Liu, P., Ran, J., Xia, B., Xi, S., Gao, D. and Wang, J. 2020. Bifunctional Oxygen Electrocatalyst of Mesoporous Ni/NiO Nanosheets for Flexible Rechargeable Zn–Air Batteries. Nano-Micro Letters. 12, (Mar. 2020), 68. DOI:https://doi.org/10.1007/s40820-020-0406-6.