(哈爾濱工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，哈爾濱 150001)
摘 要: 在氫氣作為保護(hù)氣氛條件下，用機(jī)械合金化方法制備成Mg-Ni-Cr2O3納米晶復(fù)合物。該復(fù)合物具有很好的吸放氫性能，在球磨過程中能發(fā)生吸氫反應(yīng)，經(jīng)過較長時(shí)間球磨之后，基本能完成吸氫，其放氫溫度也有所降低。該復(fù)合材料充氫量在200℃可以于50s內(nèi)達(dá)到6.0%以上；在305℃，0.1MPa下，放氫量在500s內(nèi)可達(dá)到6.0%以上。對該復(fù)合物的熱力學(xué)性能進(jìn)行了研究，測出了PCT曲線及吸放氫的生成熱ΔH等數(shù)據(jù)，并分析了其吸放氫的機(jī)理。
關(guān)鍵字: 儲氫材料；Mg-Ni-Cr2O3納米復(fù)合物；吸放氫動(dòng)力學(xué)
of nanocrystalline composite of
Mg-Ni-Cr2O3
（School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China）
Abstract:The properties of hydriding and dehydriding of nanocrystalline composite of Mg-Ni-Cr2O3 milled in hydrogen were studied. This composite can absorb hydrogen in milling process; if the milling time is enough long, the composite will absorb completely hydrogen. This composite has remarkable performance of hydriding and dehydriding, and the dehydriding temperature is low. The composite can absorb hydrogen above 6.0% within 50s at 200℃, and release 6.0% hydrogen within 500s at 305℃ under 0.1MPa. The thermodynamics and PCT curve of the composite were investigated, and mechanism was also analyzed.
Key words: hydrogen storage materials; Mg-Ni-Cr2O3 nanocrystalline composite; kinetics of hydriding and dehydriding
