Electrochemical sensing of ascorbic acid, hydrogen peroxide and glucose by bimetallic (Fe, Ni)-CNTs composite modified electrode

In this research, bimetallic supported CNT modified electrode (Fe,Ni/CNTs/GCE) has been developed for sensitive, stable and highly elctroactive sensing of glucose, ascorbic acid and hydrogen peroxide. Transition metals such as Iron (Fe) and Nickel (Ni) offer high electrical and thermal conductance, high active surface‐to‐volume ratio and presence of d‐band electrons gives enhanced electrocatalytic behavior. While, CNTs provide high surface area, stability and excellent conductivity. Synthesized material is characterized by SEM, EDS, XRD and FTIR to access morphology, elemental composition and structure. This unique combination is employed for the electrochemical sensing of ascorbic acid, glucose and hydrogen peroxide and different experimental parameters are optimized. Fe,Ni/CNTs/GCE shows good sensing efficiency at pH 7.4 which is ideally suitable for variety of analytes. The modified electrode also show good reproducibility and sensitivity under optimized conditions and can be reused upto 30 cycles without compromising the efficiency. With good linearity, reproducibility and limit of detection, this material possess significant potential as non‐enzymatic biosensor for variety of analytes

Synthesis, design and sensing applications of nanostructured ceria-based materials

Cerium-based materials possess redox properties due to the presence of dual valence states of Ce3+ and Ce4+. In the last few years, the scientific community has paid much attention to designing and synthesizing cerium-based materials through advantageous routes for widespread catalytic and sensing applications in many fields. Cerium materials have been synthesized in many different forms, shapes and sizes. The catalytic and sensing capabilities of cerium nanostructures are highly dependent on their morphologies and can be improved significantly by modifying the sizes and shapes of the nanostructures to develop sensing scaffolds with improved sensing performance. These nanostructures provide a basis for applications in many fields. From a literature survey (2010 to 2015), it can be concluded that the fundamental morphologies, ratios, and capping of cerium nanostructures (CeNSs) constructively affect their properties and applications. Designed sensors utilizing CeNSs exhibit outstanding stability, high selectivity and eminent reproducibility in relation to time and temperature. This review will provide a perspective insight on the future trends in the design of different morphologies of CeNSs and their promising applications

Nitrogen doped carbon quantum dots conjugated with AgNi alloy nanoparticles as potential electrocatalyst for efficient water splitting

An ideal bifunctional electro-catalyst for water splitting is low cost, easily available and have lower over-potential. Here, a new nitrogen doped carbon dots (NDCDs)-AgNi alloy based electrocatalyst is used for electrochemical water splitting. NDCDs-AgNi alloy nanoparticles are synthesized by easy and scalable methods. NDCDs are prepared by pyrolizing ethanolamine and act as a good electrocatalyst for HER. Electrochemical activity of the catalyst is evaluated by cyclic voltammetry and linear swap voltammetry. The prepared electrocatalyst work well under acidic media. To enhance the catalytic performance of the material, the heat treatment at temperature from 300 °C to 500 °C is carried out. After series of optimizations, NDCDs-AgNi alloy demonstrated superior OER activity. The results show that the limiting current density has been increased and the heat treated samples shows HER phenomena