Construction of hierarchical sea urchin-like manganese substituted nickel cobaltite@tricobalt tetraoxide core-shell microspheres on nickel foam as binder-free electrodes for high performance supercapacitors

Chenxi Han, Xiqing Xu, Hao Mu, Qiang Tian, Qiang Li, Yitong Liu, Xuan Zhang, Zhenhuan Zhao, Xinghua Su