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<p>Electrochemical water splitting is a promising strategy for sustainable hydrogen production; however, it requires efficient and durable non-noble metal electrocatalysts. In this work, we report the controlled synthesis of two-dimensional (2D) CuCo₂O₄ nanosheets (CC-NS) via a Triton X-100-assisted hydrothermal method, highlighting a morphology-engineering approach for enhanced bifunctional catalysis. The surfactant-directed growth enables the formation of a porous, ultrathin spinel architecture composed of nanocrystalline domains with uniformly distributed Cu and Co species. Structural and surface analyses (XRD, FESEM, TEM, EDS, and XPS) confirm a phase-pure cubic spinel structure with mixed-valence Co²⁺/Co³⁺ and Cu²⁺ states, which contribute to improved interfacial charge transfer and catalytic activity. In 1&#xa0;M KOH, the CC-NS electrode delivers overpotentials of 280 mV for HER and 530 mV for OER at 50&#xa0;mA cm⁻², demonstrating competitive bifunctional performance at relatively high current densities. The enhanced activity is attributed to the synergistic interplay between nanosheet morphology, porous structure, and mixed-metal redox chemistry. This study provides a rational design strategy for developing morphology-controlled spinel oxides as cost-effective electrocatalysts for alkaline water splitting.</p>

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Two-dimensional copper cobaltate nanosheets as an efficient bifunctional electrocatalyst for water splitting

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • J. A. F. C. R. Rodrigues,
  • R. Suresh Babu,
  • Y. Sasikumar,
  • A. L. F. de Barros

摘要

Electrochemical water splitting is a promising strategy for sustainable hydrogen production; however, it requires efficient and durable non-noble metal electrocatalysts. In this work, we report the controlled synthesis of two-dimensional (2D) CuCo₂O₄ nanosheets (CC-NS) via a Triton X-100-assisted hydrothermal method, highlighting a morphology-engineering approach for enhanced bifunctional catalysis. The surfactant-directed growth enables the formation of a porous, ultrathin spinel architecture composed of nanocrystalline domains with uniformly distributed Cu and Co species. Structural and surface analyses (XRD, FESEM, TEM, EDS, and XPS) confirm a phase-pure cubic spinel structure with mixed-valence Co²⁺/Co³⁺ and Cu²⁺ states, which contribute to improved interfacial charge transfer and catalytic activity. In 1 M KOH, the CC-NS electrode delivers overpotentials of 280 mV for HER and 530 mV for OER at 50 mA cm⁻², demonstrating competitive bifunctional performance at relatively high current densities. The enhanced activity is attributed to the synergistic interplay between nanosheet morphology, porous structure, and mixed-metal redox chemistry. This study provides a rational design strategy for developing morphology-controlled spinel oxides as cost-effective electrocatalysts for alkaline water splitting.