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|Title:||Intermediate modulation on noble metal hybridized to 2D metal-organic framework for accelerated water electrocatalysis|
|Citation:||Chem, 2019; 5(9):2429-2441|
|Chunxian Guo, Yan Jiao, Yao Zheng, Jun Luo, Kenneth Davey, Shi-Zhang Qiao|
|Abstract:||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.|
|Rights:||© 2019 Elsevier Inc.|
|Appears in Collections:||Chemical Engineering publications|
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