School of Materials Science and Engineering, Center for Innovative Fuel Cell and Battery Technologies, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332-0245, USA.
Phys Chem Chem Phys. 2015 Sep 7;17(33):21112-9. doi: 10.1039/c4cp05176a. Epub 2015 Jan 19.
Thermally robust and chemically inert Ag@SiO2 nanoprobes are employed to provide the surface enhanced Raman scattering (SERS) effect for an in situ/operando study of the early stage of carbon deposition on nickel-based solid oxide fuel cell (SOFC) anodes. The enhanced sensitivity to carbon enables the detection of different stages of coking, offering insights into intrinsic coking tolerance of material surfaces. Application of a thin coating of gadolinium doped ceria (GDC) enhances the resistance to coking of nickel surfaces. The electrochemically active Ni-YSZ interface appears to be more active for hydrocarbon reforming, resulting in the accumulation of different hydrocarbon molecules, which can be readily removed upon the application of an anodic current. Operando SERS is a powerful tool for the mechanistic study of coking in SOFC systems. It is also applicable to the study of other catalytic and electrochemical processes in a wide range of conditions.
采用热稳定性强、化学惰性的 Ag@SiO2 纳米探针为镍基固体氧化物燃料电池 (SOFC) 阳极上碳沉积的早期阶段提供表面增强拉曼散射 (SERS) 效应的原位/现场研究。对碳的增强敏感性使不同阶段的结焦情况得以检测，深入了解材料表面的固有抗焦性。涂覆一层薄的掺钆氧化铈 (GDC) 可以提高镍表面的抗结焦性。电化学活性的 Ni-YSZ 界面似乎对烃类重整更为活跃，导致不同烃类分子的积累，而施加阳极电流即可轻易去除这些分子。现场 SERS 是研究 SOFC 系统中结焦机理的有力工具。它也适用于在广泛的条件下研究其他催化和电化学过程。
