近期，我院本科生李自腾，教师张刘挺（通讯）等的研究成果“Crystal-amorphous interface synergy in Ni/CrV-Mixed Metal Oxide: A strategy for rapid hydrogen uptake/release in magnesium hydride”在《Journal of Magnesium and Alloys》(一区TOP，IF=13.8)上发表。
论文简介如下：
Optimizing the kinetics and lowering the ab/dehydrogenation temperature of magnesium hydride (MgH2) are crucial for hydrogen storage applications. The synergy among multi-metals (such as Ni, Cr, Fe, Cu, etc.) can reduce the ab/dehydrogenation activation energy of magnesium hydride by leveraging the characteristics of transition metals. Herein, Crystal-amorphous interfaces were regulated via changing the reducing atmosphere through precise design to form the semi-crystalline Ni/CrV-MMO catalysts. After the tests, the 10 wt%Ni/CrV-MMO-doped MgH2 initial hydrogen release at 190 °C and desorbed 5.6wt% H2 at a relatively low temperature of 275 °C within 10 min. Moreover, this composite material absorbed 5.7 wt% H2 within 2 min at 150 °C, achieving a remarkably low hydrogen absorption activation energy of only 28.75 kJ·mol-1, which is far below pure MgH2 (68.42 kJ·mol-1). Mechanistic studies and density functional theory (DFT) reveal that the amorphous CrV-MMO elevates the d-band center of Ni by contacting with the Ni interface, which contributes to the formation of in-situ generated Mg2Ni/Mg2NiH4, and the existence of crystal-amorphous interfaces effectively optimizes the transport of interfacial charges. This crystal-amorphous interface synergy strategy offers a general blueprint for low-temperature, high-rate MgH2 storage systems.
链接：https://www.sciencedirect.com/science/article/pii/S2213956726000721
