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, p. 68. doi: 10.1007/s40820-020-0406-6.