Sodium silicide

Sodium silicide (NaSi, Na4Si4) is a binary inorganic compound consisting of sodium and silicon. It is a solid black or grey crystalline material.[1] It can be synthesized by melting sodium or a sodium-potassium alloy with finely powdered silica gel. Temperature control of the reaction determine the final product's reactivity; heating above 400 °C creates an air-stable and less reducing product, while the product produced at room temperature is a pyrophoric and highly moisture-sensitive powder.[2]

Sodium silicide's empirical formula (NaSi) is deceptive, as it is a Zintl phase: instead of containing discrete Si− anions, it contains Si4−
4 tetrahedra, which leads to the more descriptive formula Na4Si4. These silicon tetrahedra condense into various crosslinked silicon polymers at high pressure.[3]

Sodium silicide reacts readily with water yielding gaseous hydrogen and aqueous sodium silicate in an exothermic reaction (~175 kJ·mol−1):[4]

2 NaSi + 5 H2O → 5 H2 \+ Na2Si2O5

This is used in hydrogen technologies to generate hydrogen as a fuel. It is also used as high energy dense storage for hydrogen under low pressure.[5]

## See also

* Silicide
* Binary compounds of silicon

## External links

* SiGNa Chemistry, Inc.

## References

1. ↑ Material Safety Data Sheet, SiGNa Chemistry, Inc.
2. ↑ Dye, J. L., Cram, K. D., Urbin, S. A., Redko, M. Y., Jackson, J. E., & Lefenfeld, M. (2005). Alkali Metals Plus Silica Gel: Powerful Reducing Agents and Convenient Hydrogen Sources. Journal of the American Chemical Society, 127(26), 9338–9339. https://doi.org/10.1021/ja051786+
3. ↑ Cabrera, R. Q., Salamat, A., Barkalov, O. I., Leynaud, O., Hutchins, P., Daisenberger, D., Machon, D., Sella, A., Lewis, D. W., & McMillan, P. F. (2009). Pressure-induced structural transformations of the Zintl phase sodium silicide. Journal of Solid State Chemistry, 182(9), 2535–2542. https://doi.org/10.1016/j.jssc.2009.06.037
4. ↑ Hydrogen Production from Sodium Silicide Powder; Prospects for On-Board Generation, 14 July 2006
5. ↑ "Silicide-Based Hydrogen Generation for Back-Up Power and Portable Fuel Cells". July 2013. http://www.signachem.com/wp-content/uploads/2015/06/3.1_NaSi-White-Paper-WEB1.pdf.

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Sodium compounds

* NaAlO2
* NaBH4
* NaBH3(CN)
* NaBO2
* NaBiO3
* NaBr
* NaBrO
* NaBrO3
* NaCH3COO
* NaC6H5CO2
* NaC6H4(OH)CO2
* NaCN
* NaCl
* NaClO
* NaClO2
* NaClO3
* NaClO4
* NaF
* Na2FeO4
* NaH
* NaHCO3
* NaH2PO4
* NaHSO3
* NaHSO4
* NaI
* NaIO3
* NaIO4
* Na5IO6
* NaMnO4
* NaN3
* NaNH2
* NaNO2
* NaNO3
* NaOCN
* NaO2
* NaO3
* NaOH
* NaPO2H2
* NaReO4
* NaSCN
* NaSH
* NaTcO4
* NaVO3
* Na2CO3
* Na2C2O4
* Na2CrO4
* Na2Cr2O7
* Na2GeO3
* Na2MnO4
* Na3MnO4
* Na2MoO4
* Na2MoS4
* Na2N2O2
* Na2O
* Na2O2
* Na2O(UO3)2
* Na2PO3F
* Na2S
* Na2SO3
* Na2SO4
* Na2S2O3
* Na2S2O4
* Na2S2O5
* Na2S2O6
* Na2S2O7
* Na2S2O8
* Na2S4O6
* Na2Se
* Na2SeO3
* Na2SeO4
* Na2SiO3
* Na2Si2O5
* Na4SiO4
* Na2Te
* Na2TeO3
* Na2TeO4
* Na2Po
* Na2Ti3O7
* Na2U2O7
* Na2WO4
* Na2Zn(OH)4
* Na3N
* Na3P
* Na3PO4
* Na3VO4
* Na4Fe(CN)6
* Na4P3O7
* Na5P3O10

Chemical formulas

Template:Silicides

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