Preparation and Electrochemical Performance of Polyaniline Film Formed on Acid-activated Stainless Steel 316L†

doi:10.7503/cjcu20160432

Abstract

Abstract:

Ni-Cr enrichment on stainless steel 316L(SS316L) was achieved by adjusting the concentration and distribution of Cr and Ni on the surface of the SS316L substrate through in situ oxidation processes. Aniline monomers were absorbed and polymerized on the surface of modified SS316L, and a polyaniline(PANI)/Ni-Cr enriched SS316L composite was prepared using chronopotentiometry(CP) technique. Under both reducing(anode simulated) and oxidizing(cathode simulated) conditions of proton exchange membrane fuel cell(PEMFC), the results of potentiodynamic test showed that the PANI coating increased the free corrosion potential of the steel by more than 470 and 500 mV, respectively, with a passivation current density more than 2—3 orders of magnitude lower than that of the bare steel. Under the PEMFC environment, the corrosion currents of the anode and cathod of PANI/Ni-Cr enriched SS316L electrode were decreased by 1 and 2 orders of magnitude, and corrosion rates of the anode and cathode were about 6—9 μA/cm² and <5 μA/cm², respectively. Furthermore, the interface contact resistance between the PANI film and carbon paper was reduced by about 250.0 mΩ·cm² at a compaction pressure of 1.4 MPa. Polyaniline/Ni-Cr enriched SS316L bipolar plate was remarkably more stable in simulated PEMFC environments, and more conducting compared to the bare SS316L.

Key words: Ni-Cr modified layer, Proton exchange membrane fuel cell, Stainless steel, Polyaniline, Bipolar plate

TrendMD:

LIU Ming, TIAN Ying, FU Jie, XU Hongfeng. Preparation and Electrochemical Performance of Polyaniline Film Formed on Acid-activated Stainless Steel 316L^†[J]. Chem. J. Chinese Universities, 2016, 37(12): 2228.

Figures/Tables 8

Fig.1 SEM images of the surface of SS316L before(A) and after(B) being activated for 6 h in 0.5 mol/L H2SO4 at 80 ℃.

Fig.2 XRD patterns of SS316L before(A) and after(B) being activated for 6 h in 0.5 mol/L H2SO4 at 80 ℃

Fig.3 EDS spectra and data of SS316L after being activated for 6 h in 0.5 mol/L H2SO4 at 80 ℃

Fig.4 Top-view SEM image of PANI seeds layer(A), top-view(B) and cross-section-view(C) SEM images of PANI coating after secondary growth and the corresponding EDS spectra and data(D, E) (D) Black region in Fig.(B); (E) white sphere region in Fig.(B).

Fig.5 FTIR spectrum of PANI doped with anions derived from oxalic acid

Fig.6 Anodic(A) and cathodic(B) polarization curves for the three samples in 0.5 mol/LH2SO4+5 mg/L F- at 80 ℃ (A) Bubbled with H2, the arrow corresponds to the anode potential in a PEMFC; (B) bubbled with air, the arrow corresponds to the cathode potential in a PEMFC.

Fig.7 Potentiostatic anodic(A) and cathodic(B) polarization curves for untreated SS316L(a) and PANI coated SS316L(b) at -0.1 V(vs. SCE) purged with H2(A) and at 0.6 V(vs. SCE) purged with air(B)

Fig.8 Interfacial contact resistances at different compaction forces a. Untreated SS316L; b. acid activated SS316L; c. PANI coated SS316L.

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