Conformal Electrocatalytic Surface Nanoionics for Accelerating High-Temperature Electrochemical Reactions in Solid Oxide Fuel Cells
Conformal Electrocatalytic Surface Nanoionics for Accelerating High-Temperature Electrochemical Reactions in Solid Oxide Fuel Cells
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DOI：
10.1021/acs.nanolett.9b03515
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发表时间：
2019-12-01
期刊：
影响因子：
10.8
通讯作者：
Song, Xueyan
中科院分区：
文献类型：
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作者：
Chen, Yun;Gerdes, Kirk;Song, Xueyan
在多孔阴极的内表面上添加电催化剂对于加速固体氧化物燃料电池（SOFC）中的电化学反应具有很大的希望。在这里，我们利用原子层沉积（ALD）应用双催化剂（Mn0.8Co0.2）（3）O-4和微量的Pt的阴极组成的镧锶锰（LSM）和氧化钇稳定的氧化锆（YSZ）。以最佳ALD层厚度涂覆这种材料导致极化电阻降低53%，并且在750 ℃下SOFC峰值功率密度提高350%。在电化学操作过程中，双催化剂协同相互作用并演变成上层共形电催化（Mn0.8Co0.2）（3）O-4纳米离子，具有高密度晶界和均匀分布在LSM和YSZ上的下层离散纳米Pt颗粒。该构造因此将活性电化学反应位点延伸到阴极的整个内表面。本工作首次在固体氧化物燃料电池领域展示了电催化表面纳米离子的形成及其加速的质量和电荷转移，从而显着提高了电池性能。
Additive implantation of electrocatalysts onto the internal surface of porous cathodes holds great promise to accelerate the electrochemical reactions within solid oxide fuel cells (SOFCs). Here we utilize atomic layer deposition (ALD) to apply dual catalysts with (Mn0.8Co0.2)(3)O-4 and a minute amount of Pt on the cathode consisting of lanthanum strontium manganite (LSM) and yttria-stabilized zirconia (YSZ). Coating this material with optimum ALD layer thickness resulted in a 53% reduction of polarization resistance and a 350% SOFC peak power density enhancement at 750 degrees C. During the electrochemical operations, the dual catalysts interact synergistically and evolve into superjacent conformal electrocatalytic (Mn0.8Co0.2)(3)O-4 nanoionics with high-density grain boundaries and subjacent discrete nano Pt particles evenly distributed on both the LSM and YSZ. The configuration consequently extends the active electrochemical reaction sites to the entire internal surface of the cathode. For the first time in the field of SOFCs, the present work demonstrates the formation of the electrocatalytic surface nanoionics and its resultant accelerated mass and charge transfer to dramatically boost the cell performance.