Chongchong Wu

Abstract Metal organic frameworks (MOFs) have attracted great interest in photocatalysis, but their activity is hampered by the issue of severe carrier recombination. Here, through a carboxyl group assisted coordination route, MXene decorated with carboxyl groups provides chelation sites enabling coordination with UiO‐66‐NH 2 (Zr/Ti) (UZT) to fabricate a tightly connected UiO‐66‐NH 2 (Zr/Ti)/carboxyl‐functionalized MXene (UZT/CFMX) heterostructure. This is the first instance of direct chemical bonding of MOFs‐involved heterostructure via a coordination bond. The critical role of decorated carboxyl groups can be determined so that 1) these can help to establish a strong coordination bond between two materials; 2) act as bridge to promote the electrons transfer from MOFs to MXene, thus relieving carrier recombination, and 3) most interestingly, the carbon atom on the carboxyl group forms a bond with the oxygen from water stimulating the water to dissociate into OH* and H*, thus adding additional reaction pathways for promoting photocatalytic water splitting. Accordingly, the resulting UZT/CFMX shows efficient solar‐driven photocatalytic performance for water splitting. The H 2 evolution rate is as high as 2187 µmol g −1 h −1 , 20 times higher than that of UZT and 4 times higher than that of UiO‐66‐NH 2 (Zr/Ti)/MXene (UZT/MX), also surpassing the majority of reported MOF‐based photocatalysts.

Heterogeneous molecular catalysts built from β-substituted cobalt porphyrins and carbon nanotubes afford tunable activity for H 2 O 2 synthesis via the two-electron transfer oxygen reduction reaction.