Hierarchical electrode architectures for electrical energy storage & conversion.

Zavadil, Kevin Robert ; Missert, Nancy A. ; Shelnutt, John Allen ; van Swol, Frank B.

关键词: DENDRITES;    ELECTROCHEMISTRY;    ELECTRODES;    ENERGY STORAGE;    KINETICS;    MICROSCOPY;    MONTE CARLO METHOD;    NANOSTRUCTURES;    OXIDES;    PLATINUM;    POROSITY;    RIPENING;    SCANNING TUNNELING MICROSCOPY;    STABILITY;    VIABILITY;   

DOI  :  10.2172/1038175
RP-ID  :  SAND2012-0481
PID  :  OSTI ID: 1038175
Others  :  TRN: US201208%%564

学科分类：纳米科学和纳米技术

美国|英语

来源: SciTech Connect

【 摘 要 】

The integration and stability of electrocatalytic nanostructures, which represent one level of porosity in a hierarchical structural scheme when combined with a three-dimensional support scaffold, has been studied using a combination of synthetic processes, characterization techniques, and computational methods. Dendritic platinum nanostructures have been covalently linked to common electrode surfaces using a newly developed chemical route; a chemical route equally applicable to a range of metals, oxides, and semiconductive materials. Characterization of the resulting bound nanostructure system confirms successful binding, while electrochemistry and microscopy demonstrate the viability of these electroactive particles. Scanning tunneling microscopy has been used to image and validate the short-term stability of several electrode-bound platinum dendritic sheet structures toward Oswald ripening. Kinetic Monte Carlo methods have been applied to develop an understanding of the stability of the basic nano-scale porous platinum sheets as they transform from an initial dendrite to hole containing sheets. Alternate synthetic strategies were pursued to grow dendritic platinum structures directly onto subunits (graphitic particles) of the electrode scaffold. A two-step photocatalytic seeding process proved successful at generating desirable nano-scale porous structures. Growth in-place is an alternate strategy to the covalent linking of the electrocatalytic nanostructures.