An efficient cathode electrocatalyst for anion exchange membrane water electrolyzer

\ua9 2024 The AuthorsA high performance and durable electrocatalyst for the cathodic hydrogen evolution reaction (HER) in anion exchange membrane (AEM) water electrolyzers is crucial for the emerging hydrogen economy. Herein, we synthesized Pt–C core-shell nanoparticles (core: Pt nanoparticles, shell: N-containing carbon) were uniformly coated on hierarchical MoS2/GNF using pyrolysis of h-MoS2/GNF with a Pt-aniline complex. The synthesized Pt–C core-shell@h-MoS2/GNF (with 11.3 % Pt loading) showed HER activity with a lower overpotential of 30 mV at 10 mA cm−2 as compared to the benchmark catalyst 20 % Pt–C (41 mV at 10 mA cm−2) with improved durability over 94 h at 10 mA cm−2. Furthermore, we investigated the structural stability and hydrogen adsorption energy for Pt13 cluster, C90 molecule, h-MoS2 sheet, Pt13–C90 core-shell, and Pt13–C90 core-shell deposited h-MoS2 sheets using density functional theory (DFT) simulations. We investigated the Pt–C core-shell@h-MoS2/GNF catalyst active sites during HER performance using in-situ Raman analysis as well as DFT. We fabricated AEM water electrolyzers with cathode catalysts of Pt–C core-shell@h-MoS2/GNF and evaluated device performance with 0.1 and 1.0 M KOH at 20 and 60 \ub0C. Our work provides a new pathway to design core-shell electrocatalysts for use in AEM water electrolyzers to generate hydrogen

Preparation of Gelatin Film Incorporated with Extracts of Hemigraphis Colorata Used as Wound Dressing

Hemigraphis coloratais a medicinal plant originates from the tropical regions of kerala and its native is from the sides of Malesia. It is a perennial herb mostly grown as ornamental plant. It is a tribal plant of the tribes of Kerala. It is commonly called as “murikooti or muryanpacha”H.coloratais used as herbal ointments to cure cut wounds, ulcers and most importantly bleedings. It has many valuable properties like anti-microbial and anti-diabetic activities. It acts as an anti oxidant and exhibit free radical scavenging activity. This study is carried out to prepare a gelatin film using the extracts of H. colorata used as wound dressing.</jats:p