Ultrathin IrRu nanocages with tunable electronic reciprocity for highly efficient water splitting in acidic media,Journal of Materials Chemistry A

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Ultrathin IrRu nanocages with tunable electronic reciprocity for highly efficient water splitting in acidic media
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-16 , DOI: 10.1039/d2ta08066d
Shangzhi Wang ₁ , Shan Yang ₁ , Ziqi Wei ₁ , Yujia Liang ₁ , Jiawei Zhu ₂ , Yawen Tang ₁ , Xiaoyu Qiu ₁

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The development of bifunctional electro-catalysts with high efficiency toward both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) in acidic media still remains a challenge. Herein, we report a seed-mediated growth and etching method to fabricate ultrathin Ir_xRu_1−x cubic nanocages with precisely controlled atom accuracy of six atomic layers (∼1.21 nm) and well-defined {200} facets. Tunable electronic reciprocity is achieved through a precise control over the ratio of Ir and Ru, thus simultaneously optimizing the HER and OER performance. The optimal electronic reciprocity is acquired at x = 0.5, and the resultant Ir_0.5Ru_0.5 nanocages exhibit a significantly low overpotential of 18 mV and 219 mV at 10 mA cm_geo⁻² (η₁₀) for the HER and OER in acidic medium, with 22.8 and 18.7 times higher mass activity in comparison with Pt/C and RuO₂, respectively. Meanwhile, remarkable durability is pledged at x ≥ 0.5 for Ir_xRu_1−x due to the electrochemical formation of Ir_xRu_1−xO₂ as active and stable phases for both the HER and the OER. Consequently, a home-made overall water splitting electrolyzer with Ir_0.5Ru_0.5 nanocage electrodes can steadily operate and afford η₁₀ as low as 1.472 V and outperforms state-of-the-art electrolyzers.

中文翻译：

具有可调电子互易性的超薄 IrRu 纳米笼可在酸性介质中高效分解水

开发对酸性介质中的析氢反应 (HER) 和析氧反应 (OER) 均高效的双功能电催化剂仍然是一个挑战。在此，我们报告了一种种子介导的生长和蚀刻方法，以制造超薄 Ir _x Ru _{1− x}立方纳米笼，具有六个原子层（~1.21 nm）和明确定义的 {200} 面的精确控制的原子精度。通过精确控制 Ir 和 Ru 的比例，实现可调电子互易性，从而同时优化 HER 和 OER 性能。在x = 0.5 时获得最佳电子互易性，得到 Ir _0.5 Ru _0.5_{对于酸性介质中的 HER 和 OER，纳米笼在 10 mA cm geo}^-2 ( η ₁₀ )时表现出 18 mV 和 219 mV 的显着低过电势，与 Pt/C 和 RuO ₂相比，质量活性高 22.8 和 18.7 倍，分别。同时，由于 Ir _x Ru ₁₋_x O ₂的电化学形成作为 HER 和 OER 的活性相和稳定相， Ir _x Ru ₁₋_x在x ≥ 0.5 时保证了显着的耐久性。因此，自制了 Ir _0.5 Ru _{0.5整体水分解电解槽}纳米笼电极可以稳定运行并提供低至 1.472 V 的η _{10 ，并且优于最先进的电解槽。}

更新日期：2022-11-16

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