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Research Papers

Optimization of Pt–Ni Alloy Catalysts Synthesized by Potentiostatic Electrodeposition for Cathode in PEMFC

[+] Author and Article Information
Cheng Wang, Ze Lin Chen, An Wen Tao

College of Materials Science and Engineering,
Nanjing Tech University,
#5 Xinmofan Road,
Nanjing 210009, Jiangsu, China

Hua Zhang

College of Materials Science and Engineering,
Nanjing Tech University,
#5 Xinmofan Road,
Nanjing 210009, Jiangsu, China
e-mail: huazhang@njtech.edu.cn

1Corresponding author.

Manuscript received February 5, 2016; final manuscript received August 16, 2016; published online September 8, 2016. Assoc. Editor: William Mustain.

J. Electrochem. En. Conv. Stor. 13(2), 021001 (Sep 08, 2016) (7 pages) Paper No: JEECS-16-1014; doi: 10.1115/1.4034482 History: Received February 05, 2016; Revised August 16, 2016

The development of highly active and low-cost catalysts is a challenge for the application and large-scale commercialization of proton exchange membrane fuel cell (PEMFC). In this study, a series of Pt–Ni alloy catalysts is synthesized by potentiostatic electrodeposition, and the optimum deposition parameters are determined by an orthogonal array experiment. The effect of electrodeposition parameters on the morphology, composition, and electrocatalytic activity for oxygen reduction reaction (ORR) is investigated. The Pt–Ni alloy catalyst prepared with the optimum deposition parameters of −0.35 V versus saturated calomel electrode (SCE), 50 °C for 20 min exhibits the higher ORR activity. Rapid potential cycling dealloying is also employed to modify the morphology of Pt–Ni catalysts, which results in the increase of the electrochemical surface area (ECSA) and the improvement of the ORR electrocatalytic activity. The electrochemical active surface area (ECSA) for the dealloying Pt–Ni catalyst (D-OP-sample) with the grain size of 6.2 nm is 87.0 m2 g−1. The current density and the mass activity for the electrode with D-OP-sample catalyst are 281.5 mA·cm−2 at 0.4 V and 587.9 mA· mgPt1 at 0.6 V, respectively.

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Figures

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Fig. 1

Cyclic voltammograms of Pt–Ni alloy catalysts prepared by electrodepositon in the orthogonal experiment (a) and the comparison of OP-sample with Pt catalyst (b). They were recorded in N2-saturated 0.5 M H2SO4 solution at room temperature on the GC electrode after 5 CVs. Scan rate: 50 mV/s.

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Fig. 2

SEM images of OP-sample (a), the inset is the enlarged photo amplified 50,000 times for OP-sample; D-OP-sample (b); sample-3 (c); D-sample-3 (d); sample-5 (e); D-sample-5 (f); sample-9 (g), and D-sample-9 (h)

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Fig. 3

Polarization curves of the MEAs with Pt–Ni alloy catalysts as a cathode undealloying (a) and dealloying (b)

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Fig. 4

Rotating-disk voltammograms of OP-sample in O2-saturated 0.5 M H2SO4 solution with a sweep rate of 5 mV s−1 (a). Koutecky–Levich plots of OP-sample (b).

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Fig. 5

XRD patterns of Pt–Ni alloy catalyst (OP-sample) before and after dealloying

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Fig. 6

HR-TEM micrographs of D-OP-sample with (a) low and (b) high magnification. (c) The lattice fringes in Pt–Ni (111) plane.

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Fig. 7

Long-term cyclic voltammograms of the D-OP-sample catalyst. It was recorded in N2-saturated 0.5 M H2SO4 solution at room temperature on the GC electrode. Scan rate: 30 mV/s.

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