期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 42, 页码 47564-47573出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c13784
关键词
nanostructured cermets; 3D tomography; coarsening; electrochemical interfaces; microstructure evolution
资金
- Chinese Scholarship Council-Imperial Scholarship
- EPSRC [EP/M014045/1]
- H2FC SUPERGEN [EACPR_P65919]
- EPSRC CDT for the Advanced Characterization of Materials [EP/L015277/1]
- EPSRC [EP/M014045/1] Funding Source: UKRI
Nanostructure engineering is an effective approach to enhance the electrochemical performance of energy devices. While the high surface area of nanoparticles greatly enlarges the density of reaction sites, it often also leads to relatively rapid degradation as the particles tend to coarsen to reduce their high surface energy. Therefore, a nickel/gadolinia-doped-ceria (CGO) cermet electrode is studied, with a novel porous nanostructure consisting of nanoscale Ni (100 nm) and CGO (50 nm) crystallites, cosintered from nanocomposite precursor agglomerate particles. This electrode combines both high performance and excellent durability, with a total area-specific resistance (ASR) of 0.11 Omega cm(2) at 800 degrees C and a stable ASR with up to 170 h ageing in humidified 5% H-2-N-2. Post-test analysis by 3D tomography shows that nickel coarsens and is responsible for the initial increase in ASR. However, the subsequent electrochemical performance is stable because reaction at the double phase boundaries (DPBs) on the surfaces of nanoscale CGO becomes dominant and is resistant to ageing. At this stage, the coarsened Ni network is also stabilized by the surrounding nanostructure. The dominant role of the DPB reaction is supported quantitatively using a continuum model with geometrical parameters obtained from 3D tomography.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据