Liao Cheng-Hao, Chen Jing-Ying, Liu Guang-Yang, Xu Zhe-Rui, Lee Sheng, Chiang Cheng-Kang, Hsieh Yi-Ting
Department of Chemistry, Soochow University, Taipei City 11102, Taiwan.
Department of Chemistry, National Dong Hwa University, Hualien City 97401, Taiwan.
ACS Omega. 2022 Jun 2;7(23):19930-19938. doi: 10.1021/acsomega.2c01721. eCollection 2022 Jun 14.
A green method for synthesizing Pd nanoparticles/graphene composites from a choline chloride-oxalic acid deep eutectic solvent (DES) without a reducing agent or a surfactant is reported. Deep eutectic solvents are usually composed of halide salts and hydrogen-bond donors, and many are biocompatible and biodegradable. The merits of deep eutectic solvents include that they serve as reducing agents and dispersants, and Pd nanoparticles are tightly anchored to graphene. The size and dispersion of Pd particles are improved when supercritical carbon dioxide (scCO) is used because it has gaslike diffusivity and near-zero surface tension, which results in excellent wettability between the scCO and the carbon surface. The prepared sc-Pd NPs/GR/SPCE shows excellent activity toward glycerol oxidation compared to composites not fabricated by scCO processes. This study demonstrates the potential of using this scCO-assisted protocol combined with deep eutectic solvents to further construct nanoparticles/graphene composites.
报道了一种从氯化胆碱 - 草酸低共熔溶剂（DES）中合成钯纳米颗粒/石墨烯复合材料的绿色方法，该方法无需还原剂或表面活性剂。低共熔溶剂通常由卤化物盐和氢键供体组成，许多具有生物相容性和可生物降解性。低共熔溶剂的优点包括它们可作为还原剂和分散剂，并且钯纳米颗粒紧密锚定在石墨烯上。当使用超临界二氧化碳（scCO₂）时，钯颗粒的尺寸和分散性得到改善，因为它具有类似气体的扩散性和接近零的表面张力，这导致scCO₂与碳表面之间具有优异的润湿性。与未通过scCO₂工艺制备的复合材料相比，制备的sc-Pd NPs/GR/SPCE对甘油氧化表现出优异的活性。本研究证明了使用这种scCO₂辅助方案结合低共熔溶剂进一步构建纳米颗粒/石墨烯复合材料的潜力。
