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Environmentally and Industrially Friendly Recycling of Platinum Nanoparticles Through Electrochemical Dissolution–Electrodeposition in Acid‐Free/Dilute Acidic Electrolytes
ChemSusChem ( IF 7.5 ) Pub Date : 2018-09-11 , DOI: 10.1002/cssc.201801604 Raghunandan Sharma 1 , Sašo Gyergyek 2 , Shuang Ma Andersen 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-09-11 , DOI: 10.1002/cssc.201801604 Raghunandan Sharma 1 , Sašo Gyergyek 2 , Shuang Ma Andersen 1
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A process to recycle platinum from industrial waste, for example, spent catalysts from polymer fuel cells and electrolyzers, through potentiodynamic dissolution along with potentiostatic electrodeposition in dilute acidic/acid‐free baths has been explored. During potentiodynamic dissolution, owing to Ostwald ripening, redeposition of the dissolved Pt species on source nanoparticles becomes significant, leading to lower overall dissolution efficiency. Alternatively, high concentrations of Pt‐complexing agents (e.g., Cl−) are required to stabilize dissolved species through complex formation. The present process overcomes those limitations by removing the dissolved Pt species continuously through electrodepositing them in the form of Pt0 on another electrode. Such a process significantly promotes the overall reaction kinetics, and an increase in dissolution rate by a factor of two or more has been observed in non‐complexing electrolytes. The process may be implemented for environmentally and industrially friendly recycling of Pt in dilute acidic/acid‐free baths, thus eliminating the additional steps such as electrolyte upconcentration and post‐dissolution reduction of dissolved Pt species.
中文翻译：
在无酸/稀酸性电解液中通过电化学溶解-电沉积对铂纳米颗粒进行环保和工业友好的回收利用
已经探索了一种通过在稀酸性/无酸浴中通过恒电位溶解以及恒电位电沉积从工业废料（例如聚合物燃料电池和电解槽的废催化剂）中回收铂的方法。在电位动力学溶解过程中，由于奥斯特瓦尔德（Ostwald）熟化，溶解的Pt物质在源纳米颗粒上的再沉积变得很重要，从而导致总体溶解效率降低。可替代地，高浓度的Pt-络合剂（例如Cl - ）是必需的，通过复合物形成来稳定溶解的物质。本方法通过以Pt 0的形式电沉积溶解的Pt物种来连续去除溶解的Pt物种，从而克服了这些限制。在另一个电极上。这种过程显着促进了整体反应动力学，并且在非络合电解质中观察到溶解速率提高了两倍或更多。该工艺可在稀酸/无酸浴中实现对Pt的环境和工业友好循环，从而消除了其他步骤，例如电解质浓度过高和溶解后Pt种类的溶解后减少。
更新日期：2018-09-11
中文翻译：
在无酸/稀酸性电解液中通过电化学溶解-电沉积对铂纳米颗粒进行环保和工业友好的回收利用
已经探索了一种通过在稀酸性/无酸浴中通过恒电位溶解以及恒电位电沉积从工业废料（例如聚合物燃料电池和电解槽的废催化剂）中回收铂的方法。在电位动力学溶解过程中，由于奥斯特瓦尔德（Ostwald）熟化，溶解的Pt物质在源纳米颗粒上的再沉积变得很重要，从而导致总体溶解效率降低。可替代地，高浓度的Pt-络合剂（例如Cl - ）是必需的，通过复合物形成来稳定溶解的物质。本方法通过以Pt 0的形式电沉积溶解的Pt物种来连续去除溶解的Pt物种，从而克服了这些限制。在另一个电极上。这种过程显着促进了整体反应动力学，并且在非络合电解质中观察到溶解速率提高了两倍或更多。该工艺可在稀酸/无酸浴中实现对Pt的环境和工业友好循环，从而消除了其他步骤，例如电解质浓度过高和溶解后Pt种类的溶解后减少。
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