Schön Daniela, Golnak Ronny, Tesch Marc F, Winter Bernd, Velasco-Velez Juan-Jesus, Aziz Emad F, Xiao Jie
Institute of Methods for Material Development, Helmholtz-Zentrum Berlin für Materialien und Energie , Albert-Einstein-Strasse 15, 12489 Berlin, Germany.
Department of Physics, Freie Universität Berlin , Arnimallee 14, 14195 Berlin, Germany.
J Phys Chem Lett. 2017 Oct 19;8(20):5136-5140. doi: 10.1021/acs.jpclett.7b02381. Epub 2017 Oct 6.
Detection of ionic current with two electrodes installed in a liquid cell has been established previously as an effective method, termed as total ion yield (TIY), to acquire X-ray absorption (XA) spectra of liquid solutions behind a membrane. In this study, the exact locations where TIY signals are generated are further investigated and unequivocally identified. The detected ionic current stems dominantly from the bulk solution species while only marginally from the species located at the membrane-solution interface. Such a two-electrode TIY detection in a liquid cell combines the advantages of bulk sensitivity of fluorescence yield and high signal strength (for light elements) of electron yield, exhibiting its novel and promising role in the XA spectroscopy measurements of liquid cells.
先前已确立，在液体池中安装两个电极来检测离子电流是一种有效的方法，称为总离子产率（TIY），用于获取膜后液体溶液的X射线吸收（XA）光谱。在本研究中，进一步研究并明确确定了TIY信号产生的确切位置。检测到的离子电流主要源于本体溶液中的物种，而仅少量源于位于膜 - 溶液界面处的物种。这种在液体池中进行的双电极TIY检测结合了荧光产率的本体灵敏度和电子产率的高信号强度（对于轻元素）的优点，在液体池的XA光谱测量中展现出其新颖且有前景的作用。
