Journal of Electrochemical Science and Technology

The Korean Electrochemical Society (한국전기화학회)
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One-Pot Electrochemical Synthesis of Hierarchical Porous Niobium

  • Joe, Gihwan (School of Materials Science and Engineering, Pusan National University) ;
  • Shin, Heon-Cheol (School of Materials Science and Engineering, Pusan National University)
  • Received : 2020.12.07
  • Accepted : 2020.12.22
  • Published : 2021.05.28
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Abstract

In this study, we report niobium (Nb) with hierarchical porous structure produced by a one-pot, HF-free electrochemical etching process. It is proved experimentally that a well-defined hierarchical porous structure is produced from the combination of a limited repetition of pulse etching and high concentration of aggressive anion (i.e., SO42-), which results in hierarchical pores with high order over 3. A formula is derived for the surface area of porous Nb as a function of the hierarchical order of pores while the experimental surface area is estimated on the basis of the electrochemical gas evolution rate on porous Nb. From the comparison of the theoretical and experimental surface areas, an in-depth understanding was gained about porous structure produced in this work in terms of the actual pore shape and hierarchical pore order.

Keywords

Acknowledgement

This work was supported by the National Research Foundation (NFR-2018R1A5A1025594) of the Ministry of Science and ICT.

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