期刊
NANO LETTERS
卷 22, 期 3, 页码 1398-1405出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c04809
关键词
Pt single atom; oxygen vacancy; Ti3C2Tx; hydrogen evolution
类别
资金
- 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]
Two-dimensional MXene-loaded single-atom catalysts have gained increasing attention. Pt single atoms are successfully immobilized on oxygen vacancies of monolayer Ti3C2Tx flakes, and the resulting catalyst shows excellent performance in hydrogen evolution reaction.
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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