Waseda University · 재료과학
Nobuko Hanada 교수의 연구실은 수소 저장 및 수소 생성 기술에 초점을 맞춘 고성능 나노소재 개발을 주요 연구 분야로 삼고 있습니다. 메탈 하이드라이드와 같은 고체 수소 저장 재료의 거칠기 및 반응성 향상을 위해 나노입자 도핑, 산화물 첨가, 고체상 반응 조건 최적화 등을 통해 수소의 탈착 특성과 가역성을 향상시키는 데 기여하고 있습니다. 또한 액체 암모니아를 이용한 수소 전기화학적 생성 기술을 통해 고순도 수소의 효율적 생산 가능성을 탐색하고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
We examined the catalytic effect of nanoparticle 3d-transition metals on hydrogen desorption (HD) properties of MgH(2) prepared by mechanical ball milling method. All the MgH(2) composites prepared by adding a small amount of nanoparticle Fe(nano), Co(nano), Ni(nano), and Cu(nano) metals and by ball milling for 2 h showed much better HD properties than the pure ball-milled MgH(2) itself. In particular, the 2 mol % Ni(nano)-doped MgH(2) composite prepared by soft milling for a short milling time
The thermal decomposition steps of Mg(BH4)2 were investigated under He flow and various hydrogen pressures up to 50 bar. In a He flow, the main decomposition of Mg(BH4)2 occurs between 250 and 410 °C until 12.2 mass% is lost, with three main peaks of hydrogen desorption. In the first decomposition step the crystalline phase of Mg(BH4)2 disappears while a small amount of Mg is detected in the XRD profile. However, the major part of the sample is in an amorphous state. After the second step, cryst
Hydrogen gas is generated by the electrolysis of liquid ammonia which has high hydrogen capacity of 17.8 mass%. The metal amides are used as supporting electrolytes to dissolve the amide ion in liquid ammonia. The results presented here indicate that liquid ammonia is promising as an energy medium for hydrogen storage and generation.
A valence state and a local structure of transition metals (Nb, V, and Ti) in MgH2 doped with metal oxides (Nb2O5, V2O5, and TiO2nano) by ball milling were examined by X-ray absorption spectroscopy (XAS). The main edge regions of the Nb, V, and Ti K-edges in the X-ray absorption near edge structure (XANES) profiles are located between 0 and +5 in the oxidation states. Since these spectra coincide with those of NbO, VO, and Ti2O3, respectively, the additives are reduced by MgH2 to the metal oxide
