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This work highlights the potential for the synthesis of new PtSnZn catalysts with enhanced efficiency and durability for methanol oxidation reaction (MOR) in low-temperature fuel cells. In this research, PtZn and PtSnZn nanoparticles deposited on high surface area Vulcan XC-72R Carbon support were created by a microwave-assisted polyol method. The electrochemical performances of synthesized catalysts were analyzed by cyclic voltammetry and by the electrooxidation of adsorbed CO and the chronoamperometric method. The physicochemical properties of obtained catalysts were characterized by transmission electron microscopy (TEM), thermogravimetric (TGA) analysis, energy dispersive spectroscopy (EDS) and by X-ray diffraction (XRD). The obtained findings showed the successful synthesis of platinum-based catalysts. It was established that PtSnZn/C and PtZn/C catalysts have high electrocatalytic performance in methanol oxidation reactions. Catalysts stability tests were obtained by chronoamperometry. Stability tests also confirmed decreased poisoning and indicated improved stability and better tolerance to CO-like intermediate species. According to activity and stability measurements, the PtSnZn/C catalyst possesses the best electrochemical properties for the methanol oxidation reaction. The observed great electrocatalytic activity in the methanol oxidation reaction of synthesized catalysts can be attributed to the beneficial effects of microwave synthesis and the well-balanced addition of alloying metals in PtSnZn/C catalysts.
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http://dx.doi.org/10.3390/ma16134617 | DOI Listing |
Inorg Chem
December 2024
Institute for Energy Research, Institute of Carbon Neutrality Development, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
Pd-based alloys are among the most attractive catalysts for direct alcohol fuel cells. However, their widespread use is limited by the high cost of Pd and their susceptibility to deactivation by surface-adsorbed reaction intermediates, particularly CO. In this study, we engineered an ultrathin 2D PdCr metallene to minimize Pd usage and doped it with phosphorus to enhance its CO tolerance.
View Article and Find Full Text PDFBiotechnol Appl Biochem
December 2024
Department of Biochemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.
Targeting alpha-glucosidase (maltase-glucoamylase [MGAM] and sucrase-isomaltase [SI]) under diabetes conditions is important to overcome hyperglycemia. Moreover, it is necessary to mitigate hyperglycemia-mediated oxidative stress to evade the progression of diabetes-associated secondary complications. Hence, in the present study, under-explored Nyctanthes arbor-tristis flowers (NAFs) were studied for inhibition of alpha-glucosidase activities.
View Article and Find Full Text PDFChem Biodivers
December 2024
CSIR - North East Institute of Science and Technology, Centre for Pre-clinical Studies, Pulibor, 785006, Jorhat, INDIA.
This study highlights the prooxidant, antiproliferative and anti-inflammatory potential of ripe Meyna spinosa Roxb. ex Link fruit extracts. Chemical analysis by HRMS and AAS identified compounds like ursolic acid, oleanolic acid, lupeol, betulin, scopoletin, phloroglucinol, secoxyloganin, etc and micro-elements like iron, copper, zinc, and manganese.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
TU Berlin University: Technische Universitat Berlin, Fachbereich Keramische Werkstoffe, Hardenbergstr. 40, 10623, Berlin, GERMANY.
Carbon dioxide hydrogenation to methanol is a key chemical reaction to store energy in chemical bonds, using carbon dioxide as an energy sink. Indium oxide is amongst the most promising candidates for replacing the copper and zinc oxide catalyst, which is industrially applied for syngas mixtures but less idoneous for educts with carbon dioxide due to instability reasons. The polymorph of indium oxide and the operating conditions remain to be optimized for optimal and stable performance.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
December 2024
Ruhr University Bochum, Analytische Chemie, Universitätsstr 150, 44780, Bochum, GERMANY.
We propose a hybrid electrocatalytic-bioelectrocatalytic reaction cascade integrated on a gas diffusion electrode for CO2 reduction under selective formation of methanol. Ag-Bi2O3 selectively reduces gaseous CO2 to formate at neutral pH conditions. A subsequent enzymatic cascade comprising formaldehyde dehydro-genase and alcohol dehydrogenase, which are both nicotinamide adenine dinucleotide (NAD)-dependent, further reduce formate sequentially to formaldehyde and methanol.
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