fig1

Figure 1. (A) shows a flow chart of how to prepare M-HHTP; (B-D) are the 100 nm SEM images of NCH1, NCH2 and NCH3, respectively; (E-G) are the 200 nm SEM images of NH, CH and NCH1, respectively; (H-K) are the EDS scans of O, Ni, Co and the three components in the material NCH1, respectively, and (L-O) are the EDS scans of O, Ni, Co and the three components in the material NCH3, respectively. HHTP: Hexahydroxytriphenylene; M-HHTP: metal-hexahydroxytriphenylene (M = Ni, Co); SEM: scanning electron microscopy; NCH1: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 1:3); NCH2: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 3:1); NCH3: nickel-cobalt hybrid material (Ni²⁺:Co²⁺ = 1:1); EDS: energy dispersive X-ray spectroscopy; IPA: isopropanol; NH: nickel-only material; CH: cobalt-only material.