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<p>The deployment of proton exchange membrane water electrolysis (PEMWE) necessitates efficient, stable, and low-Ir electrocatalysts for acidic oxygen evolution reaction (OER) at the anode. Herein, an IrO<sub><i>x</i></sub>/Ir-Co<sub>3</sub>O<sub>4</sub> heterostructure electrocatalyst is developed featuring bulk-doped Ir-Co<sub>3</sub>O<sub>4</sub> with surface-anchored IrO<sub><i>x</i></sub>, synthesized via a facile two-step electrochemical co-deposition process followed by programmed annealing. The IrO<sub><i>x</i></sub>/Ir-Co<sub>3</sub>O<sub>4</sub> catalyst requires an overpotential of only 237 mV to reach 10 mA/cm<sup>2</sup> and achieves a high mass activity of 230 A/g<sub>Ir</sub> at 1.5 V versus RHE. In a 1 cm<sup>2</sup> membrane electrode assembly electrolyzer (Pt/C∥IrO<sub><i>x</i></sub>/Ir-Co<sub>3</sub>O<sub>4</sub>), a cell voltage of only 1.773 V delivers 1 A/cm<sup>2</sup>, with stable operation exceeding 160 h at 200 mA/cm<sup>2</sup>. Moreover, a 100 cm<sup>2</sup> IrO<sub><i>x</i></sub>/Ir-Co<sub>3</sub>O<sub>4</sub> anode was fabricated, exhibiting performance comparable to that of its 1 cm<sup>2</sup> counterpart. Structural and computational analyses reveal that the synergy between bulk-doped Ir-Co<sub>3</sub>O<sub>4</sub> and surface anchored IrO<sub><i>x</i></sub> optimizes the electronic structure, thereby enhancing both catalytic activity and durability. This work provides a viable and scalable pathway for developing low-Ir electrocatalysts for practical PEMWE applications.</p>

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Scalable synthesis of an IrOx/Ir-Co3O4 heterostructure for efficient and stable acidic oxygen evolution

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Qi Wang,
  • Keyan Liu,
  • Wenhao Dong,
  • Xin Chen,
  • Wenmao Wang,
  • Jinpeng Fan,
  • Zixuan Zhang,
  • Shaohua Shen,
  • Jinjia Wei,
  • Jingshan Luo,
  • Jie Chen

摘要

The deployment of proton exchange membrane water electrolysis (PEMWE) necessitates efficient, stable, and low-Ir electrocatalysts for acidic oxygen evolution reaction (OER) at the anode. Herein, an IrOx/Ir-Co3O4 heterostructure electrocatalyst is developed featuring bulk-doped Ir-Co3O4 with surface-anchored IrOx, synthesized via a facile two-step electrochemical co-deposition process followed by programmed annealing. The IrOx/Ir-Co3O4 catalyst requires an overpotential of only 237 mV to reach 10 mA/cm2 and achieves a high mass activity of 230 A/gIr at 1.5 V versus RHE. In a 1 cm2 membrane electrode assembly electrolyzer (Pt/C∥IrOx/Ir-Co3O4), a cell voltage of only 1.773 V delivers 1 A/cm2, with stable operation exceeding 160 h at 200 mA/cm2. Moreover, a 100 cm2 IrOx/Ir-Co3O4 anode was fabricated, exhibiting performance comparable to that of its 1 cm2 counterpart. Structural and computational analyses reveal that the synergy between bulk-doped Ir-Co3O4 and surface anchored IrOx optimizes the electronic structure, thereby enhancing both catalytic activity and durability. This work provides a viable and scalable pathway for developing low-Ir electrocatalysts for practical PEMWE applications.