Abstract
Metal organic frameworks (MOFs) derived Co3O4/ZnO heterostructure has been widely investigated to achieve the high sensing performance. However, the synergistic effects generated from the Co sites and the relationship between the surface structure and sensing performance is still ambiguous. Herein, the hollow Co3O4/ZnO nanocage heterojunctions have been successfully synthesized, and the state of Co sites can be modulated by finely tuning the coordination environment of Co species. Notably, the Co3O4/ZnO-1 materials exhibit superior sensing response (Ra/Rg = 546.2, 32 folds than ZnO sensors) to 5 ppm H2S at 110 °C, with low detection limit (9 ppb), fast recovery (35 s) and high selectivity. Detail structural analysis illustrates O2 can be easily activated around the Co3O4/ZnO hetero-interface, and the formation of O− species with high mobility improves the surface reaction rate. Additionally, the catalytic reaction between highly dispersed Co species and H2S also facilitates the formation of CoS, which can synergistically enlarge the sensing response of sensors. Our work illustrates the state of Co species can greatly affect the sensing performance and pave the way for design of high performance sensing materials.
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