Direct Observation of Accelerating Hydrogen Spillover Via Surface-lattice-confinement Effect

Overview

Journal Nat Commun

Specialty Biology

Date 2023 Feb 4

PMID 36739275

Authors

Yijing Liu

Rankun Zhang

Le Lin

Yichao Wang

Changping Liu

Rentao Mu

Qiang Fu

Affiliations

Soon will be listed here.

Abstract

Uncovering how hydrogen transfers and what factors control hydrogen conductivity on solid surface is essential for enhancing catalytic performance of H-involving reactions, which is however hampered due to the structural complexity of powder catalysts, in particular, for oxide catalysts. Here, we construct stripe-like MnO(001) and grid-like MnO(001) monolayers on Pt(111) substrate and investigate hydrogen spillover atop. Atomic-scale visualization demonstrates that hydrogen species from Pt diffuse unidirectionally along the stripes on MnO(001), whereas it exhibits an isotropic pathway on MnO(001). Dynamic surface imaging in H atmosphere reveals that hydrogen diffuses 4 times more rapidly on MnO than the case on MnO, which is promoted by one-dimension surface-lattice-confinement effect. Theoretical calculations indicate that a uniform and medium O-O distance favors hydrogen diffusion while low-coordinate surface O atom inhibits it. Our work illustrates the surface-lattice-confinement effect of oxide catalysts on hydrogen spillover and provides a promising route to improve the hydrogen spillover efficiency.

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