九州大学カーボンニュートラル・エネルギー国際研究所（I²CNER)水素貯蔵研究部門 Huaiyu Shao助教、熱科学研究部門部門長髙田保之教授、同研究部門河野正道准教授、CO₂分離・転換研究部門部門長藤川茂紀准教授、同研究部門藤野沙誉子氏、燃料電池研究部門 Sean Bishop助教らの共同研究の成果が3月18日に『International Journal of Hydrogen Energy』 に掲載されました。この論文はI²CNERの研究者による異分野融合研究の成果といえます。

■ Outline

Mg-based hydrogen storage materials can be very promising candidates for stationary energy storage application due to the high energy density and low cost of Mg. Hydrogen storage kinetics and thermal conductivity are two important factors for the material development for this kind of application. Here we studied several types of Mg-based materials with different structure-micrometer scale Mg powders, Mg nanoparticles, single crystal Mg, nanocrystalline Mg₅₀Co₅₀ BCC alloy and Mg thin film samples. It seems the Mg materials with good kinetics usually are the ones with nanostructure and tend to show poor thermal conductivity due to electron/phonon scattering resulting from more interfaces and boundaries in nanomaterials. Based on this work, good crystallinity Mg phase incorporated in carbon nano framework could be one promising option for energy storage.

■ Paper

Title: Hydrogen storage and thermal conductivity properties of Mg-based materials with different structures

Authors: Huaiyu Shao, Weigang Ma, Masamichi Kohno, Yasuyuki Takata, Gongbiao Xin, Shigenori Fujikawa, Sayoko Fujino, Sean Bishop, Xingguo Li

DOI: 10.1016/j.ijhydene.2014.02.063

Article first published online: March 18, 2014