Title

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

Publication Name

Advanced Functional Materials

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-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.

Open Access Status

This publication may be available as open access

Funding Number

LDQN2019007

Funding Sponsor

Australian Research Council

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Link to publisher version (DOI)

http://dx.doi.org/10.1002/adfm.202202571