Ripple-assisted adsorption of noble gases on graphene at room temperature

TL;DR

This study demonstrates stable, high-capacity noble gas adsorption on rippled graphene at room temperature, with potential applications in gas storage, separation, and surface modification, supported by both theoretical and experimental evidence.

Contribution

It introduces a novel ripple-assisted adsorption method for noble gases on graphene at room temperature, combining simulation and experimental validation.

Findings

Noble gases can be stably adsorbed on rippled graphene at room temperature.

Adsorbed noble gases form crystalline arrangements and are fully desorbable at ~350°C.

The adsorption process influences graphene's properties, which fully recover after desorption.

Abstract

Controllable gas adsorption is critical for both scientific and industrial fields, and high-capacity adsorption of gases on solid surfaces provides a significant promise due to its high-safety and low-energy consumption. However, the adsorption of nonpolar gases, particularly noble gases, poses a considerable challenge under atmospheric pressure and room temperature (RT). Here, we theoretically simulate and experimentally realize the stable adsorption of noble gases like xenon (Xe), krypton (Kr), argon (Ar), and helium (He) on highly rippled graphene at RT. The elemental characteristics of adsorbed Xe are confirmed by electron energy loss spectroscopy and X-ray photoelectron spectroscopy. The adsorbed gas atoms are crystalized with periodic arrangements. These adsorbed noble gases on graphene exhibit high stability at RT and can be completely desorbed at approximately 350 {\deg}C without damaging the intrinsic lattice of graphene. The structural and physical properties of graphene are significantly influenced by the adsorbed gas, and they fully recover after desorption. Additionally, this controllable adsorption could be generalized to other layered adsorbents such as NbSe2, MoS2 and carbon nanotubes. We anticipate that this ripple-assisted adsorption will not only re-define the theoretical framework of gas adsorption, but also accelerate advancements in gas storage and separation technologies, as well as enhance the applications in catalysis, surface modification, and other related fields.