Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO3−δ Additive,ChemElectroChem

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Enhancing Oxygen Reduction Reaction Catalytic Activity Using a Sub‐Stoichiometric CaTiO3−δ Additive
ChemElectroChem ( IF 3.5 ) Pub Date : 2019-10-16 , DOI: 10.1002/celc.201901292
Lucia Mazzapioda ₁ , Carmelo Lo Vecchio ₂ , Annalisa Paolone ₃ , Antonino Salvatore Aricò ₂ , Vincenzo Baglio ₂ , Maria Assunta Navarra ₁

Affiliation

Platinum scarcity and its high cost have led to the requirement of alternative materials catalysing the oxygen reduction reaction (ORR), which is the main rate‐determining step occurring in electrochemical devices, including metal‐air batteries and fuel cells. We report a study on a sub‐stoichiometric calcium titanate (CaTiO_3−δ, CTO) compound used as promoter for the ORR in order to reduce the Pt loading and improve its electrocatalytic activity. Composite catalysts based on Pt/C with different amounts of CTO were prepared and their activity was investigated by rotating disk electrode (RDE). The obtained results proved a higher catalytic activity for the composite electrode, with respect to pure Pt/C, in terms of electrochemically active surface area, oxygen reduction current density, onset potential and stability.

中文翻译：

使用亚化学计量的CaTiO3-δ添加剂提高氧还原反应的催化活性

铂金的稀缺及其高成本导致人们需要替代材料来催化氧还原反应（ORR），这是电化学设备（包括金属空气电池和燃料电池）中发生的主要速率确定步骤。我们报告了一项关于亚化学计量的钛酸钙（CaTiO _3−δ，CTO）化合物用作ORR的促进剂，以减少Pt负载并改善其电催化活性。制备了具有不同CTO量的基于Pt / C的复合催化剂，并通过旋转圆盘电极（RDE）研究了它们的活性。就电化学活性表面积，氧还原电流密度，起始电势和稳定性而言，所获得的结果证明相对于纯Pt / C，复合电极具有更高的催化活性。

更新日期：2019-10-17

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