Dissolution Engineering of Platinum Alloy Counter Electrodes in Dye‐Sensitized Solar Cells. Issue 39 (21st July 2015)

• Record Type: Journal Article
• Authors: Tang, Qunwei; Zhang, Huihui; Meng, Yuanyuan; He, Benlin; Yu, Liangmin
• Is Part Of: Angewandte Chemie international edition. Volume 54:Issue 39(2015)
• Page Start: 11448
• Page End: 11452
• Publication Date: 2015-07-21
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1002/anie.201505339
• Languages: English
• ISSNs: 1433-7851

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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 Pt<italic>M</italic>_0.05 (<italic>M</italic>=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.</p> </abstract>