1.  Enzyme-immobilized 3D silver nanoparticle/graphene aerogel composites towards biosensors
Wongduan Sroysee, Ketsuda Kongsawatvoragul, Phitchayapha Phattharaphuti, Pattranit Kullawattanapokin, Chonticha Jangsan, Worapol Tejangkura, Montree Sawangphruk
Materials Chemistry and Physics,  2022,  277,  125572

The detection of allergen sulfite is essential for food quality control and public health supervision. Here, a high-performance sulfite biosensor was developed from a sulfite oxidase enzyme (SOx) immobilized on silver nanoparticles (AgNPs) decorated on 3D reduced graphene oxide (3D-rGO). 3D-rGO with high specific pore volume and high electroactive surface area is ideal as a supporting material. AgNPs further provide high electrical conductivity or fast charge transfer and serve as an enzyme anchoring site via a stable thiol bonding. The composite material was initially functionalized with the folic acid and cysteine namely rGO@Ag-Cys-FA before immobilized with the SOx. The resultant rGO@Ag-Cys-FA-SOx exhibits high sensitivity and selectivity towards sulfite detection, high bio-electrocatalytic activity, and fast heterogeneous electron transfer rate constant. The biosensor is also tested in a continuous flow injection system to demonstrate the practical use. Besides, the as-produced sensor in this work can be used in the real sample, which is the canned fruit product indicating its potential practical application.

2.  Free carbonate-based molecules in the electrolyte leading to severe safety concern of Ni-rich Li-ion batteries

Nattanon Joraleechanchai, Ruttiyakorn Donthongkwa, Salatan Duangdangchote, Nutthaphon Phattharasupakun, Poramane Chiochan, Kan Homlamai and Montree Sawangphruk  
Chemical Communications,  2022,  58,  779-782

Abstract: The safety of Li-ion batteries is one of the most important factors, if not the most, determining their practical applications. We have found that free carbonate-based solvent molecules in the hybrid electrolyte system can cause a severe safety concern. Mixing ionic liquids to the carbonate-based solvent as the co-solvent at fixed 1M LiPF6 salt can lead to free carbonate-based molecules causing poor charge storage performance and safety concerns.


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