Cristina Silva , Irina Borbáth , Erzsébet Dodony , Dániel Olasz , György Sáfrán , Ágnes Szegedi , Kristóf Zelenka , András Tompos , Zoltán Pászti
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引用次数: 0
摘要
研究了强金属-支撑相互作用（SMSI）的发展及其对 Pt/Ti0.8Mo0.2O2-C 体系催化性能的影响，该体系是混合氧化物-碳复合支撑铂电催化剂家族的代表。比较了制备的 Pt/Ti0.8Mo0.2O2-C 催化剂及其在 150-450 °C 温度范围内还原的同类催化剂的结构、表面化学和电化学特性。TEM 元素图谱证实，所有催化剂中都普遍形成了铂-氧化物-铂-氧化物三重结。XPS 显示，在制备的催化剂和还原的催化剂中，铂粒子和氧化物之间都存在电子相互作用，此外，在 150-250 °C 的温度范围内，钼向铂表面的迁移是通过还原开始的。电化学测量结果表明，这些与铂结合的钼物种具有耐久性，同时也提高了催化剂的氧还原活性。根据 10,000 周期稳定性测试的结果，建议在 250-350 °C 之间进行还原预处理，以通过 SMSI 提高 Pt/Ti0.8Mo0.2O2-C 催化剂的性能。
Stability enhancement of molybdenum modified rutile – carbon composite supported platinum electrocatalysts by reductive pretreatment: Surface characteristics and advanced electrocatalytic properties
Development of strong metal-support interaction (SMSI) and its influence on the catalytic performance of the Pt/Ti0.8Mo0.2O2-C system, a representative of the mixed oxide-carbon composite supported Pt electrocatalyst family, were investigated. Structural, surface chemical and electrochemical properties of the as-prepared Pt/Ti0.8Mo0.2O2-C catalyst and its counterparts reduced in the 150–450 °C temperature range were compared. TEM elemental mapping confirmed the widespread formation of Pt-oxide-C triple junctions in all catalysts. XPS revealed electronic interaction between the Pt particles and the oxide both in the as-prepared and the reduced catalysts, moreover, demonstrated that transport of Mo to the surface of Pt is initiated by reduction in the 150–250 °C range. Electrochemical measurements pointed out the durability of these Pt-bound Mo species, which also enhance the oxygen reduction activity of the catalyst. Based on the results of 10,000-cycle stability tests, reductive pretreatment between 250–350 °C is recommended for enhancing the properties of Pt/Ti0.8Mo0.2O2-C catalysts by SMSI.
期刊介绍：
Materials Research Bulletin is an international journal reporting high-impact research on processing-structure-property relationships in functional materials and nanomaterials with interesting electronic, magnetic, optical, thermal, mechanical or catalytic properties. Papers purely on thermodynamics or theoretical calculations (e.g., density functional theory) do not fall within the scope of the journal unless they also demonstrate a clear link to physical properties. Topics covered include functional materials (e.g., dielectrics, pyroelectrics, piezoelectrics, ferroelectrics, relaxors, thermoelectrics, etc.); electrochemistry and solid-state ionics (e.g., photovoltaics, batteries, sensors, and fuel cells); nanomaterials, graphene, and nanocomposites; luminescence and photocatalysis; crystal-structure and defect-structure analysis; novel electronics; non-crystalline solids; flexible electronics; protein-material interactions; and polymeric ion-exchange membranes.
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