The Experts below are selected from a list of 82554 Experts worldwide ranked by ideXlab platform
Yong Tang - One of the best experts on this subject based on the ideXlab platform.
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moisturized anode and water Management in a passive vapor feed direct methanol fuel cell operated with neat methanol
Journal of Power Sources, 2015Co-Authors: Zhaochun Zhang, Wei Yuan, Aoyu Wang, Zhiguo Yan, Yong Tang, Kairui TangAbstract:Abstract This paper investigates the moisturized anode and water Management of a vapor-feed direct methanol fuel cell operated with neat methanol. Three methods of water Management are experimentally compared, including water storage in a fuel reservoir, active water vapor supply and water recovery from the cathode to the anode. A water Management Layer for water recovery is introduced to the cathode, which is made of a quasi-superhydrophobic sintered porous metal plate (SPMP) to enhance water back diffusion (WBD). Results prove that each of these methods can improve the cell performance. WBD enhancement based on the use of a SPMP is proven to be the most effective way. It is also found that combination of different methods may more promote the cell performance. Using a WBD enhancement Layer under the condition of active water vapor supply can completely eliminate performance decline in the early stage of constant-load discharging. For fully-passive operation, a higher catalyst loading at the cathode helps retain stable performance when a WBD enhancement Layer is used. Based on this design, the passive vapor-feed DMFC fed with neat methanol can achieve a maximum power density of 21 mW cm −2 .
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passive vapor feed direct methanol fuel cell using sintered porous metals to realize high concentration operation
Applied Energy, 2014Co-Authors: Wei Yuan, Zhaochun Zhang, Jinyi Hu, Bo Zhou, Yong TangAbstract:The use of methanol vapor is helpful to reduce the effect of methanol crossover in a direct methanol fuel cell. This study develops a passive vapor-feed direct methanol fuel cell (VF-DMFC) based on a pervaporation membrane and sintered porous metals which act as functional Layers for effective control of the mass transfer process. The feasibility of using this method is experimentally validated. For the cathode, a sintered porous metal-fiber plate (SPMFP) with great hydrophobicity is used as a water Management Layer to enhance water back diffusion from the cathode to the anode. Results indicate that the use of a SPMFP promotes a higher cell performance especially when a higher methanol concentration is used. The highest peak power density of 19.3mW/cm2 is achieved at an ambient temperature when 12M methanol is supplied. Neat-methanol operation is also viable under this condition. The cathode current collector (CC) with a window-like pattern yields a higher cell performance than the parallel-channel. For the anode, the use of a hydrophilic sintered porous metal-powder plate (SPMPP) embedded in the anode CC reduces the cell performance due to limitation of methanol delivery. This work also reports the influences of methanol concentration and vapor chamber temperature.
Zhaochun Zhang - One of the best experts on this subject based on the ideXlab platform.
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moisturized anode and water Management in a passive vapor feed direct methanol fuel cell operated with neat methanol
Journal of Power Sources, 2015Co-Authors: Zhaochun Zhang, Wei Yuan, Aoyu Wang, Zhiguo Yan, Yong Tang, Kairui TangAbstract:Abstract This paper investigates the moisturized anode and water Management of a vapor-feed direct methanol fuel cell operated with neat methanol. Three methods of water Management are experimentally compared, including water storage in a fuel reservoir, active water vapor supply and water recovery from the cathode to the anode. A water Management Layer for water recovery is introduced to the cathode, which is made of a quasi-superhydrophobic sintered porous metal plate (SPMP) to enhance water back diffusion (WBD). Results prove that each of these methods can improve the cell performance. WBD enhancement based on the use of a SPMP is proven to be the most effective way. It is also found that combination of different methods may more promote the cell performance. Using a WBD enhancement Layer under the condition of active water vapor supply can completely eliminate performance decline in the early stage of constant-load discharging. For fully-passive operation, a higher catalyst loading at the cathode helps retain stable performance when a WBD enhancement Layer is used. Based on this design, the passive vapor-feed DMFC fed with neat methanol can achieve a maximum power density of 21 mW cm −2 .
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passive vapor feed direct methanol fuel cell using sintered porous metals to realize high concentration operation
Applied Energy, 2014Co-Authors: Wei Yuan, Zhaochun Zhang, Jinyi Hu, Bo Zhou, Yong TangAbstract:The use of methanol vapor is helpful to reduce the effect of methanol crossover in a direct methanol fuel cell. This study develops a passive vapor-feed direct methanol fuel cell (VF-DMFC) based on a pervaporation membrane and sintered porous metals which act as functional Layers for effective control of the mass transfer process. The feasibility of using this method is experimentally validated. For the cathode, a sintered porous metal-fiber plate (SPMFP) with great hydrophobicity is used as a water Management Layer to enhance water back diffusion from the cathode to the anode. Results indicate that the use of a SPMFP promotes a higher cell performance especially when a higher methanol concentration is used. The highest peak power density of 19.3mW/cm2 is achieved at an ambient temperature when 12M methanol is supplied. Neat-methanol operation is also viable under this condition. The cathode current collector (CC) with a window-like pattern yields a higher cell performance than the parallel-channel. For the anode, the use of a hydrophilic sintered porous metal-powder plate (SPMPP) embedded in the anode CC reduces the cell performance due to limitation of methanol delivery. This work also reports the influences of methanol concentration and vapor chamber temperature.
Wei Yuan - One of the best experts on this subject based on the ideXlab platform.
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moisturized anode and water Management in a passive vapor feed direct methanol fuel cell operated with neat methanol
Journal of Power Sources, 2015Co-Authors: Zhaochun Zhang, Wei Yuan, Aoyu Wang, Zhiguo Yan, Yong Tang, Kairui TangAbstract:Abstract This paper investigates the moisturized anode and water Management of a vapor-feed direct methanol fuel cell operated with neat methanol. Three methods of water Management are experimentally compared, including water storage in a fuel reservoir, active water vapor supply and water recovery from the cathode to the anode. A water Management Layer for water recovery is introduced to the cathode, which is made of a quasi-superhydrophobic sintered porous metal plate (SPMP) to enhance water back diffusion (WBD). Results prove that each of these methods can improve the cell performance. WBD enhancement based on the use of a SPMP is proven to be the most effective way. It is also found that combination of different methods may more promote the cell performance. Using a WBD enhancement Layer under the condition of active water vapor supply can completely eliminate performance decline in the early stage of constant-load discharging. For fully-passive operation, a higher catalyst loading at the cathode helps retain stable performance when a WBD enhancement Layer is used. Based on this design, the passive vapor-feed DMFC fed with neat methanol can achieve a maximum power density of 21 mW cm −2 .
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passive vapor feed direct methanol fuel cell using sintered porous metals to realize high concentration operation
Applied Energy, 2014Co-Authors: Wei Yuan, Zhaochun Zhang, Jinyi Hu, Bo Zhou, Yong TangAbstract:The use of methanol vapor is helpful to reduce the effect of methanol crossover in a direct methanol fuel cell. This study develops a passive vapor-feed direct methanol fuel cell (VF-DMFC) based on a pervaporation membrane and sintered porous metals which act as functional Layers for effective control of the mass transfer process. The feasibility of using this method is experimentally validated. For the cathode, a sintered porous metal-fiber plate (SPMFP) with great hydrophobicity is used as a water Management Layer to enhance water back diffusion from the cathode to the anode. Results indicate that the use of a SPMFP promotes a higher cell performance especially when a higher methanol concentration is used. The highest peak power density of 19.3mW/cm2 is achieved at an ambient temperature when 12M methanol is supplied. Neat-methanol operation is also viable under this condition. The cathode current collector (CC) with a window-like pattern yields a higher cell performance than the parallel-channel. For the anode, the use of a hydrophilic sintered porous metal-powder plate (SPMPP) embedded in the anode CC reduces the cell performance due to limitation of methanol delivery. This work also reports the influences of methanol concentration and vapor chamber temperature.
Kairui Tang - One of the best experts on this subject based on the ideXlab platform.
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moisturized anode and water Management in a passive vapor feed direct methanol fuel cell operated with neat methanol
Journal of Power Sources, 2015Co-Authors: Zhaochun Zhang, Wei Yuan, Aoyu Wang, Zhiguo Yan, Yong Tang, Kairui TangAbstract:Abstract This paper investigates the moisturized anode and water Management of a vapor-feed direct methanol fuel cell operated with neat methanol. Three methods of water Management are experimentally compared, including water storage in a fuel reservoir, active water vapor supply and water recovery from the cathode to the anode. A water Management Layer for water recovery is introduced to the cathode, which is made of a quasi-superhydrophobic sintered porous metal plate (SPMP) to enhance water back diffusion (WBD). Results prove that each of these methods can improve the cell performance. WBD enhancement based on the use of a SPMP is proven to be the most effective way. It is also found that combination of different methods may more promote the cell performance. Using a WBD enhancement Layer under the condition of active water vapor supply can completely eliminate performance decline in the early stage of constant-load discharging. For fully-passive operation, a higher catalyst loading at the cathode helps retain stable performance when a WBD enhancement Layer is used. Based on this design, the passive vapor-feed DMFC fed with neat methanol can achieve a maximum power density of 21 mW cm −2 .
Ned Djilali - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation on mass transport in a passive vapor fed direct methanol fuel cell operating with neat methanol
Journal of Power Sources, 2020Co-Authors: Haonan Wang, Xun Zhu, Qiang Liao, Rong Chen, Pangchieh Sui, Ned DjilaliAbstract:Abstract A direct methanol fuel cell (DMFC) operating with neat methanol is a promising power candidate for electronic and portable devices because of its high specific energy. But complex mass transport continues to hinder the reliability of such a DMFC. In this work, a two-dimensional isothermal model for a passive vapor-fed DMFC operating with neat methanol is developed to explore the triple-phase (gas, liquid and dissolved phases) mass transport and phase change. The simulation results indicate that the addition of water Management Layer at the cathode effectively facilitates the water recovery to the anode, especially under lower relative humidity condition. The increase of the methanol vapor supply rate alleviates the concentration polarization at high current densities, but the aggravated methanol crossover by an excessive fuel supply decreases the cathode performance. The elevated operating temperature enhances the electrochemical kinetics and mass transport, while excessively high temperature leads to the degradation of the cell performance due to significant water loss. The present work provides an effective theoretical guidance for the design and operation of a passive vapor-fed DMFC operating with neat methanol.
