In situ conversion builds MIL-101@NiFe-LDH heterojunction structures to enhance the oxygen evolution reaction

The construction of rich phase interfaces to increase active reaction area in hybrid materials is an excellent strategy to improve electrochemical performance. Under this guideline, [email protected] organic framework (MOF) is constructed by the "MOF on MOF" method, then converts to [email protected] double hydroxides (LDH) by in situ transformation in alkaline solution. [email protected] shows excellent electrochemical water oxidation performance. It needs only an overpotential of 215 mV to drive 10 mA/cm2 of oxygen evolution reaction (OER), which is less than that of NiFe-LDH, MIL-101. In addition, [email protected] has the smallest Tafel slope (55.1 mV/dec) compared with NiFe-LDH (61.1 mV/dec), MIL-101 (150.8 mV/dec). The excellent water oxidation activity is due to the high phase interfaces derived from high specific surface area of MOF. This work offers an alternative method for making MOF/LDH heterostructures with an optimized phase interfaces and provides new insights for OER.