Ir/Ni–NiO/CNT composites as effective electrocatalysts for hydrogen oxidation,Journal of Materials Chemistry A

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Ir/Ni–NiO/CNT composites as effective electrocatalysts for hydrogen oxidation
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2022-11-16 , DOI: 10.1039/d2ta07417f
Xiafang Ji ₁ , Peng Chen ₁ , Yuanjun Liu ₂ , Zhenyuan Ji ₁ , Hongbo Zhou ₁ , Caiyao Chen ₁ , Xiaoping Shen ₁ , Xiaoqi Fu ₁ , Guoxing Zhu ₁

Affiliation

Developing highly efficient non-Pt hydrogen oxidation (HOR) catalysts for use in alkaline solution is very important for anion-exchange membrane hydrogen–oxygen fuel cells. Herein, Ir/Ni–NiO/CNT composite catalysts were designed and prepared, in which carbon nanotubes (CNTs) were used as the support and iridium nanoparticles were anchored on the surface of Ni–NiO. In alkaline media, the as-prepared Ir/Ni–NiO/CNT catalyst exhibited excellent catalytic performance with a mass activity of 1.59 mA μg_Ir⁻¹ for HOR, which is superior to that of Ir/CNT and even commercial Pt/C catalysts. Experimental and theoretical calculation studies showed that the presence of Ni–NiO weakened the hydrogen binding energy on Ir sites, which facilitated the Volmer step for HOR and thus improved the catalytic activity.

中文翻译：

Ir/Ni-NiO/CNT 复合材料作为氢氧化的有效电催化剂

开发用于碱性溶液的高效非铂氢氧化 (HOR) 催化剂对于阴离子交换膜氢氧燃料电池非常重要。在此，设计并制备了 Ir/Ni-NiO/CNT 复合催化剂，其中碳纳米管 (CNT) 用作载体，铱纳米粒子固定在 Ni-NiO 表面。在碱性介质中，所制备的 Ir/Ni-NiO/CNT 催化剂表现出优异的催化性能，HOR 的质量活性为 1.59 mA μg _Ir^-1，优于 Ir/CNT 甚至商用 Pt/C 催化剂. 实验和理论计算研究表明，Ni-NiO 的存在削弱了 Ir 位点上的氢结合能，这促进了 HOR 的 Volmer 步骤，从而提高了催化活性。

更新日期：2022-11-16

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