Probing multiple Nanocatalysts with various Coherent Diffraction Imaging techniques in Bragg condition

Platinum group metal (PGM) particles are widely used as catalysts in a variety of relevant (electro)catalytic processes. Bragg Coherent Diffraction Imaging (BCDI) is particularly well suited to study strain during catalytic reactions. However, it suffers from two drawbacks: (i) BCDI-probed crystals are typically 10 to 100 orders of magnitude larger than those used commercially, (ii) BCDI studies lack statistical data and often focus on very few crystals. The use of poly-particle BCDI (ppBCDI) and Bragg Ptychography (BP) to map areas containing multiple Pt and Pd nanocatalysts would allow both issues to be addressed and ultimately validate that both techniques, including their data treatments, lead to comparable results.

铂族金属（Platinum group metal, PGM）颗粒作为催化剂，被广泛应用于各类相关（电）催化过程中。布拉格相干衍射成像（Bragg Coherent Diffraction Imaging, BCDI）尤其适用于研究催化反应过程中的晶格应变。不过该技术存在两处局限：其一，BCDI所探测的晶体尺寸通常较工业商用晶体大10至100个数量级；其二，BCDI相关研究缺乏统计数据支撑，且往往仅聚焦于极少量晶体。采用多颗粒布拉格相干衍射成像（poly-particle BCDI, ppBCDI）与布拉格叠层成像（Bragg Ptychography, BP）对包含多个铂（Pt）与钯（Pd）纳米催化剂的区域进行测绘，可同时解决上述两大问题，并最终验证这两种技术（包括其数据处理流程）能够得到可比的实验结果。