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Oxygen Reduction Electrode Properties of Oxide Nanosheet-based Materials

机译：基于氧化物纳米片材料的氧还原电极性能

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摘要

Two types of oxide nanosheet-based materials, a H_3O~+-exchanged layered titanate and restacked titania nanosheets (H_3O~+-RE) were synthesized by soft chemical methods, and their oxygen reduction reaction (ORR) activities were examined by semi-steady-state voltammetry with a rotating ring-disc electrode at 70°C in 0.05 M H_2SO_4. Both samples showed similar onset potentials of the ORR, ～ 0.50 vs. reversible hydrogen electrode, while the efficiencies (Eff_4) of the 4-electron reduction of oxygen depended on their nanostructures, i.e. the stacking morphology of nanosheets, specific surface area and kinds of cation between the nanosheets. Both H_3O~+ -form samples showed high Eff_4 values are compared with Cs~+ -form layered titanate.and the H~+-form restacked titania nanosheets. This reveals that the H_3O~+ions and the number of the active sites for ORR are related to the ORR activity. The H_3O~+-RE exhibited the best Eff_4 value (> 90%), which is comparable to that of a conventional 20 mass% Pt/C catalyst.
机译：通过软化学方法合成了两种类型的氧化物纳米液，一种H_3O〜+ -EXCHANCED层状钛酸盐和恢复的二氧化钛纳米片（H_3O〜+ -RE）合成，并通过半稳定地检查它们的氧还原反应（ORR）活性 - 在0.05M H_2SO_4的70°C下使用旋转环盘电极的伏安法。两种样品显示出类似的ORR，〜0.50与可逆氢电极的起始电位，而4-电子氧的效率（Eff_4）依赖于其纳米结构，即纳米液，比表面积和种类的堆叠形态纳米片之间的阳离子。 H_3O〜+-+-+-+-+-+-+-+ -4型样品均显示高EFF_4值与Cs〜+-+ -form层状钛酸盐进行比较。H〜+ -Form rescania nanoshss。这表明H_3O〜+离子和ORR的活性位点的数量与ORR活性有关。 H_3O〜+ -RE表现出最佳的EFF_4值（> 90％），其与传统的20质量％PT / C催化剂的催化剂相当。

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