Review on Portable Energy Systems: From Electrochemical Systems to Energy Harvesting

Krewer, Ulrike

doi:10.1002/cite.201100084

Cited by 8 publications

(4 citation statements)

References 67 publications

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“…The capillary pressure (capillary forces), which has been known since 1830, can be mathematically described by the Young-Laplace equation for ideal circular pores Equation (1) and rectangular/square micro channels Equation (2). Detailed information about the capillary force can be found in the supplementary information.…”

Section: Capillary Pressurementioning

confidence: 99%

“…Detailed information about the capillary force can be found in the supplementary information. (2) where σ represents the surface tension, φ the contact angle, and d the characteristic diameter (hydraulic or circular) of the pores of the polymer based membrane. Using Equation 1, the capillary pressure can be calculated indicating the maximum water entry pressure of a porous membrane.…”

Section: Capillary Pressurementioning

confidence: 99%

“…Unfortunately, due to the low energy capacity of conventional electrochemical accumulators e.g., lithium ion batteries, this kind of energy supply or recharging systems (power banks) are no longer appropriate for long operating times. To overcome short operating times, many possibilities are currently being investigated to replace lithium ion battery-based energy supplies or recharging systems [1][2][3]. Small-sized membrane-based fuel cell systems with a highly specific energy density are among the most promising candidates to overcome short operating times.…”

Section: Introductionmentioning

confidence: 99%

“…Using a micro direct methanol fuel cell (µDMFC) based on a lab-on-a-chip (LOC) design, integrated fuel supply for methanol, and a separation system, the operating time can be extended significantly without increasing the weight or volume of the portable device disproportionately. In addition, the µDMFC can be refuelled instantly with methanol, which is an easily storable, convenient liquid fuel with an energy density of 4.42 kWh/dm 3 [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

et al. 2018

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The gas/liquid phase separation of CO2 from a water-methanol solution at the anode side of a µDirect-Methanol-Fuel-Cell (µDMFC) plays a key role in the overall performance of fuel cells. This point is of particular importance if the µDMFC is based on a “Lab-on-a-Chip” design with transient working behaviour, as well as with a recycling and a recovery system for unused fuel. By integrating a membrane-based micro contactor downstream into the µDMFC, the efficient removal of CO2 from a water-methanol solution is possible. In this work, a systematic study of the separation process regarding gas permeability with and without two-phase flow is presented. By considering the µDMFC working behaviour, an improvement of the overall separation performance is pursued. In general, the gas/liquid phase separation is achieved by (1) using a combination of the pressure gradient as a driving force, and (2) capillary forces in the pores of the membrane acting as a transport barrier depending on the nature of it (hydrophilic/hydrophobic). Additionally, the separation efficiency, pressure gradient, orientation, liquid loss, and active membrane area for different feed inlet temperatures and methanol concentrations are investigated to obtain an insight into the separation process at transient working conditions of the µDMFC.

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Section: Capillary Pressurementioning

confidence: 99%

Section: Capillary Pressurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

et al. 2018

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Sensorial Materials

Lehmhus¹,

Bosse²,

Busse³

2013

Structural Materials and Processes in Transportation

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Physikalische Chemie 2011

2012

Nachr Chem

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Die Elektrochemie ist vordergründig als Wissenschaft der Energiespeicherung und ‐wandlung im Gespräch. Diese unzutreffende thematische Verengung trübt allerdings den Blick auf die wissenschaftliche Breite und hohe Interdisziplinarität. Die Lösungs‐NMR‐Spektroskopie ist in neue Bereiche vorgestoßen: Charakterisierung von Megadalton‐großen Systemen sowie die Bestimmung von Struktur und Dynamik gering populierter Konformere, von intrinsisch unstrukturierten Proteinen und Membranproteinen.

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Review on Portable Energy Systems: From Electrochemical Systems to Energy Harvesting

Abstract: Review on Portable Energy Systems: From Electrochemical Systems to Energy HarvestingThis review gives an overview on all portable energy technologies from the point of view of process engineering, compares the technologies and discusses recent and future trends.

Cited by 8 publications

References 67 publications

Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

Experimental Investigation of the Gas/Liquid Phase Separation Using a Membrane-Based Micro Contactor

Sensorial Materials

Physikalische Chemie 2011

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