Mn <sub>0.</sub> <scp> <sub>05</sub> Cd <sub>0</sub> </scp> <sub>.</sub> <scp> <sub>95</sub> S </scp> decorated <scp>MOF</scp> ‐derived <scp> Co <sub>9</sub> S <sub>8</sub> </scp> hollow polyhedron for efficient photocatalytic hydrogen evolution
Peng Su, Hai Liu, Qingxiang Ma, Zhiliang Jin
Abstract
The photocatalytic hydrogen evolution reaction is one of the important ways to convert solar energy into renewable hydrogen. In this work, the Co9S8 hollow polyhedron was formed after sulfidation and calcination with the metal-organic framework ZIF-67. The hollow polyhedron Co9S8 provides abundant support sites for Mn0.05Cd0.95S and effectively reduces the agglomeration degree of Mn0.05Cd0.95S. The Co9S8 hollow polyhedron as the reaction site has a large specific surface area and a mesoporous structure, which is beneficial to the progress of the photocatalytic reaction. A series of tests showed that the introduction of Co9S8 hollow polyhedron significantly improved the light-trapping ability and exposed more reaction sites. Co9S8 hollow polyhedrons are used as electron capture sites, which can effectively collect electrons and induce the interface charge transfer of Mn0.05Cd0.95S to Co9S8. Because the Co9S8-Mn0.05Cd0.95S composite catalyst had a strong light-trapping ability, abundant reaction sites and Co9S8-Mn0.05Cd0.95S heterojunction accelerate the separation and transfer of charges. Therefore, the hydrogen evolution rate of the 10%Co9S8-Mn0.05Cd0.95S composite catalyst was relatively high, which was 13.369 mmol g−1 h−1. In addition, the 10%Co9S8-Mn0.05Cd0.95S composite catalyst still has good hydrogen evolution stability after four cycles. This research may supply a new idea for the preparation of high-efficiency photocatalysts with hollow structures. Novelty Statement The Co9S8 hollow polyhedron provides abundant support sites for M0.05C0.95S particles, which effectively reduces the degree of agglomeration. The Co9S8-M0.05C0.95S heterojunction catalyst not only accelerates the migration and transfer of electrons, but also provides abundant reaction sites. Therefore, the Co9S8-M0.05C0.95S composite catalyst has good catalytic activity.