Biomass-based activated carbon for high-performance supercapacitor applications

We aimed at developing biomass-based activated carbons for high-performance supercapacitor applications. With a strong motivation toward environmentally friendly material production, cost reduction, and process simplification, various waste biomass resources were utilized as carbon precursors. Through a sustainable steam-activation technique followed by controlled carbonization, highly porous activated carbons with optimized micro/mesopore structures were successfully fabricated. These biomass-derived carbons offered high surface area, excellent electrical conductivity, and robust structural stability, enabling superior capacitive behavior. As a result, the obtained electrodes exhibited high power density, remarkable cycling stability, and outstanding rate capability, demonstrating great potential for next-generation eco-friendly supercapacitor energy-storage systems. 

Carbon fiber-based flexible electrodes for supercapacitor applications

We aimed at fabricating different composites through various materials for hybrid supercapacitor application. With the intention of simplifying experiment methods, decreasing the cost of the supercapacitors, as well as minimizing the destruction of the environment, the carbon materials (e.g. carbon fiber papers, carbon nanofibers, biomass-derived carbon), conducting polymer (polyaniline), and metal oxides (NiCo2O4) were employed to make electrodes for supercapacitors through facile techniques, such as electrospinning, heat treatment, in-situ polymerization, and hydrothermal method. 

Binder-free 3D porous electrodes for high-performance supercapacitor applications

We introduce a facile way to improve the performance of NiCo2O4 electrode by introducing a Ni seed layer. The seed layer deposited on Ni foam electrode (NiCo2O4/Ni@NF) shows the higher electrochemical performances, such as superior specific capacity of 1142 C g-1 at a current density of 1 A g-1 with higher cyclic stability of ~96 % even after 5000 cycles at a higher current density of 5 A g-1. These values are higher than that of the electrode (NiCo2O4@NF) without seed layer, which shows the specific capacity of 305 C g-1@1A g-1 and cyclic stability of 84%@1A g-1. The enhanced performance of the NiCo2O4/Ni@NF electrode may be attributed to low interface resistance, fast redox reversible reaction, and improved surface active sites. The asymmetric supercapacitor device is fabricated using the NiCo2O4/Ni@NF electrode as a positive and reduced graphene oxide (rGO)-Fe2O3 nanograin as a negative electrode, and delivers an areal capacitance of 446 mF cm-2 with retention of 82 % after 10000 cycles. The fabricated asymmetric solid state device shows a maximum energy density of 124.3 Wh cm-2 (at a power density of 3.58 kW cm-2) and power density of 14.88 kW cm-2 (at energy density of 31.41 Wh cm-2). 

Biosensors

In our laboratory, particular attention has been given to non-enzymatic biosensor. Biological analytes such as oxalic acid and glucose have been successfully recognized by this procedure. Nanomaterials such as gold nanoparticle along with polypyrrole and rGO have been fabricated with simple approach. And, in present time continuous effort is being put in order to develop a novel material of some better significance. The biosensor has a wide range of application. Not only does it have its importance in medical field, but in various other areas such as environment and food industries it plays a significant role. Biosensor is a very interesting research field and tremendous effort and progress can be seen in the past decade. In addition, the roles of various nanoparticles as an electrocatalyst are also intensively investigated. We have researched on the role nickel phosphate nanoparticle response towards alcohol oxidation. We are continuously working on this particular area and exploring more.