成果報告書詳細
管理番号20160000000403
タイトル*平成27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 (国立大学法人東北大学)
公開日2016/9/7
報告書年度2015 - 2015
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) FY2015 Annual Report

1) 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. We have found that it is possible to disperse very small Ni clusters (< 1 nm) in zeolite-templated carbon by using a Ni-containing organic complex as a Ni source. The resulting Ni/ZTC material exhibits H2 chemisorption even at room temperature and also shows enhanced hydrogen uptake because of spillover. In this year, we have further investigated the mechanism of the spillover storage in this material by means of in situ X-ray absorption fine structure. It is found that when the Ni-containing organic complex is adsorbed on ZTC, Ni is oxidized to be almost the same state as Ni in NiO. Moreover, by a heat treatment, Ni is slightly reduced to be a very specific condition which is different from any known Ni species. Thus, it is found that the Ni/ZTC which exhibits H2 chemisorption as well as enhanced hydrogen uptake is in a very unique state. Interestingly, when the sample is exposed to air, Ni is oxidized to be the same condition as that of the precursor-loaded ZTC before heat-treatment.

2) High-pressure hydrogen storage
We have shown that Pt-cluster (the size is less than 2 nm) is very active to hydrogen spillover. We have prepared Pt-cluster loaded Ketjen black (Pt/KB) and its hydrogen storage at 25/50 °C was examined up to 10 MPa previously. However, the previous measurement suffered from leaking and precise data could not be obtained. In this year, we establish a reliable protocol which arrows to obtain reliable data. Thus, we confirm enhanced hydrogen uptake in Pt/KB even at very high pressure region up to 10 MPa. However, the temperature effect was found to be opposite to the case at a low pressure below 0.1 MPa. At high pressure, spillover storage amount is decreased with increasing temperature.
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