Impact of Heat Treatment on the Oxygen Reduction Reaction Performance of PtCo/C(N) Electrocatalyst in PEM Fuel Cell
Yaqi Cao, Tingting Liu, Zuobo Yang, Hong Zhao +1
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70% confidenceA PtCo/C(N) electrocatalyst prepared by Na2CO3-assisted urea liquid-phase deposition strategy shows improved oxygen reduction reaction performance compared to commercial Pt/C catalyst, with higher output voltage, maximum power density, mass activity, and half-wave potential.
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Abstract
Abstract The synthesis of efficient and stable Pt alloy catalysts is a major challenge for the commercialization of PEMFC. Herein, we report a PtCo/C(N) electrocatalyst prepared by Na 2 CO 3 ‐assisted urea liquid‐phase deposition strategy as an efficient cathodic oxygen reduction reaction electrocatalyst, and test its activity and stability in a rotating disc electrode and a single‐cell. The membrane electrode prepared with PtCo/C(N)‐800 °C catalyst has an output voltage of 0.652 V at 2 A/cm 2 and a maximum power density of 1.501 W/cm 2 , which are 36 mV and 81 W/cm 2 higher than those of commercial Pt/C catalyst, respectively. In addition, the mass activity and half‐wave potential of PtCo/C(N)‐800 °C are 2.44 times and 50 mV higher than those of commercial Pt/C, respectively. After 5000 voltammetric cycles, its mass activity and half‐wave potential only lose 35 A/g Pt and 9 mV, respectively. XPS results show that the binding energy of Pt 4f is positively shifted relative to Pt/C‐TKK, and the d‐band center of Pt decreases, leading to weak chemical interaction between the oxygen‐containing intermediate and the surface of the electrocatalyst, which is conducive to the improvement of the ORR activity and stability of the catalyst.
Key findings
- The PtCo/C(N)-800 °C catalyst has an output voltage of 0.652 V at 2 A/cm², which is 36 mV higher than that of commercial Pt/C catalyst.
- The maximum power density of PtCo/C(N)-800 °C is 1.501 W/cm², which is 81 W/cm² higher than that of commercial Pt/C catalyst.
- After 5000 voltammetric cycles, the mass activity and half-wave potential of PtCo/C(N)-800 °C only lose 35 A/gPt and 9 mV, respectively.
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- ChemElectroChem
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- 2024