Carbon-encapsulated heazlewoodite nanoparticles as highly efficient and durable electrocatalysts for oxygen evolution reactions

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1 Electronic Supplementary Material Carbon-encapsulated heazlewoodite nanoparticles as highly efficient and durable electrocatalysts for oxygen evolution reactions Mohammad Al-Mamun 1, Huajie Yin 1, Porun Liu 1, Xintai Su 1,2, Haimin Zhang 3, Huagui Yang 1, Dan Wang 1, Zhiyong Tang 1, Yun Wang 1 ( ), and Huijun Zhao 1,3 ( ) 1 Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus QLD 4222, Australia 2 Ministry Key Laboratory of Oil and Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi , China 3 Centre for Environmental and Energy Nanomaterials, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei , China Supporting information to DOI /s x Figure S1 Digital photographs taken at the different stages of Ni 3 S nanocomposite fabrication. Address correspondence to Yun Wang, yun.wang@griffith.edu.au; Huijun Zhao, h.zhao@griffith.edu.au

2 Nano Res. Figure S2 SEM images of the samples prepared at (a) 500, (b) 600, (c) 800, and (d) 900 C under the same experimental conditions. Figure S3 Nitrogen adsorption desorption isotherm of Ni3S2@C/CNS nanocomposite. Figure S4 SEM image of the pristine CNS sample prepared at 700 C displaying the thickness of ~10 nm.

3 Figure S5 EDS results of the Ni 3 S nanocomposite. Figure S6 XRD pattern of the samples prepared at 500, 600, 700, 800, and 900 C under Ar atmosphere. The peaks with * originated from the elemental sulfur species. Figure S7 (a) SEM image and (b) XRD pattern of Ni 3 S 2 prepared by the hydrothermal method and calcinated at 700 C under Ar atmosphere. Nano Research

4 Figure S8 Polarisation curves of the samples prepared at different pyrolysis temperatures from C. Figure S9 Cyclic voltammograms of (a) Ni 3 S 2 /CNS, (b) Ni 3 S 2, and (c) RuO 2 at different scan rates from 10 to 180 mv s 1 at the potential window of V (vs. RHE). Table S1 A partial literature summary of the OER performances of nickel sulfide catalysts tested in 1.0 M KOH electrolyte Catalyst η@10 ma cm 2 Onset potential (V vs. RHE) Tafel slope (mv dec 1 ) Mass loading (mg cm 2 ) Substrate Fe 0.1 -NiS 2 /Ti 231 (a) ~ Ti [S1] Fe 11.8% -Ni 3 S 2 /NF 253 (a) ~ Ni foam [S2] Ni 3 S 2 /NF 260 ~ Ni foam [S3] Ni 3 S 298 ~ GCE This work Ni 3 S 2 /NF 300 ~ Ni foam [S4] MoO x /Ni 3 S (a) ~ Ni foam [S5] NiS 320 ~ FTO [S6] Ref.

5 (Continued) Catalyst ma cm 2 Onset potential (V vs. RHE) Tafel slope (mv dec 1 ) Mass loading (mg cm 2 ) Substrate Ref. NiS ~335 (a) ~ Ni foam [S7] Ni 3 S 340 ~ Ni foam [S8] Ni 9 S (b) ~ Ni foam [S9] NiS x 353 ~ GCE [S10] NiO-NiS/N-C 374 ~ CFP [S11] Ni 3 S 390 ~ GCE [S12] NiS@N/S-C 417 ~ CFP [S13] NGC@Co 4 S 3 /Ni x S (c) ~ GCE [S14] Corresponding overpotentials at (a) 100, (b) 30, and (c) ma cm 2. References [S1] Yang, N.; Tang, C.; Wang, K. Y.; Du, G.; Asiri, A. M.; Sun, X. P. Iron-doped nickel disulfide nanoarray: A highly efficient and stable electrocatalyst for water splitting. Nano Res. 2016, 9, [S2] Cheng, N. Y.; Liu, Q.; Asiri, A. M.; Xing, W.; Sun, X. P. A Fe-doped Ni 3 S 2 particle film as a high-efficiency robust oxygen evolution electrode with very high current density. J. Mater. Chem. A 2015, 3, [S3] Feng, L. L.; Yu, G. T.; Wu, Y. Y.; Li, G. D.; Li, H.; Sun, Y. H.; Asefa, T.; Chen, W.; Zou, X. X. High-index faceted Ni 3 S 2 nanosheet arrays as highly active and ultrastable electrocatalysts for water splitting. J. Am. Chem. Soc. 2015, 137, [S4] Sivanantham, A.; Ganesan, P.; Shanmugam, S. Hierarchical NiCo 2 S 4 nanowire arrays supported on Ni foam: An efficient and durable bifunctional electrocatalyst for oxygen and hydrogen evolution reactions. Adv. Funct. Mater. 2016, 26, [S5] Wu, Y. Y.; Li, G. D.; Liu, Y. P.; Yang, L.; Lian, X. R.; Asefa, T.; Zou, X. X. Overall water splitting catalyzed efficiently by an ultrathin nanosheet-built, hollow Ni 3 S 2 -based electrocatalyst. Adv. Funct. Mater. 2016, 26, [S6] Mabayoje, O.; Shoola, A.; Wygant, B. R.; Mullins, C. B. The role of anions in metal chalcogenide oxygen evolution catalysis: Electrodeposited thin films of nickel sulfide as pre-catalysts. ACS Energy Lett. 2016, 1, [S7] Zhu, W. X.; Yue, X. Y.; Zhang, W. T.; Yu, S. X.; Zhang, Y. H.; Wang, J.; Wang, J. L. Nickel sulfide microsphere film on Ni foam as an efficient bifunctional electrocatalyst for overall water splitting. Chem. Commun. 2016, 52, [S8] Zhu, T.; Zhu, L. L.; Wang, J.; Ho, G. W. In situ chemical etching of tunable 3D Ni 3 S 2 superstructures for bifunctional electrocatalysts for overall water splitting. J. Mater. Chem. A 2016, 4, [S9] Chen, G. F.; Ma, T. Y.; Liu, Z. Q.; Li, N.; Su, Y. Z.; Davey, K.; Qiao, S. Z. Efficient and stable bifunctional electrocatalysts Ni/Ni x M y (M = P, S) for overall water splitting. Adv. Funct. Mater. 2016, 26, [S10] Li, H.; Shao, Y. D.; Su, Y. T.; Gao, Y. H.; Wang, X. W. Vapor-phase atomic layer deposition of nickel sulfide and its application for efficient oxygen-evolution electrocatalysis. Chem. Mater. 2016, 28, [S11] Gao, M. G.; Yang, L.; Dai, B.; Guo, X. H.; Liu, Z. Y.; Peng, B. H. A novel Ni-Schiff base complex derived electrocatalyst for oxygen evolution reaction. J. Solid State Electrochem. 2016, 20, [S12] Barman, B. K.; Nanda, K. K. A noble and single source precursor for the synthesis of metal-rich sulphides embedded in an N-doped carbon framework for highly active OER electrocatalysts. Dalton Trans. 2016, 45, [S13] Yang, L.; Gao, M. G.; Dai, B.; Guo, X. H.; Liu, Z. Y.; Peng, B. H. An efficient NiS@N/S-C hybrid oxygen evolution electrocatalyst derived from metal-organic framework. Electrochim. Acta 2016, 191, [S14] Ma, X. X.; He, X. Q. Co 4 S 3 /Ni x S 6 (7 x 6)/NiOOH in situ encapsulated carbon-based hybrid as a high-efficient oxygen electrode catalyst in alkaline media. Electrochim. Acta 2016, 213, Nano Research

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