Abstract
Highly dense 2D MoS2 fin-like nanostructures on carbon nanospheres were fabricated and formed the main catalyst support structure in the oxygen reduction reaction (ORR) for polymer electrolyte membrane (PEM) fuel cells. These nanofins were observed growing perpendicular to the carbon nanosphere surface in random orientations and high resolution transmission electron microscope confirmed 2D layers. The PEM fuel cell test showed enhanced electrochemical activity with good stability, generating over 8.5 W.mgPt−1 as compared to standard carbon black of 7.4 W.mgPt−1 under normal operating conditions. Electrochemical Impedance Spectroscopy confirmed that the performance improvement is highly due to the excellent water management of the MoS2 lamellar network, which facilitates water retention at low current density and flood prevention at high current density. Reliability test further demonstrated that these nanofins are highly stable in the electrochemical reaction and is an excellent ORR catalyst support.
Highlights
Dense 2D MoS2 fin-like nanostructures on carbon nanospheres were fabricated and formed the main catalyst support structure in the oxygen reduction reaction (ORR) for polymer electrolyte membrane (PEM) fuel cells
We report this novel nanostructure, consisting of magnetron sputtered catalyst Pt directly supported on 2D MoS2 on individual carbon nanospheres, and its electrochemical performance was investigated under a real single test cell working condition
When Pt was sputtered on the 0.005 mg/cm[2] MoS2@carbon nanosphere (CNS), Pt-shells were formed with an average diameter of 10 nm upon CNS, as shown in Fig. 1(e); Pt particles tended to deposit on fringes of the MoS2 flakes, resulting possibly in a higher Pt active area that exposed to fuel and electrolyte
Summary
Dense 2D MoS2 fin-like nanostructures on carbon nanospheres were fabricated and formed the main catalyst support structure in the oxygen reduction reaction (ORR) for polymer electrolyte membrane (PEM) fuel cells. ORR current density corresponded to the increasing amount of Mo edges with smaller particle size; the best performance was produced by the 2 nm MoS2 particles that favored the four-electron ORR route In their subsequent work[12], AuNP/MoS2 films, which were synthesized by a simple drop-casting modification process, showed the enhanced catalytic activity and superior stability than the commercial Pt/C catalyst, and the improvement was explained by the synergetic catalytic effect of Au in the onset potential and MoS2 in the ORR 4-electron kinetic. We report this novel nanostructure, consisting of magnetron sputtered catalyst Pt directly supported on 2D MoS2 on individual carbon nanospheres, and its electrochemical performance was investigated under a real single test cell working condition
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