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首页> 外文会议>International symposium on solid oxide fuel cells;SOFC-XII >Development of Highly Robust, Volume-Manufacturable Metal-Supported SOFCs for Operation Below 600°C
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Development of Highly Robust, Volume-Manufacturable Metal-Supported SOFCs for Operation Below 600°C

机译：开发了高度坚固，可批量制造的金属支撑SOFC，可在600°C以下操作

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Ceres Power has been developing fuel cell stacks and mCHP systems based on its unique metal-supported SOFC design incorporating a gadolinia-doped ceria (CGO) electrolyte operating in the 450-600°C temperature range. The metal supports are low-cost ferritic stainless steel foils which are perforated using a laser to create a porous region for gas diffusion on the anode side, and an impermeable region around the perimeter for sealing. Conventional volume ceramic processing techniques are used for the deposition of the anode, bulk electrolyte, cathode active and cathode current-collector layers, which are all sintered in a non-reducing atmosphere. A proprietary technique has been developed for the deposition of a dense stabilized zirconia layer and a CGO barrier layer between the bulk CGO electrolyte and the cathode active layer, largely blocking the internal short-circuiting currents inherent in the use of ceria-based electrolytes due to the mixed-conductivity of CGO when exposed to an anodic atmosphere. The use of this layer enables close-to-theoretical cell efficiencies to be obtained, whilst still maintaining the advantages of high ionic conductivity and sinterability which make CGO ideal for low-temperature processing and operation. The present generation of cells being manufactured are designed to meet the commercial requirements for a wall mounted, natural gas fuelled mCHP product, producing an average of 140 tnWcm~(-2) at 0.75 V/cell at 570°C and 60% fuel utilization, operating on steam-reformed natural gas. Open-circuit voltages are around 1.10V operating on hydrogenitrogen; close to theoretical values indicating the effective suppression of internal short-circuits. The unique metal supported design facilitates simple and robust hermetic sealing of the cell to the interconnect by welding, and layer-to layer sealing and isolation is achieved using a commercial gasket material, thus largely eliminating degradation due to thermal stress induced seal leakage found in conventional planar SOFC designs. The extreme robustness of the metal foil cell design has been demonstrated by thermally cycling welded cell/interconnect assemblies from 100-600°C (<5 min total cycle time) using an infrared heater and forced air cooling. After 100 cycles, there was no degradation of the gas tightness of the assembly (pressure-decay leak tester). These tested cells were then assembled into a short stack and tested, with electronic performance indistinguishable from a short stack of new cells.
机译：Ceres Power根据其独特的金属支持的SOFC设计（包括掺有氧化ado的二氧化铈（CGO）电解质）在450-600°C的温度范围内工作，一直在开发燃料电池堆和mCHP系统。金属载体是低成本的铁素体不锈钢箔，其使用激光打孔以在阳极侧产生用于气体扩散的多孔区域，并在周边周围形成用于密封的不可渗透区域。常规的体积陶瓷加工技术用于沉积阳极，本体电解质，阴极活性层和阴极集电器层，它们均在非还原性气氛中烧结。已经开发了一种专有技术，用于在块状CGO电解质和阴极活性层之间沉积致密的稳定氧化锆层和CGO阻挡层，从而很大程度上阻止了由于使用二氧化铈基电解质而固有的内部短路电流暴露在阳极气氛中时CGO的混合电导率。通过使用该层，可以获得接近理论的电池效率，同时仍保持高离子电导率和可烧结性的优势，这使CGO非常适合低温处理和操作。正在设计生产的新一代电池，以满足壁挂式天然气供热mCHP产品的商业需求，在570 V和570°C下以0.75 V /电池的平均容量产生140 tnWcm〜（-2），并且燃料利用率为60％ ，使用蒸汽重整天然气。在氢气/氮气下工作的开路电压约为1.10V;接近理论值，表明有效抑制了内部短路。独特的金属支撑设计有助于通过焊接实现电池与互连之间的简单而稳固的气密密封，并且使用商用垫片材料实现层到层的密封和隔离，从而在很大程度上消除了传统上由于热应力引起的密封泄漏所引起的退化平面SOFC设计。金属箔电池设计的极端坚固性已通过使用红外加热器和强制空气冷却在100-600°C（总循环时间<5分钟）内对焊接的电池/互连组件进行热循环来证明。 100次循环后，组件的气密性没有下降（压力衰减泄漏测试仪）。然后将这些测试过的电池组装成一个短电池堆并进行测试，其电子性能与一小堆新电池没有区别。

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