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首页> 外文期刊>RSC Advances >A facile fabrication method for ultrathin NiO/Ni nanosheets as a high-performance electrocatalyst for the oxygen evolution reaction
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A facile fabrication method for ultrathin NiO/Ni nanosheets as a high-performance electrocatalyst for the oxygen evolution reaction

机译：一种超薄的NiO / Ni纳米片的简便制备方法，作为氧析出反应的高性能电催化剂

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摘要

In order to realize the oxygen evolution reaction (OER) with high efficiency on a large scale, a facile method has been created to fabricate NiO/Ni nanosheets by repeated size reduction and thermal oxidation on the surface. By using ultrathin Ni nanosheets with thicknesses of around 4?nm and different temperatures of thermal treatment, tunable oxidation of the metallic nanosheets was achieved. This was proven to have a great impact on the catalysts' electrical conductivity and activity. The NiO/Ni two-dimensional (2D) nano-metal catalyst prepared at 250 °C possesses a potential of 1.59 V (vs. RHE) at the current density of 100 mA cm?2 in 1 M KOH solution, and still exhibits a high performance after 15?000 cycles. Furthermore, the enhanced electrical conductivity and exposure of active sites contribute to a kinetically low-cost process, resulting in a Tafel slope of 51 mV dec?1. The repeated folding and calendering method is a mature industrial manufacturing procedure, and therefore this creative repeated size reduction and thermal oxidation production process for oxide/metal nanosheets has the potential to be extended to various kinds of metal materials that could be used to produce electrocatalysts in high yields.
机译：为了大规模高效地实现氧释放反应（OER），已经开发了一种通过在表面上反复进行尺寸减小和热氧化来制造NiO / Ni纳米片的简便方法。通过使用厚度约4？nm的超薄镍纳米片和不同的热处理温度，可以实现金属纳米片的可调节氧化。事实证明，这对催化剂的电导率和活性有很大的影响。在250°C下制备的NiO / Ni二维（2D）纳米金属催化剂在电流密度为100 mA cm时具有1.59 V（ vs。 RHE）的电势。在1 M KOH溶液中 2 ，并且在15 000次循环后仍显示出高性能。此外，增强的电导率和活性位点的暴露有助于降低动力学过程，导致Tafel斜率为51 mV dec ？1 。重复的折叠和压延方法是一种成熟的工业生产方法，因此，这种创造性的氧化物/金属纳米片的重复尺寸缩小和热氧化生产工艺具有扩展到可用于生产电催化剂的各种金属材料的潜力。高产。

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