Templated-Assisted Synthesis of Structurally Ordered Intermetallic Pt₃Co with Ultralow Loading Supported on 3D Porous Carbon for Oxygen Reduction Reaction

Abstract

Simple and reliable mass production of platinum-based alloy catalysts with excellent activity and stability is an enormous challenge for the wide commercialization of proton-exchange membrane fuel cells (PEMFC), especially those with ultralow loading of Pt. Herein, an economical, highly durable, and efficient catalyst consisting of structurally ordered intermetallic Pt 3 Co alloy nanoparticles with ultralow Pt loading (1.4 wt %) supported on hierarchically porous carbon structure (three-dimensional, 3D Pt 3 Co/C) were synthesized with large-scale production by the NaCl-template-assisted approach. The obtained best sample, 3D Pt 3 Co/C#1, exhibited mass activities of 11.56 and 0.70 A mg Pt −1 for oxygen reduction reactions (ORRs) in alkaline and acidic electrolytes, which are 60.8 and 6.4 times those of commercial Pt/C, respectively. Furthermore, the 3D Pt 3 Co/C#1 exhibited excellent stability both in acidic and alkaline electrolytes, with almost no decay of the half-wave potential after 5000 potential cycles. This work proposes a new high-yielding, simple, and environmentally friendly method to fabricate excellent Ptbased alloy electrocatalysts with ultralow loading of Pt, which opens up new hopes for the development of PEMFC.

Highly Dispersed Pt3Co Nanocatalysts Embedded in Porous Hollow Carbon Spheres with Efficient Electrocatalytic O2-Reduction and H2-Evolution Activities

“…The Pt 4f binding energy of Pt 3 Co@C has a slight positive shift of 0.1 and 0.12 eV compared to that of JM Pt/C. The non-negligible movement could be due to the alloying of Co with Pt, resulting in the transfer of electrons from Pt to Co, which improves the electronic structure of Pt and leads to a downward shift of the d-band center of Pt …”

“…The nonnegligible movement could be due to the alloying of Co with Pt, resulting in the transfer of electrons from Pt to Co, which improves the electronic structure of Pt and leads to a downward shift of the d-band center of Pt. 33 In addition, we discovered that Co exists mainly as Co 2+ , indicating that the outermost atom is not completely Pt. During heat treatment, Co atoms diffuse from the internal to the surface of the alloy particles and subsequently oxidized to CoO in the atmosphere by oxygen or water in the air.…”

Metal–Organic Framework-Derived PtNi on N-Doped Carbon Boosting Efficient Oxygen Electrocatalysis

“…In these tests, we used 0.1 M KOH (90%, Sigma-Aldrich) and 0.1 M HClO 4 (99.9%, China national medicines Co., Ltd.). By using eq , potential values are converted into RHE E normalv normals normalR normalH normalE = E normalv normals normalA normalg / normalA normalg normalC normall + E normalΦ normalA normalg / normalA normalg normalC normall + 0.059 normalp normalH …”

Pt-Based Intermetallic Nanocrystals in Cathode Catalysts for Proton Exchange Membrane Fuel Cells: From Precise Synthesis to Oxygen Reduction Reaction Strategy

“…Since the successful synthesis of monodisperse Pt-Fe intermetallic nanocrystals by Sun's group in 2000, more and more attention has been paid to the synthesis of ordered nanocrystals [30,31]. There are quite a few recent studies for Pt-based intermetallic NPs for fuel cells [32][33][34][35][36].…”