Impact of CuFe bimetallic core on the electrocatalytic activity and stability of Pt shell for oxygen reduction reaction

Stability of Platinum‐Group‐Metal‐Based Electrocatalysts in Proton Exchange Membrane Fuel Cells

“…method, galvanic displacement method, etc. [80,81] PGM-based catalysts with core-shell nanostructures, as a "one stone two birds" strategy, enables not only a decreased Pt loading but also high stability for the ORR [82] (Figure 3d). The Pt shell can inhibit the exposure of nonprecious transition metals to the acidic solution and therefore increase the stability.…”

“…Another strategy to deter catalyst degradation is to develop core–shell nanostructures, which could be fabricated with the Stöber method, solvothermal method, one‐pot synthetic method, galvanic displacement method, etc. [ 80,81 ] PGM‐based catalysts with core–shell nanostructures, as a “one stone two birds” strategy, enables not only a decreased Pt loading but also high stability for the ORR [ 82 ] (Figure 3d). The Pt shell can inhibit the exposure of nonprecious transition metals to the acidic solution and therefore increase the stability.…”

“…d) Elemental line-scanning of Cu, Fe, and Pt elements in the Cu 0.75 Fe 0.25 @Pt/C, and the comparison of MA at 0.9 V for JM Pt/C catalyst, Cu@Pt/C, Cu 0.75 Fe 0.25 @Pt/C, and Cu 0.5 Fe 0.5 @Pt/C before and after durability test. Reproduced with permission [80]. Copyright 2020, Elsevier.…”

Bimetallic ZIF-Based PtCuCo/NC Electrocatalyst Pt Supported with an N-Doped Porous Carbon for Oxygen Reduction Reaction in PEM Fuel Cells

“…As shown in Figure e,f, the current density value of PtCuCo/NC also gradually increases as the rotation speed increases. The electron transfer number ( n ) calculated using the K–L equation is 3.97, indicating that the ORR catalyzed by PtCuCo/NC is mainly through the direct four-electron pathway to directly convert O 2 to H 2 O, with high operating potential and current efficiency, which can avoid the production of large amounts of H 2 O 2 by the two-electron process and reduce catalyst and membrane damage while improving the reaction efficiency …”

“…The electron transfer number (n) calculated using the K−L equation is 3.97, indicating that the ORR catalyzed by PtCuCo/NC is mainly through the direct four-electron pathway to directly convert O 2 to H 2 O, with high operating potential and current efficiency, which can avoid the production of large amounts of H 2 O 2 by the two-electron process and reduce catalyst and membrane damage while improving the reaction efficiency. 62 Stability is a critical index for evaluating the catalytic performance of ORR. To evaluate the stability of the prepared catalysts, accelerated stability tests (ADTs) were performed on PtCuCo/NC in an O 2 -saturated 0.1 M HClO 4 solution with a scan rate of 100 mV s −1 and 10,000 cyclic potential scans in the voltage range of 0.6−1.1 V and compared with Pt/C.…”