Figure 1: Schematic illustration of the self-sacrifice template synthetic process,

(a) typical wide-angle XRD patterns of the as-obtained NixCoyCO3 (b) and hetero-Ni-Co-S NBs (c) products.

(a) typical wide-angle XRD patterns of the as-obtained NixCoyCO3 (b) and hetero-Ni-Co-S NBs (c) products.