Sodium alanate hydrogen storage system for automotive fuel cells
- 作者：R.K. Ahluwalia
- 关键词：Hydrogen storage systems ; Metal hydrides ; Sorption kinetics
- 刊名：International Journal of Hydrogen Energy
- 出版年：2007
- 期刊代码：42_03603199
- 类别：ch
- 出版时间：June 2007
- 卷：32
- 期：9
- 页码：1251-1261
- 文件大小：533 K
摘要
Suitability of Ti-catalyzed sodium alanate as a reversible hydrogen storage system for automotive polymer–electrolyte fuel cells has been assessed under the constraint that it must meet certain performance criteria with respect to the amount of recoverable <a name="mml83"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml83&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=f8a5100bb711fece25c3081883acaf2e" title="Click to view the MathML source">H2 needed for vehicle driving range, minimum full-flow of <a name="mml84"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml84&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=600b651dc6280a571017d138391de926" title="Click to view the MathML source">H2 needed to satisfy vehicular power demands, maximum refueling time and minimum <a name="mml85"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml85&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=8a20fe708cdb6b3c088cb309623c15d6" title="Click to view the MathML source">H2 delivery pressure. It is assumed that the thermal energy for desorbing hydrogen is supplied by the fluid that cools the high-temperature membrane fuel cell stack operating at <a name="mml86">. It is found that a ten-fold enhancement in published desorption kinetics is needed to attain 90%reversible <a name="mml87"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml87&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=16f5c3383ed80478db4d506890b0c80c" title="Click to view the MathML source">H2 storage capacity while satisfying the minimum full-flow requirement of 0.02 g <a name="mml88"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml88&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=8ffc9350d2e36fa1c0b44306630e11cd" title="Click to view the MathML source">H2/kWe. The catalyzed medium needs a metal foam support to facilitate heat removal necessary for 0.5–1.5 kg/min <a name="mml89"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml89&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=1f36c1dd5ad81061b45db9c43badc22a" title="Click to view the MathML source">H2 refueling rate. The faster the refueling rate, the higher is the peak heat transfer rate and the lower is the amount of recoverable <a name="mml90"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml90&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=907c738f6f2498a23293a85cff6d8fde" title="Click to view the MathML source">H2. For a system with 5.6 kg recoverable <a name="mml91"><a style="text-decoration:none; color:black" href="/science?_ob=MathURL&_method=retrieve&_udi=B6V3F-4M33VW0-2&_mathId=mml91&_user=10&_cdi=5729&_rdoc=15&_acct=C000050221&_version=1&_userid=10&md5=1b8f5a9b611d409b6118261d059d5b0b" title="Click to view the MathML source">H2, the peak heat transfer rate during refueling can exceed 1 MW. The overall specific energy and energy density of the storage medium are functions of the packing density of the metal hydride powder. The minimum acceptable hydrogen delivery pressure from the storage device determines the hydrogen storage capacity but otherwise has small influence on sorption kinetics.