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|Title:||rGO/CNTs supported pyrolysis derivatives of [Mo₃S₁₃]²‾ clusters as promising electrocatalysts for enhancing hydrogen evolution performances|
|Other Titles:||rGO/CNTs supported pyrolysis derivatives of [Mo(3)S(13)](2)-bar clusters as promising electrocatalysts for enhancing hydrogen evolution performances|
|Citation:||ACS Sustainable Chemistry and Engineering, 2018; 6(5):6920-6931|
|Yanan Shang, Xing Xu, Zihang Wang, Bo Jin, Rui Wang, Zhongfei Ren, Baoyu Gao, Qinyan Yue|
|Abstract:||Reduced graphene oxide/carbon nanotube (rGO/CNTs) supported [Mo3S13]2– clusters and [Mo3S13]2– pyrolysis derivatives were synthesized as electrocatalysts for hydrogen production. We investigated the physio-chemical characteristics and electrocatalytic abilities of the [Mo3S13]2– clusters and their pyrolysis derivatives. TEM images of pyrolysis derivatives of [Mo3S13]2– clusters indicated that some crystalline derivatives were surrounded by the amorphous derivatives at an annealing temperature of 200–270 °C, and some well-crystallized MoS2 with diameters of 50–100 nm were observed in the pyrolysis derivatives at 500 °C. Both the structure transition and the HER performance of [Mo3S13]2– pyrolysis derivatives were mapped in terms of temperature. The atomic ratio of S:Mo significantly decreased from 3.48 to 1.89 as the annealing temperature increased, which indicated the multiple transition forms in pyrolysis derivatives. XPS, XRD, and Raman spectra also indicated the decreased density of edge sites and a poor extent of ordering in the layers of pyrolysis derivatives as the annealing temperature increased. These results corresponded well to the HER activities of the rGO/CNTs macrostructures anchored with different pyrolysis derivatives. The rGO/CNTs anchored with pyrolysis derivatives (annealed at 270 °C) of [Mo3S13]2– exhibited an overpotential of ∼178 mV (10 mA cm–2) with Tafel slope value located at 64.2 mV/dec, which showed relatively higher HER performances than most analogous single-metal molybdenum sulfide nanocomposites. They also exhibited a performance close to those of multimetal nanocomposites.|
|Keywords:||Hydrogen evolution reaction (HER); reduced graphene oxide; carbon nanotube; macrostructures [Mo3S13]2− clusters; pyrolysis derivatives|
|Rights:||© 2018 American Chemical Society.|
|Appears in Collections:||Chemical Engineering publications|
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