Despite that nickel–iron spinel (NiFe₂O₄) exhibits excellent oxygen evolution catalytic activity, its unsatisfactory mass transport limits further improvement in catalytic performance. Herein, we report an electrode with three-dimensional ordered macroporous NiFe₂O₄ on carbon cloth (3DOM-NiFe₂O₄/CC) for oxygen evolution reaction (OER). The ordered macropores endow the electrode with high porosity and short diffusion passages, which facilitate fast electrolyte flow and gas spillage, thereby enhancing the mass transport capability. Meanwhile, the highly conductive carbon cloth substrate enables the electrons to transfer rapidly through the electrode. Benefited from the excellent mass transport and electron mobility, the as-prepared electrode exhibited high catalytic activity with a small overpotential of 238 mV for a driving current density of 10 mA cm^–2 and a small Tafel slope of 57.2 mV dec^–1 for OER.

中文翻译：

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具有增强的传质能力的三维有序大孔NiFe ₂ O ₄自支撑电极，用于高效氧释放反应

尽管镍铁尖晶石（NiFe ₂ O ₄）表现出出色的氧释放催化活性，但其不令人满意的传质限制了催化性能的进一步提高。在此，我们报道了一种在碳布上具有三维有序大孔NiFe ₂ O ₄的电极（3DOM-NiFe ₂ O ₄/ CC）进行放氧反应（OER）。有序的大孔使电极具有高孔隙率和较短的扩散通道，从而促进了电解液的快速流动和气体的溢出，从而增强了质量传输能力。同时，高导电性的碳布基底使电子能够快速地通过电极转移。得益于出色的质量传输和电子迁移率，所制得的电极显示出高催化活性，对于10 mA cm ^–2的驱动电流密度，较小的过电位为238 mV，对于OER的Tafel斜率较小，为57.2 mV dec ^–1。