Free‐standing Pearl‐chains‐like MoO2 Hierarchical Nanowires with Enhanced Pseudocapacitive Energy Storage

Nanostructure construction is an efficient strategy to achieve high pseudocapacitive behavior with excellent charge storing ability and good cyclability. In this work, we constructed a novel pearl-chains-like MoO2 nanowires (MoO2 PNWs) on nickel foam via a facile solvothermal method. The formation mechanism can be inferred from the oriented growth and self-assembly process under the contribution of benzyl alcohol and sodium dodecyl sulfate (SDS). The MoO2 PNWs deliver a high specific capacitance of 1254 Fg(-1) at 1 Ag-1, outstanding rate performance with 73 % retention from 1 to 20 Ag-1, and 91.5% retention of capacitance after 2000 cycles at 10 Ag-1. The outstanding performance is attributed to the continuous electron conductive path, short ion diffusion length and enlarged electrode-electrolyte interface provided by the pearl chains like hierarchical nanowire, and good electrical conductivity owing to the free-standing structures.