NH2-MIL-125(Ti) with transient metal centers via novel electron transfer routes for enhancing photocatalytic NO removal and H2 evolution. Issue 18 (9th August 2021) - Li, Houfan
Abstract : The transient Yb II/III center coordinated with –NH2 of NH2 -MIL-125(Ti) to form a ligand metal charge transfer (LLCMT) pathway, which promoted the rapid transfer of electrons, thereby enhancing photocatalytic NO removal and hydrogen production. Abstract : The bifunctional photocatalyst Yb–NH2 -MIL-125(Ti) synthesized using a simple and convenient method enhanced photocatalytic NO removal and hydrogen production simultaneously, in which the formation of Yb species transient centers anchored on NH2 -MIL-125(Ti) accelerated the transfer and separation rate of charge carriers. The NO removal rate of the optimal sample Yb-NM-6 was 66.3% (the original NH2 -MIL-125(Ti) was only 28.1%), and the hydrogen production was 1883.7993 μmol g −1 (the original NH2 -MIL-125(Ti) had almost no effect). A series of comparative experiments, in particular cyclic voltammogram tests, showed that the transient Yb II/III centers were obtained through a non-traditional ligand to linker metal charge transfer (LLMCT) pathway, which was very different from the traditional ligand metal charge transfer (LMCT) pathway, so as to form a novel charge transfer channel to improve photocatalytic performance. This work details a feasible avenue by which to obtain a novel LLMCT pathway through introducing various metal ions anchored on metal–organic frameworks as efficient transient centers to further improve photocatalytic performance.