草酸根作用下Co_3O_4八面体的控制合成
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摘要
在草酸根的作用下,采用水热法合成了暴露八个(111)晶面的Co_3O_4八面体。采用XRD、SEM、TEM和HRTEM等手段对产物进行了表征和分析,结果表明该Co_3O_4八面体呈立方晶相且具有很高的结晶性。详细研究了反应时间、反应温度、草酸根浓度等反应条件对Co_3O_4形貌的影响。研究表明草酸根可选择吸附在Co_3O_4的(111)晶面,通过其较大的空间位阻限制(111)晶面的生长,从而使该晶面得以最终暴露。由于(111)晶面具有较高的能量,该Co_3O_4八面体具有良好的高氯酸铵(AP)催化热分解性能。
Co_3O_4 octahedra exposing eight( 111) facets were hydrothermally synthesized with the assistance of C_2O_4~(2-). The prepared samples were characterized and analyzed by means of XRD,SEM,TEM and HRTEM. The results indicate that the Co_3O_4 octahedra exhibited cubic phase with high crystallinity. The influence of reaction time,reaction temperature and C_2O_4~(2-) concentration on the morphology of Co_3O_4 were investigated in detail. It is prove that C_2O_4~(2-) would preferably adsorb on the( 111) facets of Co_3O_4 nuclei,which would then restrict the further growth of( 111) facets due to the larger space of C_2O_4~(2-) than hydroxyl groups leading to the exposure of( 111) facets. The present Co_3O_4 octahedra could catalyze the thermal decomposition of ammonium perchlorate( AP) effectively due to the exposure of high energy facets.
Co_3O_4 octahedra exposing eight( 111) facets were hydrothermally synthesized with the assistance of C_2O_4~(2-). The prepared samples were characterized and analyzed by means of XRD,SEM,TEM and HRTEM. The results indicate that the Co_3O_4 octahedra exhibited cubic phase with high crystallinity. The influence of reaction time,reaction temperature and C_2O_4~(2-) concentration on the morphology of Co_3O_4 were investigated in detail. It is prove that C_2O_4~(2-) would preferably adsorb on the( 111) facets of Co_3O_4 nuclei,which would then restrict the further growth of( 111) facets due to the larger space of C_2O_4~(2-) than hydroxyl groups leading to the exposure of( 111) facets. The present Co_3O_4 octahedra could catalyze the thermal decomposition of ammonium perchlorate( AP) effectively due to the exposure of high energy facets.
引文
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[3]Wang J Y,Yang N L,Tang H J,et al.Accurate Control of Multishelled Co3O4Hollow Microspheres as High Performance Anode Materials in Lithium-Ion Batteries[J].Angewandte Chemie,2013,125:6545-6548.
[4]朱振峰,吕景,刘辉,等.形貌可控Co3O4纳米晶的水热合成及表征[J].人工晶体学报,2015,44(11):2988-2993.
[5]程魁,杨帆,闫鹏,等.Co3O4纳米片的制备及对H2O2电还原反应的催化性能[J].高等学校化学学报,2014,35(1):110-114.
[6]Li Y G,Tan B,Wu Y Y.Mesoporous Co3O4Nanowire Arrays for Lithium Ion Batteries with High Capacity and Rate Capability[J].Nano Letters,2008,8:265-270.
[7]金小青,杨彬,冯晓娟.Co3O4纳米颗粒的制备及其电化学性能[J].化学通报,2013,76(3):249-254.
[8]孙灵娜,王小慧,王强.水热法合成四氧化三钴纳米材料[J].材料科学与工程学报,2011,29(1):17-20.
[9]刘霞,梁彩琴,第五江涛,等.花状Co3O4纳米颗粒的制备及其超级电容性能的研究[J].化工新型材料,2017,45(1):124-126.
[10]Zhou H,Lv B L,Wu D,et al.Synthesis of Polycrystalline Co3O4Nanowires with Excellent Ammonium Perchlorate Catalytic Decomposition Property[J].Materials Research Bulletin,2014,60:492-497.
[11]Zhu J Z,Ren X D,Liu J J,et al.Unraveling the Catalytic Mechanism of Co3O4for the Oxygen Evolution Reaction in a Li-O2Battery[J].ACS Catalysis,2015,5:73-81.
[12]Song K,Cho E,Kang Y M.Morphology and Active-Site Engineering for Stable Round-Trip Efficiency Li-O2Batteries:A Search for the Most Active Catalytic Site in Co3O4[J].ACS Catalysis,2015,5:5116-5122.
[13]Su D W,Dou S X,Wang G X.Single Crystalline Co3O4Nanocrystals Exposed with Different Crystal Planes for Li-O2Batteries[J].Scientific Reports,2014,4:5767.
[14]Xiao X L,Liu X F,Zhao H,et al.Facile Shape Control of Co3O4and the Effect of the Crystal Plane on Electrochemical Performance[J].Advanced Functional Materials,2012,24:5762-5766.
[15]Zhou H,Lv B L,Wu D,et al.Synthesis and Properties of Octahedral Co3O4Single Crystalline Nanoparticles Enclosed by(111)Facets[J].Cryst Eng Comm,2013,15:8337-8344.
[16]Zhou H,Kang M,Wu D,et al.Synthesis and Catalytic Property of Facet Controlled Co3O4Structures Enclosed by(111)and(113)Facets[J].Cryst Eng Comm,2016,18:5456-5462.
[17]Huang Z F,Zhao Y,Song Y H,et al.Solution Inheritance of Co C2O4·2H2O Rods to Nanoparticle-assembled Co3O4rods[J].Colloids and Surfaces A,2016,490:307-317.
[18]Chen Y C,Zhang Y G,Fu S Q.Synthesis and Characterization of Co3O4Hollow Spheres[J].Materials Letters,2007,61:701-705.
[19]Wang D W,Wang Q H,Wang T M.Morphology-controllable Synthesis of Cobalt Oxalates and Their Conversion to Mesoporous Co3O4Nanostructures for Application in Supercapacitors[J].Inorganic Chemistry,2011,50:6482-6492.
[20]Kang M,Zhou H,Wu D,et al.Systematic Shape Evolution of Co3O4Nanocrystals from Octahedra to Spheres under the Influence of C2O2-4and PVP[J].Cryst.Eng.Comm.,2016,18:9299-9306.