitance proficiency and cycling constancy are improved synergistically by integrating both materials for efficient energy‐storage applications. This Minireview encompasses the storage mechanism in different gel polymer‐based electrolytes and their role in enhancing the pseudocapacitance of redox‐active materials for supercapacitor applications. Further, the Minireview focuses on the influence of conducting polymers in promoting the device performance with a view on the synthesis methodology and pseudocapacitive nature. The different types of supercapacitors designed with polymer gel electrolyte, solid polymer electrolyte, and biodegradable polymer‐based electrolytes for improved supercapacitive performance are critically reviewed.

The present study reports the synthesis of a porous Fe-based MOF named MIL-100(Fe) by a modified hydrothermal method without the HF process. The synthesis gave a high surface area with the specific surface area calculated to be 2551 m 2 g –1 and a pore volume of 1.407 cm 3 g –1 with an average pore size of 1.103 nm. The synthesized electrocatalyst having a high surface area is demonstrated as an excellent electrocatalyst for the hydrogen evolution reaction investigated in both acidic and alkaline media. As desired, the electrochemical results showed low Tafel slopes (53.59 and 56.65 mV dec –1 ), high exchange current densities (76.44 and 72.75 mA cm –2 ), low overpotentials (148.29 and 150.57 mV), and long-term stability in both media, respectively. The high activity is ascribed to the large surface area of the synthesized Fe-based metal–organic framework with porous nature.

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Chitosan has become the most known and second abundantly available recyclable, non-hazardous and eco-friendly biopolymer after cellulose with several advantageous biomedical, agriculture, and wastewater treatment applications. As nanotechnology has progressed, researchers have begun incorporating chitosan-based carbon compounds into various compounds, elements, and carbonaceous materials to increase their efficiency and biocompatibility. Chitosan carbon compounds have also been used directly in many applications due to their inherent chelating and antibacterial features and the presence of customizable functional groups. In this review, synthesis technologies and microstructure of chitosan composites and its carbon materials in biomedical, agriculture, and wastewater treatment concerning the administration of abiotic stress within plants, water accessibility for crops, scheming food bear pathogens, photothermal cancer rehabilitation, and heavy water pollutants absorption and removal methods are widely deliberated upon, with a relevant discussion of the techniques that can be used to put these into action. Chitosan is also utilized in miscellaneous applications, including the food sector and cosmetics. Overall, chitosan-based carbon compounds promise to extend agricultural practices while also addressing health concerns in an environmentally friendly manner.

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