Pt/C-LiCoO2 composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions
MetadataShow full item record
Oxygen reduction and evolution reactions (ORR and OER) are of prime importance for many energy conversion and storage devices, such as regenerative fuel cells and rechargeable metal–air batteries. However, the sluggish kinetics of the ORR and OER strongly limit the efficiency and performance of these electrochemical systems and jeopardize the route of commercialization. Therefore, the design and development of bifunctional electrocatalysts with high activity for both the ORR and OER is challenging but urgent and crucial. Here, we took advantage of Pt/C and LiCoO2 with outstanding ORR activity and high intrinsic OER activity, respectively, to develop a composite material with ultralow Pt loading as a bifunctional catalyst for the ORR and OER in alkaline media. This catalyst was fabricated via simple ultrasonic mixing, exhibiting superb electrocatalytic activity and good stability. Its ORR activity is comparable to that of the commercial Pt/C catalyst and its OER activity is better than that of single LiCoO2, owing to the synergetic effect between Pt and LiCoO2, which has been demonstrated through the X-ray photoelectron spectroscopy (XPS) characterisation technique. Remarkably, surprisingly high ORR mass activity (2.04 A mgPt−1 at 0.8 V vs. RHE) and enhanced bifunctionality (ΔE = 0.91 V) were obtained for the Pt–LiCoO2 composite catalyst with a mass ratio of 1 : 49 for Pt/LiCoO2. Our work opens up a new track to exploit highly efficient catalysts with reduced consumption of Pt, meanwhile maintaining the optimal catalytic activity and durability.
Showing items related by title, author, creator and subject.
A universal and facile way for the development of superior bifunctional electrocatalysts for oxygen reduction and evolution reactions utilizing the synergistic effectZhu, Y.; Su, Chao; Xu, X.; Zhou, W.; Ran, Ran; Shao, Zongping (2014)Increasing energy demands have stimulated intense research activities on reversible electrochemical conversion and storage systems with high efficiency, low cost, and environmental benignity. It is highly challenging but ...
Efficient and Durable Bifunctional Oxygen Catalysts Based on NiFeO@MnO<inf>x</inf> Core-Shell Structures for Rechargeable Zn-Air BatteriesCheng, Yi; Dou, S.; Veder, Jean-pierre; Wang, S.; Saunders, M.; Jiang, San Ping (2017)© 2017 American Chemical Society.Rechargeable Zn-air battery is limited by the sluggish kinetics and poor durability of the oxygen catalysts. In this Research Article, a new bifunctional oxygen catalyst has been developed ...
A class of transition metal-oxide@MnO<inf>: X</inf> core-shell structured oxygen electrocatalysts for reversible O<inf>2</inf> reduction and evolution reactionsCheng, Yi; Dou, S.; Saunders, M.; Zhang, J.; Pan, J.; Wang, S.; Jiang, S. (2016)© 2016 The Royal Society of Chemistry.It is highly desirable but challenging to develop a highly active as well as durable bifunctional electrocatalyst for the reversible oxygen reduction reaction and evolution reaction ...