Enhancing performance of molybdenum doped strontium ferrite electrode by surface modification through Ni infiltration
Enhancing performance of molybdenum doped strontium ferrite electrode by surface modification through Ni infiltration
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DOI：
10.1016/j.ijhydene.2020.12.185
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发表时间：
2021-02-26
影响因子：
7.2
通讯作者：
Liu, Tong
中科院分区：
文献类型：
--
作者：
Xu, Jiahui;Wan, Shuaibin;Liu, Tong
钼掺杂锶铁氧体Sr2Fe1.5O0.5O6（SFM）是一种很有前途的钙钛矿型固体氧化物电池（SOC）氢电极材料，但通常存在电催化活性不足的问题。本文将具有高电催化性能的Ni纳米粒子渗透到SFM支架中，形成具有高电催化活性的Ni-SFM电极，用于发电和CO2电还原。系统地研究了预烧结温度和Ni负载量对Ni-SFM电极极化电阻的影响。裸SFM电极的R（p）s随预烧温度显著变化，并且在1050 ℃预烧的裸SFM电极获得1.04 Ω cm（2）的最低R-p值。此外，在Ni渗透之后，在800 ℃下实现了0.32 Ω cm（2）的显著降低的R-p值。此外，还对Ni-SFM电极的三维微观结构进行了数值模拟，并计算了不同Ni含量下电极的几何特性，包括Ni/SFM/气体三相界面长度、Ni/SFM界面面积和Ni表面积，将电极微观结构与电极性能联系起来，揭示了电极性能不仅受三相界面长度的影响，而且受界面面积的影响。电化学性能的提高表明，Ni-SFM电极是一种有前途的高性能氢电极的SOC应用。(C)2020年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
Molybdenum doped strontium ferrite, Sr2Fe1.5O0.5O6 (SFM), is a promising perovskite-type hydrogen electrode material in solid oxide cells (SOCs), but usually suffers from insufficient electro-catalytic activity. Herein, Ni nanoparticles with high electro-catalytic properties have been infiltrated into SFM scaffold to form Ni-SFM electrode with high electrocatalytic activity for power generation and CO2 electro-reduction. Pre-sintering temperature and Ni loading of Ni-SFM electrodes have been systematically investigated to minimize the electrode polarization resistance (R-p). R(p)s of bare SFM electrode vary significantly with pre-sintering temperature, and the lowest R-p value of 1.04 Omega cm(2) is obtained for bare SFM electrode pre-fired at 1050 degrees C. Moreover, a significantly reduced R-p value of 0.32 Omega cm(2) is achieved at 800 degrees C after Ni infiltration. Additionally, three-dimensional microstructure of Ni-SFM electrode is simulated numerically, and geometric properties including Ni/SFM/gas triple-phase-boundaries (TPBs) length, Ni/SFM interfacial area, and Ni surface area are calculated under various Ni loadings to correlate electrode microstructure with electrode performance, revealing that the electrode performance are strongly affected not only by the TPBs but also the interface area. Enhanced electrochemical performance indicate that Ni-SFM electrode is a promising high-performance hydrogen electrode for SOCs application. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.