Co3O4 nanofibers compounded with Pt/C as efficient bifunctional electrocatalysts for rechargeable Zn-air battery.
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| Title: | Co |
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| Authors: | Yang, Weimin1 (AUTHOR) ywm13@163.com, Wang, Xiaoyu2 (AUTHOR), Yan, Yufei2 (AUTHOR), Ding, Xifeng2 (AUTHOR) dingxifeng@njust.edu.cn |
| Source: | Journal of Materials Science: Materials in Electronics. Apr2023, Vol. 34 Issue 10, p1-11. 11p. |
| Abstract: | Exploring efficient bifunctional electrocatalysts is critical for metal-air battery commercialization. Co3O4 produced by electrospinning was combined with Pt/C via ultrasonic vibration in this study. As a bifunctional oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalyst, Co3O4@Pt/C nanofibers were employed. The Co3O4@Pt/C nanofibers with a mass ratio of 1:1 (CP11) show excellent OER activity. It outperforms commercial Pt/C and Co3O4 electrocatalysts with a low overpotential (442 mV) and Tafel slope (71.36 mV dec− 1) at 10 mA cm− 2. With a half-wave potential of 0.74 V and diffusion limiting current density of 4.3 mA cm− 2, CP11 provides exceptional catalytic activity for ORR. The expanded surface area of Co3O4 nanofibers and the unique interaction between the Pt/C and metal oxides may be responsible for the high bifunctional catalytic activity of Co3O4@Pt/C nanofibers. More importantly, the zinc-air battery based on CP11 has a 0.64 V charging-discharging voltage gap and long-term stability. The improved OER/ORR bifunctional performance of Co3O4@Pt/C demonstrates the feasibility of using it in high-power energy storage and conversion devices. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Exploring efficient bifunctional electrocatalysts is critical for metal-air battery commercialization. Co3O4 produced by electrospinning was combined with Pt/C via ultrasonic vibration in this study. As a bifunctional oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) electrocatalyst, Co3O4@Pt/C nanofibers were employed. The Co3O4@Pt/C nanofibers with a mass ratio of 1:1 (CP11) show excellent OER activity. It outperforms commercial Pt/C and Co3O4 electrocatalysts with a low overpotential (442 mV) and Tafel slope (71.36 mV dec− 1) at 10 mA cm− 2. With a half-wave potential of 0.74 V and diffusion limiting current density of 4.3 mA cm− 2, CP11 provides exceptional catalytic activity for ORR. The expanded surface area of Co3O4 nanofibers and the unique interaction between the Pt/C and metal oxides may be responsible for the high bifunctional catalytic activity of Co3O4@Pt/C nanofibers. More importantly, the zinc-air battery based on CP11 has a 0.64 V charging-discharging voltage gap and long-term stability. The improved OER/ORR bifunctional performance of Co3O4@Pt/C demonstrates the feasibility of using it in high-power energy storage and conversion devices. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 09574522 |
| DOI: | 10.1007/s10854-023-10287-z |
