石墨烯
氢
氘
材料科学
电化学
动力学同位素效应
电解质
化学物理
纳米技术
可逆氢电极
量子隧道
电极
分析化学(期刊)
化学
物理化学
原子物理学
工作电极
光电子学
有机化学
物理
作者
Satoshi Yasuda,Hisayoshi Matsushima,Kenji Harada,Risako Tanii,Tomo‐o Terasawa,Masahiro Yano,Hidehito Asaoka,Jessiel Siaron Gueriba,Wilson Agerico Diño,Katsuyuki Fukutani
出处
期刊:ACS Nano
[American Chemical Society]
日期:2022-09-01
卷期号:16 (9): 14362-14369
被引量:13
标识
DOI:10.1021/acsnano.2c04655
摘要
The fabrication of a hydrogen isotope enrichment system is essential for the development of industrial, medical, life science, and nuclear fusion fields, and therefore, efficient enrichment techniques with a high separation factor and economic feasibility are still being explored. Herein, we report a hydrogen/deuterium (H/D) separation ability with polymer electrolyte membrane electrochemical hydrogen pumping (PEM-ECHP) using a heterogeneous electrode consisting of palladium and graphene layers (PdGr). By mass spectroscopic analysis, we demonstrate significant bias voltage dependence of the H/D separation factor with a maximum of ∼25 at 0.15 V and room temperature, which is superior to those of conventional separation methods. Theoretical analysis demonstrated that the observed high H/D factor stems from tunneling of hydrogen isotopes through atomically thick graphene during the electrochemical reaction and that the bias dependence of H/D results from a transition from the quantum tunneling regime to the classical overbarrier regime for hydrogen isotopes transfer through the graphene. These findings will help us understand the origin of the isotope separation ability of graphene discussed so far and contribute to developing an economical hydrogen isotope enrichment system using two-dimensional materials.
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