Metastable Rock Salt Oxide-Mediated Synthesis of High-Density Dual-Protected M@NC for Long-Life Rechargeable Zinc-Air Batteries with Record Power Density
Tang Tang, Wen-Jie Jiang, Xiao-Zhi Liu, Jun Deng, Shuai Niu, Bin Wang, Shi-Feng Jin, Qiang Zhang, Lin Gu, Jin-Song Hu, Li-Jun Wan
Journal of the American Chemical Society | AMER CHEMICAL SOC | Published : 2020
Creating high-density durable bifunctional active sites in an air electrode is essential but still challenging for a long-life rechargeable zinc-air battery with appealing power density. Herein, we discover a general strategy mediated by metastable rock salt oxides for achieving high-density well-defined transition-metal nanocrystals encapsulated in N-doped carbon shells (M@NC) which are anchored on a substrate by a porous carbon network as highly active and durable bifunctional catalytic sites. Small-size (15 ± 5 nm) well-dispersed Co2Fe1@NC in a high density (metal loading up to 54.0 wt %) offers the zinc-air battery a record power density of 423.7 mW cm-2. The dual protection from the com..View full abstract
Awarded by National Key Research and Development Program of China
Awarded by National Natural Science Foundation of China
We acknowledge the financial support from the National Key Research and Development Program of China (2016YFB0101202) and the National Natural Science Foundation of China (21773263 and 91645123). We also thank the following staff scientists at the Center for Analysis and Testing, ICCAS for their help: Dr. Z. J. Zhao and X. Y. Zhang for XPS analysis; Dr. B. Guan and J.-L. Yue for SEM and TEM support, and Y. Sun for in-situ temperaturedependent XRD experiments.