Few-layer MoS2 and Pt nanoparticles Co-anchored on MWCNTs for efficient hydrogen evolution over a wide pH range
| Autor: | Chenglong Luan, Danhua Ren, Juntao Yang, Congli Qin, Xiaoping Dai, Xu Fang, Peng Zheng, Aixin Fan, Xin Zhang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
General Chemical Engineering 02 engineering and technology Carbon nanotube Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry Electrocatalyst 01 natural sciences 0104 chemical sciences law.invention Chemical engineering law Water splitting Density functional theory 0210 nano-technology Layer (electronics) Hydrogen production |
| Zdroj: | Electrochimica Acta. 358:136927 |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2020.136927 |
| Popis: | Considering the practical use of electrochemical water splitting, it is important to construct a highly efficient and stable hydrogen evolution reaction (HER) electrocatalyst over a wide pH range. Herein, we develop an efficient strategy to enhance the electrochemical activity of few-layer MoS2 and Pt nanoparticles (NPs) anchored on multi-wall carbon nanotube (MWCNTs). The as-prepared Pt-MoS2/MWCNTs provides an excellent HER electrocatalytic activity with low overpotentials at −10 mA cm−2 over a wide pH range, namely, 20 mV in 0.5 M H2SO4, 92 mV in 1.0 M phosphate buffer solution (PBS), and 75 mV in 1.0 M KOH, respectively. In addition, Pt-MoS2/MWCNTs deliver the highest mass activity at the overpotential of 0.05 V, which is 8.1, 2.3, and 26.5 times higher than that of commercial 20 wt% Pt/C in acidic, neutral and alkaline media, respectively. Density functional theory (DFT) calculations revealed that the co-existence of MoS2 and Pt NPs facilitated the water dissociation reaction and hydrogen generation, thereby enhancing the activity of HER. This work provides a potential strategy to construct high-performance electrocatalysts for HER over the entire pH range. |
| Databáze: | OpenAIRE |
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