The intensity of these peaks increa

The intensity of these peaks increases in the processed sample. This shows that the coordination solvent molecules can be eliminated and replaced gradually, but its cubic alkane core does not change. Under any circumstances, the parent frames of coordination cluster are detectable under the MS condition and no low nuclear fragments were observed. Furthermore, the XPS show that valence of Ni did not change before and after catalysis (Figs. S12). In addition, through the comparison of SEM of Ni4 on CP before and after catalysis, it was found that the morphology of the samples did not change neither (Figs. S11). The above results suggest that Ni4 has excellent stability for UOR and OER in alkaline media.