Hierarchically heterostructured Pt/CrN-TiN derived from metal organic frameworks as an efficient electrocatalyst for methanol oxidation reaction

摘要

Exploiting cost-effective and highly efficient electrocatalysts toward methanol oxidation reaction (MOR) is meaningful but challenging. Metal-organic framework (MOF)-based de-rivatives have attracted much attention of the community in various research fields. Herein, a novel metal-organic framework derived three dimensional (3D) heterostructure (Pt/CrN-TiN) has been synthesized as an efficient MOR electrocatalyst through interfacial engineering. Benefiting from the unique 3D penetrating structure and the abundant het-erogeneous interfaces, the Pt/CrN-TiN heterostructure exposed maximum active sites, open diffusion channels, and accelerated electron transfer at heterogeneous interfaces, thus modulating adsorption/desorption behavior of targeted reactants/intermediates and eventually facilitating the MOR kinetics. Impressively, the designed Pt/CrN-TiN catalyst performed high catalytic activity toward methanol oxidation reaction (1.14 A mgpt ?1) compared to that of Pt/CrN (0.18 A mgpt ?1), Pt/TiN (0.64 A mgpt ?1) and Pt/C (0.44 A mgpt ?1), respectively. Density functional theory (DFT) calculations reveal that the existing hetero-interfaces optimize the free energy of intermediates during MOR, accelerating the reaction kinetics. We believe that the current work provides new insight and useful guidance for fabricating advanced electrocatalysts.

关键词