Science and Technology Daily (Correspondent Wu Junhui, Reporter Feng Guowu) Metal-air batteries are known as one of the most promising green energies in the 21st century due to their rich raw materials, high energy density, portability, safety and environmental protection. Looking for cost-effective oxygen Reduction catalyst is a key problem in the development of metal-air batteries, and it is also the "bottleneck" that restricts the wide application of metal-air batteries in electric vehicles and other fields.
At present, the joint research team of Professor Wang Weichao of Nankai University and Professor Yao Yan of the University of Houston has successfully used manganese-based mullite materials as catalysts in magnesium-air batteries. Compared with traditional precious metal catalysts, this material significantly reduces the cost and can be used in It works stably in neutral electrolyte, and its superior catalytic activity also greatly improves the efficiency of magnesium-air batteries. This is the first time that mullite materials have been used in oxygen reduction reactions.
Mullite is a type of ceramic material. Four years ago, Wang Weichao discovered in experiments that manganese-based mullite materials showed excellent catalytic effects in the process of converting nitric oxide into nitrogen oxide. He predicted that when it comes to and Mullite materials may be applicable to oxygen-related catalytic processes. Based on such a bold idea, Wang Weichao found an American company with rich experience in air battery R&D and design. Professor Yao Yan from the University of Houston formed a joint research team. After extensive experiments and theoretical research, they finally successfully applied the manganese-based mullite material as an ORR catalyst for magnesium air batteries for the first time, achieving ORR in a neutral sodium chloride solution. The reaction overpotential reaches 0.78v, which is close to the performance of the precious metal platinum catalyst (0.7v), and the material stability is better than the latter.
The preparation and theoretical performance prediction of manganese-based mullite catalyst were completed by Professor Wang Weichao's research group. Professor Yao Yan's research group realized the design of magnesium air battery using manganese-based mullite catalyst and trial-produced a prototype button battery. The prototype battery The output voltage can drive a red LED light, indicating that the catalyst has good catalytic activity and has huge application potential. The paper resulting from this collaboration has been published online by the internationally renowned academic journal nanoenergy.
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