In recent years, increasing attention has been paid to metal–organic frameworks by scientists working in the field of electrocatalytic material chemistry. Herein, using the hydrothermal method, ultrathin Ni/Co bimetallic metal–organic framework nanobelts that can be directly adopted as highly efficient electrocatalysts are prepared. The optimized Ni/Co ultrathin nanobelts can reach an onset potential of 0.939 V [these values are very close to those of Pt/C (0.940 V)] and show superior stability relative to that of Pt/C toward oxygen reduction reaction (ORR). Additionally, under the current density of 10 mA cm⁻², the Ni/Co ultrathin nanobelts show the potential of 1.478 V for oxygen evolution reaction (OER), which is much better than that of IrO₂, indicating the large potential of the metal–organic frameworks as a bifunctional oxygen catalyst in metal–air batteries. In addition, after OER and ORR, the color of the Ni/Co ultrathin nanobelts sample is slightly lighter, and it can be seen that the channel becomes blurred but still exists. The X‐ray diffraction, infrared spectrometry, and X‐ray photoelectron spectroscopy results for Ni/Co ultrathin nanobelts before and after catalysis are basically identical. The findings suggest that the ultrathin belt‐like structure and the synergy effect between Ni and Co are crucial for tuning the electrocatalytic activity.

中文翻译：

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超薄纳米带作为一种出色的双功能氧催化剂：洞悉双金属金属-有机骨架的结构细微变化和协同效应

近年来，从事电催化材料化学领域的科学家越来越关注金属有机框架。在本文中，使用水热法制备了可直接用作高效电催化剂的超薄Ni / Co双金属金属-有机骨架纳米带。优化的Ni / Co超薄纳米带可以达到0.939 V的启动电位[这些值非常接近Pt / C的电位（0.940 V）]，并且相对于Pt / C的氧还原反应（ORR）表现出优异的稳定性。 。此外，在10 mA cm ^-2的电流密度下，Ni / Co超薄纳米带显示出1.478 V的氧释放反应（OER）电位，这比IrO ₂的电位要好得多。，表明金属有机框架作为金属空气电池中的双功能氧催化剂的巨大潜力。另外，经过OER和ORR处理后，Ni / Co超薄纳米带样品的颜色略浅，可以看出通道变得模糊但仍然存在。Ni / Co超薄纳米带在催化前后的X射线衍射，红外光谱和X射线光电子能谱结果基本相同。研究结果表明，超薄的带状结构以及镍和钴之间的协同作用对于调节电催化活性至关重要。