Supporting Information. Engineering Two-Dimensional Mass-Transport Channels

Transcription

1 Supporting Information Engineering Two-Dimensional Mass-Transport Channels of MoS 2 Nanocatalyst towards Improved Hydrogen Evolution Performance Ge Wang a, Jingying Tao a, Yijie Zhang a, Shengping Wang a, Xiaojun Yan a, Congcong Liu a, Fei Hu a, Zhiying He a, Zhijun Zuo b, *, Xiaowei Yang a, * a Institute for Regenerative Medicine, Shanghai East Hospital, School of Materials Science and Engineering, Tongji University, Shanghai , China. b Key Laboratory of Coal Science and Technology of Ministry of Education and Shanxi Province, Taiyuan University of Technology, Taiyuan , Shanxi, China Corresponding Author * yangxw@tongji.edu.cn; zuozhijun@tyut.edu.cn. S-1

2 Figure S1. Characterization of the synthesized MoS 2 powders. (a) TEM image; (b) XRD pattern; (c, d) XPS scans for the Mo and S binding energies. S-2

3 Figure S2. The mechanism of the structural formation of channel-engineered MoS 2. Figure S3. SEM image of the cross-section of channel-engineered MoS 2. S-3

4 Figure S4. TEM image of carbon black. Figure S5. The HER performance of Pt/C, MS/C and MS. S-4

5 Figure S6. Cyclic voltammetry curves of MS (a) and MS/C (b) in the region of V vs SCE. Figure S7. Cyclic voltammetry curves of carbon black (a) and its plot of the extraction of C dl (b). S-5

6 Figure S8. Corresponding Randles equivalent circuit model of these MoS 2 electrode. Figure S9. The comparison of electrocatalytic properties between MS/Si, MS/C and MS. S-6

7 Figure S10. Durability test for the MS/C via cyclic voltammetry and chronopotentiometry curves (inset) at constant current densities of 100 ma cm -2. Figure S11. Comparison of overpotential and Tafel slope at the 2D substrate with other recently reported promising MoS 2 nanocatalysts. S-7

8 Figure S12. Comparison of overpotential and Tafel slope at 3D substrate with other recently reported promising MoS 2 nanocatalysts. Table S1. The R s, R i and R ct of MS and MS/C. R s (Ω) R i (Ω) R ct (Ω) MS MS/C S-8

9 Table S2. Comparison of the HER performance with other recently reported promising MoS 2 nanocatalysts at 2D electrode. Loading (mg cm -2 ) j (ma cm -2 ) (η = 227mV) Tafel slope (mv decade -1 ) Year MS/C This work MoS 2 nanoparticles/graphene ~45 ~ Amorphous MoS ~ Conducting MoS 2 nanosheets ~15 ~ Disorder engineered and oxygen-incorporated MoS Edge-terminated MoS Metallic phase MoS 2 nanosheets ~ Edge-oriented and Interlayer expanded MoS 2 /rgo ~ Nitrogen doped MoS 2 nanosheets ~ Size-controlled MoS 2 nanodots supported on ~ reduced graphene oxide 9 Amorphous MoS 2 /CNTs S-9

10 Table S3. Comparison of the HER performance with other recently reported promising MoS 2 nanocatalysts at 3D electrode. Loading (mg cm -2 ) j (ma cm -2 ) (η = 191mV) Tafel slope (mv decade -1 ) Year MS/C-CP This work Li-tuning vertical aligned MoS 2 /CFP MoS 2 /N-doped CNT forest Amorphous MoS x Cl y /vertical graphene growth at graphit disk 13 Basal planes activated and S- terminated MoS 2 /CC Stepped edge engineered MoS 2 /CFP MoS 2 grown on graphene/cfp MoS x /Ni foam MoS 2 nanoparticles/carbon nanofiber foam MoS 2 /CPs MoS 2 /vertical graphene on CC S-10

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