Details

Autor(en) / Beteiligte

• Shi, Litong
• Wu, Chongchong
• Wang, Yang
• Dou, Yuhai
• Yuan, Ding
• Li, Hui
• Huang, Hongwei
• Zhang, Yu
• Gates, Ian D.
• Sun, Xiaodong
• Ma, Tianyi

Titel

Rational Design of Coordination Bond Connected Metal Organic Frameworks/MXene Hybrids for Efficient Solar Water Splitting

Ist Teil von

• Advanced functional materials, 2022-07, Vol.32 (30), p.n/a

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc

Erscheinungsjahr

2022

Quelle

Wiley Online Library

Beschreibungen/Notizen

• 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‐NH2(Zr/Ti) (UZT) to fabricate a tightly connected UiO‐66‐NH2(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 H2 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‐NH2 (Zr/Ti)/MXene (UZT/MX), also surpassing the majority of reported MOF‐based photocatalysts. Through a unique carboxyl group assisted coordination route, UiO‐66‐NH2(Zr/Ti)/carboxyl‐functionalized MXene (UZT/CFMX) composite with intimate interactions is successfully constructed. Such intimately coupled heterojunctions display high activity for solar‐driven water splitting.