Platinum-decorated graphene: Experimental insight into growth mechanisms and hydrogen adsorption properties

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem Pub Date : 2024-04-19 DOI:10.1016/j.flatc.2024.100661

Letizia Ferbel , Stefano Veronesi , Ylea Vlamidis , Antonio Rossi , Leonardo Sabattini , Camilla Coletti , Stefan Heun

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Abstract

Pt-functionalized graphene shows promise for near-ambient hydrogen storage due to graphene’s potential as a hydrogen host and platinum’s role as a catalyst for the hydrogen evolution reaction and spillover effect. This study explores Pt cluster formation on epitaxial graphene and its suitability for hydrogen storage. Scanning Tunneling Microscopy reveals two growth pathways. Initially, up to $\sim$ 1 monolayer of Pt coverage, Pt tends to randomly disperse and cover the graphene surface, whereas the cluster height remains unchanged. Beyond a coverage of 3 monolayer, the nucleation of new layers on existing clusters becomes predominant, and the clusters mainly grow in height. Thermal Desorption Spectroscopy on hydrogenated Pt-decorated graphene reveals the presence of multiple hydrogen adsorption mechanisms. Two Gaussian peaks, which we attribute to hydrogen physisorbed (peak at 155°C) and chemisorbed (peak at 430°C) on the surface of Pt clusters are superimoposed on a linearly increasing background assigned to hydrogen bonded in the bulk of the Pt clusters. These measurements demonstrate the ability of Pt-functionalized graphene to store molecular hydrogen at temperatures that are high enough for stable hydrogen binding at room temperature.

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铂装饰石墨烯：生长机制和氢吸附特性的实验启示

由于石墨烯具有作为氢宿主的潜力，而铂则是氢进化反应和溢出效应的催化剂，因此铂功能化石墨烯有望用于近环境储氢。本研究探讨了铂簇在外延石墨烯上的形成及其对储氢的适用性。扫描隧道显微镜揭示了两种生长途径。最初，在铂覆盖率达到 ∼ 1 单层时，铂趋向于随机分散并覆盖石墨烯表面，而簇高度保持不变。覆盖率超过 3 个单层后，新层在现有簇上的成核变得占主导地位，簇的高度主要增长。氢化铂装饰石墨烯的热解吸光谱显示了多种氢吸附机制的存在。我们将铂簇表面的氢物理吸附峰（155°C 时）和化学吸附峰（430°C 时）归结为两个高斯峰，与铂簇主体中氢键合的线性增加背景叠加在一起。这些测量结果表明，铂功能化石墨烯能够在足够高的温度下储存分子氢，从而在室温下实现稳定的氢结合。

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来源期刊

FlatChem Multiple-

CiteScore

8.40

自引率

6.50%

发文量

104

审稿时长

26 days

期刊介绍： FlatChem - Chemistry of Flat Materials, a new voice in the community, publishes original and significant, cutting-edge research related to the chemistry of graphene and related 2D & layered materials. The overall aim of the journal is to combine the chemistry and applications of these materials, where the submission of communications, full papers, and concepts should contain chemistry in a materials context, which can be both experimental and/or theoretical. In addition to original research articles, FlatChem also offers reviews, minireviews, highlights and perspectives on the future of this research area with the scientific leaders in fields related to Flat Materials. Topics of interest include, but are not limited to, the following: -Design, synthesis, applications and investigation of graphene, graphene related materials and other 2D & layered materials (for example Silicene, Germanene, Phosphorene, MXenes, Boron nitride, Transition metal dichalcogenides) -Characterization of these materials using all forms of spectroscopy and microscopy techniques -Chemical modification or functionalization and dispersion of these materials, as well as interactions with other materials -Exploring the surface chemistry of these materials for applications in: Sensors or detectors in electrochemical/Lab on a Chip devices, Composite materials, Membranes, Environment technology, Catalysis for energy storage and conversion (for example fuel cells, supercapacitors, batteries, hydrogen storage), Biomedical technology (drug delivery, biosensing, bioimaging)