ORCID Profile
0000-0003-1418-6830
Current Organisation
Deakin University
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Publisher: Elsevier BV
Date: 10-2023
Publisher: Elsevier BV
Date: 2023
Publisher: American Astronomical Society
Date: 30-09-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2CP01149B
Abstract: Revealing the molecular-level interactions and dynamics of the Co 2+/3+ (bpy) 3 (NTf 2 ) 2/3 redox electrolyte system, which is promising for thermo-electrochemical devices.
Publisher: Springer Science and Business Media LLC
Date: 08-11-2021
DOI: 10.1038/S41467-021-26813-8
Abstract: Low-grade waste heat is an abundant and underutilised energy source. In this context, thermo-electrochemical cells (i.e., systems able to harvest heat to generate electricity) are being intensively studied to deliver the promises of efficient and cost-effective energy harvesting and electricity generation. However, despite the advances in performance disclosed in recent years, understanding the internal processes occurring within these devices is challenging. In order to shed light on these mechanisms, here we report an operando magnetic resonance imaging approach that can provide quantitative spatial maps of the electrolyte temperature and redox ion concentrations in functioning thermo-electrochemical cells. Time-resolved images are obtained from liquid and gel electrolytes, allowing the observation of the effects of redox reactions and competing mass transfer processes such as thermophoresis and diffusion. We also correlate the physicochemical properties of the system with the device performance via simultaneous electrochemical measurements.
Publisher: The Electrochemical Society
Date: 30-06-2019
DOI: 10.1149/MA2019-04/10/0448
Abstract: Thermo-electrochemical cells are emerging as a promising and efficient method to convert waste heat to electricity. In addition to developing novel redox electrolyte materials to increase the energy densities, it is crucial for future developments to understand the internal chemical and thermodynamical processes happening inside the thermo-electrochemical cell while it is under operating conditions. Although the temperature and concentration distributions between the electrodes and the variations of the convection currents with cell orientation have been modelled mathematically, it has been a challenge to study these internal processes using experimental techniques. Magnetic resonance imaging (MRI) is a non-invasive and well-established diagnosis technique in medical research to investigate physiology, but it also has the capability to study spatial properties of materials, chemical and thermodynamic processes in energy storage devices using different image contrast options including spin density, relaxation time and velocity [1]. The goals of this study are to develop an MRI method to study the internal chemical and thermodynamic processes within a functioning thermo-electrochemical cell, and understanding how these are affected by the electrolyte, the cell geometry and the orientation of the thermal gradient. A cobalt redox couple based electrolyte, which has been shown to be a promising candidate for thermo-electrochemical cells [2], was used for the in-situ experiments inside specialised cells custom built for MRI experiments, and temperature and concentration dependent 1 H nuclear magnetic resonance spin-lattice relaxation time (T 1 ) measurements were used to interpret the 1 H T 1 weighted MRI images of the working cells. References [1] Britton M. M., MRI of chemical reactions and processes, Progress in Nuclear Magnetic Resonance Spectroscopy, 101 (2017) 51-70. [2] Dupont M. F., MacFarlane D. R., Pringle J. M., Thermo-electrochemical cells for waste heat harvesting – progress and perspectives, Chem. Commun., 53 (2017) 6288-6302.
Publisher: Springer Science and Business Media LLC
Date: 04-10-2016
Publisher: Research Square Platform LLC
Date: 21-06-2021
DOI: 10.21203/RS.3.RS-568214/V1
Abstract: Low-grade waste heat is an abundant and underutilised energy source, and the promise of thermo-electrochemical cells to harvest this resource and power applications such as wearable devices and sensors is increasingly being realised. However, despite substantial advances in performance in recent years, understanding the interior processes occurring within these devices remains a challenge. Here we report an operando magnetic resonance imaging (MRI) approach that can provide quantitative spatial maps of electrolyte temperature and redox ion concentrations in functioning thermo-electrochemical cells. Time-resolved images are obtained from liquid and gel electrolytes, allowing the effects of redox reactions and competing mass transfer effects such as thermophoresis and diffusion to be visualised and correlated with the device performance via simultaneous electrochemical measurements. This method offers valuable insights into these devices and will greatly aid their future design and optimisation.
Location: Australia
Location: Sri Lanka
Start Date: 2016
End Date: End date not available
Funder: National Science Foundation of Sri Lanka
View Funded ActivityStart Date: 2015
End Date: 2016
Funder: University of Peradeniya
View Funded ActivityStart Date: 2016
End Date: 2016
Funder: National Science Foundation of Sri Lanka
View Funded Activity