A hollow core-shell structure material NiCo2S4@Ni2P with uniform heterojunction for efficient photocatalytic H2 evolution reaction
A photocatalytic material NiCo2S4@Ni2P with a unique hollow core-shell structure based on hollow spherical NiCo2S4 whose structure is greatly advantageous for the heterogeneous photocatalytic reaction was successfully prepared. The unique hollow core-shell structure forms homogeneous surface heterojunction, which makes the composite photocatalytic material exhibit great photocatalytic HER activity and stability than initial NiCo2S4 in the dye-sensitized system. The photocatalytic HER rate of the optimal photocatalytic material NiCo2S4@Ni2P 10% reached 77.97μmol.h-1 via the optimization of photocatalytic H2 evolution performance. XRD and XPS were used to study the crystal structure and valence state of photocatalytic material, respectively. The morphology and structure were observed by SEM and TEM. CB and VB potentials were derived by combining the empirical formula based on the results of the UV-vis DRS data. Finally, the photocatalytic HER mechanism was researched by photoelectrochemistry and PL tests combined with the above data.