Dealloyed PdAg core Pt monolayer shell electrocatalyst for oxygen reduction reaction

Abstract

A core–shell nanostructure with dealloyed PdAg nanoparticles as the core and a Pt monolayer as the shell shows much higher catalytic properties for oxygen reduction reaction as compared with its counterpart with alloyed PdAg as the core.

Iron and nitrogen codoped carbon catalyst with excellent stability and methanol tolerance for oxygen reduction reaction

“…For a comparison, the results of Fe 0.5 NC‐900‐1 and Fe 2.5 NC‐900‐3 are also calculated, as shown in Figure S6. For all of the catalysts, the numbers of electron transfer of ORR are close to four, indicating that the ORR on the catalysts is a typical four electron reaction process of direct reduction of oxygen molecules to water in alkaline environment …”

“…For all of the catalysts, the numbers of electron transfer of ORR are close to four, indicating that the ORR on the catalysts is a typical four electron reaction process of direct reduction of oxygen molecules to water in alkaline environment. 42 The stability of the electrocatalysts is as an important indicator for evaluating the catalytic performance. 25 Figure 5A and 5B give the comparison of the first and the 1000th CV curves of Fe 1.5 NC-900-2 and commercial Pt/C catalysts in O 2 -saturated 0.1 M KOH electrolyte, respectively.…”

“…37 Although the performance of the catalysts for ORR is greatly improved by screening suitable preparation method such as changing suitable metal salts and nitrogen sources to rationally tune the nanostructure of the catalyst, there is still a long way to develop a facile strategy to prepare ORR catalysts with low-cost as well as excellent catalytic performance. [38][39][40][41][42] Here, we report a series of FeNC catalysts with high activity, excellent stability, and methanol tolerance toward ORR. The catalysts were prepared by codoping Fe and N atoms into the carbon material via pyrolysis process.…”

“…Besides these factors, Dai's group reported the residual Fe atoms in the Fe‐N/C catalysts also affected the catalytic performances of the catalysts and they could improve the catalytic activity by attaching to the edge of the graphene surface . Although the performance of the catalysts for ORR is greatly improved by screening suitable preparation method such as changing suitable metal salts and nitrogen sources to rationally tune the nanostructure of the catalyst, there is still a long way to develop a facile strategy to prepare ORR catalysts with low‐cost as well as excellent catalytic performance …”

Platinum and PtNi Nanoparticle-Supported Multiwalled Carbon Nanotube Electrocatalysts Prepared by One-Pot Pyrolytic Synthesis with an Ionic Liquid

“…Besides, Pt alloy catalysts show excellent durability. These favorable phenomena are usually ascribed to the dealloying of the 3d transition non-noble metals such as Ni. ,− This selective dissolution results in variation in the nanoparticle structure; i.e., a Pt-rich shell covering a Pt alloy core is formed. Rudi et al also reported a systematic study on the enhancement of ORR activity by varying the Ni amount in the catalysts of the Pt x Ni 1– x series .…”