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首页> 外文期刊>Inorganic Chemistry Frontiers >Influence of Zn and Co co-doping on oxygen evolution reaction electrocatalysis at MOF-derived N-doped carbon electrodes
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Influence of Zn and Co co-doping on oxygen evolution reaction electrocatalysis at MOF-derived N-doped carbon electrodes

机译：Zn和CO-掺杂对MOF衍生的N掺杂碳电极氧逸出反应电常分的影响

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摘要

Electrochemical conversion of water into oxygen and hydrogen gas is a highly efficient method to meet the energy requirement on a global scale and solve the global warming problem arising from the mass consumption of fossil sources. Therefore, it is important to develop a catalyst with excellent oxygen reduction reaction (OER) activity. In this paper, we adopted the cocrystallization technology to synthesize Zn1-xCox-ZIF composites. Then, the Zn1-xCox-ZIF composites were used as precursors to prepare the Zn1-xCox/NC electrocatalyst (NC is N-doped carbon). The influence of the Zn element on the Zn1-xCox/NC electrocatalyst for the oxygen reduction reaction has been explored. All as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results show that Zn1-xCox/NC electrocatalysts exhibit excellent OER activity. And the doping of Zn has a great influence on the structure and OER efficiency of the Zn1-xCox/NC electrocatalyst. After the pyrolysis process, the organic ligands of Zn1-xCox-ZIF are transformed into porous carbon and Zn and Co nanoparticles are formed inside the carbon. Among these Zn1-xCox/NC electrocatalysts, Zn0.2Co0.8/NC shows the highest OER activity. The carbon nanowires appearing on the surface of Zn0.2Co0.8/NC nanoparticles are much more compared to that on others. The overpotential and Tafel slope of Zn0.2Co0.8/NC are 1.52 V and 98 eV dec(-1), respectively. Zn0.2Co0.8/NC also exhibits outstanding long-term electrochemical durability. This finding can not only extend the application of MOFs, but can also present a new method for fabricating highly efficient OER electrocatalysts.
机译：水进入氧气和氢气的电化学转化是一种高效的方法，以满足全球规模的能量要求，解决了化石源大规模消耗所产生的全球变暖问题。因此，重要的是开发具有优异的氧还原反应（OER）活性的催化剂。在本文中，我们采用了CoCrystalization技术来合成Zn1-Xcox-ZIF复合材料。然后，使用Zn1-Xcox-ZIF复合材料作为前体以制备Zn1-Xcox / NC电催化剂（Nc是N-掺杂碳）。探讨了Zn元件对氧还原反应Zn1-Xcox / Nc电催化剂的影响。通过X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和X射线光电子谱（XPS）表征所有的样品。结果表明，Zn1-Xcox / NC电催化剂表现出优异的OER活动。 Zn的掺杂对Zn1-Xcox / NC电催化剂的结构和oer效率有很大影响。在热解过程之后，将Zn1-Xcox-Zif的有机配体转化为多孔碳，在碳内形成Zn和Co纳米颗粒。在这些Zn1-Xcox / NC电催化剂中，Zn0.2Co0.8 / NC显示了最高的OER活动。与其他相比，出现在Zn0.2CO0.8 / NC纳米颗粒表面上的碳纳米线。 Zn0.2Co0.8 / NC的过电和Tafel斜率分别为1.52 V和98EV Dec（-1）。 Zn0.2Co0.8 / NC还表现出出色的长期电化学耐久性。这一发现不仅可以扩展MOF的应用，而且还可以提出一种制造高效oer电催化剂的新方法。

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