Bing Li1, Jianwei Chai1, Xiaoming Ge1, Tao An1, Poh Chong Lim1, Zhaolin Liu1, Yun Zong1
1Institute of Materials Research and Engineering (IMRE), A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore
Tóm tắt
AbstractSheet‐on‐sheet hierarchical composites, MnO2 nanosheets on a microsheet of activated eggplant carbon (AEPC), are synthesized by reducing KMnO4 in its aqueous solution in the presence of AEPC at room temperature followed by thermal annealing in air at 200 °C. This composite, namely AEPC@MnO2, shows enhanced catalytic activity towards oxygen reduction reaction in alkaline electrolyte with high durability. Zn‐air batteries using AEPC@MnO2 as a catalyst in the cathode are found to deliver high discharge voltage and survive long‐term cycling. The sheet‐on‐sheet hierarchical composite with high surface area also equips Zn‐MnO2 batteries with high capacity, high rate capability, high coulombic efficiency and decent cycling stability. The simple preparation and versatile functions make AEPC@MnO2 a promising candidate for electrode materials for a range of practical applications.
