Chemistry:Siegenite

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Siegenite
Siegenite-261468.jpg
Siegenite from Buick mine, Bixby, Viburnum Trend District, Iron County, Missouri, USA
General
CategorySulfide mineral
Thiospinel group
Spinel structural group
Formula
(repeating unit)		(Ni,Co)
3S
4
Strunz classification2.DA.05
Crystal systemCubic
Crystal classm3m
Space groupFd3m (#227)
Unit cella = 9.33 Å; V = 810.94Å3
Identification
Formula mass304.3 - 305 g/mol
ColorLight to steel-grey, violet-gray (tarnished)
Crystal habitAs octahedral crystals, granular, massive
TwinningOn {111}; polysynthetic
CleavageImperfect on {001}
FractureIrregular to uneven, sub-conchoidal
Mohs scale hardness4.5 - 5.5
|re|er}}Metallic
StreakGrayish black
DiaphaneityOpaque
Density4.5 - 4.8 g/cm3 (Measured) 4.83 g/cm3 (Calculated)
References[1][2][3]

Siegenite (also called grimmite, or nickel cobalt sulfide) is a ternary transition metal dichalcogenide compound with the chemical formula (Ni,Co)3S4. It has been actively studied as a promising material system for electrodes in electrochemical energy applications due to its better conductivity, greater mechanical and thermal stability, and higher performance compared to metal oxides currently in use.[5] Potential applications of this material system include supercapacitors, batteries, electrocatalysis, dye-sensitized solar cells, photocatalysis, glucose sensors, and microwave absorption.[6]

In synthetic chemistry, a range of chemical compositions with the formula NixCo3-xS4 (0 < x < 3) are often referred to as the siegenite system. However, according to the new IMA list of minerals (updated November 2022), the normal spinel NiCo2S4 is called grimmite, the inverse spinel CoNi2S4 is called siegenite, and the endmembers Ni2+(Ni3+)2S4 and Co2+(Co3+)2S4 are called polydymite and linnaeite, respectively.[7] In 2020, NiCo2S4 (grimmite) is approved as a valid mineral species by the IMA.[8]

Discovery and occurrence

Siegenite was first described in 1850 for an occurrence in the Stahlberg Mine in Müsen, Siegerland, North Rhine-Westphalia, Germany and named for the locality.[1] It occurs in hydrothermal copper-nickel-iron sulfide bearing veins associated with chalcopyrite, pyrrhotite, galena, sphalerite, pyrite, millerite, gersdorffite and ullmannite.[2]

It occurs in a variety of deposits worldwide, including Brestovsko in the central Bosnian Mountains of Serbia; at Kladno in the Czech Republic; Blackcraig, Kirkcudbrightshire, Scotland. In the United States occurrences include the Mine la Motte of Madison County and the Buick mine, Bixby, Iron County and in the Sweetwater mine of Reynolds County in the Lead Belt of Missouri. In Canada, it is known from the Langis mine, Cobalt-Gowganda area, Ontario. In Africa it occurs at Shinkolobwe, Katanga Province and Kilembe, Uganda. In Japan, it is reported from the Kamaishi mine, Iwate Prefecture, and the Yokozuru mine, north Kyushu. It also occurs at Kalgoorlie, Western Australia.[2] It is found at the Browns deposit, Batchelor, Northern Territory, Australia .[1]

Crystal structure

Conventional unit cell of NiCo2S4 looking down at the [100] direction. Gray atoms are Ni, blue atoms are Co, and yellow atoms are S.

Siegenite is a member of the thiospinel group, which belongs to the cubic space group [math]\displaystyle{ Fd\bar{3}m }[/math] (#227) and has the Pearson symbol [math]\displaystyle{ cF56 }[/math]. Similar to normal spinels, a normal thiospinel unit cell consists of eight FCC sub unit cells of two different types, where S2- anions occupy all the FCC lattice points. The first type of sub unit cell has 2+ cations occupying 2 of the 8 tetrahedral sites and 3+ cations occupying 3/2 of the 4 octahedral sites. The second type of sub unit cell has only 3+ cations occupying 5/2 of the 4 octahedral sites. These two types of sub unit cells are alternatively stacked, forming a NaCl-type superstructure.

For a normal thiospinel (NiCo2S4), Ni2+ cations occupy 1/8 of the tetrahedral sites to form NiS4 tetrahedra and Co3+ cations occupy 1/2 of the octahedral sites to form CoS6 octahedra. Each tetrahedron shares corners with 12 neighboring octahedra, and each octahedron shares corners with 6 tetrahedra and edges with 6 octahedra. For an inverse thiospinel (CoNi2S4), Ni2+ occupy 1/8 of the octahedral sites and Co3+ occupy 1/4 of the tetrahedra sites and 1/4 of the octahedral sites. For a mixed/complex thiospinel, both metal ions occupy tetrahedral and octahedral sites and can be expressed as (AxB1-x)Td[A2-xBx]OhX4 (0 < x < 1), where A and B are metal ions, x is the degree of inversion, and [math]\displaystyle{ T_d }[/math] and [math]\displaystyle{ O_h }[/math] denote the tetrahedral and octahedral sites, respectively.

The powder X-ray diffraction (XRD) pattern of siegenite exhibits strong diffraction signals between 20° and 60° 2θ angles. The lattice constant of siegenite is measured to be 9.319 Å based on the strongest reflection at around 32°, corresponding to lattice plane (311), which agrees with the calculated lattice constant of 9.325 Å.[9][10]

Electronic properties

Unlike many binary and ternary semiconductor oxides, NiCo2S4 exhibits metallic properties and high electrical conductivity, which makes it useful as an electrode material in energy storage devices. The resistivity of NiCo2S4 is ~103 μΩ cm at room temperature and its temperature coefficient of resistivity is positive and stays constant between 40 K and 300 K, which is indicative of a metallic compound.[9] NiCo2S4 also has a very low Seebeck coefficient of 5 μV K–1 and a carrier density of 3.18 × 1022 cm−3 higher than that of silver.[9]

Synthesis

Reported synthetic routes of nickel cobalt sulfide include hydrothermal[11][12] and solvothermal[13] reactions, solvent-free thermal decomposition of xanthates,[14] SILAR method for thin films,[15] and solution-phase organometallic synthesis.[16] The hydrothermal reaction is the most widely used synthesis method to fabricate intricate nanostructures on highly porous substrates, yielding hierarchical structures that maximize redox-active surface areas and promote high-rate supercapacitive performance of Ni-Co-S-based electrodes.

Applications

Batteries and supercapacitors

(Ni,Co)3S4 is a promising electrode material for batteries and supercapacitors. Since the electronegativity of sulfur is lower than that of oxygen, (Ni,Co)3S4 has a more flexible lattice compared to its oxide counterpart, which allows easier electron and ion transport through the structure.[17] Its high ionic conductivity can be attributed to the abundance of available cation sites in the thiospinel structure, and its high redox activity comes from the highly electrochemically active Ni2+/Ni3+ and Co2+/Co3+ redox couples. In literatures, nanoporous Ni-Co-S composite materials have been shown to have both high specific capacity in Li-based batteries and high capacitance in supercapacitors.[6]

Electrocatalysis

(Ni,Co)3S4 has been considered as an alternative electrocatalyst for HER and OER reactions because of its high conductivity and low cost. It is reported that a overpotential of 87 mV for HER and 251 mV for HER can be achieved using NiCo2S4-based electrode, showing good potential for water splitting applications.[6]

References

  1. ↑ 1.0 1.1 1.2 Mindat.org - Siegenite
  2. ↑ 2.0 2.1 2.2 Handbook of Mineralogy - Siegenite
  3. ↑ Webmineral.com - Siegenite
  4. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W. https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A. 
  5. ↑ "Metal Sulfides for Better Energy Storage" (in en). 2020-08-20. https://research.cornell.edu/research/metal-sulfides-better-energy-storage. 
  6. ↑ 6.0 6.1 6.2 Xue, Gaofei; Bai, Tian; Wang, Weiguo; Wang, Senjing; Ye, Meidan (2022-04-12). "Recent advances in various applications of nickel cobalt sulfide-based materials" (in en). Journal of Materials Chemistry A 10 (15): 8087–8106. doi:10.1039/D2TA00305H. ISSN 2050-7496. https://pubs.rsc.org/en/content/articlelanding/2022/ta/d2ta00305h. 
  7. ↑ "List of Minerals" (in en). 2011-03-21. https://mineralogy-ima.org/Minlist.htm. 
  8. ↑ Škácha, Pavel; Sejkora, Jiří; Plášil, Jakub; Dolníček, Zdeněk; Ulmanová, Jana (2021-04-19). "Grimmite, NiCo2S4, a new thiospinel from Příbram, Czech Republic" (in English). European Journal of Mineralogy 33 (2): 175–187. doi:10.5194/ejm-33-175-2021. ISSN 0935-1221. https://ejm.copernicus.org/articles/33/175/2021/. 
  9. ↑ 9.0 9.1 9.2 Xia, Chuan; Li, Peng; Gandi, Appala Naidu; Schwingenschlögl, Udo; Alshareef, Husam N. (2015-10-13). "Is NiCo 2 S 4 Really a Semiconductor?" (in en). Chemistry of Materials 27 (19): 6482–6485. doi:10.1021/acs.chemmater.5b01843. ISSN 0897-4756. https://pubs.acs.org/doi/10.1021/acs.chemmater.5b01843. 
  10. ↑ "mp-22658: Co2NiS4 (Cubic, Fd-3m, 227)". https://materialsproject.org/materials/mp-22658. 
  11. ↑ Chen, Haichao; Jiang, Jianjun; Zhang, Li; Wan, Houzhao; Qi, Tong; Xia, Dandan (2013-09-13). "Highly conductive NiCo2S4 urchin-like nanostructures for high-rate pseudocapacitors" (in en). Nanoscale 5 (19): 8879–8883. doi:10.1039/C3NR02958A. ISSN 2040-3372. PMID 23903234. https://pubs.rsc.org/en/content/articlelanding/2013/nr/c3nr02958a. 
  12. ↑ Kumar, Subalakshmi; Sekar, Sankar; Kaliamurthy, Ashok Kumar; Lee, Sejoon (2021-05-01). "Bifunctional rGO-NiCo2S4 MOF hybrid with high electrochemical and catalytic activity for supercapacitor and nitroarene reduction" (in en). Journal of Materials Research and Technology 12: 2489–2501. doi:10.1016/j.jmrt.2021.04.001. ISSN 2238-7854. 
  13. ↑ Li, Zhong; Yuan, Daqing; Zhu, Shengyun; Fan, Ping; Ma, Hailiang; Zhang, Qiaoli; Wen, Ali; Zhu, Jiliang (2019-05-07). "The multi-structure NiCo2S4 prepared by solvothermal method for supercapacitor accompanied with positron annihilation study". Journal of Applied Physics 125 (17): 175103. doi:10.1063/1.5087981. ISSN 0021-8979. https://aip.scitation.org/doi/10.1063/1.5087981. 
  14. ↑ Khan, Malik Dilshad; Murtaza, Ghulam; Revaprasadu, Neerish; O'Brien, Paul (2018-07-10). "Synthesis of chalcopyrite-type and thiospinel minerals/materials by low temperature melts of xanthates" (in en). Dalton Transactions 47 (27): 8870–8873. doi:10.1039/C8DT00953H. ISSN 1477-9234. PMID 29916514. https://pubs.rsc.org/en/content/articlelanding/2018/dt/c8dt00953h. 
  15. ↑ Shinde, S. K.; Ramesh, Sivalingam; Bathula, C.; Ghodake, G. S.; Kim, D.-Y.; Jagadale, A. D.; Kadam, A. A.; Waghmode, D. P. et al. (2019-09-23). "Novel approach to synthesize NiCo2S4 composite for high-performance supercapacitor application with different molar ratio of Ni and Co" (in en). Scientific Reports 9 (1): 13717. doi:10.1038/s41598-019-50165-5. ISSN 2045-2322. PMID 31548661. 
  16. ↑ Feng, Xueting; Jiao, Qingze; Cui, Huiru; Yin, Mengmeng; Li, Qun; Zhao, Yun; Li, Hansheng; Zhou, Wei et al. (2018-09-05). "One-Pot Synthesis of NiCo 2 S 4 Hollow Spheres via Sequential Ion-Exchange as an Enhanced Oxygen Bifunctional Electrocatalyst in Alkaline Solution" (in en). ACS Applied Materials & Interfaces 10 (35): 29521–29531. doi:10.1021/acsami.8b08547. ISSN 1944-8244. PMID 30102862. https://pubs.acs.org/doi/10.1021/acsami.8b08547. 
  17. ↑ Park, Sang Ho; Sun, Yang-Kook; Park, Ki Soo; Nahm, Kee Suk; Lee, Yun Sung; Yoshio, Masaki (2002-03-20). "Synthesis and electrochemical properties of lithium nickel oxysulfide (LiNiSyO2−y) material for lithium secondary batteries" (in en). Electrochimica Acta 47 (11): 1721–1726. doi:10.1016/S0013-4686(02)00023-3. ISSN 0013-4686. https://www.sciencedirect.com/science/article/pii/S0013468602000233. 



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