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Strong Metal-support Interaction Boosted Electrocatalysis for Highly Efficient Water Electrolysis in Acidic and Alkaline Media
Release time: 2019-09-03 09:31:08   author:本站编辑   source: 本站原创   Number of visits:

Strong metal-support interaction boosted electrocatalysis for highly efficient water electrolysis in acidic and alkaline media

         Strong metal-support interaction has been explored as an efficient way in heterogeneous catalysis to modulate the electronic structure of active metal for enhanced catalytic activity. By using this interaction, Prof. Weihua Hu’s group recently reports ultrasmall iridium nanoparticles supported on nitrogen-doped graphene sheets (Ir@N-G-750) with boosted electrocatalytic activity and durability toward hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) for highly efficient water electrolysis. As-reported Ir@N-G-750 demonstrates excellent HER and OER activity superior to benchmarking Pt/C and RuO2/IrO2 catalysts, respectively in both acidic and alkaline media; as a bifunctional electrocatalyst, it enables long-term 1.6 V-overall water splitting at 20 mA cm−2 current density when loaded on planar glassy carbon electrode at a total Ir loading of 23 μg cm−2. Detailed investigation unveils abundant Ir–N coordination in Ir@N-G-750, which enhances the electron density and modifies electronic structure of Ir nanoparticles to facilitate the electrochemical reactions. Density functional theory (DFT) calculation indicates that N dopants can stabilize the supported Ir clusters and improve their electrocatalytic activities.

This work was jointly published with Prof. Liang Chen’s group in Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences.

Nano Energy 2019, 62, 117-126. DOI: 10.1016/j.nanoen.2019.05.034