Molecular hydrogen carrier with activated nanohydride and ammonia
- PDF / 1,195,761 Bytes
- 6 Pages / 584.957 x 782.986 pts Page_size
- 32 Downloads / 208 Views
Kyoichi Tange and Satoshi Hino Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Shigehito Isobe and Masami Tsubota Institute for Advanced Materials Research ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Kosei Nakamura Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Masashi Nakatake Hiroshima Synchrotron Radiation Center, Hiroshima University, Higashi-Hiroshima 739-8526, Japan
Hiroki Miyaoka Institute for Advanced Materials Research ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Hikaru Yamamoto Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan
Takayuki Ichikawa Institute for Advanced Materials Research and Department of Quantum Matter, ADSM, Hiroshima University, Higashi-Hiroshima 739-8530, Japan (Received 8 January 2009; accepted 3 April 2009)
We show a drastically improved gas–solid reaction between NH3 and LiH by mechanical treatment for LiH, generating a hydrogen gas even at room temperature. The results of x-ray photoelectron spectroscopy showed that the mechanical pretreatment was effective in reducing a hydroxide phase from the surface of LiH. It was also possible to successfully recycle back LiNH2, which is the byproduct of this hydrogen desorption reaction, to LiH under 0.5-MPa H2 flow at 573 K. Thus, the LiH–NH3 system provides a recyclable H2 storage system to generate H2 at room temperature with 8.1 mass% and 4.5 kg/100 L hydrogen capacity.
I. INTRODUCTION
To commercialize H2-powered vehicles, a gravimetrically and volumetrically high H2 storage tank has to be developed, which should work under a moderate condition. It is necessary to have the storage tank of H2 to start the system on demand. H2 can be reversibly stored in tanks as compressed H2,1 liquefied H2,1 or by adsorption on carbon materials.1,2 Moreover, lightweight hydrides
a)
Address all correspondence to this author. e-mail: [email protected] This paper was selected as an Outstanding Symposium Paper for the 2007 MRS Fall Meeting, Symposium S. To maintain JMR’s rigorous, unbiased peer review standards, the JMR Principal Editor and reviewers were not made aware of the paper’s designation as Outstanding Symposium Paper. DOI: 10.1557/JMR.2009.0291 J. Mater. Res., Vol. 24, No. 7, Jul 2009
http://journals.cambridge.org
Downloaded: 15 Apr 2016
such as borohydrides,3,4 alanates,5 and metal–N–H composites6–10 also have a high H2 capacity and are being studied as advanced H2 storage materials. In fact, NaBH4 can provide 9.0 mass% of H2 by a hydrolysis reaction at room temperature.3,11 Particularly, NaBH4 and H2O seems to be regarded, respectively, as protide (H)-based hydride and proton (H+)-based hydride, indicating the interaction between H and H+ based materials causes H2 generation with sufficient kinetics. However, this system has a crucial problem with respect to the total energy efficiency, i.e., a high temperature >1800 K is needed to recycle back to NaBH4 and H2O
Data Loading...
