CoFe 2 O 4 nanoparticles as efficient bifunctional catalysts applied in Zn-air battery
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g Shen China National Nuclear Corporation Lanzhou Uranium Enrichment Co. Ltd., Manage and Plan Department, Lanzhou 730000, People’s Republic of China
Yuxuan Li, Min Lu, Ke Sun, and Pinxian Xia) State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China (Received 2 August 2017; accepted 19 September 2017)
The transition metal compound catalysts have been taken a great part in renewable energy conversion and storage systems. Herein, we report the uniform CoFe2O4 nanoparticles with abundant oxygen vacancies and specific active surface exposed through the simple hydrothermal reaction for improving the electrocatalytic performance and stability. They show good electrocatalytic performance for hydrogen evolution reaction in 0.5 M H2SO4 with an onset potential of 20 mV, the overpotential of 45 mV (at j 5 10 mA/cm2), and remarkable long-term stability more than 100 h at different current densities and better oxygen reduction reaction activity with lower overpotential in 0.1 M KOH. Moreover, the home-made primary Zn–air batteries, using CoFe2O4 nanoparticles as an air–cathode display the high open-circuit voltage of 1.47 V and the maximum power density of 142 mW/cm2. The two-series-connected batteries fabricated by CoFe2O4 nanoparticles can support a light-emitting diode to work for more than 48 h.
I. INTRODUCTION
Hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) are of great interest due to their important roles in renewable energy conversion and storage systems.1–3 High-performance of HER and ORR is limited due to the activity of the catalysts.4–6 Traditionally, precious metals (e.g., platinum) are efficient for HER and ORR with both activity and stability.7–9 However, their high cost and scarcity have hindered their large-scale application.10–13 What is more, the design of an ideal electrocatalyst that can drive both HER and ORR with high current density at low overpotential and longterm stability is still a challenge.14–16 To address these challenging issues, many efforts have been focused on non-precious-metal–based materials such as perovskite, metallic oxide, and their derivatives as bifunctional electrocatalysts,15–20 as exploring strategies to develop more efficient and stable catalysts in a cost-effective manner is still a technological task in the development of energy conversion and storage systems. Contributing Editor: Chuan Zhao a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2017.404
The development of energy conversion and storage systems take an important part in daily life because of the energy crisis and ecological environment pollution. Metal–air batteries as potential alternative energy sources have been the subject of intense investigation in recent years.21–25 Theoretically, Zn–air batteries, as one of most widespread metal–air batteries, have high energy
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