Asiabi Hamid, Yamini Yadollah, Shamsayei Maryam, Saievar-Iranizad Esmaiel, Bayat Amir, Kaverlavani Saeid Kamari
Department of Chemistry, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Islamic Republic of Iran.
Department of Physics, Faculty of Science, Tarbiat Modares University, Tehran, Islamic Republic of Iran.
Sci Rep. 2018 Oct 17;8(1):15325. doi: 10.1038/s41598-018-33166-8.
Design and synthesis of effective electrocatalysts for oxygen reduction reaction in alkaline environments is critical to reduce energy losses in alkaline fuel cells. We have systematically evaluated new approaches for reducing the Pt content while retaining the activity of a Pt-based catalyst with hydrolytic phases containing hydroxide moieties in addition to metal ions and ligands. We report for the first time architectured organic-inorganic hybrid nanorod catalyst, which is fabricated by solvothermal reaction of KMCl (M = Pd, Pt) with picolinic acid (PA) (chelating agent) in the presence of FeCl. Excess base produces isostructural coordination M-PA complex to Fe-OH chains. A generic formula can be written as FePtPd(OH)PA. The electrocatalytic activities of the hybrid nanorods are explored for oxygen reduction reaction (ORR) in alkaline medium. The onset potential of ORR is significantly reduced with a positive shift of about 109 mV and twice the reduction current density is observed in comparison with Pt/C with the same mass loading. We believe that this work may lead towards the development of heterodoped organic- inorganic hybrid materials with greatly enhanced activity and durability for applications in catalysis and energy conversion.
设计和合成用于碱性环境中氧还原反应的有效电催化剂对于减少碱性燃料电池中的能量损失至关重要。我们系统地评估了在保留含金属离子和配体以及含氢氧化物部分水解相的铂基催化剂活性的同时降低铂含量的新方法。我们首次报道了一种结构化的有机-无机杂化纳米棒催化剂，它是通过在FeCl存在下，使KMCl（M = Pd，Pt）与吡啶甲酸（PA）（螯合剂）进行溶剂热反应制备而成的。过量的碱会产生与Fe-OH链同构的配位M-PA络合物。其通式可写为FePtPd(OH)PA。研究了杂化纳米棒在碱性介质中对氧还原反应（ORR）的电催化活性。与相同质量负载的Pt/C相比，ORR的起始电位显著降低，正向偏移约109 mV，并且还原电流密度增加了两倍。我们相信这项工作可能会推动具有大大增强的活性和耐久性的异质掺杂有机-无机杂化材料的开发，用于催化和能量转换应用。
