Carbon-coated Co 3 O 4 with porosity derived from zeolite imidazole framework-67 as a bi-functional electrocatalyst for
- PDF / 1,396,058 Bytes
- 9 Pages / 547.087 x 737.008 pts Page_size
- 97 Downloads / 211 Views
RESEARCH PAPER
Carbon-coated Co3O4 with porosity derived from zeolite imidazole framework-67 as a bi-functional electrocatalyst for rechargeable zinc air batteries Qing Zhao & XiaoLong Xu & YuHong Jin & QianQian Zhang & JingBing Liu & Hao Wang
Received: 12 April 2020 / Accepted: 22 September 2020 # Springer Nature B.V. 2020
Abstract The electro-catalytic performance of the bifunctional catalysts at the air cathode for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) plays a significant role for the development of rechargeable zinc air batteries (ZABs). To obtain the high-performance electrocatalysts, a series of porous Co3O 4 samples derived from zeolitic imidazolate framework-67 (ZIF-67) are prepared by one-step annealing process at different temperature (350, 450, and 550 °C) under air atmosphere. Compared with the commercial Co3O4, the optimized sample Co3O4 prepared at 450 ° C (CO 3 O 4 /C-450) exhibits the lowest overpotential of 1.68 V and the highest half-wave potential of − 0.56 V because the porosity of as-prepared Co3O4 provides abundant reactive sites. Moreover, the high discharge potential of 1.33 V and long cycle life of more than 100 h at 20 mA cm−2 are achieved in ZABs with CO3O4/C-450 electrocatalyst, which are attributed to the better stability provided by the carbon coating.
Keywords Zeolite imidazole framework-67 . Porosity . Bi-functional electrocatalyst . Zinc air batteries . Nanostructure . Energy storage
Q. Zhao : X. Xu : Y. Jin (*) : Q. Zhang : J. Liu : H. Wang (*) The College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China e-mail: [email protected] e-mail: [email protected]
Introduction Rechargeable zinc air batteries (ZABs) are considered as one of the promising choice for energy storage systems, such as electric vehicles due to its high energy density (1086 Wh kg−1), low cost, and high safety (Li and Dai 2014; Fu et al. 2017; Zeng et al. 2018; Lee et al. 2011). However, the sluggish multi-electron redox processes with the large overpotential at air cathode especially for the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) lead to the poor cyclic stability and unsatisfied power density (Inagum and Nakashima 2013; Xiong and Ivey 2017a). Recently, the noble metal catalysts, such as Pt, Ir, and RuO2, are used in the practical application for ZABs, but their high-cost and scarcity seriously hinder the large-scale commercial application for the ZABs (Li et al. 2015; Liang et al. 2011). Therefore, it is a great challenge to prepare noble-metalfree bi-functional electro-catalysts with high electrochemical catalytic activity for OER and ORR processes in ZABs. Co-based materials are regarded as a candidate to improve OER and ORR performance for ZABs due to their high theoretical energy density (516 Wh kg−1 based on the weight of Co3O4 as a catalyst and zinc anode at a working potential of 1.78 V) (Inaguma and Nakashima 2013; Xiong and Ivey 2017b; Plaisance and van Santen 2015). Song and coworkers (Wang
Data Loading...
