Impact of p‐toluenesulfonate on polypyrrole–cobalt catalyst for oxygen reduction reaction

Abstract

Polypyrrole (PPy) and polypyrrole p-toluenesulfonate (PPy/pTS) supported cobalt (Co) catalysts have been synthesized using in situ surfactant modified chemical oxidative polymerization. These catalysts have been characterized for their structure and electrocatalytic activity employing FT-IR, Raman, SEM, HRTEM, and electrochemical techniques. The influence of pTS on the morphology and oxygen reduction reaction (ORR) activity has been discussed in respect of the formation of polaronic and bipolaronic species. The impact of these species on the electrochemical performance has been studied using continuous cycling in acidic media. Overall, PPy/pTS-Co is found to be the best suitable candidate among the catalysts synthesized for this study and can become an attractive substitute as a non-noble catalyst material for cathode applications in fuel cells.

Preparation of MOF(Fe) and its catalytic activity for oxygen reduction reaction in an alkaline electrolyte

“…碳负载的Pt及其 合金催化剂具有最好的ORR活性, 近来人们还论证了纳 米尺寸的金颗粒在碱性电解质中具有非常好的ORR活 性 [12] , 但是Pt和Au的价格昂贵. 在非贵金属的ORR催化 剂中, Fe和Co基催化剂 [13][14][15][16] 在酸性介质中具有较好的 ORR活性, 而 Mn 氧化物 [17,18] 、钙钛矿 [19,20] 以及尖晶 石 [21,22] 在碱性介质中具有较好的ORR活性, 此外，部分 Fe基催化剂在碱性电解质中也具有很好的ORR活性 [23] .…”

“…Recently, the nano Au particles have shown good ORR catalytic performance in alkaline medium [12], but Pt and Au are similarly very expensive. Among non-precious metal catalysts for the ORR, Fe-and Co-based catalysts [13][14][15][16] exhibit good activity in an acidic medium, while Mn oxides [17,18], perovskites [19,20], and spinels [21,22] have good ORR activity in an alkaline medium. However, it also has been demonstrated that Fe-based catalyst is also active toward ORR in alkaline medium [23].…”