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| 1 | 金属氧化物纳米催化的形貌效应显示文摘纳米结构催化剂的设计与制备是多相催化的核心问题之一.提高催化活性的传统方法是减小催化剂粒子的尺寸以暴露更多的表面活性位,即纳米催化中的尺寸效应,但这种方法往往带有一定程度的经验性和随机性.近年来,随着纳米材料科学的快速发展,在溶液体系中通过自下而上的合成技术已经可以在纳米尺度上有效调变固体催化剂粒子的形貌.通过纳米催化材料的形貌可控合成,可选择性地暴露高活性或特定能量晶面,从而大幅度提升催化反应活性、选择性和稳定性,也就是纳米催化中的形貌效应,这也是当前纳米催化研究的热点之一.本文以作者近年来研究的Co3O4、CeO2和Fe2O3为重点,总结了纳米结构金属氧化物在多相催化反应中的形貌效应,分析了氧化物暴露晶面的化学性质对催化性能的作用机制.这种基于形貌效应的纳米催化不仅加深了在纳米尺度甚至原子层次上对催化剂构-效关系的认知,而且对设计和开发实用高效催化剂也具有重要的理论价值. | 李勇 申文杰 | 2012 | 中国科学:化学2012，42，4： | 18 |
| 2 | Morphology-dependent nanocatalysis on metal oxides显示文摘The design and fabrication of solid nanomaterials are the key issues in heterogeneous catalysis to achieve desired performance.Traditionally,the main theme is to reduce the size of the catalyst particles as small as possible for maximizing the number of active sites.In recent years,the rapid advancement in materials science has enabled us to fabricate catalyst particles with tunable morphology.Consequently,both size modulation and morphology control of the catalyst particles can be achieved independently or synergistically to optimize their catalytic properties.In particular,morphology control of solid catalyst particles at the nanometer level can selectively expose the reactive crystal facets,and thus drastically promote their catalytic performance.In this review,we summarize our recent work on the morphology impact of Co3O4,CeO2 and Fe2O3 nanomaterials in catalytic reactions,together with related literature on morphology-dependent nanocatalysis of metal oxides,to demonstrate the importance of tuning the shape of oxide-nanocatalysts for prompting their activity,selectivity and stability,which is a rapidly growing topic in heterogeneous catalysis.The fundamental understanding of the active sites in morphology-tunable oxides that are enclosed by reactive crystal facets is expected to direct the development of highly efficient nanocatalysts. | LI Yong SHEN WenJie | 2012 | Science China Chemistry2012，55，12： | 11 |
| 3 | 多孔Co_3O_4纳米纤维的合成及电化学性能研究显示文摘采用微波水热法合成碱式碳酸钴纳米纤维,低温煅烧后得到多孔结构的Co_3O_4纳米纤维.利用XRD、SEM和TEM对热处理前后产物的物相和微观结构进行了研究;使用BET对煅烧前后样品的孔径分布及孔隙率进行了测试.结果表明:所制备的Co_3O_4纳米纤维为立方相,其直径为40~70nm、长度为2~4μm.纳米纤维由尺寸为20nm左右的颗粒聚集而形成多孔结构.多孔Co_3O_4纳米纤维的比表面积为61.89m^2·g^(-1).多孔Co_3O_4纳米纤维具有较高的比容量,在电流密度为100、200、500、800、1 000、2 000mA·g^(-1)时,其可逆容量分别为856、763、695、598、502、382 mAh·g^(-1).当电流返回100 mA·g^(-1)时,容量可再次达到850mAh·g^(-1)左右,表明多孔Co_3O_4纳米纤维具有较高的倍率容量和良好的循环可逆性. | 李翠艳 弓琴琴 王兴 张志成 刘起 王帅 | 2016 | 陕西科技大学学报(自然科学版)2016，34，6： | 2 |
| 4 | 片状多孔六边形四氧化三钴的制备表征与电容性能研究显示文摘利用水相合成和煅烧法制备了一种具有六边形结构的片状多孔四氧化三钴(Co_3O_4)材料,通过扫描电镜、X射线衍射仪和比表面-孔径分布分析仪分别表征了其形貌、晶相和比表面及孔径分布情况。采用循环伏安法、恒流充放电法和交流阻抗法考察了该Co_3O_4修饰玻碳电极(Nafion/Co_3O_4/GCE)的电化学性质。结果表明,在2.0 mol·L-1KOH溶液中,电位窗口为-0.4~0.4 V(vs. Hg/HgO)的范围内,该Co_3O_4在1.0 mA·cm^(-2)的电流密度下比容量达39.39 mF·cm^(-2),在5.5 mA·cm^(-2)的电流密度下经过1000次循环后比电容量从初始的25.02 mF·cm^(-2)上升至27.24 mF·cm^(-2),表现出良好的电容特性和稳定性。 | 门永玲 邹如意 罗贵铃 马欣莉 王思 王萌 孙伟 | 2019 | 海南师范大学学报(自然科学版)2019，32，1： | 2 |
| 5 | 多孔Co_3O_4纳米片的制备及其电化学性能研究显示文摘采用溶剂热法制备片状Co(CO3)0.5(OH).0.11H2O前驱物,经400℃煅烧2 h即可得到多孔Co3O4纳米片.通过场发射扫描电镜(FESEM)和透射电镜(HRTEM)观测了纳米片的形貌,利用X射线衍射(XRD)分析了纳米片的结构,通过循环伏安、恒流充放电和交流阻抗测试了材料的电化学电容性能.结果表明:多孔Co3O4纳米片厚度约为50 nm,孔径主要分布在10 nm左右;0.5 A/g恒流充放电情况下,比容量高达707 F/g,当电流密度高达8 A/g时比容量依然高达547 F/g;同时,该材料循环1 000次后,容量保持率为97.4%. | 刘密 韩莉锋 肖元化 张爱勤 刘少军 曹永博 李峰 | 2013 | 郑州大学学报(工学版)2013，34，3： | 2 |
| 6 | Co_3O_4 nanosheets:synthesis and catalytic application for CO oxidation at room temperature显示文摘Hexagonal β-Co(OH)2 nanosheets with edge length of 50 nm and thickness of 10 nm were hydrothermally synthesized with the aid of triethylamine.Upon calcination at 350°C in air,the β-Co(OH)2 nanosheets was converted into Co3O4 nanosheets with a similar dimension.Structural analyses during the calcination process identified that the β-Co(OH)2 precursor was initially dehydrated to HCoO2 and subsequently transferred into Co3O4.When being applied to catalyze CO oxidation at room temperature,the Co3O4 nanosheets exhibited a higher activity than the conventional spherical nanoparticles.This was perhaps related to the partial exposure of the{112}planes over the Co3O4 nanosheets.The porous structure generated during the calcination process also provided significant amounts of surface defects,which might contribute to the enhanced catalytic activity as well. | LV YongGe LI Yong TA Na SHEN WenJie | 2014 | Science China Chemistry2014，57，6： | 1 |
| 7 | Synthesis of Li-doped Co_3O_4 truncated octahedra with improved performances in CO oxidation and lithium ion batteries显示文摘Single-crystalline Li-doped Co3O4 truncated octahedra with different doping contents were synthesized by a simple combustion method with the fuel of multi-walled carbon nanotubes(MWCNTs).Controlled experiments showed that the pristine well-defined Co3O4 octahedra were obtained with exposed surfaces of {111} planes without lithium doping.In comparison with the octahedra,the truncated Co3O4 octahedra were composed of original {111} planes and extra {100} planes.It could be attributable to the selective adsorption of lithium ions on the {100} planes,making these planes with higher surface energy coexist with the crystal faces of {111}.Furthermore,the Li-doped truncated octahedra and undoped octahedra were used as catalysts in CO oxidation and as anode materials for Li-ion batteries(LIBs).The measurements exhibited that the Li-doped octahedra with added {100} crystal faces showed improved catalytic activity and electrochemical property because of the exposure of the higher energy faces of {100} and enhanced conductivity by Li doping. | JIN Hong CUI ZhiMin ZHOU Wei GUO Lin YANG ShiHe | 2013 | Science China(Technological Sciences)2013，56，1： | 0 |
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