Towards high-performance all-solid-state asymmetric supercapacitors: A hierarchical doughnut-like Ni3S2@PPy core−shell heterostructure on nickel foam electrode and density functional theory calculations

Jun Ren, Miao Shen, Zhouli Li, Chunming Yang, Yun Liang, Hong‐En Wang, Junhua Li, Neng Li, Dong Qian