Single-atom catalysts offer a pathway to cost-efficient catalysis using the minimal amount of precious metals. However, preparing and keeping them stable during operation remains a challenge. Here we report the synthesis of double transition metal MXene nanosheets—Mo2TiC2Tx, with abundant exposed basal planes and Mo vacancies in the outer layers—by electrochemical exfoliation, enabled by the interaction between protons and the surface functional groups of Mo2TiC2Tx. The as-formed Mo vacancies are used to immobilize single Pt atoms, enhancing the MXene’s catalytic activity for the hydrogen evolution reaction. The developed catalyst exhibits a high catalytic ability with low overpotentials of 30 and 77 mV to achieve 10 and 100 mA cm−2 and a mass activity about 40 times greater than the commercial platinum-on-carbon catalyst. The strong covalent interactions between positively charged Pt single atoms and the MXene contribute to the exceptional catalytic performance and stability.
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The data that support the findings of this study are available from the corresponding authors upon reasonable request.
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The authors thank P. Li from Nanjing University of Aeronautics and Astronautics, Nanjing for performing DFT calculations. Y. Zheng from the University of Adelaide and Y.-C. Huang from the National Synchrotron Radiation Research Centre are acknowledged for their valuable discussions. The authors acknowledge use of the JEOL 2010 and JEOL JEM-ARM200F STEM within the University of Wollongong (UoW) Electron Microscopy Centre. This project was financially supported by the Australian Research Council (ARC) through ARC Discovery projects (DP160104340 and DP170100436) and a Rail Manufacturing CRC (RMCRC) project.
The authors declare no competing interests.
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Supplementary Figs 1–31, Supplementary Tables 1–4, Supplementary Notes 1–5 and Supplementary References
Atomic coordinates of the optimized (3x3) Mo2TiC2O2–PtSA model
Atomic coordinates of the optimized (3x3) Mo2TiC2O2 model
Atomic coordinates of the optimized (4x4) Mo2TiC2O2–PtSA model
Atomic coordinates of the optimized (4x4) Mo2TiC2O2 model
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Zhang, J., Zhao, Y., Guo, X. et al. Single platinum atoms immobilized on an MXene as an efficient catalyst for the hydrogen evolution reaction. Nat Catal 1, 985–992 (2018). https://doi.org/10.1038/s41929-018-0195-1
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