Catalytic selectivity of nanorippled graphene

Yu Liu, Wenqi Xiong, Achintya Bera, Yu Ji, Miao Yu, Shi Chen, Li Lin, Shengjun Yuan, Pengzhan Sun

Research output: Contribution to journalArticlepeer-review

Abstract

Experiments have shown that nanoscale ripples in a graphene membrane exhibit unexpectedly high catalytic activity with respect to hydrogen dissociation. Nonetheless, the catalytic selectivity of nanorippled graphene remains unknown, which is an equally important property for assessing a catalyst's potential and its fit-for-purpose applications. Herein, we examine the catalytic selectivity of nanorippled graphene using a model reaction of molecular hydrogen with another simple but double-bonded molecule, oxygen, and comparing the measurement results with those from splitting of hydrogen molecules. We show that although nanorippled graphene exhibits a high catalytic activity toward hydrogen dissociation, the activity for catalyzing the hydrogen-oxygen reaction is quite low, translating into a strong catalytic selectivity. The latter reaction involves the reduction of oxygen molecules by the dissociated hydrogen adatoms, which requires additional energy cost and practically determines the selectivity. In this sense, the well-established information about reactions in general of atomic hydrogen with many other species in the literature could potentially predict the selectivity of nanorippled graphene as a catalyst. Our work provides implications for the catalytic properties of nanorippled graphene, especially its selectivity. The results would be important for its extension to a wider range of reactions and for designer technologies involving hydrogen.

Original languageEnglish
Pages (from-to)449-455
Number of pages7
JournalNanoscale Horizons
Volume9
Issue number3
Early online date4 Jan 2024
DOIs
Publication statusPublished - 1 Mar 2024

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