P01706形態科学第２研究室20171003 Morphological analysis of ionomer and catalysis in PEFC’s Cathode High detection efficiency SEM-EDX analysis of ionomer in Cathode Distribution of cathode component and segregation of elements greatly influence the fuell cell battery performance. Slight differences between samples can be evaluated by FE-SEM （ Field Emission Scanning Electron Microscope），SEM-EDX（ Scanning Electron Microscope –Energy Dispersive X-ray spectroscopy），and FE-EPMA（Field Emission Electron Probe Micro Analyzer ）. Low damaged analysis by high detection efficiency EDX enabled to analysis exactly distribution of F which becomes the index of ionomer. In high magnification analysis that high electron beam is irradiated , distribution of F can be caught clearly without change in quality and transformation. Cathode Pt particle aggregation High resolution SEM-EDX analysis of ionomer/catalysis by using thinned specimen BSE F Pt m m m PEM Cathode ■Ionomer segregates at the surface of Cathode. ■There are many Pt aggregation which size is about 10 numbers nm in segregated area of ionomer.. More correct distribution of ionomer/catalysis with little information of depth by using thinned specimen is enabled to evaluate. Cathode C Cathode D ■Ionomer in Cathode C is not segregated, otherwise that in Cathode D is segregated. SEM F SEM F m m m ■It becomes clear by FE-SEM that there are a lot of thread-formed ionomer in Cathode A and big catalysis particle in Cathode B. FE-SEM and FE-EPMA analysis of cathode Morphology of ionomer/carbon and density distribution of Pt is able to confirmed. nm Cathode A Cathode B nm Cathode A Cathode B ■It is revealed that thickness of electrode decreases and Pt is concentrated in Cathode B by FE-EPMA.. % SEM m m m

Morphological analysis of ionomerand catalysis in PEFC’s

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Page 1: Morphological analysis of ionomerand catalysis in PEFC’s

P01706形態科学第２研究室20171003

Morphological analysis of ionomer and catalysis in PEFC’s Cathode

High detection efficiency SEM-EDX analysis of ionomer in Cathode

Distribution of cathode component and segregation of elements greatly influence the fuell cell battery performance. Slight differences between samples can be evaluated by FE-SEM （ Field Emission Scanning Electron Microscope），SEM-EDX（ Scanning Electron Microscope –Energy Dispersive X-ray spectroscopy），and FE-EPMA（Field Emission Electron Probe Micro Analyzer ）.

Low damaged analysis by high detection efficiency EDX enabled to analysis exactly distribution of F which becomes the index of ionomer. In high magnification analysis that high electron beam is irradiated , distribution of F can be caught clearly without changein quality and transformation.

CathodePt particle aggregation

High resolution SEM-EDX analysis of ionomer/catalysis by using thinned specimen

BSE F Ptm m m

PEM

Cathode

■Ionomer segregates at the surface of Cathode.■There are many Pt aggregation which size is about 10 numbers nm in segregated area of ionomer..

More correct distribution of ionomer/catalysis with little information of depth by using thinned specimen is enabled to evaluate.

Cathode C Cathode D

■Ionomer in Cathode C is not segregated, otherwise that in Cathode D is segregated.SEM F

SEM Fm m

■It becomes clear by FE-SEM that there are a lot of thread-formed ionomerin Cathode A and big catalysis particle in Cathode B.

FE-SEM and FE-EPMA analysis of cathode