Electrochemically exfoliated graphene as high-performance catalyst support to promote electrocatalytic oxidation of meth
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Electrochemically exfoliated graphene as high-performance catalyst support to promote electrocatalytic oxidation of methanol on Pt catalysts YUAN Xu(袁旭), YUE Wen-bo(岳文博), ZHANG Jin(张锦) Beijing Key Laboratory of Energy Conversion and Storage Materials, College of Chemistry, Beijing Normal University, Beijing 100875, China © Central South University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Abstract: Electrochemically exfoliated graphene (EEG) is a kind of high-quality graphene with few oxygen-containing functional groups and defects on the surface, and thereby is more suitable as catalyst support than other carbon materials such as extensively used reduced graphene oxide (rGO). However, it is difficult to grow functional materials on EEG due to its inert surface. In this work, ultra-small Pt nanocrystals (~2.6 nm) are successfully formed on EEG and show better electrocatalytic activity towards methanol oxidation than Pt catalysts on rGO. The outstanding catalytic properties of Pt catalysts on EEG can be attributed to the fast electron transfer through EEG and high quality of Pt catalysts such as small grain size, high dispersibility and low oxidation ratio. In addition, SnO2 nanocrystals are controllably generated around Pt catalysts on EEG to raise the poison tolerance of Pt catalysts through using glycine as a linker. Owing to its outstanding properties such as high electrical conductivity and mechanical strength, EEG is expected to be widely used as a novel support for catalysts. Key words: electrochemically exfoliated graphene; platinum; tin dioxide; glycine; methanol oxidation Cite this article as: YUAN Xu, YUE Wen-bo, ZHANG Jin. Electrochemically exfoliated graphene as high-performance catalyst support to promote electrocatalytic oxidation of methanol on Pt catalysts [J]. Journal of Central South University, 2020, 27(9): 2515−2529. DOI: https://doi.org/10.1007/s11771-020-4477-9.
1 Introduction Energy shortage and environmental pollution have become two urgent problems in the world nowadays. The development of pollution-free new energy is essential to solve the serious environmental pollution and energy crisis. As a newly emerging energy conversion device, direct methanol fuel cells (DMFCs) possess many advantages such as high energy density, operational safety and pollution-free, and thus are widely applied in automobile and aerospace industries [1, 2]. The performance of DMFCs is highly relied on the electrochemical properties of electrode
materials. Up to now, platinum is still the most efficient catalyst material for methanol oxidation [3, 4]. However, the traditional commercial Pt/C catalyst is not able to satisfy the demand for high energy-density batteries [5, 6]. A novel catalyst support is urgently needed to further increase the electrocatalytic activity, durability and utilization of Pt catalysts. Graphene is a novel two-dimensional carbon nanomaterial that has advantages of large surface area, high electrical and thermal conductivity, and remarkable mechanical property [7].
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