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High Temperature Steam Electrolysis for Efficient Hydrogen Production

高温蒸汽电解高效制氢

基本信息

批准号：
17360335
负责人：
UCHIDA Hiroyuki
金额：
$ 5.31万
依托单位：
University of Yamanashi
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17360335/
关键词：
Steam Electrolysis Solid Oxide Electrolysis Cell Hydrogen Production Ceria Nickel LSCF

项目摘要

Solid oxide electrolysis cells (SOECs) are expected, in principle, to provide the highest efficiency of electrolytic hydrogen production, because the applied voltage can be reduced due to favorable thermodynamic and kinetic conditions. It is desirable, however, to operate SOECs at a reduced temperature for a wide choice of the component materials as well as a utilization of various waste heat sources. The aim of this research project is to develop high performance electrodes for the SOECs operating at medium temperatures. We have obtained the following results.1. Mixed conducting samaria-doped ceria (SDC) cathode with highly dispersed Ni catalysts exhibited very high performance. At 700-900℃, the Ni-dispersed SDC cathode exhibited the highest performance at 17 vol.%-Ni loading, due to the effective enhancement of the reaction rate by increasing the active reaction sites and lowering the electronic resistance.2. The cathode activity was found to increase with an increase in the ionic co … More nductivity of zirconia electrolyte, similar to the case of SOFC electrodes. An SOEC comprised of Ni-dispersed SDC cathode, ScSZ electrolyte, La(Sr)Co03 anode (with SDC interlayer) exhibited high performance for the short term test; 12R-free cell voltage = 1.13 V at 0.5 A/cm2 and 900℃ under the atmosphere of H2O + H2 (P[H20] = 0.6 atm) and 02 (1 atm).3. We have developed double layer-type (catalyst layer/current collecting layer) electrodes. As the H2 catalyst layer (anode for SOFC and cathode for SOEC) interfaced with YSZ solid electrolyte, SDC particles were employed in combination with Ni metal electrocatalysts (10 to 20 vol.% of nanometer-size Ni) highly dispersed on their surfaces. The current collecting porous layer of Ni-SDC cermet (60 vol.% of micrometer-size Ni) was formed on the catalyst layer. The H2-electrode with 10 vol.% Ni in the catalyst layer exhibited high performance, due to the effective enhancement of the reaction rate by increasing both the active reaction sites and the electronic conductance. Lao.6Sr0.4Co0.2Fe0.8O3 (LSCF)/(LSCF+SDC) double layer-type electrode worked well to evolve 02 in an SOEC. It was found that the addition of 40 vol.% SDC in the catalyst layer enhanced the performance effectively. Less

理论上，固体氧化物电解电池（SOECs）有望提供最高的电解制氢效率，因为由于有利的热力学和动力学条件，施加的电压可以降低。然而，为了广泛选择组件材料以及利用各种废热源，在较低的温度下操作soec是可取的。本研究项目的目的是为在中温下工作的soec开发高性能电极。我们得到了以下结果：混合导电钐掺杂铈（SDC）阴极与高度分散的Ni催化剂表现出非常高的性能。在700 ~ 900℃时，ni分散SDC阴极在17 vol.%-Ni负载下表现出最高的性能，这是因为通过增加活性反应位和降低电子电阻有效地提高了反应速率。阴极活性随着离子co的增加而增加，氧化锆电解质的电导率更高，与SOFC电极的情况相似。由ni分散的SDC阴极、ScSZ电解质、La(Sr)Co03阳极（带SDC夹层）组成的SOEC在短期测试中表现出较高的性能；2 .在H2O + H2 （P[H20] = 0.6 atm）和02 （1 atm）气氛下，在0.5 A/cm2和900℃下，无12r电池电压= 1.13 V。我们开发了双层（催化剂层/集电流层）电极。当H2催化剂层（SOFC为阳极，SOEC为阴极）与YSZ固体电解质界面时，SDC颗粒与Ni金属电催化剂（纳米尺寸Ni的10 ~ 20%）结合使用，高度分散在其表面。在催化剂层上形成了Ni- sdc金属陶瓷的集流多孔层（占微米尺寸Ni的60%）。在催化剂层中添加10 vol.% Ni的h2电极表现出优异的性能，这是因为通过增加活性反应位点和电子电导有效地提高了反应速率。Lao.6Sr0.4Co0.2Fe0.8O3 (LSCF)/(LSCF+SDC)双层电极在SOEC中表现良好。结果表明，在催化剂层中添加40 vol.%的SDC能有效地提高催化剂的性能。少