Lesson plan
Siegenite
Siegenite (also called grimmite, or nickel cobalt sulfide) is a ternary transition metal dichalcogenide compound with the chemical formula (Ni,Co) 3 S 4 . 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. Potential applications of this material system include supercapacitors, batteries, electrocatalysis, dye-sensitized solar cells, photocatalysis, glucose sensors, and microwave absorption. In synthetic chemistry, a range of chemical compositions with the formula Ni x Co 3−x S 4 (0 2 S 4 is called grimmite, the inverse spinel CoNi 2 S 4 is called siegenite, and the endmembers Ni 2+ (Ni 3+ ) 2 S 4 and Co 2+ (Co 3+ ) 2 S 4 are called polydymite and linnaeite, respectively. In 2020, NiCo 2 S 4 (grimmite) is approved as a valid mineral species by the IMA.
Article summary
Siegenite (also called grimmite, or nickel cobalt sulfide) is a ternary transition metal dichalcogenide compound with the chemical formula (Ni,Co) 3 S 4 . 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. Potential applications of this material system include supercapacitors, batteries, electrocatalysis, dye-sensitized solar cells, photocatalysis, glucose sensors, and microwave absorption. In synthetic chemistry, a range of chemical compositions with the formula Ni x Co 3−x S 4 (0 2 S 4 is called grimmite, the inverse spinel CoNi 2 S 4 is called siegenite, and the endmembers Ni 2+ (Ni 3+ ) 2 S 4 and Co 2+ (Co 3+ ) 2 S 4 are called polydymite and linnaeite, respectively. In 2020, NiCo 2 S 4 (grimmite) is approved as a valid mineral species by the IMA.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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