Poudyal Durgasha C, Dugani Rajshree, Dash Banendu Sunder, Dhavale Manjiri, Satpati Ashis Kumar, Haram Santosh K
Department of Chemistry, Savitribai Phule Pune University, Ganeshkhind, Pune 411007, India.
Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
ACS Omega. 2021 May 21;6(21):13579-13587. doi: 10.1021/acsomega.1c00114. eCollection 2021 Jun 1.
The composite of Pt with transition metals is viewed as the most promising anode material for direct methanol fuel cell (DMFC) applications. Besides the decrease in the Pt loading, these multimetallic structures help in circumventing CO poisoning issues associated with a Pt catalyst. Herein, we prepared and loaded Pt-Sn bimetallic nanoparticles on an electron-rich and stable substrate consisting of graphitic nitride (GCN) and graphene oxide (GO)/reduced graphene oxide (r-GO) hybrid composites. The γ-radiolysis method was employed for coreduction of metal salts to deposit the binary composite of metal nanoparticles over the substrates. These structures were tested as the anode material for the methanol oxidation reaction (MOR). Among various possible combinations, Pt-Sn-loaded rGO-GCN (Pt-Sn/rGO-GCN) demonstrated the current density of ca. 2.4 A/mg. To the best of our knowledge, this value is among the highest ones, reported for similar systems in the acidic pH. Furthermore, these composites demonstrated excellent stability in the repeated cycle test. The improved performance is associated to the plenty of -OH groups provided by the Sn counterpart and a large number of adsorption sites from the electron-reached GCN counterpart.
铂与过渡金属的复合材料被视为直接甲醇燃料电池（DMFC）应用中最具前景的阳极材料。除了降低铂载量外，这些多金属结构有助于规避与铂催化剂相关的一氧化碳中毒问题。在此，我们将铂-锡双金属纳米颗粒制备并负载在由石墨氮化碳（GCN）和氧化石墨烯（GO）/还原氧化石墨烯（r-GO）杂化复合材料组成的富电子且稳定的基底上。采用γ辐射分解法将金属盐共还原，以在基底上沉积金属纳米颗粒的二元复合材料。这些结构被用作甲醇氧化反应（MOR）的阳极材料进行测试。在各种可能的组合中，负载铂-锡的rGO-GCN（Pt-Sn/rGO-GCN）表现出约2.4 A/mg的电流密度。据我们所知，该值是在酸性pH条件下类似体系所报道的最高值之一。此外，这些复合材料在重复循环测试中表现出优异的稳定性。性能的提升与锡提供的大量-OH基团以及富电子的GCN提供的大量吸附位点有关。
