Journal
NANO LETTERS
Volume 22, Issue 3, Pages 1398-1405Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04809
Keywords
Pt single atom; oxygen vacancy; Ti3C2Tx; hydrogen evolution
Categories
Funding
- National Natural Science Foundation of China [51872012]
- National Key Technologies R&D Program of China [2018YFA0306900]
- Guangdong Innovative and Entrepreneurial Research Team Program [2017ZT07C341]
- Bureau of Industry and Information Technology of Shenzhen
- Graphene Manufacturing Innovation Center Project [201901171523]
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By immobilizing Pt SAs on the O-V of Ti3C2Tx, a novel catalyst with excellent HER performance was successfully constructed, showing small overpotential and high activity.
Two-dimensional (2D) MXene-loaded single-atom (SA) catalysts have drawn increasing attention. SAs immobilized on oxygen vacancies (O-V) of MXene are predicted to have excellent catalytic performance; however, they have not yet been realized experimentally. Here Pt SAs immobilized on the O-V of monolayer Ti3C2Tx flakes are constructed by a rapid thermal shock technique under a H-2 atmosphere. The resultant Ti3C2Tx-Pt-SA catalyst exhibits excellent hydrogen evolution reaction (HER) performance, including a small overpotential of 38 mV at 10 mA cm(-2), a high mass activity of 23.21 A mg(Pt)(-1), and a large turnover frequency of 23.45 s(-1) at an overpotential of 100 mV. Furthermore, density functional theory calculations demonstrate that anchoring the Pt SA on the O-V of Ti3C2Tx helps to decrease the binding energy and the hybridization strength between H atoms and the supports, contributing to rapid hydrogen adsorption-desorption kinetics and high activity for the HER.
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