扫描电化学显微镜在功能材料分析中的应用

扫描电化学显微镜是一种扫描探针技术，利用微电极检测发生在固／液、液／液或者气／液界面反应物或者反应产物的连续变化。这里将对该技术原理进行详细说明。过去我们工作主要都集中在固定化酶的活性成像。最近研究的领域开始拓展到与能源转变相关材料上，如染料敏化太阳能电池和（生物）燃料电池的氧气催化还原。起初的尝试已经扩展到如何扩宽研究材料的范围和成像模式的应用范围。扫描电化学显微镜的反馈和产生～收集模式已被用于研究染料敏化太阳能电池半导体／电解质界面的光激发染料阳离子再生过程。现在开始关注更多的与太阳能的再生，燃料电池或染料敏化太阳能电池相关的复杂反应，这些复杂的反应包括外部质量传输过程、内部质量和电荷传输过程、多孔物质反应中心的本身活性等。

Scanning Electrochemical Microscopy for Analysis of Functional Material

Scanning electrochemical microscopy is a scanning probe technique that uses an amperometric microelectrode to sense localized fluxes of reagents or products of reactions taking place at solid-liquid,liquid/liquid or gas/liquid interfaces.The principle ideas of the technique will be illustrated.In the past we have worked intensively on the activity imaging of immobilized enzymes.Recently,the scope of the studies was extended to materials relevant for energy conversion,e.g.dye sensitized solar cells and oxygen reduction catalysis for(bio) fuel cells.The initial attempts are currently expanded to widen the scope of investigated materials and imaging modes applicable.The SECM feedback and generation-collection modes were used to investigate the regeneration of photoexcited dye cations at the semiconductor/electrolyte interface in a dye-sensitized solar cell.When investigated more complex reactions that come into the focus when dealing with solar fuel generation,fuel cells or DSSC are discussed.They include the combination of external mass transport and internal mass and charge transport and the intrinsic reactivity of the reaction centers within the porous materials.