Ultra-low Pt Loading Cathodic Catalyst Layer Prepared on Textured Gas Diffusion Layer by Magnetron Sputtering Method for Hydrogen-oxygen Fuel Cells†

doi:10.7503/cjcu20180491

Abstract

Abstract:

Ultra-low loading of Pt was deposited on the textured gas diffusion layer(GDL) by magnetron sputtering method to prepare cathodic catalyst layer for hydrogen-oxygen proton exchange membrane fuel cells(PEMFCs). The characterization of GDL before and after Pt-loading was carried out using scanning electron microscope(SEM), profilometer and X-ray diffractometer(XRD). The chemical states of sputter deposited Pt were investigated by X-ray photoelectron spectroscopy(XPS). The performance of membrane electrode asembly(MEA) was tested by fuel cell station. The results showed that the Pt deposited on the GDL was controllable and evenly distributed. The surface area of Pt deposited on the textured GDL was larger than that deposited on the commercial GDL. The fuel cell performance indicated that the Pt deposited on the textured GDL with the loading of 0.04 mg/cm² exhibited the maximum mass specific power of 26.25 kW/g Pt, which was higher than that of the Pt deposited on the commercial GDL(17.76 kW/g Pt). In addition, the maximum mass specific power of commercial Pt/C was 24.00 kW/g Pt.

Key words: Magnetron sputtering, Hydrogenoxygen proton exchange membrane fuel cell(PEMFC), Ultra-low Pt loading: Textured gas diffusion layer(T-GDL)

CLC Number:

O646

TrendMD:

LIU Jiaming,FU Kailin,ZHANG Ze,GUO Wei,PAN Mu. Ultra-low Pt Loading Cathodic Catalyst Layer Prepared on Textured Gas Diffusion Layer by Magnetron Sputtering Method for Hydrogen-oxygen Fuel Cells^†[J]. Chem. J. Chinese Universities, 2019, 40(3): 542.

Figures/Tables 7

Fig.1 Flow chart of sputter Pt on the GDL surface

Fig.2 SEM images before and after sputtering Pt on GDL surface(A), (B) C-GDL; (C) C-GDL-200 s; (D) C-GDL-1200 s; (E), (F) T-GDL; (G) T-GDL-200 s; (H)T-GDL-1200 s.

Fig.3 Profiler images of C-GDL(A) and T-GDL(B) surfaces

Fig.4 SEM images(A1—D1) and Pt element distribution maps(A2—D2) of GDL section (A1, A2) C-GDL-200 s; (B1, B2) C-GDL-1200 s; (C1, C2) T-GDL-200 s; (D1, D2) T-GDL-1200 s.

Fig.5 XRD patterns of Pt sputtered on GDL surface

Fig.6 XPS spectra of Pt sputtered on FGDL surface

Fig.7 I-V curves(A, C) and power density curves(B, D) of 0.04 mg/cm2 Pt loading(A, B) and 0.24 mg/cm2 Pt loading(C, D) GDL

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