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利用飞行时间质谱(TOF-MS)观测到氯负离子从合成的微孔晶体材料C12A7-Cl-(11CaO·7Al2O3·CaCl2)表面发射出来,详细研究了C12A7-Cl-的发射特性,包括发射强度分支比、温度效应、电场效应和表观活化能.在我们的检测范围内从C12A7-Cl-表面发射的离子中绝大部分是氯负离子(最大强度分支比为98%),此外还有弱的氧负离子和电子发射.各种离子的绝对发射电流强度都随着表面温度升高或引出电场强度的增加而显著增强,随着引出电场强度从200增加到1200V·cm-1,氯负离子发射的表观活化能从180.9kJ·mol-1减小到110.0kJ·mol-1.氯负离子和C12A7-Cl-表面之间的结合能大约是228kJ·mol-1.研究了氯负离子的发射稳定性,并且应用一种电化学注入法,以获得持续的氯负离子发射.基于上述实验还讨论了氯负离子的形成和发射机理.目前的方法可望被用于发展氯负离子储存/发生器.
The emission properties of C12A7-Cl-, including the emission intensity branch, were investigated in detail by the time-of-flight mass spectrometry (TOF-MS) analysis of the emission of chlorine anions from the surface of the synthesized microcrystalline C12A7-Cl- (11CaO · 7Al2O3 · CaCl2) Ratio, temperature effect, electric field effect and apparent activation energy. The majority of the ions emitted from the C12A7-Cl- surface within our detection range are chloride ions (maximum intensity branching ratio is 98%), in addition to weak Oxygen anion and electron emission. The absolute emission current intensities of various ions are significantly enhanced with the increase of surface temperature or the increase of electric field strength. With the increase of the electric field strength from 200 to 1200 V · cm -1, The apparent activation energy decreases from 180.9kJ · mol-1 to 110.0kJ · mol-1. The binding energy between the chlorine anion and the C12A7-Cl- surface is about 228 kJ · mol -1. The emission stability of the chloride anion , And an electrochemical injection method was used to obtain sustained chlorine anion emission.The formation and emission mechanism of chlorine anion were also discussed based on the above experiment.The present method is expected to be used to develop a chlorine anion storage / generator.