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Ice-templated synthesis of multifunctional three dimensional graphene/noble metal nanocomposites and their mechanical, electrical, catalytic, and electromagnetic shielding properties

机译:冰样合成的多功能三维石墨烯/贵金属纳米复合材料及其机械,电,催化和电磁屏蔽性能

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摘要

In-situ homogeneous dispersion of noble metals in three-dimensional graphene sheets is a key tactic for producing macroscopic architecture, which is desirable for practical applications, such as electromagnetic interference shielding and catalyst. We report a one-step greener approach for developing porous architecture of 3D-graphene/noble metal (Pt and Ag) nanocomposite monoliths. The resulting graphene/noble metal nanocomposites exhibit a combination of ultralow density, excellent elasticity, and good electrical conductivity. Moreover, in order to illuminate the advantages of the 3D-graphene/noble metal nanocomposites, their electromagnetic interference (EMI) shielding and electrocatalytic performance are further investigated. The as-synthesized 3D-graphene/noble metal nanocomposites exhibit excellent EMI shielding effectiveness when compared to bare graphene; the effectiveness has an average of 28 dB in the 8.2-12.4 GHz X-band range. In the electrooxidation of methanol, the 3D-graphene/Pt nanocomposite also exhibits significantly enhanced electrocatalytic performance and stability than compared to reduced graphene oxide/Pt and commercial Pt/C.
机译:贵金属在三维石墨烯片材中的原位均匀分散是生产宏观结构的关键策略,这对于电磁干扰屏蔽和催化剂等实际应用是理想的。我们报告了一步一步的绿色方法,用于开发3D石墨烯/贵金属(Pt和Ag)纳米复合材料整体结构的多孔结构。所得石墨烯/贵金属纳米复合材料表现出超低密度,优异的弹性和良好的导电性的组合。此外,为了阐明3D石墨烯/贵金属纳米复合材料的优势,进一步研究了它们的电磁干扰(EMI)屏蔽和电催化性能。与裸石墨烯相比,合成后的3D石墨烯/贵金属纳米复合材料表现出出色的EMI屏蔽效果;在8.2-12.4 GHz X频段范围内,效果平均为28 dB。在甲醇的电氧化中,与还原的氧化石墨烯/ Pt和市售Pt / C相比,3D-石墨烯/ Pt纳米复合材料还表现出显着增强的电催化性能和稳定性。

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