Zr enhanced Fe,N, S co-doped carbon-based catalyst for high-efficiency oxygen reduction reaction

Fe-N_x catalysts have received widespread attention in recent years due to their excellent catalytic performance, hoping to replace platinum for oxygen reduction reactions (ORR). In recent years, more studies have shown that when the catalyst contains two or more metals doped, its catalytic performance will be improved. Herein, using the high temperature pyrolysis method, through the incorporation of the second phase metal (Zr), melamine as the nitrogen source, and thiourea as the sulfur source, a high-activity carbon-based catalyst doped with Fe and Zr bimetals was synthesized. Originating from the strong interaction between Fe species and ZrO₂ clusters and the promotion of O₂ adsorption by ZrO₂ nanoparticles supported on nitrogen-doped carbon, this catalyst has a better ORR electrocatalytic performance than 46% TKK commercial platinum carbon in 0.1 M KOH, exhibiting an onset potential of 1.047 V vs RHE, a half-wave potential of 0.909 V vs RHE. It provides a new idea for the preparation of high-performance bimetallic-doped carbon-based electrocatalysts.     

钌基双金属聚酞菁电催化析氧性能研究

电解水制氢阳极电催化析氧反应(OER)动力学缓慢，可采用阳极OER催化剂提高。采用简单的低温热解法制备出钌(Ru)、铁钌(Fe Ru)和钴钌(CoRu)复合聚酞菁等一系列催化剂，通过X射线粉末衍射仪(XRD)、扫描电子显微镜(SEM)、X射线光电子能谱(XPS)对催化剂的形貌和结构进行表征，并采用电化学工作站对催化剂的析氧等电催化性能进行测试。测试结果表明，催化剂Fe₃Ru-PPc在碱性环境下电流密度为50 mA·cm^-2时的过电位为303.5 mV，塔菲尔斜率仅为42.3 mV·dec^-1，相比于商业Ir O₂具有更好的OER活性。对其结构分析可知，Fe与Ru的结合使得材料的电子结构发生变化，促进了OER的动力学过程，从而使其具有更好的OER活性和载流子迁移率。