Intermediate Modulation on Noble Metal Hybridized to 2D Metal-Organic Framework for Accelerated Water Electrocatalysis

By Chunxia Guo, Y. Jiao, Yao Zheng, Jun Luo, Kenneth Davey, S. Qiao. Chem, 2019

164 citations recorded by the source corpus.

Summary The rational modulation of reaction intermediates is critical to achieving high-performance heterogeneous catalysis. However, practical realization remains challenging. Using water electrocatalysis as a model reaction, we report an interfacial-bond-induced intermediate modulation to accelerate the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by hybridizing a 2D nickel metal-organic framework (MOF) and Pt nanocrystals into a heterostructure. The design is initially verified via theoretical calculations, indicating charge relocation on newly formed Ni–O–Pt interfacial bonds for increased OH* adsorption energy together with reduced H* adsorption energy. Experimental findings confirm the formation of the Ni–O–Pt bonds, which electronically modify the heterostructure to increase electron density for Pt and the high-energy Ni 3d state for the MOF, optimizing the adsorption for H* and OH*, respectively. This hybridized material delivered HER activity of 7.92 mA μg−1 Pt, which is among the best reported for alkaline electrocatalysts, and an improved OER activity.

Subfields: Electrochemistry, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/2e0409775c43e4e72f6daa15e264198c33a9ef33