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Figure 1 shows STF35 kchem values obtained from κR and OTR. Both techniques yielded kchem values of similar magnitude and activation energy (2.7 0.1 eV). Additional tests are underway to identify the source of the slight discrepancy observed between the two techniques. However, the similarity of these results is a promising first step in efforts to validate different current-collector-free kchem measurement techniques and eliminate different measurement techniques as a source of the large kchem variation observed for "identical materials" tested under "identical conditions".
Protonic ceramic electrochemical devices (PCEDs) such as fuel cells, electrolysis cells, membrane reactors, and electrochemical hydrogen compressors can operate at low temperatures (300-600oC) because of the low proton transport activation energy, which allows the significant improvement of durability, materials cost, and efficiency of PCEDs. The great effort has been devoted to discovering new component materials for achieving improved cell or stack performance. Parallelly, the manufacturing of the cells and stacks with the desired microstructures should also be paid more attention. In this work, the highly compacted multilayer protonic ceramic fuel cell and electrolysis cell stacks were designed for achieving significant improvement of volumetric power density and substantially decreased the device size, which will be fabricated by a novel laser 3D printing technique. The crack-free layers of dense protonic ceramic electrolyte, dense interconnect, porous hydrogen electrode and porous oxygen electrode were 3D printed and laser sintered, which showed desired microstructures and promising electrochemical properties. The five-layer single cells comprised of two porous electrodes, one dense electrolyte, and two interconnect layers were automatically manufactured through laser 3D printing. The single cells demonstrated promising fuel cell and water electrolysis performance at 600oC.
Non-oxidative dehydrogenation of hydrocarbons (NODHHCs) has drawn increasing interests in recent years due to its great potential to achieve high conversion rate, high selectivity, low energy consumption and low CO2 emission. However, coking and thus degradation issues are currently hindering the commercial demonstration of the NODHHC technology. We here present a single-phase membrane reactor for NODHHC reaction for efficient and selective conversion of hydrocarbons. The membrane is consisted of a mixed electronic and protonic conductor, BaCo0.4Fe0.4Zr0.1Y0.1O3 (BCFZY). The conversion study was carried out in a temperature range of 600-800oC free of catalyst or electrical field. With ethane/steam as a feed gas, a single-pass ethane conversion rate of 70%, ethylene selectivity of 90% and ethylene yield of 67% has been demonstrated by the reactor from 650 to 750oC with a steam/ethane ratio of 1.25. This performance is superior to the benchmark steam cracking technology. Long-term stability test has also shown that there is no significant degradation for more than 100 hours under the selected operating conditions. 2ff7e9595c
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