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Dealloyed yellow brass (CuZn37) has demonstrated promise as a porous support medium for various applications. This study focuses on vacuum dealloying of yellow brass prepared at varying temperatures. Dealloying allows more complete zinc removal compared to chemical methods enabling the evaluation of the microstructural evolution1,2. The resultant microstructure and porosity were analyzed using nano-computed tomography (nano-CT), revealing detailed morphological changes. It was found that increasing the dealloying temperature led to progressively coarsened pores, characteristic of Kirkendall void formation.
Characterization of the chemical changes occurring at different dealloying temperatures, employed atom probe tomography (APT), X-ray photoelectron spectroscopy (XPS), and energy-dispersive X-ray spectroscopy (EDX). These methods provided insights into elemental redistribution, surface composition, and porosity, offering a comprehensive understanding of the dealloying process and its effects on the material's properties, such as concentration of zinc around pores. The performance of these materials, including metrics such as charge capacity and cycling stability, is presented alongside chemical analysis of the electrodes post-cycling. This study elucidates the impact of dealloying temperature on microstructure and chemistry and also highlights the potential of vacuum dealloyed brass as an advanced material for energy storage applications.
