Inkjet Printing Infiltration of the Doped Ceria Interlayer in Commercial Anode-Supported SOFCs.

Single-step inkjet printing infiltration with doped ceria Ce0.9Ye0.1O1.95 (YDC) and cobalt oxide (CoxOy) precursor inks was performed in order to modify the properties of the doped ceria interlayer in commercial (50 × 50 × 0.5 mm3 size) anode-supported SOFCs. The penetration of the inks throughout the La0.8Sr0.2Co0.5Fe0.5O3-δ porous cathode to the Gd0.1Ce0.9O2 (GDC) interlayer was achieved by optimisation of the inks' rheology jetting parameters. The low-temperature calcination (750 °C) resulted in densification of the Gd-doped ceria porous interlayer as well as decoration of the cathode scaffold with nanoparticles (~20-50 nm in size). The I-V testing in pure hydrogen showed a maximum power density gain of ~20% at 700 °C and ~97% at 800 °C for the infiltrated cells. The latter effect was largely assigned to the improvement in the interfacial Ohmic resistance due to the densification of the interlayer. The EIS study of the polarisation losses of the reference and infiltrated cells revealed a reduction in the activation polarisations losses at 700 °C due to the nano-decoration of the La0.8Sr0.2Co0.5Fe0.5O3-δ scaffold surface. Such was not the case at 800 °C, where the drop in Ohmic losses was dominant. This work demonstrated that single-step inkjet printing infiltration, a non-disruptive, low-cost technique, can produce significant and scalable performance enhancements in commercial anode-supported SOFCs

Opracowanie technologii wytwarzania stałotlenkowych ogniw paliwowych praca doktorska /

Tyt. z ekranu tytułowego.Praca doktorska. Akademia Górniczo-Hutnicza im. Stanisława Staszica (Kraków), 2008.Zawiera bibliogr.Dostępna także w wersji drukowanej.Tryb dostępu: Internet.Rodzaje ogniw paliwowych, ogniwa paliwowe z elektrolitem polimerowym PEFC, zasada działania ogniwa paliwowego, alkaliczne ogniwa paliwowe AFC, zalety, wady, ogniwa paliwowe z kwasem fosforowym PAFC, z elektrolitem ze stopionych węglanów MCFC, stałotlenkowe ogniwa paliwowe SOFC, konstrukcja stałotlenkowego ogniwa paliwowego, o geometrii rurowej, płaskiej, komponenty, ich wymagania, materiały elektrolitowe, anodowe, katodowe, metody wytwarzania planarnych stało tlenkowych ogniw paliwowych, charakterystyka stosowanych materiałów, technologia wytwarzania na saporcie elektrolitowym, otrzymywanie elektrolitu stałego, technologia odlewania folii ceramicznej, przygotowanie zawiesiny, skład, sposób przygotowania, odpowietrzanie, odlewanie, suszenie, cięcie, otrzymywanie płytek z Al2O3, wypalanie, opracowanie metody uzyskiwania elektrod, wykonanie anody, przygotowanie mieszaniny proszków na warstwę anodową przejściową, funkcjonalną, przygotowanie nośnika zawiesiny, pasty, nałożenie warstwy anodowej przejściowej, funkcjonalnej, przygotowanie pasty na warstwę anodową kontaktową, nałożenie warstwy anodowej kontaktowej, wykonanie katody, przygotowanie mieszaniny proszków na warstwę katodową funkcjonalną, charakterystyka otrzymanych przegród ogniw paliwowych na saporcie elektrolitowym, wykonanie elektrolitów opartych na TZ-3Y o wymiarach 100x100mm, grubości około 130μm, technologia wytwarzania stałotlenkowych ogniw paliwowych na saporcie anodowym, opracowanie technologii wytwarzania saportu anodowego, opracowanie metody nanoszenia warstw elektrolitu, technologia odlewania wielowarstwowego, wspólnego wypalania, otrzymywania cienkiego elektrolitu na porowatym podłożu anodowym, charakterystyki prądowo napięciowe ogniwa ASC, pomiary metodą elektrochemicznej spektroskopii impedancyjnej elementów ogniwa, wykresy impedancyjne, układy zastępcze, równoważne, przygotowanie próbek, metodyka, wyniki pomiarów elektrolitów stałych, wykresy impedancyjne elektrolitu ZrO2 3 % mol Y2O3, elektrolit ZrO2 8 % mol Y2O3, wyniki pomiarów układu TZ-3Y-elektroda, TZ-8Y-elektroda, parametrów pojemnościowych, zależności przewodnictwa elektrycznego od temperatur

Power sources involving ~ 300W PEMFC fuel cell stacks cooled by different media

Two constructions of ~300W PEMFC stacks, cooled by different media, were analysed. An open-cathode ~300W PEMFC stack cooled by air (Horizon, Singapore) and a PEMFC F-42 stack cooled by a liquid medium (Schunk, Germany) were chosen for all of the investigations described in this paper. The potential for the design and construction of power sources involving fuel cells, as well as of a hybrid system (fuel cell-lithium battery) for mobile and stationary applications, is presented and discussed. The impact of certain experimental parameters on PEMFC stack performance is analysed and discussed

Inkjet printing and inkjet infiltration of functional coatings for SOFCs fabrication

Inkjet printing fabrication and modification of electrodes and electrolytes of SOFCs were studied. Electromagnetic print-heads were utilized to reproducibly dispense droplets of inks at rates of several kHz on demand. Printing parameters including pressure, nozzle opening time and drop spreading were studied in order to optimize the inks jetting and delivery. Scanning electron microscopy revealed highly conformal ~ 6-10 μm thick dense electrolyte layers routinely produced on cermet and metal porous supports. Open circuit voltages ranging from 0.95 to 1.01 V, and a maximum power density of ~180 mW.cm−2 were measured at 750 °C on Ni-8YSZ/YSZ/LSM single cell 50×50 mm in size. The effect of anode and cathode microstructures on the electrochemical performance was investigated. Two - step fabrication of the electrodes using inkjet printing infiltration was implemented. In the first step the porous electrode scaffold was created printing suspension composite inks. During the second step inkjet printing infiltration was utilized for controllable loading of active elements and a formation of nano-grid decorations on the scaffolds radically reducing the activation polarization losses of both electrodes. Symmetrical cells of both types were characterized by impedance spectroscopy in order to reveal the relation between the microstructure and the electrochemical performance

Power sources involving ~ 300W PEMFC fuel cell stacks cooled by different media

Two constructions of ~300W PEMFC stacks, cooled by different media, were analysed. An open-cathode ~300W PEMFC stack cooled by air (Horizon, Singapore) and a PEMFC F-42 stack cooled by a liquid medium (Schunk, Germany) were chosen for all of the investigations described in this paper. The potential for the design and construction of power sources involving fuel cells, as well as of a hybrid system (fuel cell-lithium battery) for mobile and stationary applications, is presented and discussed. The impact of certain experimental parameters on PEMFC stack performance is analysed and discussed

Characterization of a circular 80 mm anode supported solid oxide fuel cell (AS-SOFC) with anode support produced using high-pressure injection molding (HPIM)

The current study was oriented at analyzing the performance of an anode-supported solid oxide fuel cell produced using high-pressure injection molding. The cell with a total thickness of 550 μm was produced in the Ceramic Department (CEREL) of the Institute of Power Engineering in Poland and experimentally analyzed in the Energy Department (DENERG) of Politecnico di Torino in Italy. The high-pressure injection molding technique was applied to produce a 500 μm thick anode support NiO/8YSZ 66/34 wt% with porosity of 25 vol%. The screen printing method was used to print a 3 μm thick NiO anode contact layer, 7 μm thick NiO/8YSZ 50/50 wt% anode functional layer, 4 μm thick 8YSZ dense electrolyte, 1.5 μm thick Gd0,1Ce0,9O2 barrier layer and a 30 μm thick La0,6Sr0,4Fe0,8Co0,2O3–δ cathode with porosity 25 vol%. The experimental characterization was done at two temperature levels: 750 and 800 °C under fixed anodic and cathodic flow and compositions. The preliminary studies on the application of high-pressure injection molding are discussed together with the advantages of the technology. The performance of two generations of anode-supported cells is compared with data of reference cells with supports obtained using tape casting

Inkjet printing and inkjet infiltration of functional coatings for SOFCs fabrication

Inkjet printing fabrication and modification of electrodes and electrolytes of SOFCs were studied. Electromagnetic print-heads were utilized to reproducibly dispense droplets of inks at rates of several kHz on demand. Printing parameters including pressure, nozzle opening time and drop spreading were studied in order to optimize the inks jetting and delivery. Scanning electron microscopy revealed highly conformal similar to 6-10 mu m thick dense electrolyte layers routinely produced on cermet and metal porous supports. Open circuit voltages ranging from 0.95 to 1.01 V, and a maximum power density of similar to 180 mW.cm(-2) were measured at 750 degrees C on Ni-8YSZ/YSZ/LSM single cell 50x50 mm in size. The effect of anode and cathode microstructures on the electrochemical performance was investigated. Two - step fabrication of the electrodes using inkjet printing infiltration was implemented. In the first step the porous electrode scaffold was created printing suspension composite inks. During the second step inkjet printing infiltration was utilized for controllable loading of active elements and a formation of nano-grid decorations on the scaffolds radically reducing the activation polarization losses of both electrodes. Symmetrical cells of both types were characterized by impedance spectroscopy in order to reveal the relation between the microstructure and the electrochemical performance

Market learning as a determinant of export marketing competence : a comparison of Australian born global and non-born global firms

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