Atomically dispersed single iron sites for promoting Pt and Pt₃Co fuel cell catalysts: performance and durability improvements

Abstract

Significantly reducing platinum group metal (PGM) loading while improving catalytic performance and durability is critical to accelerating proton-exchange membrane fuel cells (PEMFCs) for transportation. Here we report an effective strategy...

Stability of a Fe-Rich Cathode Catalyst in an Anion Exchange Membrane Fuel Cell

“…A similar Pt/Fe-N-C catalyst structure was adopted by Xie et al in an acidic fuel cell environment [21]. The results showed a high cathodic performance, 0.46A/mgPt, in terms of the amount of the Pt used, compared to 0.19A/mgPt of the commercial Pt/C catalyst [20]. Another PtFe composite catalyst was developed by Mayorova et al, using a heterometallic carboxylate complex structure, showing an ORR activity of 20% over the conventional Pt/C catalyst [22].…”

“…Moreover, Fe was also used as an alloy component in many fuel cell catalyst systems, including Pt-Fe/C, Ni-Cu-Fe, and FeMn [17][18][19]. By using the Fe-N-C composite as the substrate of Pt, Qiao et al developed a Pt/FeN4-C catalyst, which achieved an 824 mW/cm 2 power density at 0.67 V [20]. The PtFe composite catalyst activity retained 80% of its initial value after 30000 cycles of testing at between 0.6V and 0.9V [20].…”

“…By using the Fe-N-C composite as the substrate of Pt, Qiao et al developed a Pt/FeN4-C catalyst, which achieved an 824 mW/cm 2 power density at 0.67 V [20]. The PtFe composite catalyst activity retained 80% of its initial value after 30000 cycles of testing at between 0.6V and 0.9V [20]. A similar Pt/Fe-N-C catalyst structure was adopted by Xie et al in an acidic fuel cell environment [21].…”

Highly-dispersed and high-metal-density electrocatalysts on carbon supports for the oxygen reduction reaction: from nanoparticles to atomic-level architectures

“…The introduction of synergistic components (such as homogeneous NPs [142] or heterogeneous NPs [143]) can controllably adjust the electronic and geometric structures of SACs and improve the graphitization of carbon supports, hence improving the activity, selectivity, and stability of SACs for the ORR [144]. On the contrary, some transition metal SACs (MN 4 sites) can also promote noble metal NPs for the ORR due to the synergistic effects [145,146].…”

“…On the other hand, the transition metal SACs with MN 4 sites can synergistically promote single noble metal (or its alloy) NPs for the ORR in acid medium [145,146]. For example, He and Mu [145] reported a Pt@Co SAs-ZIF-NC catalyst by isolation of Pt NPs with CoN 4 sites on ZIF-based N-doped carbon.…”