Facile hydrothermal synthesis of 3D flower-like NiCo 2 O 4 /CeO 2 composite as effective oxygen reduction reaction catal
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Facile hydrothermal synthesis of 3D flower‑like NiCo2O4/CeO2 composite as effective oxygen reduction reaction catalyst Jinxing Wang1 · Xiaoyang Dong1 · Jingdong Yang1 · Ling Zhu1 · Wen Zeng1 · Jingfeng Wang1 Received: 29 May 2020 / Accepted: 8 August 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Exploiting high-performance and cost-effective non-noble metal catalysts for oxygen reduction reaction (ORR) is still greatly important for energy storage devices such as metal-air batteries and fuel cells. In this work, CeO2, NiCo2O4, and NiCo2O4/ CeO2 were synthetized by facile hydrothermal method and used as an ORR catalyst. The as-prepared C eO2, NiCo2O4, and NiCo2O4/CeO2 samples were measured by XRD, XPS, SEM, and TEM. Electrochemical characterization tests exhibit that the ORR activity of NiCo2O4 is evidently enhanced by blending with CeO2 nanoparticles. The NiCo2O4/CeO2 composite exhibits more superior electrocatalytic performances and stability in alkaline solution as compared to the pure CeO2 and NiCo2O4. The electrochemical performance of composite is very near to that of 20 wt% Pt/C. Owing to the synergistic interactions, NiCo2O4/CeO2 favors a four-electron pathway in ORR and exhibits a higher ORR activity than C eO2 and NiCo2O4. The outstanding performance confirms the NiCo2O4/CeO2 composite as a promising efficient ORR catalyst in metal-air batteries and fuel cells.
1 Introduction With the rapid development of science and technology, too much fossil resource is consumed and global climate change, energy shortage and environmental pollution caused by the increasing demands for energy have become a serious problem. It is very necessary to develop new clean energy and renewable resource to resolve this problem [1, 2]. To resolve the environmental issues and energy crisis, electrochemical energy conversion devices and storage systems have drawn a great deal of attention over the world [2–5]. Among these energy technologies, metal-air batteries and fuel cells are deemed as one of the most low-carbon economy and sustainable energy devices in the twenty-first century and have been applied in many fields such as transportation and portable power generation [3, 6–9]. However, there are also many challenges impeding their commercialization including high costs and poor durability [10–13]. The major problem lies in the cost of electrocatalysts and sluggish kinetics of ORR at the cathodes [14]. Therefore, effective and high-performing
* Jinxing Wang [email protected] 1
College of Materials Science and Engineering, Chongqing University, Chongqing, China
electrocatalysts should be urgently designed for ORR in practical applications. ORR is a very important electrochemical reaction in the fuel cells and the sluggish dynamic requires a large quantity of precious metals such as Pt to improve reaction activity and durability in the alkaline aqueous solution. However, increasing the loading of Pt enhances the electrochemical performance but also the cost amplifies at t
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