CNT Hydrogen Storage Brief

Hydrogen Storage and Concepts: Focus on CNTs Tram Dang Daniel Estrada Scott Maghy Andy Zelinski

What are CNTs? ,[object Object],[object Object],[object Object],[object Object],[1] B. Bhushan, Springer handbook of nanotechnology , 2 nd ed. (Springer, 2006), pp. 44-47. [2] D. Qian, G.J. Wagner, W.K. Liu, M.F. Yu, R.S. Ruoff, “Mechanics of carbon nanotubes,” Appl. Mech. Rev. 55 (6), 495 (2002).

CNT variations [3] D. Qian, G.J. Wagner, W.K. Liu, M.F. Yu, R.S. Ruoff, “Mechanics of carbon nanotubes,” Appl. Mech. Rev. 55 (6), 495 (2002). [4] R. Andrews, D. Jacques, A.M. Rao, F. Derbyshire, D. Qian, X. Fan, E.C. Dickey, J. Chen, “Continuous production of aligned carbon nanotubes: a step closer to commercial realization,” Chem. Phys. Let. 303 , 467-474 (1999). [3] [4]

Why CNTs? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[5] P. Barbaro, C. Bianchini, Catalysis for Sustainable Energy Production (Wiley-VCH, 2009) pp. 123-124. [6] J. Li, T. Furuta, H. Goto, T. Ohashi, Y. Fujiwara, S. Yip, “Theoretical evaluation of hydrogen storage capacity in pure carbon nanostructures,” Journ. Of Chem. Phys. 119 (4), 2376-2385 (2003).

Economics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[7] J. Robertson, “Realistic application of CNTs,” Materials Today 7 (10), 46-52 (2004). [8] Cheaptubes.com: The Source for Low Carbon Nanotubes Prices, http://www.cheaptubes.com/carbon-nanotubes-prices.htm#Single_Walled_Nanotubes_Prices#ixzz0HDWX1APi&A http://www.cheaptubes.com/carbon-nanotubes-prices.htm#Single_Walled_Nanotubes_Prices (2009)

Chemisorption of SWNT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chemisorption of SWNT ,[object Object],[object Object],Demonstrates a decrease of intensity of π * from unsaturated C-C bonds in walls of SWNT and an increase in the σ * and C-H* resonance due to hydrogenation.

Chemisorption of SWNT ,[object Object],Hydrogenation causes formation of “shoulder” in spectrum, which is attributed to hydrogenated Carbon atoms. Based on intensity ratio of the two peaks and theoretical calculations, the amount of hydrogenated Carbon atoms was estimated to be 5.1 +/- 1.2 wt. % of SWNT. (close to 6.5%!) Found to be stable at ambient; breaks up completely by 600º C  reverseable process. Theoretical values of the carbon 1s core-level chemical shifts between sp-2 and sp-3 due to C-H bond formation for SWNTs. Measured results correspond well with calculations!

Chemisorption of SWNT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Chemisorption of SWNT Limitations ,[object Object],[object Object],[object Object]

Kinetics Considerations ,[object Object],So at room temperature, activation energy needs to be ~ 0.7eV . -This could be a fundamental problem: H ₂ binding energy ~4.7eV. H-H bond needs to be broken for Chemisorption to occur.

Kinetics Considerations ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

CNT Hydrogen Storage Brief

Recommandé

Recommandé

Contenu connexe

Tendances

Tendances (20)

Similaire à CNT Hydrogen Storage Brief

Similaire à CNT Hydrogen Storage Brief (20)

Plus de Andy Zelinski

Plus de Andy Zelinski (9)

CNT Hydrogen Storage Brief