通过迦尔瓦尼置换反应在不同的Ag+溶液中制备出了铜基银枝晶,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)和电化学工作站分别对样品的结构、微观形貌以及电化学性能进行了表征.结果表明,随着溶液中Ag+浓度和反应时间的增加,银的形貌从团簇状向树枝状转变,氧还原电催化性能也增强；在相同浓度Ag+溶液中,SO42-比NO3-更能促进枝晶的生长,但当阴离子是NO3-时比阴离子是SO42-时所制备的银枝晶的氧还原电催化性能更好；在10 mmol/L AgNO3溶液中,反应时间为1800 s时制备的银枝晶电极使H2O2的还原峰电流最大,在0.1mol/L Na2SO4+5mmol/L H,O2溶液中,恒电位为-0.32 V时,其稳态电流密度可达2.83 mA/cm2.初步提出了银枝晶的生长机制和H2O2的氧还原催化机制.
参考文献
| [1] | Liang Wang;Hongjing Wang;Yoshihiro Nemoto .Rapid and Efficient Synthesis of Platinum Nanodendrites with High Surface Area by Chemical Reduction with Formic Acid[J].Chemistry of Materials: A Publication of the American Chemistry Society,2010(9):2835-2841. |
| [2] | R. K. Raman;N. A. Choudhury;A. K. Shukla .A High Output Voltage Direct Borohydride Fuel Cell[J].Electrochemical and solid-state letters,2004(12):A488-A491. |
| [3] | Watt, J.;Cheong, S.;Toney, M.F.;Ingham, B.;Cookson, J.;Bishop, P.T.;Tilley, R.D. .Ultrafast growth of highly branched palladium nanostructures for catalysis[J].ACS nano,2010(1):396-402. |
| [4] | Bessette R R;Cichon J M;Dischert D W et al.A study of cathode catalysis for the aluminium/hydrogen peroxide semi-fuel cell[J].Journal of Power Sources,1999,80:248-253. |
| [5] | Wei J L;Wang X Y;Wang Y et al.Carbon-supported Au hollow nanospheres as anode catalysts for direct borohydride hydrogen peroxide fuel cells[J].Energy and Fuels,2009,23(08):4037-4041. |
| [6] | R.K. Raman;S.K. Prashant;A.K. Shukla .A 28-W portable direct borohydride-hydrogen peroxide fuel-cell stack[J].Journal of Power Sources,2006(2):1073-1076. |
| [7] | Lifeng Gu;Nie Luo;George H. Miley .Cathode electrocatalyst selection and deposition for a direct borohydride/hydrogen peroxide fuel cell[J].Journal of Power Sources,2007(1):77-85. |
| [8] | Weiqian Yang;Shaohua Yang;Wei Sun;Gongquan Sun;Qin Xin .Nanostructured palladium-silver coated nickel foam cathode for magnesium-hydrogen peroxide fuel cells[J].Electrochimica Acta,2006(1):9-14. |
| [9] | Bessette R R;Medeiros M G;Patrissi C J et al.Development and characterization of novel carbon fiber based cathode for semi-fuel cell application[J].Journal of Power Sources,2001,96:240-244. |
| [10] | Steven C. Amendola;Per Onnerud;Michael T. Kelly .A novel high power density borohydride-air cell[J].Journal of Power Sources,1999(1):130-133. |
| [11] | Yang W Q;YangS H;Sun W et al.Nanostructured silver catalyzed nickel foam cathode for an aluminum-hydrogen peroxide fuel cell[J].Journal of Power Sources,2006,160:1420-1424. |
| [12] | Stewart KL;Gewirth AA .Mechanism of electrochemical reduction of hydrogen peroxide on copper in acidic sulfate solutions[J].Langmuir: The ACS Journal of Surfaces and Colloids,2007(19):9911-9918. |
| [13] | Shunping Xie;Xicui Zhang;Dan Xiao .Fast Growth Synthesis of Silver Dendrite Crystals Assisted by Sulfate Ion and Its Application for Surface-Enhanced Raman Scattering[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2011(20):9943-9951. |
| [14] | Xiaogang Wen;Yu-Tao Xie;Martin Wing Cheung Mak;Xiao-Yuan Li;Kwan Yee Cheung .Dendritic Nanostructures of Silver:Facile Synthesis,Structural Characterizations,and Sensing Applications[J].Langmuir: The ACS Journal of Surfaces and Colloids,2006(10):4836-4842. |
| [15] | Fang JX;You HJ;Zhu C;Kong P;Shi M;Song XP;Ding BJ .Thermodynamic and kinetic competition in silver dendrite growth[J].Chemical Physics Letters,2007(1-3):204-208. |
| [16] | FangJ X;Ding B J;Song X P .Self-assembly ability of building units in mesocrystal,structural,and morphological transitions in Ag nanostructures[J].Growth Cryst Growth Des,2008,8:3616-3622. |
| [17] | Gu, CD;Ren, H;Tu, JP;Zhang, TY .Micro/Nanobinary Structure of Silver Films on Copper Alloys with Stable Water-Repellent Property under Dynamic Conditions[J].Langmuir: The ACS Journal of Surfaces and Colloids,2009(20):12299-12307. |
| [18] | Skoog D A;West D M;Holler F J.Fundamentals of analytical chemistry[M].Brooks/Cole:Belmont,Saunders College Publishing,2004:A12-A14. |
| [19] | Chang G;Jiang Z C Peng T Y et al.Preparation of high-specific-surface-area nanometer-sized alumina by sol-gel method and study on adsorption behaviors of transition metal ions on the alumina powder with 1CP-AES[J].Acta Chimica Sinica,2003,61:100-103. |
| [20] | Jalan V M;Taylor E J .Importance of interatomic spacing in catalytic reduction of oxygen in phosphoric acid[J].Journal of the Electrochemical Society,1983,130(11):2299-2302. |
| [21] | Savinova E R;Wasle S;Doblhofer K .Structure and activity relations in the hydrogen peroxide reduction at silver electrodes in NaF/NaOH electrolytes[J].Electrochimica Acta,1998,44:1341-1348. |
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