Self-stabilization of zero-dimensional PdIr nanoalloys at two-dimensional manner for boosting their OER and HER performance
| Autor: | Yawen Tang, Wu Lei, Keying Su, Yingzi Wang, Xiaoyu Qiu, Shangzhi Wang, Anzhou Yang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Boosting (machine learning)
Materials science Oxygen evolution General Physics and Astronomy High density Nanotechnology Self-stabilization 02 engineering and technology Surfaces and Interfaces General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Nanocrystal Hydrogen evolution 0210 nano-technology |
| Zdroj: | Applied Surface Science. 510:145408 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2020.145408 |
| Popis: | It remains a grand challenge to transform zero-dimensional (0D) noble-metal building blocks into well-defined two-dimensional (2D) architectures, which normally lacking an intrinsic driving force for anisotropic permutation in 2D manner. Herein, we report the first example of using a simple but efficient hydrothermal route to synthesize and self-stabilize ultrathin 0D PdIr NCs (2.4 nm) into a new class of freestanding 2D porous PdIr nanosheets with lateral size up to 1.5 μm (PdIr PNSs). Distinguished from previously reported 2D noble-metal nanosheets, the resultant 2D PdIr PNSs with immense surface area-to-volume ratio and high density of exposed atoms largely retain the special natures of 0D PdIr building blocks and further optimize their catalytic activity and stability at 2D manner. Electrochemical studies show that 2D PdIr PNSs deliver both excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities with an HER overpotential of 40 mV and an OER overpotential of 285 mV affording 10 mA cm−2, outperforming those of 0D PdIr building blocks. The present work highlights the importance of tuning 0D nanocrystals at 2D manner for enhancing their OER and HER performance. |
| Databáze: | OpenAIRE |
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