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Träfflista för sökning "WFRF:(Gupta Divyani) srt2:(2023)"

Sökning: WFRF:(Gupta Divyani) > (2023)

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  • Gupta, Divyani, et al. (författare)
  • Self-powered NH3 synthesis by trifunctional Co2B-based high power density Zn-air batteries
  • 2023
  • Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry. - 2050-7488 .- 2050-7496. ; 11:23, s. 12223-12235
  • Tidskriftsartikel (refereegranskat)abstract
    • The electrochemical production of NH3 by Zn-air batteries is a viable and economical approach to realize sustainable and competent energy conversion. We report the environment friendly, cost-effective, and energy efficient sonochemical synthesis of amorphous Co2B nanosheets for trifunctional electrocatalysis. The catalyst exhibits a high NH3 yield rate (2.98 mg h(-1) mg(cat.)(-1)), F.E (20.45%), and TOF of 0.74 h(-1) at -0.3 V vs. RHE, thereby unveiling an outstanding performance for the artificial ammonia synthesis. The reliable and true NH3 production is premediated by following rigorous protocol that involves the purification of gas supplies, elimination of N-contaminants, and quantification of NH3 by different methods, UV-Vis spectroscopy and N-15(2) isotope labelling experiments. More interestingly, DFT calculations on the Co2B catalyst surface shed light on the efficient NRR owing to the presence of Co active sites and possible HER suppression. The optimized Co2B catalyst shows outstanding oxygen bifunctional activity. When employed as an air-cathode for Zn-air batteries, it exhibited remarkable electrocatalytic activity delivering an open circuit potential of 1.45 V with a high power density of 500 mW cm(-2) and an energy density of 1078 W h kg(-1), which can perform NH3 generation with an overall NH3 production yield rate of 1.048 mg h(-1) mg(cat.)(-1).
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  • Kaur, Sukhjot, et al. (författare)
  • Efficient CO2 utilization and sustainable energy conversion via aqueous Zn-CO2 batteries
  • 2023
  • Ingår i: Nano Energy. - : Elsevier. - 2211-2855 .- 2211-3282. ; 109
  • Tidskriftsartikel (refereegranskat)abstract
    • Looking towards the economical and efficient carbon dioxide (CO2) utilization, metal-CO2 batteries uphold a great potential to enhance the efficiency of CO2 conversion to fuels. Pertaining to this, we have fabricated B, N -containing carbon with tubular morphology (C-BN@600) derived from ionic liquid (IL) and metal-organic framework (MOF) composite as cathode catalyst with Zn foil anode for aqueous rechargeable Zn-CO2 battery. The C-BN@600 catalyst demonstrate a remarkable activity towards electrochemical CO2 reduction to methanol with a Faradaic efficiency of 74% and a Yield rate of 2665 mu g h-1 mg-cat..1 The assembled battery consumes CO2 continuously and electrochemically convert it to methanol during discharge and simultaneously produces electrical energy with a remarkable energy density of 330 Wh kg- 1 and a power density of 5.42 mW cm-2 which is stable for more than 12 days (>300 h, 800 cycles) at 1 mA cm-2, providing a platform to serve a dual purpose of CO2 reduction and energy storage.
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  • Resultat 1-3 av 3

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