Perpendicularly Oriented MoSe₂/Graphene Nanosheets as Advanced Electrocatalysts for Hydrogen Evolution

Abstract

By increasing the density of exposed active edges, the perpendicularly oriented structure of MoSe2 nanosheets facilitates ion/electrolyte transport at the electrode interface and minimizes the restacking of nanosheets, while the graphene improves the electrical contact between the catalyst and the electrode. This makes the MoSe2 /graphene hybrid perfect as a catalyst in the hydrogen evolution reaction (HER). It shows a greatly improved catalytic activity compared with bare MoSe2 nanosheets.

Superaerophobic graphene nano-hills for direct hydrazine fuel cells

“…Similar levels of stability have been found from vertical structures of 2D materials, including graphene. 30,31 Moreover, the diffusion constant for VGNH-45 was calculated based on the Cottrell equation (see Supplementary Information for details) and was found to be 4.04 × 10 − 10 cm 2 s − 1 , which is much lower compared to previous values, making it a promising electrocatalyst for hydrazine oxidation. 4,5 Furthermore, the activation energy values of FG and VGNH-45 for oxidation were estimated according to the previously reported Arrhenius equation.…”

Facile preparation of 3D MoS2/MoSe2 nanosheet–graphene networks as efficient electrocatalysts for the hydrogen evolution reaction

“…Atomic force microscopy (AFM) images were obtained by using a Multimode V8 in the tapping mode after the samples were deposited on a freshly cleaved mica surface by spin coating. X-Ray photoelectron spectroscopy (XPS) spectra were acquired by 20 a RBD upgraded PHI-5000C ESCA system (Perkin Elmer) with Mg Ka radiation (hv = 1253.6 eV). X-ray powder diffraction (XRD) data were acquired by a D8 ADVANCE and DAVINCI.DESIGN (Bruker) X'pert diffractometer with Cu Kα radiation.…”

“…One potential 20 way to solve these problems is to develop various types of sustainable energy conversion and storage systems. 1 In particular, hydrogen production from electrochemical water splitting has attracted growing attention as a promising substitute for fossil fuels in the future.…”

“…35,36 In contrast, according to our previous investigation, some high boiling point solvents, like N, N-Dimethylformamide (DMF) and N-methyl-2pyrrolidone (NMP), have strong exfoliating ability to TMDs. 27,20 28, 37 Moreover, solvothermal effect of these high boiling point solvents can not only keep the few-layer structure of TMDs but also cut these nanosheets into quantum dots to form defect-rich structure which is beneficial to catalytic activity. 37 Hence, if these nanosheets can be hybridized with high conductive supports, the 25 catalytic activity of these composite for HER should be very remarkable.…”

CoP nanosheet assembly grown on carbon cloth: A highly efficient electrocatalyst for hydrogen generation

“…Significant progresses have been achieved in the development of acid-stable non-precious metal catalysts for HER [5][6][7][8][9]. Many economic metal compounds have been reported to show HER catalytic properties, such as MoS x [10][11][12][13], MoSe 2 [14][15][16], WS 2 [17][18][19][20][21], WSe 2 [22,23], MoB [24,25], Mo 2 C [26][27][28][29] and CoSe 2 [30][31][32][33]. However, the efficiency for most of the proposed catalysts is still much lower than that of Pt (Tafel is around 30 mV/dec), likely limited by the density and reactivity of available active sites.…”