溶解
质子交换膜燃料电池
铂金
电解质
电催化剂
电化学
电极
材料科学
铂纳米粒子
化学工程
催化作用
无机化学
化学
有机化学
工程类
物理化学
作者
Raghunandan Sharma,Kasper Rode Nielsen,Peter Brilner Lund,Søren Bredmose Simonsen,Laila Grahl‐Madsen,Shuang Ma Andersen
标识
DOI:10.1002/celc.201900846
摘要
Abstract Recycling of the platinum group metals (PGMs) containing industrial wastes obtained from proton exchange membrane fuel cells (PEMFCs), electrolyzers, catalytic convertors and others is of high strategical importance for industrial sustainability. In this work, a highly efficient and environmentally friendly platinum recycling method through potentiodynamic cycling in dilute acidic chloride solutions is demonstrated and optimized to recover platinum from fuel cell electrodes. The process parameters such as upper and lower potential limits are optimized to be 1.6 and 0.4 V vs. RHE. Both the dilute acidic and the acid free Cl − containing electrolytes may be used for the dissolution. Moreover, parameters such as protocol reliability, quantification method and comparison, electrode interface structure, dissolution product and mechanisms etc. are discussed. A study in 1 M HCl shows Pt dissolution rates as high as ∼30 μg/cycle for potential cycling between 0.4 and 1.6 V (scan rate: 100 mV/s) for a PEMFC electrode with initial Pt loading of ∼470 μg. The approach demonstrates a methodology for fast parameter screening on electrocatalyst dissolution and a proof of concept industrial recycling of spent electrocatalysts.
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