Supporting Information 3D-hierarchical MoSe2 nanoarchitecture as a highly efficient electrocatalyst for hydrogen evolution Binjie Zheng, Yuanfu Chen*, Fei Qi, Xinqiang Wang, Wanli Zhang, Yanrong Li, and Xuesong Li* State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, P. R. China E-mail:
[email protected];
[email protected]
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Figure S1. Width, thickness and height distributions of 3D-MoSe2 based on 200,4 and 75 randomly selected nanosheets, respectively.
Figure S2. Optical (top) and SEM (bottom) images of 3D-MoSe2 (left) and Ho-MoSe2 (right). 2
Figure S3. TEM image of 3D-MoSe2.
Figure S4. Three monolayer MoSe2 nanosheets stack with each other.
Figure S5. The corresponding atomic models for the formed Moiré patterns in Figure 3f. 3
Figure S6. TEM images of Ho-MoSe2 films. Insets: corresponding FFT images of selected areas.
Figure S7. CV curves of (a) the 3D-MoSe2 and (b) Ho-MoSe2 films at various scan rates from 20 to 200 mV·s-1 in the region of 0 – 0.1 V (vs. RHE).
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Figure S8. Top-down (a) and cross-sectional (b) SEM images of 3D-MoSe2@CNT with colorization for clarity. The morphology of 3D-MoSe2 basically remains unchanged on ca. 3.8 µm CNT film. The width of MoSe2 nanosheets is slight larger than that grown on SiO2/Si substrate.
Figure S9. RHE voltage calibration. It shows that the E(SCE) is lower than E(RHE) by 0.253 V.
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Table S1. Summary of HER performance for MoSe2-based catalysts published recently. Method
Structure
Tafel slope of pure MoSe2
Modification
Tafel slope of modified MoSe2
Reference
APCVD
3D Hierarchical
47.3
carbon nanotubes
32.5
This work
colloidal route
porous microspheres
56
solvothermal
few-layered nanosheets
70
SnO2 nanotube
51
ref. 50
solvothermal
few-layered nanosheets
74
carbon nanotube
58
ref. 59
CVD
vertically oriented nanosheets
86
graphene network
61
ref. 41
solvothermal
porous nanosheets
88
reduced graphene oxide
61
ref. 58
solvothermal
few-layered nanosheets
92
carbon fiber
62
ref. 57
NiSe (nanohybrids)
56
colloidal route
nanoflowers
95 NiSe (mixed)
74
ref. 24
ref. 26
colloidal route
ultrathin nanoflowers
98
ref. 23
liquid exfoliation
nanosheets
100
single-walled carbon nanotubes
77
ref. 56
hydrothermal
nanosheets
101
reduced graphene oxide
69
ref. 22
solvothermal
nanoflowers
103
reduced graphene oxide
67
ref. 55
CVD
vertically aligned layers
105-120
carbon fiber paper
59.8
ref. 45
colloidal route
ultrathin nanosheets
106
s-doped
60
ref. 54
s-doped MoSe2-x nanotubes
91
solvothermal
nanocaterpillars
119 s-doped MoSe2-x nanosheets
68
ref. 53
CVD
monolayer
134
MoSe2x x=0.39
100
ref. 21
solvothermal
ultrathin nanosheets
141
1T- and 2H-MoSe2
78
ref. 29
plasma-assisted
few-layered shell
core-shell nanostructures
34.7
ref. 28
colloidal route
ultrathin nanoflakes
ketjen black
45
ref. 30
CVD
nanosheets
Mo(S0.53Se0.47)2 on carbon cloth
55.5
ref. 31
electrochemical
nanoparticles
reduced graphene oxide
82
ref. 25
electrochemical
nanosheets
carbon fiber cloth
76-102
ref. 27
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