New Progress in Bifunctional Oxygen Catalysts for Lithium-Oxygen Batteries
Date : 2023-07-01
In recent days, the team of researchers from Wu Zhongryon, the Dalian Institute of Chemical Physics, Catalysing the Basic National Priority Laboratory for Material Chemistry and Energy Applications (Group 508) of the Chinese Academy of Sciences, in collaboration with the letter-and-scientific team, has made further progress in developing efficient and stable double-functional oxygen catalysts, using space-limited effects that have resulted in the accumulation of advanced oxygen reduction (ORR) catalysts Pt and OER catalysts RuO2 (Pt/RuO2/G) from the surface of graphite, successfully achieving excellent OER/ORR and lithium oxygen battery performance.
Lithium oxygen batteries are of great concern because of their sustainability, their environmentality and their super-high theoretical energy density of up to 3,500 Wh kg-1. However, lithium oxygen batteries continue to face challenging bottlenecks such as suboptimal levels, low multiplier capacity and limited recyclability, with limited commercial development. The exploration of high-activity, stable and commercialized double-function oxygen catalysts is therefore key to improving the performance of lithium batteries, and it is important to rationalize the construction of double-function catalysts for different activity-points and to improve the co-benefit of lithium oxygen batteries.
In this work, the team developed a two-dimensional, two-dimensional, two-dimensional Pt/RuO2/G electric catalyst with remarkable activity and durability. The acquired Pt/RuO2/G has excellent dual-function oxygen catalytic activity, and OER/ORR power variance E is only 0.633 V; lithium is constructed as a positive catalyst. Oxygen batteries achieved more than 220 (over 2,200 hours) recyclable performances. Theoretical calculations indicate that increased conductivity and reduced adsorption to reaction intermediates in Pt/RuO2/G lithium-based batteries result in lower chargeable voltage and long-term recyclability of batteries. In high performance lithium battery studies, this strategy of building two-dimensional ultra-minus composite nanopolymers will provide new ideas for the rational design of high activity and durable dual-function electrical catalysts.
The results of the study are “Spatially Confined Subnanometer Pt in RuO2 Nanosheet as Robust Bifunctional Oxygen Electrocatalyst for Stabilizing Li-O2 Batteries, published recently on Chemical Catalysis. These efforts are financed by projects such as the National Fund for Natural Sciences and the China Academy of Sciences Cooperative Institute for Cleaner Energy Innovation. (Turn/True Lee)
Link to article: https://doi.org/10.1016/j.chem.2023.100658