【作者】 尚卷卷； 谢贝贝； 张人杰；

【Author】 Shang Juanjuan;Xie Beibei;Zhang Renjie;Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of the P.R.China,Shandong University;

【机构】 山东大学； 山东大学胶体与界面化学教育部重点实验室；

【摘要】 本工作中首先优选小尺寸氧化石墨烯（grapheneoxide,GO）的制备方法,得到横向尺寸30-500nm的GO并以其为模板,在水溶液中利用GO被KMnO₄氧化产生的CO₂等产物鼓胀KMnO₄的还原产物MnO₂,快速冷冻干燥得到了具有大比表面（228.2 m²/g）的、直径为30-500 nm的超薄MnO2纳米空心球1,厚仅3.7 nm的球壁由5层δ-MnO₂晶型的[MnO₆]晶胞组成,界面晶胞利用率高,催化降解有机物的单位降解量15倍于文献报道的最大值。以多巴胺（dopamine,DA）和不同尺寸GO作为前驱体,调控了氮掺杂石墨烯气凝胶（nitrogen-doped graphene aerogels,NGAs）的孔径和比表面,提出了由小尺寸GO形成的致密小孔结构是实现低检测限、宽线性范围电催化同步检测包括痕量DA生物分子多组分的关键因素2。通过小孔NGA诱导产生并负载了具有优势暴露（111）晶面的、抗毒性超薄Pt纳米片,其表面Pt原子比高达28%,故高效电催化氧化甲醇3。本工作有助于优选尺寸、缺陷不同的GO的制备方法,发展基于GO的可控组装、灵敏生物检测和高性能催化剂。更多还原

【Abstract】 This work first focuses on optimal preparation of GO,obtaining GO nanosheets with lateral size of 30-500 nm as template,and synthesizing ultrathin MnO2 hollow nanoballoons which show 15 times of the reported highest catalytic activity for decomposing the organic dye methylene blue.By using dopamine（DA） and different sizes of GO as precursors,3 D nitrogen-doped graphene aerogels（NGAs） with effectively tunable porosity and specific surface area are assembled.The smallest GO is demonstrated to be the most important for packing the most densely and to enable the NGA the smallest pore size and the best electrocatalytic activities including the lowest detection limit and the largest linear range.Such a NGA is also used to induce the formation and loading of ultrathin Pt（111）NPTs with preferentially exposed poison-resistant Pt₁₁₁ lattice.The Pt₁₁₁NPTs with so large a ratio（28 %） of surface active to sum Pt atoms show high efficiency in electrocatalytic oxidization of methanol.This project helps to make good use of GO in developing controlled assembly,sensitive bioassay and high-performance catalysts更多还原