Key Laboratory of Marine Chemistry and Technology, Ministry of Education, Ocean University of China, Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100 (P.R. China).
Institute of Materials Science and Engineering, Ocean University of China, Qingdao 266100 (P.R. China).
Angew Chem Int Ed Engl. 2015 Sep 21;54(39):11448-52. doi: 10.1002/anie.201505339. Epub 2015 Jul 21.
The dissolution of platinum (Pt) has been one of the heart issues in developing advanced dye-sensitized solar cells (DSSCs). We present here the experimental realization of stable counter-electrode (CE) electrocatalysts by alloying Pt with transition metals for enhanced dissolution resistance to state-of-the-art iodide/triiodide (I(-)/I3(-)) redox electrolyte. Our focus is placed on the systematic studies of dissolution engineering for PtM0.05 (M=Ni, Co, Fe, Pd, Mo, Cu, Cr, and Au) alloy CE electrocatalysts along with mechanism analysis from thermodynamical aspects, yielding more negative Gibbs free energies for the dissolution reactions of transition metals. The competitive reactions between transition metals with iodide species (I3(-), I2) could protect the Pt atoms from being dissolved by redox electrolyte and therefore remain the high catalytic activity of the Pt electrode.
铂（Pt）的溶解一直是开发先进染料敏化太阳能电池（DSSC）的核心问题之一。我们在此通过将 Pt 与过渡金属合金化，实现了稳定的对电极（CE）电催化剂，从而提高了对最先进的碘化物/三碘化物（I(-)/I3(-)）氧化还原电解质的抗溶解能力。我们的重点是系统地研究 PtM0.05（M=Ni、Co、Fe、Pd、Mo、Cu、Cr 和 Au）合金 CE 电催化剂的溶解工程，并从热力学方面进行机制分析，从而为过渡金属的溶解反应提供更负的吉布斯自由能。过渡金属与碘化物物种（I3(-)、I2）之间的竞争反应可以保护 Pt 原子不被氧化还原电解质溶解，从而保持 Pt 电极的高催化活性。
