fig11

Figure 11. (A) Synthesis of SiO₂@phenol-formaldehyde resin (RF), SiO₂@RF@polydopamine (PDA), NHCSs and NHCSs@MnO₂ composites using tetraethoxysilane (TEOS) as Si source. (B) cyclic performance of NHCSs@MnO₂ at 100 mA g^-1 for 200 cycles. Reproduced with permission^[147]. Copyright 2020, Elsevier. (C) 3D structure of CNT conductive networks and fabrication of CMOP cathodes. (D) long-term cycling performance of CMO and CMOP electrodes. Reproduced with permission^[148]. Copyright 2019, Wiley-VCH. (E) synthesis and structural analysis of K-V₂C@MnO₂ and calculated absorption energies for Zn²⁺ on the surfaces of perfect MnO₂-V₂C and δ-MnO₂. Reproduced with permission^[149]. Copyright 2021, American Chemical Society. (F) preparation of MnO₂/PPy nanorod. Reproduced with permission^[150]. Copyright 2020, Elsevier. CNT: carbon nanotube; CMO: CNT/MnO₂; CMOP: CNT/MnO2/PEDOT; NHCS: N-doped hollow carbon sphere; PEDOT: poly(3,4-ethylenedioxythiophene).