Effects of dealloying and heat treatment parameters on microstructures of nanoporous Pd

doi:10.1016/j.jmst.2020.03.012

摘要/Abstract

Abstract:

Microstructures of nanoporous Pd are essentially important for its physical and chemical properties. In this work, we show that the microstructures of nanoporous Pd can be tuned by adjusting compositions of the precursor alloys, and dealloying and heat treatment parameters. Both the ligament and pore sizes decrease with increasing the electrochemical potential upon dealloying and the concentration of noble component in the precursor alloys. Heat treatment causes coarsening of the nanoporous structure. Above a critical temperature, the nanoporous structures are subjected to significant coarsening. Below the critical temperature, surface diffusion is believed to dominate the coarsening process. Above the critical temperature, the nanoporous structure coarsens remarkably at a rather high rate, which is ascribed to a multiple-mechanism controlled process.

Key words: Nanoporous metals, Microstructure, Dealloying, Kinetics, Coarsening

. [J]. 材料科学与技术, 2020, 48(0): 123-129.

Y.Z. Chen, X.Y. Ma, W.X. Zhang, H. Dong, G.B. Shan, Y.B. Cong, C. Li, C.L. Yang, F. Liu. Effects of dealloying and heat treatment parameters on microstructures of nanoporous Pd[J]. J. Mater. Sci. Technol., 2020, 48(0): 123-129.

图/表 6

Fig. 1. Typical microstructures of the nanoporous Pd dealloyed at different potentials (versus SCE) of (a) +0.2 V and (b) +0.25 V and (c) their corresponding ligament and pore sizes.

Fig. 2. Microstructures of the nanoporous Pd dealloyed under a potential of +0.3 V (versus SCE) with different precursor alloy compositions of (a) Pd15Co85, (b) Pd20Co80 and (c) Pd25Co75 and (d) their corresponding ligament and pore sizes.

Fig. 3. Typical microstructures of nanoporous Pd annealed for 3 h at (a) 200 °C and (b) 800 °C and (c) the evolution of dl as a function of Tann.

Fig. 4. Typical microstructures of nanoporous Pd annealed at 600 °C for (a) 30 min and (b) 60 min.

Fig. 5. Evolution of dl as a function of t at various temperatures: (a) 200 °C; (b) 400 °C; (c) 600 °C.

Fig. 6. Double logarithmic plots of d(t) versus t at (a) 200 °C, (b) 400 °C and (c) 600 °C.

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