Nanotubular Iridium–Cobalt Mixed Oxide Crystalline Architectures Inherited from Cobalt Oxide for Highly Efficient Oxygen Evolution Reaction Catalysis,ACS Applied Materials & Interfaces

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Nanotubular Iridium–Cobalt Mixed Oxide Crystalline Architectures Inherited from Cobalt Oxide for Highly Efficient Oxygen Evolution Reaction Catalysis
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-26 00:00:00 , DOI: 10.1021/acsami.7b12247
Areum Yu ₁ , Chongmok Lee ₁ , Myung Hwa Kim ₁ , Youngmi Lee ₁

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Here, we report the unique transformation of one-dimensional tubular mixed oxide nanocomposites of iridium (Ir) and cobalt (Co) denoted as Ir_xCo_1–xO_y, where x is the relative Ir atomic content to the overall metal content. The formation of a variety of Ir_xCo_1–xO_y (0 ≤ x ≤ 1) crystalline tubular nanocomposites was readily achieved by electrospinning and subsequent calcination process. Structural characterization clearly confirmed that Ir_xCo_1–xO_y polycrystalline nanocomposites had a tubular morphology consisting of Ir/IrO₂ and Co₃O₄, where Ir, Co, and O were homogeneously distributed throughout the entire nanostructures. The facile formation of Ir_xCo_1–xO_y nanotubes was mainly ascribed to the inclination of Co₃O₄ to form the nanotubes during the calcination process, which could play a critical role in providing a template of tubular structure and facilitating the formation of IrO₂ by being incorporated with Ir precursors. Furthermore, the electroactivity of obtained Ir_xCo_1–xO_y nanotubes was characterized for oxygen evolution reaction (OER) with rotating disk electrode voltammetry in 1 M NaOH aqueous solution. Among diverse Ir_xCo_1–xO_y, Ir_0.46Co_0.54O_y nanotubes showed the best OER activity (the least-positive onset potential, greatest current density, and low Tafel slope), which was even better than that of commercial Ir/C. The Ir_0.46Co_0.54O_y nanotubes also exhibited a high stability in alkaline electrolyte. Expensive Ir mixed with cheap Co at an optimum ratio showed a greater OER catalytic activity than pure Ir oxide, one of the most efficient OER catalysts.

中文翻译：

氧化钴继承的纳米管铱-钴混合氧化物晶体结构，用于高效氧释放反应催化

在这里，我们报告了铱（Ir）和钴（Co）的一维管状混合氧化物纳米复合材料的独特转变，表示为Ir _x Co _{1- x} O _y，其中x是相对于总金属含量的相对Ir原子含量。各种Ir中形成_X钴_{1- X} ø _ý（0≤ X ≤1）结晶管状纳米复合材料容易通过电纺丝和随后的煅烧过程来实现的。结构表征清楚地证实了Ir _x Co _{1– x} O _y多晶纳米复合材料具有由Ir / IrO ₂和Co ₃ O ₄组成的管状形态，其中Ir，Co和O均匀分布在整个纳米结构中。Ir _x Co _{1– x} O _y纳米管的容易形成主要归因于煅烧过程中Co ₃ O ₄的倾斜以形成纳米管，这可能在提供管状结构模板和促进形成中起关键作用。通过与Ir前驱体结合而产生IrO ₂。此外，所获得的Ir _x Co _1–_x的电活性通过在1 M NaOH水溶液中用转盘电极伏安法测定O _y纳米管的氧释放反应（OER）。在各种Ir _x Co _{1– x} O _y中，Ir _0.46 Co _0.54 O _y纳米管显示出最佳的OER活性（正电势最小，最大电流密度和低Tafel斜率），甚至比商品Ir更好。 /C。Ir _0.46 Co _0.54 O _y纳米管在碱性电解质中也表现出高稳定性。昂贵的Ir与廉价的Co以最佳比例混合后，比纯Ir氧化物（最有效的OER催化剂之一）显示出更高的OER催化活性。

更新日期：2017-09-26

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