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An efficient molybdenum disulfide/cobalt diselenide hybrid catalyst for electrochemical hydrogen generation.

Gao MR, Liang JX, Zheng YR, Xu YF, Jiang J, Gao Q, Li J, Yu SH - Nat Commun (2015)

Bottom Line: The electroreduction of water for sustainable hydrogen production is a critical component of several developing clean-energy technologies, such as water splitting and fuel cells.However, finding a cheap and efficient alternative catalyst to replace currently used platinum-based catalysts is still a prerequisite for the commercialization of these technologies.The high hydrogen evolution activity of molybdenum disulfide/cobalt diselenide hybrid is likely due to the electrocatalytic synergistic effects between hydrogen evolution-active molybdenum disulfide and cobalt diselenide materials and the much increased catalytic sites.

View Article: PubMed Central - PubMed

Affiliation: Division of Nanomaterials &Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.

ABSTRACT
The electroreduction of water for sustainable hydrogen production is a critical component of several developing clean-energy technologies, such as water splitting and fuel cells. However, finding a cheap and efficient alternative catalyst to replace currently used platinum-based catalysts is still a prerequisite for the commercialization of these technologies. Here we report a robust and highly active catalyst for hydrogen evolution reaction that is constructed by in situ growth of molybdenum disulfide on the surface of cobalt diselenide. In acidic media, the molybdenum disulfide/cobalt diselenide catalyst exhibits fast hydrogen evolution kinetics with onset potential of -11 mV and Tafel slope of 36 mV per decade, which is the best among the non-noble metal hydrogen evolution catalysts and even approaches to the commercial platinum/carbon catalyst. The high hydrogen evolution activity of molybdenum disulfide/cobalt diselenide hybrid is likely due to the electrocatalytic synergistic effects between hydrogen evolution-active molybdenum disulfide and cobalt diselenide materials and the much increased catalytic sites.

No MeSH data available.


Related in: MedlinePlus

Characterization of the MoS2/CoSe2 hybrid.(a) Scanning electron microscopy image of MoS2/CoSe2 hybrid. Scale bar, 800 nm. (b,c) TEM images with different magnifications of MoS2/CoSe2 hybrid. Scale bars, 200 and 50 nm, respectively. The inset in c shows corresponding SAED pattern. (d) HRTEM images of MoS2/CoSe2 hybrid showing distinguishable microstructures of MoS2 and CoSe2. Scale bars, 5 nm. (e,f) XRD patterns and EDX spectrum of the MoS2/CoSe2 hybrid, respectively. (g) STEM-EDX elemental mapping of MoS2/CoSe2 hybrid showing clearly the homogeneous distribution of Co (red), Se (green), Mo (yellow) and S (azure). Scale bars, 200 nm.
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f2: Characterization of the MoS2/CoSe2 hybrid.(a) Scanning electron microscopy image of MoS2/CoSe2 hybrid. Scale bar, 800 nm. (b,c) TEM images with different magnifications of MoS2/CoSe2 hybrid. Scale bars, 200 and 50 nm, respectively. The inset in c shows corresponding SAED pattern. (d) HRTEM images of MoS2/CoSe2 hybrid showing distinguishable microstructures of MoS2 and CoSe2. Scale bars, 5 nm. (e,f) XRD patterns and EDX spectrum of the MoS2/CoSe2 hybrid, respectively. (g) STEM-EDX elemental mapping of MoS2/CoSe2 hybrid showing clearly the homogeneous distribution of Co (red), Se (green), Mo (yellow) and S (azure). Scale bars, 200 nm.

Mentions: The MoS2/CoSe2 hybrid was prepared directly in a closed N,N-dimethylformamide (DMF)/hydrazine solvothermal system, where (NH4)2MoS4 was used as a precursor for growing MoS2 around the freshly made CoSe2/DETA nanobelt substrates (Fig. 1a; Supplementary Fig. 1; see Methods for details of the synthesis). The MoS2-coated CoSe2 hybrid was shown by means of scanning electron microscopy and transmission electron microscopy (TEM; Fig. 2a–c), which revealed the compact graphene-like MoS2 nanosheets grown on the surface of CoSe2 with a partially free-standing branch-like feature (Supplementary Fig. 2). Substantial amino groups on the CoSe2/DETA surface (Supplementary Fig. 3) serve as nucleation sites for coupling Mo precursor and subsequently reduced to MoS2 on CoSe2 (refs 21, 23). A control experiment performed under identical synthesis conditions, but without CoSe2 nanobelts, produced three-dimensional (3D) aggregates of MoS2 sheets (Fig. 1b; Supplementary Fig. 4), suggesting that CoSe2 could be a useful support for mediating the growth of loaded materials and constructing novel functional hybrids.


An efficient molybdenum disulfide/cobalt diselenide hybrid catalyst for electrochemical hydrogen generation.

Gao MR, Liang JX, Zheng YR, Xu YF, Jiang J, Gao Q, Li J, Yu SH - Nat Commun (2015)

Characterization of the MoS2/CoSe2 hybrid.(a) Scanning electron microscopy image of MoS2/CoSe2 hybrid. Scale bar, 800 nm. (b,c) TEM images with different magnifications of MoS2/CoSe2 hybrid. Scale bars, 200 and 50 nm, respectively. The inset in c shows corresponding SAED pattern. (d) HRTEM images of MoS2/CoSe2 hybrid showing distinguishable microstructures of MoS2 and CoSe2. Scale bars, 5 nm. (e,f) XRD patterns and EDX spectrum of the MoS2/CoSe2 hybrid, respectively. (g) STEM-EDX elemental mapping of MoS2/CoSe2 hybrid showing clearly the homogeneous distribution of Co (red), Se (green), Mo (yellow) and S (azure). Scale bars, 200 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4309426&req=5

f2: Characterization of the MoS2/CoSe2 hybrid.(a) Scanning electron microscopy image of MoS2/CoSe2 hybrid. Scale bar, 800 nm. (b,c) TEM images with different magnifications of MoS2/CoSe2 hybrid. Scale bars, 200 and 50 nm, respectively. The inset in c shows corresponding SAED pattern. (d) HRTEM images of MoS2/CoSe2 hybrid showing distinguishable microstructures of MoS2 and CoSe2. Scale bars, 5 nm. (e,f) XRD patterns and EDX spectrum of the MoS2/CoSe2 hybrid, respectively. (g) STEM-EDX elemental mapping of MoS2/CoSe2 hybrid showing clearly the homogeneous distribution of Co (red), Se (green), Mo (yellow) and S (azure). Scale bars, 200 nm.
Mentions: The MoS2/CoSe2 hybrid was prepared directly in a closed N,N-dimethylformamide (DMF)/hydrazine solvothermal system, where (NH4)2MoS4 was used as a precursor for growing MoS2 around the freshly made CoSe2/DETA nanobelt substrates (Fig. 1a; Supplementary Fig. 1; see Methods for details of the synthesis). The MoS2-coated CoSe2 hybrid was shown by means of scanning electron microscopy and transmission electron microscopy (TEM; Fig. 2a–c), which revealed the compact graphene-like MoS2 nanosheets grown on the surface of CoSe2 with a partially free-standing branch-like feature (Supplementary Fig. 2). Substantial amino groups on the CoSe2/DETA surface (Supplementary Fig. 3) serve as nucleation sites for coupling Mo precursor and subsequently reduced to MoS2 on CoSe2 (refs 21, 23). A control experiment performed under identical synthesis conditions, but without CoSe2 nanobelts, produced three-dimensional (3D) aggregates of MoS2 sheets (Fig. 1b; Supplementary Fig. 4), suggesting that CoSe2 could be a useful support for mediating the growth of loaded materials and constructing novel functional hybrids.

Bottom Line: The electroreduction of water for sustainable hydrogen production is a critical component of several developing clean-energy technologies, such as water splitting and fuel cells.However, finding a cheap and efficient alternative catalyst to replace currently used platinum-based catalysts is still a prerequisite for the commercialization of these technologies.The high hydrogen evolution activity of molybdenum disulfide/cobalt diselenide hybrid is likely due to the electrocatalytic synergistic effects between hydrogen evolution-active molybdenum disulfide and cobalt diselenide materials and the much increased catalytic sites.

View Article: PubMed Central - PubMed

Affiliation: Division of Nanomaterials &Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei 230026, China.

ABSTRACT
The electroreduction of water for sustainable hydrogen production is a critical component of several developing clean-energy technologies, such as water splitting and fuel cells. However, finding a cheap and efficient alternative catalyst to replace currently used platinum-based catalysts is still a prerequisite for the commercialization of these technologies. Here we report a robust and highly active catalyst for hydrogen evolution reaction that is constructed by in situ growth of molybdenum disulfide on the surface of cobalt diselenide. In acidic media, the molybdenum disulfide/cobalt diselenide catalyst exhibits fast hydrogen evolution kinetics with onset potential of -11 mV and Tafel slope of 36 mV per decade, which is the best among the non-noble metal hydrogen evolution catalysts and even approaches to the commercial platinum/carbon catalyst. The high hydrogen evolution activity of molybdenum disulfide/cobalt diselenide hybrid is likely due to the electrocatalytic synergistic effects between hydrogen evolution-active molybdenum disulfide and cobalt diselenide materials and the much increased catalytic sites.

No MeSH data available.


Related in: MedlinePlus