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成果報告書詳細
管理番号20170000000458
タイトル*平成28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2017/6/7
報告書年度2016 - 2016
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-FY2017) FY2016 Annual Report

1) Maximization of hydrogen storage by both physisorption and spillover mechanism for Pt-loaded zeolite templated carbon (ZTC)
We have already reported that Pt-clusters with a size of less than 1 nm can be finely dispersed on ZTC when an organometallic precursor, (COD)PtMe2 (COD = 1,5-cyclooctadiene) is used as a Pt-precursor and the Pt-loaded ZTC shows a large amount of hydrogen uptake due to the hydrogen spillover effect of Pt-clusters. However, the hydrogen adsorption experiments were carried out only below atmospheric pressure. In this year, we extend the hydrogen pressure range to 10 MPa (100 bar) and try to see if such a spillover effect still works under the high pressures. At first, by using (COD)PtMe2 as a Pt-precursor, we prepared Pt-loaded ZTC samples with different Pt-loadings such as 1.0, 3.0, 12.8 wt% and then measured their hydrogen uptakes under the high pressures. It is found that the Pt-loaded ZTC with the largest Pt-loading (12.8 wt%) shows less hydrogen uptake than the pristine ZTC sample because the specific surface area of the former is much smaller than that of the latter. On the other hand, the hydrogen storage amounts of the Pt-loaded ZTC samples with Pt-loadings of 1.0 and 3.0 wt% are larger than that of the pristine ZTC under the whole pressure range and, especially for the 1.0 wt%-loading sample, 23 % of the total hydrogen uptake can be derived from hydrogen spillover mechanism. Moreover, we have investigated the effect of adsorption temperature on hydrogen uptake under the high pressure and, as a result, the contribution of spillover mechanism to the total hydrogen uptake can be estimated to be as large as 34 % for the 1.0 wt%-loading sample.

2) Hydrogen storage in porous carbons doped with inexpensive metals
Considering the 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 inexpensive metals. We have found that it is possible to disperse very small Ni clusters (< 1 nm) in ZTC by using nickelocene as a Ni source. The resulting Ni/ZTC shows enhanced hydrogen uptake below atmospheric pressure, because of spillover induced by the presence of Ni clusters. In this year, we have further investigated the spillover effect of Ni clusters under high hydrogen pressures up to 10 MPa (100 bar), using not only ZTC but also MSC30. As a result of the high pressure adsorption experiment, we have found that both Ni-loaded ZTC and MSC30 don’t show any remarkable spillover effect under the high pressures.
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