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Dissolution Engineering of Platinum Alloy Counter Electrodes in Dye‐Sensitized Solar Cells
Author(s) -
Tang Qunwei,
Zhang Huihui,
Meng Yuanyuan,
He Benlin,
Yu Liangmin
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201505339
Subject(s) - dissolution , triiodide , iodide , platinum , electrolyte , dye sensitized solar cell , auxiliary electrode , inorganic chemistry , alloy , redox , transition metal , chemistry , electrode , catalysis , chemical engineering , materials science , organic chemistry , engineering
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 − /I 3 − ) redox electrolyte. Our focus is placed on the systematic studies of dissolution engineering for Pt M 0.05 ( 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 (I 3 − , I 2 ) could protect the Pt atoms from being dissolved by redox electrolyte and therefore remain the high catalytic activity of the Pt electrode.