Huang Chen, Huang Liwen, Lin Wen-Feng, Wu Yan
Engineering Research Center of Nano-Geo Materials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, Wuhan 430074, China.
Department of Chemical Engineering, Loughborough University, Loughborough, Leicestershire LE11 3TU, U.K.
ACS Appl Mater Interfaces. 2023 Aug 16;15(32):38965-38974. doi: 10.1021/acsami.3c07484. Epub 2023 Aug 3.
β-AlO has been proven as a fast ionic conductor in solid batteries due to its unique structure. In this work, β-AlO was further modified by LiAlO and employed as the electrolyte material for low-temperature solid oxide fuel cells and electrolyzers, i.e., proton-conducting ceramic fuel cells and electrolysis cells, named as PCFC and PCEC, respectively. At 550 °C, thanks to this superior electrolyte with a remarkable conductivity of 0.161 S·cm, the PCFC reached a high power density up to 1029 mW·cm, and the PCEC demonstrated a significant current density of 1.49 A·cm at a low operation voltage of 2.0 V. It has been found that the introduction of the LiAlO phase into β-AlO reduces the total impedance, while it increases the oxygen vacancy concentration and thus promotes the proton transport process with the reduced activation energy. This work provides a new approach for exploring two-dimensional materials with high-ionic conductivity that can be applied for solid oxide fuel cells and water electrolyzers and more wider power-to-X devices such as electrosynthesis for green ammonia production.
由于其独特的结构，β -AlO已被证明是固体电池中的一种快速离子导体。在这项工作中，β -AlO被LiAlO进一步改性，并用作低温固体氧化物燃料电池和电解槽（即质子传导陶瓷燃料电池和电解槽，分别命名为PCFC和PCEC）的电解质材料。在550℃下，得益于这种具有0.161 S·cm显著电导率的优质电解质，PCFC达到了高达1029 mW·cm的高功率密度，而PCEC在2.0 V的低工作电压下表现出1.49 A·cm的显著电流密度。已发现将LiAlO相引入β -AlO中会降低总阻抗，同时增加氧空位浓度，从而以降低的活化能促进质子传输过程。这项工作为探索具有高离子电导率的二维材料提供了一种新方法，这些材料可应用于固体氧化物燃料电池和水电解槽以及更广泛的功率到X装置，如用于绿色氨生产的电合成。
