Effect of Nitrogen-Containing Carbon Shell-Coated Carbon Support on the Catalytic Performance of Platinum–Cobalt Alloy Catalyst for Oxygen Reduction

Abstract

The support is prepared by carbonizing polyaniline-coated carbon black. On the one hand, it has the advantages of carbon black (excellent electrical conductivity, high specific surface area). On the other hand, the nitrogen−carbon shell has uniformly dispersed metal anchor sites, which effectively reduces the detachment of PtCo NPs from the carbon matrix and improves the activity and durability of the catalyst. Under acidic conditions, the mass activity (MA) of PtCo/C@NC-700 (0.53 A mg Pt −1 ) is 4.8 times that of JM Pt/C (0.11 A mg Pt −1

Review and Perspectives of Carbon-Supported Platinum-Based Catalysts for Proton Exchange Membrane Fuel Cells

“…The surface properties and pore structure of the support are the main factors affecting the selectivity and activity of the catalyst. In addition, the amorphous nature of carbon black can easily cause it to lose its catalytic activity by sintering, migration, or dissolution on the carbon support …”

“…In addition, the amorphous nature of carbon black can easily cause it to lose its catalytic activity by sintering, migration, or dissolution on the carbon support. 152 The surface properties and pore structure of the support are the main factors affecting the selectivity and activity of the catalyst. The pore volume of carbon black is mainly composed of pores <8 nm.…”

Impact of Heat Treatment on the Oxygen Reduction Reaction Performance of PtCo/C(N) Electrocatalyst in PEM Fuel Cell

“…[38,39] The ordered alloys with face-centered tetragonal (L1 0 ) and face-centered cubic (L1 2 ) crystal structures can effectively delay this phenomenon. [40][41][42][43] However, the formation of the ordered structure requires the catalyst to be subjected to high-temperature annealing treatment to overcome the atomic ordering of the kinetic energy barrier, a process that leads to sintering agglomeration of the catalyst. [44,45] Chaisubanan and coworkers [28] investigated the effect of heat treatment on the ORR performance of PtM/C (M = Cr, Pd, Co) catalysts in acidic solutions and PEMFCs.…”

“…However, the addition of Co leads to the dissolution of the catalyst in acidic and alkaline environments, which causes changes in the catalyst structure and reduces its performance [38,39] . The ordered alloys with face‐centered tetragonal (L1 0 ) and face‐centered cubic (L1 2 ) crystal structures can effectively delay this phenomenon [40–43] . However, the formation of the ordered structure requires the catalyst to be subjected to high‐temperature annealing treatment to overcome the atomic ordering of the kinetic energy barrier, a process that leads to sintering agglomeration of the catalyst [44,45] .…”

Engineering Flower-like Ni3S2 on Nanoporous CuAg Alloy Heterostructure for Efficient Methanol Oxidation Reaction

“…The rapid depletion of conventional fossil fuels, along with rising environmental pollution, has spurred an urgent demand for novel environment-friendly and efficient energy conversion devices. − Among various energy carriers to replace fossil fuels, methanol shows great potential because of its affordability, high energy density, and low carbon emission. − In particular, direct methanol fuel cells (DMFCs) have been recognized as prospective energy conversion devices, because of their high energy conversion efficiency, easy storability and transportability, environmental friendliness, and mild operating temperatures. − To date, the reactions on anode electrodes in DMFCs have been yet heavily dependent on Pt-based precious metal electrocatalysts . Despite the excellent activity of Pt-based catalysts, the scaled-up application of DMFCs has been largely hindered by their high price and extreme scarcity. , Moreover, it is worth noting that Pt-based catalysts are prone to be poisoned by intermediate products, leading to a significant deterioration in both electrocatalytic activity and stability.…”