Journal ArticleDOI
Power Conversion Efficiency, Electrode Separation, and Overpotential in the Ferricyanide/Ferrocyanide Thermogalvanic Cell
Y. Mua,T. I. Quickenden +1 more
TLDR
In this article, the effect of electrode separation on the power conversion efficiency of a ferricyanide/ferrocyanide thermogalvanic cell containing platinum electrodes was studied at electrode separations up to 150 cm, using the cold-above-hot electrode configuration.Abstract:
Thermogalvanic cells are electrochemical cells in which thermal energy is converted to electrical energy by maintaining the two (usually identical) electrodes at different temperatures. The effect of electrode separation on the power conversion efficiency of a ferricyanide/ferrocyanide thermogalvanic cell containing platinum electrodes was studied at electrode separations up to 150 cm, using the ``cold-above-hot`` electrode configuration. The open-circuit potential difference is almost independent of electrode separation, but the short-circuit current density falls continuously with increasing electrode separation, while the power conversion efficiency increases asymptotically to a plateau value of ca. 0.04% at a separation near 150 cm. This corresponds to an efficiency of ca. 0.6% relative to that of a Carnot engine operating between the temperatures of 293.1 and 313.1 K used in the present study. A separation of 10 cm provides efficiencies which are ca. 83% of the plateau value and is a convenient separation to use if minimal cell volume is required. The power conversion efficiency of the cell was largely limited by ohmic overpotential. Measured exchange current densities showed that activation overpotential has negligible effect on cell current. Mass transport does not limit the cell current because of the beneficial convection caused by the ``cold-above-hot`` electrode configuration.read more
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Journal ArticleDOI
Harvesting Waste Thermal Energy Using a Carbon-Nanotube-Based Thermo-Electrochemical Cell
Renchong Hu,Baratunde A. Cola,Nanda Haram,Joseph N. Barisci,Sergey Lee,Stephanie Stoughton,Gordon G. Wallace,C.O. Too,Michael C. Thomas,Adrian Gestos,Marilou E dela Cruz,John P. Ferraris,Anvar A. Zakhidov,Ray H. Baughman +13 more
TL;DR: Thermocells are demonstrated, in practical configurations, that harvest low-grade thermal energy using relatively inexpensive carbon multiwalled nanotube (MWNT) electrodes that provide high electrochemically accessible surface areas and fast redox-mediated electron transfer, which significantly enhances thermocell current generation capacity and overall efficiency.
Journal ArticleDOI
Thermosensitive crystallization-boosted liquid thermocells for low-grade heat harvesting.
Boyang Yu,Jiangjiang Duan,Hengjiang Cong,Wenke Xie,Rong Liu,Xinyan Zhuang,Hui Wang,Bei Qi,Ming Xu,Zhong Lin Wang,Jun Zhou +10 more
TL;DR: The authors added a component that boosts the concentration gradient by forcing crystallization of the electrolyte at the cold end, and these crystals then melt at the hot end, which boosts efficiency and is a potential method for recovering low-temperature heat.
Journal ArticleDOI
Recent Progress on PEDOT-Based Thermoelectric Materials
TL;DR: The thermoelectric properties of poly(3,4-ethylenedioxythiophene) (PEDOT)-based materials have attracted attention recently because of their remarkable electrical conductivity, power factor, and figure of merit, and the potential applications of polymer thermoeLECTric generators are outlined.
Journal ArticleDOI
Electrical Power From Nanotube and Graphene Electrochemical Thermal Energy Harvesters
Tae June Kang,Tae June Kang,Shaoli Fang,Mikhail E. Kozlov,Carter S. Haines,Na Li,Yong Hyup Kim,Yongsheng Chen,Ray H. Baughman +8 more
TL;DR: In this paper, a comparison of power generation is conducted using various nanocarbon electrodes, including purified singlewalled and multi-walled carbon nanotubes (P-SWNTs and P-MWNTs), unpurified SWNTs, reduced graphene oxide (RGO), and P -SWNT/RGO composite.
Journal ArticleDOI
Carbon nanotube-reduced graphene oxide composites for thermal energy harvesting applications
Mark S. Romano,Na Li,Dennis Antiohos,Joselito M. Razal,Andrew Nattestad,Stephen Beirne,Shaoli Fang,Yongsheng Chen,Rouhollah Jalili,Gordon G. Wallace,Ray H. Baughman,Jun Chen +11 more
TL;DR: By controlling the SWNT-rGO electrode composition and thickness to attain the appropriate porosity and tortuosity, the electroactive surface area is maximized while rapid diffusion of the electrolyte through the electrode is maintained, which results in enhanced thermocell performance.