Supporting Information Highly Active and Stable Hydrogen Evolution ...
Supporting Information
Highly Active and Stable Hydrogen Evolution Electrocatalysts Based on Molybdenum Compounds on Carbon Nanotube-Graphene Hybrid Support
Duck Hyun Youn,†,§ Suenghoon Han,#,§ Jae Young Kim,† Jae Yul Kim,† Hunmin Park,# Sun Hee Choi,‡ and Jae Sung Lee†,*
†School
of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science
and Technology (UNIST), Ulsan 689-798, Korea #
Department of Chemical Engineering, Pohang University of Science and Technology
(POSTECH), Pohang 790-784, Korea ‡ Pohang
Accelerator Laboratory (PAL), Pohang University of Science and Technology
(POSTECH), Pohang 790-784, Korea
Corresponding author [email protected] Tel: +82-52-217-2544, Fax +82-52-217-1019
Figure S1. Enlarged images of insets in Figure 1b-d. a) Mo2C/CNT-GR, b) Mo2N/CNT-GR, and c) MoS2/CNT-GR.
Figure S2. TEM images of the bare catalysts. a,b) Mo2C, c,d) Mo2N, and e,f) MoS2.
Figure S3. a) Mo K-edge XANES spectra and b) their derivative spectra of MoS2 catalysts. The spectra of commercial MoO3 are compared.
Figure S4. H2-TPD spectra for the prepared Mo-compound catalysts. The numbers in the figure denote the peak temperature for H2 desorption.
Figure S5. Electrochemical characterizations of the bare catalysts with Mo2C/CNT-GR catalyst. a) polarization curves, b) Tafel plots
Figure S6. a) XRD patterns of the synthesized Mo2C nanocrystals supported on the various carbon supports. TEM images of b) Mo2C/CNT, c) Mo2C/GR, and d) Mo2C/C.
Figure S7. Raman spectra of the synthesized Mo2C nanoparticles supported on CNT-GR, CNT, and GR. Those of CNT and GO are presented for comparison. The number in the figure represents the ID/IG intensity ratio.
Table S1. The activities of recently-reported Mo-based electrocatalysts for HER in acid media.[22]
a)
Catalyst
η10 [mV]
j@η=150mV [mAcm-2]
Loading [mgcm-2]
Mass activity@η=150 [mAmg-1]
Mo2C/CNT-GR
130
21.8
0.65
33.5
Mo2N/CNT-GR
186
2.35
0.67
3.5
MoS2/CNT-GR
255
1
0.65
1.5
Mo2C
210
1
1.4
0.7
14
Mo2C/CNT
152
9.8
2
4.9
21
Mo1Soy/RGO
109
31.6
0.47
67.2
22
MoN/C
NA
0.1
0.25
0.4
15
NiMoNx/C
NA
1.5
0.25
6
15
MoS2/RGO
160
8.0
1
8.0
17
Cu2MoS4
310
0.5
0.0416
12.0
31
Mo2C NW
130
20
0.21
95.2
23
WC
125
20
1
20
10
Fe-WCN
250
1.5
0.4
3.75
38
Ni2P
120
20 (@η=130)
1
20 (@η=130)
39
Reference
Present Work
Note that there are small differences in the electrochemical measurement conditions of
these works.
Table S2. The measured amounts of molybdenum by ICP and corresponding amounts of Mocompound in the synthesized catalysts. The figures in parenthesis denote intended amounts of Mo at the initial stage.
Catalysts
wt% of Mo by ICP
wt% of Mo-compound
Mo2C/CNT-GR
61.3 (70)
65.13
Mo2N/CNT-GR
62.6 (70)
67.16
MoS2/CNT-GR
39.2 (45)
65.35
Highly Active and Stable Hydrogen Evolution Electrocatalysts Based on Molybdenum Compounds on Carbon Nanotube-Graphene Hybrid Support
Duck Hyun Youn,†,§ Suenghoon Han,#,§ Jae Young Kim,† Jae Yul Kim,† Hunmin Park,# Sun Hee Choi,‡ and Jae Sung Lee†,*
†School
of Nano-Bioscience and Chemical Engineering, Ulsan National Institute of Science
and Technology (UNIST), Ulsan 689-798, Korea #
Department of Chemical Engineering, Pohang University of Science and Technology
(POSTECH), Pohang 790-784, Korea ‡ Pohang
Accelerator Laboratory (PAL), Pohang University of Science and Technology
(POSTECH), Pohang 790-784, Korea
Corresponding author [email protected] Tel: +82-52-217-2544, Fax +82-52-217-1019
Figure S1. Enlarged images of insets in Figure 1b-d. a) Mo2C/CNT-GR, b) Mo2N/CNT-GR, and c) MoS2/CNT-GR.
Figure S2. TEM images of the bare catalysts. a,b) Mo2C, c,d) Mo2N, and e,f) MoS2.
Figure S3. a) Mo K-edge XANES spectra and b) their derivative spectra of MoS2 catalysts. The spectra of commercial MoO3 are compared.
Figure S4. H2-TPD spectra for the prepared Mo-compound catalysts. The numbers in the figure denote the peak temperature for H2 desorption.
Figure S5. Electrochemical characterizations of the bare catalysts with Mo2C/CNT-GR catalyst. a) polarization curves, b) Tafel plots
Figure S6. a) XRD patterns of the synthesized Mo2C nanocrystals supported on the various carbon supports. TEM images of b) Mo2C/CNT, c) Mo2C/GR, and d) Mo2C/C.
Figure S7. Raman spectra of the synthesized Mo2C nanoparticles supported on CNT-GR, CNT, and GR. Those of CNT and GO are presented for comparison. The number in the figure represents the ID/IG intensity ratio.
Table S1. The activities of recently-reported Mo-based electrocatalysts for HER in acid media.[22]
a)
Catalyst
η10 [mV]
j@η=150mV [mAcm-2]
Loading [mgcm-2]
Mass activity@η=150 [mAmg-1]
Mo2C/CNT-GR
130
21.8
0.65
33.5
Mo2N/CNT-GR
186
2.35
0.67
3.5
MoS2/CNT-GR
255
1
0.65
1.5
Mo2C
210
1
1.4
0.7
14
Mo2C/CNT
152
9.8
2
4.9
21
Mo1Soy/RGO
109
31.6
0.47
67.2
22
MoN/C
NA
0.1
0.25
0.4
15
NiMoNx/C
NA
1.5
0.25
6
15
MoS2/RGO
160
8.0
1
8.0
17
Cu2MoS4
310
0.5
0.0416
12.0
31
Mo2C NW
130
20
0.21
95.2
23
WC
125
20
1
20
10
Fe-WCN
250
1.5
0.4
3.75
38
Ni2P
120
20 (@η=130)
1
20 (@η=130)
39
Reference
Present Work
Note that there are small differences in the electrochemical measurement conditions of
these works.
Table S2. The measured amounts of molybdenum by ICP and corresponding amounts of Mocompound in the synthesized catalysts. The figures in parenthesis denote intended amounts of Mo at the initial stage.
Catalysts
wt% of Mo by ICP
wt% of Mo-compound
Mo2C/CNT-GR
61.3 (70)
65.13
Mo2N/CNT-GR
62.6 (70)
67.16
MoS2/CNT-GR
39.2 (45)
65.35
