Electronic Supplementary Material (ESI) for Materials Chemistry Frontiers. This journal is the Partner Organisations 2018 Supporting Information Well-aligned metal-organic framework array-derived CoS 2 nanosheets toward robust electrochemical water splitting Na Yao, Tan Tan, Fulin Yang, Gongzhen Cheng and Wei Luo* College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, Hubei 430072, P. R. China. Corresponding Author: E-mail: wluo@whu.edu.cn S1
Fig. S1 XRD patterns of Co(OH)F/CC; Fig. S2 XRD patterns of ZIF-67/CC; S2
Fig. S3 SEM images of Co(OH)F/CC(a), and ZIF-67/CC (b) S3
Fig. S4 SEM images of ZIF-67/CC for vulcanization 30 min (a); 60 min (b); 90 min (c); 120 min (d). S4
Fig. S5 XRD pattern and SEM image of CoS 2 NR/CC. Fig. S6 EDX spectrum of CoS 2 NS/CC S5
Fig. S7 (a) SEM images of NiS 2 NS/CC; (b) XRD pattern of NiS 2 NS/CC (PDF#11-0099) ; (c) SEM images of FeS 2 NS/CC; (e) XRD pattern of FeS 2 NS/CC (PDF#42-1340). S6
Fig. S8 (a) Cyclic voltammetries with for capacitive currents at 0.53 V as a function of scan rate in 1.0 M KOH for CoS 2 NS/CC and the Cdl of CoS 2 NS/CC by Linear fitting; (b) CoS 2 NR/CC;(c) ZIF-67/CC. S7
Fig. S9 (a) Cyclic voltammetries with for capacitive currents at -0.9 V as a function of scan rate in 1.0 M KOH and the C dl of CoS 2 NS/CC, (b) CoS 2 NR /CC, (c) ZIF-67/CC. S8
Fig. S10 SEM images of CoS 2 NS/CC after OER test. Fig. S11 XPS pattern of CoS 2 NS/CC after OER (a) Co 2p spectrum; (b) S 2p spectrum. (b) S9
Fig. S12 (a) SEM images of CoS 2 without carbon cloth; (b) SEM images of CoS 2 NS/CC; (c-d) LSV curves of CoS 2 NS/CC and CoS 2 without carbon cloth. S10
Fig. S13 Faraday efficiency of H 2 and O 2 production. S11
Table S1 Comparison of representative Co-based sulfide OER catalysts in alkaline electrolyte. Catalyst j (ma cm -2 ) η (mv) Reference 10 85 CoS 2 SN/CC This work 100 248 CoS 2 SL/CC 10 90 This work CoS 2 NTA/CC 10 193 1 P-Co Ni S/NF 100 284 2 N CoS2 NW/CC 10 152 3 CoS2@NSC/CFP 10 95 100 158 Ni 2.3% -CoS 2 /CC 100 231 5 NiCo 2 S 4 BHSs 1 90 6 10 134 Cu@CoSx/CF 7 100 267 NiCo 2 S 4 /Ni 3 S 2 /NF 10 119 8 Ni 3 S 2 nanorod/nf 10 200 9 Zn-Co-S/CFP 10 234 10 MoS 2 -Ni 3 S 2 HNRs/NF 10 98 11 Ni 3 S 2 /NF 10 223 12 NiS/NF 20 158 13 CoP/CC 10 110 14 S-NiFe 2 O 4 10 138 21 CoS 2 HNSs 10 193 15 4 S12
Table S2 Comparison of representative Co-based sulfide OER catalysts in alkaline electrolyte. Catalyst j (ma cm -2 ) η (mv) Reference CoS 2 SN/CC 10 220 This work 100 320 CoS 2 SL/CC 10 280 This work CoS 2 NTA/CC 10 276 1 Ni 2.3% -CoS 2 /CC 100 370 5 Cu@CoSx/CF 10 160 100 310 7 CoS 2 @NSC 10 470 16 Co 3 S 4 @ MoS 2 10 330 17 CuCo 2 S 4 10 310 18 N-CoS 2 /CC 10 240 19 CoS 2 HNSs 10 290 11 Ni 3 S 2 /NF 10 260 12 NiS/NF 50 335 13 S-NiFe 2 O 4 10 260 21 NiCo 2 (SOH)x 10 290 20 S13
Table S3 Comparison of representative Co-based sulfide water splitting catalysts in alkaline electrolyte. Catalyst j (ma cm -2 ) E (mv) Reference CoS 2 SN/CC-CoS 2 SN/CC 10 1.58 100 1.86 This work CoS 2 NTA/CC-CoS 2 NTA/CC 10 1.67 1 Ni 2.3% -CoS 2 /CC-Ni 2.3% -CoS 2 /CC 10 1.66 5 Cu@CoSx/CF-Cu@CoSx/CF 100 1.80 7 NiS/NF- NiS/NF 10 1.64 13 Ni 3 S 2 /NF- Ni 3 S 2 /NF 10 1.76 12 S-NiFe 2 O 4- S-NiFe 2 O 4 10 1.65 21 NiMoO 4 x/moo 2 -NiMoO 4 x/moo 2 10 1.56 22 CP/CT/Co-S- CP/CT/Co-S 10 1.68 23 foil/nico 2 O 4 -foil/nico2o4 10 1.73 24 NiCo 2 O 4 HM/NF-NiCo 2 O 4 HM/NF 10 1.65 25 Reference 1. S. Feng, X. Li, J. Huo, Q. Li, C. Xie, T. Liu, Z. Liu, Z. Wu and S. Wang, ChemCatChem, 2018, 10, 796; 2. F. Zhang, Y. Ge, H. Chu, P. Dong, R. Baines, Y. Pei, M. Ye and J. Shen, ACS Appl. Mater. Interfaces, 2018, 10, 7087; 3. P. Chen, T. Zhou, M. Chen, Y. Tong, N. Zhang, X. Peng, W. Chu, X. Wu, C. Wu, and Y. Xie, ACS Catal., 2017, 7, 7405; 4. S. Feng, X. Li, J. Huo, Q. Li, C. Xie, T. Liu, Z. Liu, Z. Wu and S. Wang, ChemCatChem, 2018, 10,796; 5. W. Fang, D. Liu, Q. Lu, X. Sun, A. M. Asiri, Electrochemistry Communications, 2016,63, 60; 6. Y. Jiang, X. Qian, C. Zhu, H. Liu, and L. Hou, ACS Appl. Mater. Interfaces 2018, 10, 9379; 7. Y. Liu, Q. Li, Rui Si, G.-D. Li, W. Li, D.-P. Liu, D. Wang, L. Sun, Y. Zhang and X. Zou, Adv. Mater. 2017, 29, 1606200; 8. H. Liu, X. Ma, Y. Rao, Yang Liu, J. Liu, L. Wang and M. Wu, ACS Appl. Mater. Interfaces, 2018, 10, 10890; 9. C. Ouyang, X.Wang, C. Wang, X. X. Zhang, J. H. Wu, Z. L. Ma, S. Dou, S. Y. Wang, Electrochim. Acta, 2015, 174, 297; 10. X. Wu, X. Han, X. Ma, W. Zhang, Y. Deng, C. Zhong and W. Hu, ACS Appl. Mater. Interfaces, 2017, 9, 12574; S14
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