Phase-Bridged Hierarchical Catalysts for Efficient and Stable Water Electrolysis

Yihan Zhang, Sangjin Lee, Seulgi Jeong, Eunbin Son, Jeong Min Baik, Young Kyu Han, Hyesung Park

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The design and synthesis of low-cost electrocatalysts with high catalytic activity and long-term stability is a challenging task. This study utilizes a combination of electronic tuning and surface reconstruction to synthesize a ternary layered double hydroxide (LDH)/phosphide (P−NiCuFe−LDH) hierarchical-structure catalyst that improves the kinetics of the hydrogen/oxygen evolution reactions in water electrolysis by facilitating the thermodynamically limited reaction pathways. Spectroscopic analyses indicate synergistic electronic interactions among the metal atoms in the LDH and phosphide layers via the P-bridge effect. This cross-layer interaction optimizes the electron transport pathways and reaction kinetics, enabling the proposed hierarchical electrocatalyst to exhibit high intrinsic activity. Theoretical calculations confirm the configuration of the cross-phase bridges and elucidate the origin of the enhanced electrocatalytic effect of P−NiCuFe−LDH. For overall water splitting, the P−NiCuFe0.06−LDH || P−NiCuFe0.06−LDH system requires only 1.517 V to attain a current density of 10 mA cm−2. The P−O-containing surface (generated in situ during water electrolysis) prevents metal-ion leaching and endows P−NiCuFe−LDH with excellent operational stability; as demonstrated by the continuous long-term stability test over 1000 h with negligible performance degradation. This study provides important insights into the design of rational hierarchical structures for a wide range of applications beyond water splitting.

Original languageEnglish
Article number2309250
JournalAdvanced Functional Materials
Volume34
Issue number7
DOIs
StatePublished - 12 Feb 2024

Keywords

  • bifunctional electrocatalyst
  • cross-phase bridge
  • hierarchical structure
  • overall water splitting
  • surface reconstruction

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