成果報告書詳細
管理番号20140000000142
タイトル*平成25年度中間年報 水素利用技術研究開発事業 燃料電池自動車及び水素ステーション用低コスト機器・システム等に関する研究開発 燃料電池自動車用水素貯蔵材料に関する研究開発
公開日2014/5/2
報告書年度2013 - 2013
委託先名国立大学法人東北大学
プロジェクト番号P13002
部署名新エネルギー部
和文要約
英文要約Title : Development of hydrogen storage materials based on reversible adsorption (FY2013-FY2015) FY2013 Annual Report

1) Hydrogen storage in Pt-doped zeolite-templated carbon based on physisorption and spillover
A lot of research groups have investigated hydrogen storage based on physisorption and spillover. However, it is still difficult to reproduce data taken by the different research groups. This is due to very complicated mechanism of hydrogen spillover. In this work, we prepared a model Pt-doped carbon by very simple and highly reproducible method: an already prepared Pt-nanocolloid (particle size is 1 to 3 nm) was doped on zeolite-templated carbon (ZTC), which has 3D ordered structure. In addition, we carefully examined the technique for hydrogen adsorption-desorption measurement, and established a reliable protocol for the measurement below 0.1 MPa. Based on the data taken by such well-organized system, we can precisely extract the amount of hydrogen which is stored by spillover mechanism. It is found that spillover-based storage amount is increased with increasing temperature, in the range of 0 to 80 °C. Thus, the total hydrogen storage amount becomes the maximum at 80 °C despite the decrease of physisorption amount at higher temperature. Based on the storage amount at the low-pressure region, the storage amount at 34 MPa at 80 °C is roughly estimated below 4.0 wt%, still much lower than the target value (6 wt%) for practical use. Accordingly, the improvement of spillover-based storage is further necessary.
2) Study of hydrogen storage mechanism by direct adsorption of hydrogen radical on carbon
Since the spillover is consisting of several processes, it is generally difficult to precisely examine the sole effect of carbon structure on the spillover-based storage behavior. We therefore developed a new characterization system in which hydrogen (or deuterium) radical is directly adsorbed on carbon and temperature-programmed desorption (TPD) can be measured subsequently. By using highly oriented pyrolytic graphite, we confirmed a specific peak of D2 release around 400-600 °C after the D-radical adsorption. By using this system, it is possible to examine the effect of carbon structure on the hydrogen-radical storage and release.
3) Hydrogen storage in transition metal-doped carbons
Considering practical use of hydrogen storage materials, it is difficult to use Pt-loaded carbons due to the high price of Pt. Thus, it is highly required to develop hydrogen-storage materials by using much cheaper metals. In this work, we prepared Fe or Ni doped high-porous carbons. In the case of Fe-doping (2.5 wt%), very small particles (less than 1 nm) were very well dispersed in ZTC matrix. In the case of Ni-doping (3.2 wt%), particle size is a little larger (ca. 16 nm). Fe-doped ZTC showed almost no enhancement effect for hydrogen storage, whereas Ni-doped ZTC showed very similar behavior to that of Pt-loaded ZTC. The hydrogen storage amount in Ni-doped ZTC is comparable to that of Pt-loaded ZTC at 25 °C.
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