3.8 Article

Sub-nanometric Pt clusters supported Co aerogel electrocatalyst with hierarchical micro/nano-porous structure for hydrogen evolution reaction

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DOI: 10.1016/j.apcatb.2023.123546

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Sub-nanometric clusters; Mass transport; Hierarchical micro/nano-porous; High-current PEM electrolyser; Hydrogen evolution reaction

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In this study, we report a hierarchical micro/nano-porous structure of sub-nanometric Pt clusters supported Co aerogel catalyst, which demonstrates excellent catalytic performance and stability in PEM electrolysis with the industrially required current density.
The construction of interactions and synergies between sub-nanometric clusters and supports provides unexpected opportunity to realize high performance and low-cost composite catalysis. However, hierarchical micro/ nano-porous structured catalysts closely related to mass transport have been neglected as support, which may play a leading role in industrial practical applications. Herein, we report sub-nanometric Pt clusters supported Co aerogel (Ptx/Co, X is the wt% of Pt) with hierarchical micro/nano-porous structure, and after optimization of the loading, Pt0.25/Co shows excellent HER performance. Additionally, Pt0.25/Co demonstrates the industrially needed current density of 1.0 A cm-2 at 1.8 V in PEM electrolyser, achieving stability in excess of 200 h. Theoretical calculations show that the advantages of the hierarchical micro/nano-porous structure accelerate the mass transport at the three-phase interface, and the strong interaction between sub-nanometric Pt clusters and Co aerogel not only optimizes the electronic structure of Pt0.25/Co, but also inhibits the dissolution of subnanometric Pt clusters.

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