One-step preparation of magnetic recyclable quinary graphene hydrogels with high catalytic activity

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• 作者：Junshuai Zhang^a ; Tongjie Yao^a ; ; Chenchen Guan^a ; Nanxi Zhang^b ; Xin Huang^a ; Tieyu Cui^a ; Jie Wu^c ; Xiao Zhang^a ; ^{yaotj@hit.edu.cn}
• 关键词：Polypyrrole ; Reduced graphene oxide ; Fe2O3 nanoparticles ; Catalysis ; Hydrogels
• 刊名：Journal of Colloid and Interface Science
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：491
• 期：Complete
• 页码：72-79
• 全文大小：2720 K
• 卷排序：491

文摘

Metal nanoparticles (NPs) displayed overwhelming superiority in catalysis towards the corresponding bulk-phase materials; nevertheless, how to further improve catalytic activity was still an ongoing subject. Herein, we have combined one-step redox reaction and following freeze-dried technology to construct the quinary reduced graphene oxide nanosheets (rGS)/Fe2O3-PdPt/polypyrrole (PPy) hydrogels. Compared with traditional catalysts, their catalytic property was improved via two ways: construction of three-dimensional (3D) rGS hydrogels instead of two-dimensional rGS and synthesis of bimetallic alloys instead of monometallic NPs. The highly dispersed PdPt with diameter as small as 3.2 nm uniformly loaded on hydrogel surface. Due to special interconnected and porous structure, the reactants were easily adsorbed in hydrogels and contacted with PdPt alloys. To explain the contributions of bimetallic alloys and 3D rGS structure on enhanced catalytic activity, the catalytic property of quinary hydrogels was compared with reference samples. Besides superior activity, they also displayed good reusability, since hydrogels could be magnetically recycled owing to the existence of Fe2O3 NPs.