Boron-carbon-nitrogen foam surfaces for thermal physisorption applications
Abstract
A surface chemical treatment of highly porous carbon foams was adopted to synthesize boron-carbon-nitrogen (B-C-N) foams for thermal energy storage and release using an adsorption/desorption cycle with lightweight hydrocarbons. Microwave treatment in boric acid and urea was used to modify carbon foams with a B-C-N surface. Depending on the initial carbon foam state, B-C-N surface layers were produced with both amorphous and crystalline structures. The resultant B-C-N foams were characterized by TEM, XPS, XRD, FESEM and Raman measurements to quantify their stoichiometry, structure, and morphology. Adsorption enthalpy with methanol and thermal stability of foams was analyzed with DSC and TGA respectively. Thermal conductivity was measured by a transient laser flash technique. Results indicate that the crystalline graphitic carbon foam produces superior B-C-N surfaces compared to amorphous carbon foam. The crystalline B-C-N foams are found to provide the highest adsorption capacity, better thermal and oxidation stability. (c) 2012 Elsevier B.V. All rights reserved.
Keywords
Porous carbon; Boron nitrogen doping; Desorption; Enthalpy; Thermal conductivity; X-RAY ELECTRON; ADSORPTION; CONDUCTIVITY; SPECTROSCOPY; BCN
DOI
10.1016/j.tsf.2012.08.059
Citation
Thin Solid Films Volume 528, 15 January 2013, Pages 187–193
Date of this Version
1-15-2013
Recommended Citation
Paul, Rajib; Voevodin, A. A.; Hu, J. J.; Amama, P. B.; Ganguli, S.; Roy, A. K.; Zemlyanov, Dmitry; and Fisher, Timothy S., "Boron-carbon-nitrogen foam surfaces for thermal physisorption applications" (2013). Birck and NCN Publications. Paper 1332.
http://dx.doi.org/10.1016/j.tsf.2012.08.059