Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 891, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162011
Keywords
pulsed laser irradiation; Au-Pd alloy; electrocatalyst; methanol oxidation reaction
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Funding
- Korea Basic Science Institute (National research Facilities and Equipment Center) - Ministry of Education [2019R1A6C1010042, 2021R1A6C103A427]
- National Research Foundation of Korea (NRF) [2020K2A9A1A06103609, 2020R1I1A1A01065748]
- National Research Foundation of Korea [2020K2A9A1A06103609, 2021R1A6C103A427, 2020R1I1A1A01065748] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Direct methanol fuel cells have attracted extensive research interest due to their high energy density and portability. This study synthesized well-dispersed and homogenous nanospheres of Au-Pd alloy with improved electrocatalytic activity for methanol oxidation reaction, providing a foundation for Pd-based alloy electrocatalysts synthesis using laser-based techniques.
Direct methanol fuel cells have attracted extensive research interest because of their relatively high energy density and portability. It is important to rationally design the composition and surface atomic structure by efficient synthesis protocols to boost cell efficiency. In this study, we employed cohesive pulsed laser irradiation and ultrasonochemical techniques to synthesize and tune the molar ratio of an Au-Pd alloy for the methanol oxidation reaction (MOR). The effective implementation of extremely rapid photoinduced reduction and reaction conditions resulted in the formation of well-dispersed and homogenous nanospheres of the Au-Pd alloy with uniform particle size. Moreover, the composition-tuned Au-Pd alloy exhibited an improved electrocatalytic activity, which might be due to its improved electrical conductivity and higher CO tolerance. The alloy achieved relatively high mass and specific activities of 0.50 A/mg(Pd) and 1.36 mA/cm(Pd)(2), respectively. Additionally, we studied the effect of the Au-Pd composition on the MOR activity and analyzed the reaction kinetics in depth. This work provides the foundation for implementing a laser-based technique to synthesize Pd-based alloy electrocatalysts for MOR application. (C) 2021 Elsevier B.V. All rights reserved.
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