Engineering Pt Nanoparticles onto Resin‐Derived Iron and Nitrogen Co‐Doped Porous Carbon Nanostructure Boosts Oxygen Reduction Catalysis

Abstract

The high cost and deficiency of long-term durability of carbon supported Pt catalysts have been regarded as obstacle that impeding their practical proton exchange membrane fuel cells (PEMFCs) technologies. Furtherly, iron and nitrogen co-doped carbons (Fe/NC) are emerging as a steady electrocatalyst. Unfortunately, there are less-active sites in acidic electrolyte. Herein, combining the advantages of Fe/NC and Pt catalysts, we propose an in-situ surfactant-free self-templating solution reduction strategy to construct Pt nanoparticles (NPs) onto well-devised Fe/NC porous nanostructures in order to manufacture highly performing PtÀ Fe/NC catalyst for oxygen reduction reaction (ORR). The obtained PtÀ Fe/NC catalyst displays excellent ORR performance, realizing an account of 2.53 improvement in specific activity and an account of 1.20 strengthening in mass activity toward ORR compared to the commercial Pt/C catalysts. Stability tests confirm that the assynthesized PtÀ Fe/NC catalyst is more electrochemically steady than the commercial Pt/C catalysts on account of the electronic interaction between Pt and N which result from the difference in electronegativity. Our work provides a promising strategy for exploring the accomplishment of better ORR in acid electrolytes.

Stress induced to shrink ZIF-8 derived hollow Fe-NC supports synergizes with Pt nanoparticles to promote oxygen reduction electrocatalysis

“…1d) that the lattice spacing of the catalyst particles was 0.2251 nm, which was assigned to the (111) crystal plane of Pt, indicating that the Pt salt precursor was efficiently transformed into Pt NPs, which agreed with XRD test results. 39 Furthermore, as shown in Fig. 1e-k, the uniform elemental distribution of C, N, Pt, and Fe and the obvious hollow framework structure revealed by mapping of Pt@Fe-NC further conrmed that ZIF-8@PDA-Fe 2+ was successfully transformed into hollow Fe-NC supports by pyrolysis.…”

“…metal state and oxidation state) of the metals in the catalyst. 39,44,45 Furthermore, the electrochemically active surface area of the Pt@Fe-NC catalyst was calculated to be 77.79 m 2 g À1 (Table S1 †) using the CO stripping peak area and loading of Pt, which is higher than that of commercial Pt/C (69.12 m 2 g À1 ), indicating that the Pt@Fe-NC sample can be expected to have high ORR activity.…”

Ordered PtCo Intermetallics Featuring Nitrogen‐Doped Carbon Prepared by Surface Coating Strategy for Oxygen Reduction Reaction

“…Moreover, according to oxygen reduction reaction polarization curves of PtCo@NC‐X (Figure 5b), the PtCo@NC‐60 displays a larger half‐wave potential (0.947 V) relative to PtCo@NC‐80 (0.930 V), PtCo@NC‐40 (0.920 V) and commercial Pt/C (0.896 V) catalysts, preliminarily implying that the as‐prepared PtCo@NC‐60 catalyst possesses enhanced electrocatalytic activity. To insight into their ORR activity more deeply, the mass activities (MA) and the specific activity (SA) are calculated by normalizing the current density and Pt loading on the electrode [28] . As depicted in Figure 5c, the MA in the PtCo@NC‐60 catalyst (1.36 mA ⋅ mg −1 Pt ) is 1.68, 2.10 and 6.18 times larger than that of PtCo@NC‐80 (0.81 mA ⋅ mg −1 Pt ), PtCo@NC‐40 (0.65 mA ⋅ mg −1 Pt ) and initial Pt/C (0.22 mA⋅mg −1 Pt ) catalysts, respectively.…”

“…To insight into their ORR activity more deeply, the mass activities (MA) and the specific activity (SA) are calculated by normalizing the current density and Pt loading on the electrode. [28] As depicted in Figure 5c, the MA in the PtCo@NC-60 catalyst (1.36 mA • mg À 1 Pt ) is 1.68, 2.10 and 6.18 times larger than that of PtCo@NC-80 (0.81 mA • mg À 1 Pt ), PtCo@NC-40 (0.65 mA • mg À 1 Pt ) and initial Pt/C (0.22 mA•mg À 1 Pt ) catalysts, respectively. Meanwhile, the SA of PtCo@NC-60 catalyst (1.98 mA • cm À 2 ) is 1.65, 2.00 and 6.39 times than those of PtCo@NC-80 (1.20 mA • cm À 2 ), PtCo@NC-40 (0.99 mA • cm À 2 ) and commercial Pt/C (0.31 mA • cm À 2 ), respectively (Figure 5d).…”

Atomically Dispersed Mg–N–C Material Supported Highly Crystalline Pt3Mg Nanoalloys for Efficient Oxygen Reduction Reaction

“…However, these materials can also serve as supports for dispersing and anchoring catalyst particles, offering additional benefits. In particular, metal–nitrogen-doped carbon materials (M–N–C), such as Fe–N–C and Ni–N–C, are chosen to combine with Pt nanoparticles for offsetting the drawbacks of both components and further improving the catalytic performance via metal–support interaction. − The M–N x sites are believed to act as the hub for the nucleation and growth of Pt nanoparticles . This not only allows the Pt nanoparticle to be anchored and stabilized but also induces charge redistribution between the support and Pt, thereby facilitating the catalytic activity.…”