High Activity of Platinum-Cobalt Supported by Natto-like N-Doped Carbon Sphere as Durable Catalyst for Oxygen Reduction Reaction

Abstract

This study demonstrates a platinum and cobalt alloy (PtCo) supported by natto-like N-doped carbon spheres (n-NCS), denoted as PtCo/n-NCS, showing excellent catalytic activity and high durability for the oxygen reduction reaction (ORR). PtCo/n-NCS demonstrate the electron-transfer number of 3.98 and only the decay of 53 mV on half-wave potential after 30 000 cycles. PtCo/n-NCS contribute a high Pt mass activity of 823.01 mA mg Pt −1 at 0.80 V, compared to Pt/C and PtCo/C with 105.46 and 235.20 mA mg Pt −1 , respectively. n-NCS provide a large surface area to increase NCS for the utilization of PtCo catalysts and a large amount of the graphitic-N structures to enhance the four-electron transfer. Therefore, PtCo/n-NCS have a superior ORR activity, making them the promising catalysts for the ORR.

Metallic-Bonded Pt–Co for Atomically Dispersed Pt in the Co4N Matrix as an Efficient Electrocatalyst for Hydrogen Generation

“…42 For EXAFS in Figure 1f, the peaks in T-Pt-Co 4 N shift to a lower R, which can be attributed to the formation of Pt−Co bond. 42,43 The energy dispersive X-ray spectroscopy (EDS) element mapping images (Figure 1g−j and Figure S7−S9) further demonstrate the existence of Co, Pt, N, and C elements, in which the content of Pt is very low. In addition, the inductively coupled plasma optical emission spectroscopy (ICP-OES) analysis indicates that the Pt content is equal to 0.33 wt %.…”

Cobalt-Doped Pd@Pt Core–Shell Nanoparticles: A Correlative Study of Electronic Structure and Catalytic Activity in ORR

“…In order to overcome this challenge and maximize the usage, activity, and durability of platinum, this work combines the benefits of all of these strategies to synthesize a shape-controlled cobalt-doped Pd@Pt catalyst. The focus is on Pd@Pt core@shell NPs due to their unique structure, which modifies the structural and electronic properties of Pt, resulting in significant mass activity and durability toward ORR. , Cobalt is also chosen as the dopant because of its substantial role in increasing the durability of Pt-based catalysts. – Octahedral Pd@Pt is also reviewed and confirmed to have the highest ORR performance among all other facets. , To the best of our knowledge, this is the first time that cobalt has been used as a metal dopant in a Pd@Pt core–shell structure to enhance both the activity and durability. By combining synthetic efforts, electrochemical measurements and ex-situ and in situ synchrotron-based X-ray absorption spectroscopy (XAS), the study demonstrates that the cobalt-doped Pd@Pt NP is an effective and state-of-the-art electrocatalyst for ORR, due to its simultaneous remarkable electrocatalytic activity and superior stability with respect to undoped NPs and commercial Pt/C catalysts.…”

Construction of Pt/Powder Charcoal Electrocatalyst Utilizing MnO2 as an Additive to Improve the Stability for Oxygen Reduction Reaction

“…Overuse of fossil fuels not only puts them at risk of exhaustion but also results in significant carbon dioxide emissions. − As a result, the adoption of sustainable and clean energy is critical to resolving the aforementioned issues. Recently, proton exchange membrane fuel cells (PEMFC) have attracted much attention as a green energy conversion mechanism that can directly transform chemical energy into electric energy. − However, the widespread application is restricted due to the poor kinetics in cathodic reactions. To improve the sluggish kinetics, carbon substrate supported Pt (Pt/C) catalysts are utilized as cathodic materials .…”