Rapid Fabrication of High-Entropy Ceramic Nanomaterials for Catalytic Reactions

Jie Xiang Yang, Bai Hao Dai, Ching Yu Chiang, I. Chia Chiu, Chih Wen Pao, Sheng Yuan Lu, I. Yu Tsao, Shou Tai Lin, Ching Ting Chiu, Jien Wei Yeh, Pai Chun Chang, Wei Hsuan Hung

Research output: Contribution to journalArticlepeer-review

46 Scopus citations

Abstract

Although high-entropy alloys have been intensively studied in the past decade, there are still many requirements for manufacturing processes and application directions to be proposed and developed, but most techniques are focused on high-entropy bulk materials and surface coatings. We fabricated high-entropy ceramic (HEC) nanomaterials using simple pulsed laser irradiation scanning on mixed salt solutions (PLMS method) under low-vacuum conditions. This method, allowing simple operation, rapid manufacturing, and low cost, is capable of using various metal salts as precursors and is also suitable for both flat and complicated 3D substrates. In this work, we engineered this PLMS method to fabricate high-entropy ceramic oxides containing four to seven elements. To address the catalytic performance of these HEC nanomaterials, we focused on CoCrFeNiAl high-entropy oxides applied to the oxygen-evolution reaction (OER), which is considered a sluggish process in water. We performed systematic material characterization to solve the complicated structure of the CoCrFeNiAl HEC as a spinel structure, AB2O4 (A, B = Co, Cr, Fe, Ni, or Al). Atoms in A and B sites in the spinel structure can be replaced with other elements; either divalent or trivalent metals can occupy the spinel lattice using this PLMS process. We applied this PLMS method to manufacture electrocatalytic CoCrFeNiAl HEC electrodes for the OER reaction, which displayed state-of-the-art activity and stability.

Original languageEnglish
Pages (from-to)12324-12333
Number of pages10
JournalACS Nano
Volume15
Issue number7
DOIs
StatePublished - 27 Jul 2021

Keywords

  • electrocatalyst
  • high-entropy ceramics
  • high-entropy nanomaterials
  • rapid mass production
  • spinels

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