1. Volume 1, Issue 2, Pages 383-393 (October 2017)
Nanohybridization of MoS2 with Layered Double Hydroxides Efficiently Synergizes the Hydrogen Evolution in Alkaline Media 
Jue Hu, Chengxu Zhang, Lin Jiang, He Lin, Yiming An, Dan Zhou, Michael K.H. Leung, Shihe Yang 
Joule 
Volume 1, Issue 2, Pages (October 2017)
DOI: /j.joule
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3. Figure 1
Synthetic Strategy for and Structure Characterizations of the MoS2/NiCo-LDH Composite
(A) Schematic of synthesis processes of the MoS2/NiCo-LDH composite.
(B–D) FESEM images of (B) a pristine CFP substrate, and those after growing (C) MoS2 sheet array and (D) MoS2/NiCo-LDH composite.
(E and H) Low-magnification (E) and high-magnification (H) TEM images of NiCo-LDH. See also Figure S6.
(F and I) Low-magnification (F) and high-magnification (I) TEM images of the MoS2 array vertically aligned on the carbon substrate. The crystal fringes taper toward the edge with steps indicated by white arrows.
(G and J) Low-magnification (G) and high-magnification (J) TEM images of the MoS2/NiCo-LDH composite, showing their interfaces (red dotted lines). See also Figure S7.
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4. Figure 2 Structure Analysis of the MoS2/NiCo-LDH Composite
(A) HRTEM image of the MoS2/NiCo-LDH composite. The corresponding FFT patterns of the selected areas marked by white dashed squares (i and ii) are shown. Inset: schematic illustration of the designed MoS2/NiCo-LDH heterostructure. See also Figure S8.
(B) SAED pattern of the MoS2 and MoS2/NiCo-LDH samples.
(C) XRD patterns of the MoS2 and MoS2/NiCo-LDH samples, together with the standard pattern of 2H MoS2 (JCPDS ).
(D) High-resolution X-ray photoelectron Ni 2p spectrum of MoS2/NiCo-LDH composite. See also Figures S13 and S14.
(E) High-resolution X-ray photoelectron Co 2p spectrum of MoS2/NiCo-LDH composite.
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5. Figure 3 HER Activity of the MoS2/NiCo-LDH Composite
(A) Polarization curves of the CFP substrate, bare NiCo-LDH, MoS2, and MoS2/NiCo-LDH composite catalysts in 1 M KOH solution at a scan rate of 5 mV/s.
(B) Charging current density differences plotted against scan rate of bare MoS2 and MoS2/NiCo-LDH composite catalysts, Cdl is equivalent to the slope of the fitted line. See also Figure S15.
(C) Tafel plots for the bare MoS2 and MoS2/NiCo-LDH composite catalysts.
(D) Nyquist plots of the bare MoS2 and MoS2/NiCo-LDH composite catalysts at the overpotential of 200 mV.
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6. Figure 4
HER Performance Comparison and Stability Evaluation of the MoS2/NiCo-LDH Composite
(A) Comparison of overpotential required to generate a current density of 10 mA/cm2, together with Tafel slope (mV/dec) on nickel-, cobalt-, and molybdenum-based compound catalysts. See also Table S1.
(B) Polarization curves recorded from MoS2/NiCo-LDH composite at a scan rate of 5 mV/s before (solid curve) and after (dotted curve) the chronopotentiometry test at −20 mA/cm2 of 48 hr. Inset: chronopotentiometry responses (η ∼ t) recorded from MoS2/NiCo-LDH composite at high current densities of −20 mA/cm2 and −50 mA/cm2. See also Figures S21–S27.
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7. Figure 5 HER Kinetics Analysis of the MoS2/NiCo-LDH Composite
(A) ECSA normalized polarization curves (symbols) of bare MoS2 and MoS2/NiCo-LDH composite catalysts in 1 M KOH solution at a scan rate of 5 mV/s with the best fits (lines) using the dual-pathway kinetic model. The fitted standard activation free energies are shown with the unit of meV.
(B) Free energy diagram of the dominant Volmer-Heyrovsky pathway for HER in alkaline electrolyte for bare MoS2 (blue) and MoS2/NiCo-LDH composite (red) catalysts. See also Figure S29.
(C) Schematic illustration of the HER in MoS2/LDH interface in alkaline environment. The synergistic chemisorption of H (on MoS2) and OH (on LDH) benefits the water dissociation step.
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