作为碱性介质中增强氧进化反应电催化剂的锰钴氧氢氧化物纳米复合材料的绿色合成技术

Catalysts Pub Date : 2024-06-06 DOI:10.3390/catal14060369
Rajeh Alotaibi, M. Amer, P. Arunachalam, Saad G. Alshammari
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引用次数: 0

摘要

采用绿色合成方法制备了用于电催化的锰-氢氧化钴(MnCo-OOH)纳米复合材料。利用粉末 X 射线衍射分析(XRD)、傅立叶变换红外光谱(FT-IR)和场发射扫描电子显微镜(FESEM)对电催化剂进行了检测。在碱性介质中,应用循环伏安法和计时器分析评估了 MnCo-OOH 纳米复合材料的电催化特性。MnCo-OOH 的形态、结晶度和电化学活性之间存在很强的相关性。从电化学特性来看,沉积后的 MnCo-OOH 催化剂过电位明显降低,在 370 mV 时的 OER 电流密度达到 75 mA-cm-2,是 CoOOH 催化剂 19.7 mA-cm-2 的四倍,这表明 MnCo-OOH 催化剂具有更高的电催化 OER 特性。此外,MnCo-OOH 纳米复合材料在 1.0 M KOH 水电解液中 12 小时,在 1.55 和 1.60 VRHE 下的电流密度分别为 30 和 65 mA-cm-2。研究结果表明,所制备的 MnCoOOH 纳米复合材料将成为水电解中的一种合适的电催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Green Synthesis of Manganese-Cobalt Oxyhydroxide Nanocomposite as Electrocatalyst for Enhanced Oxygen Evolution Reaction in Alkaline Medium
Using green synthetic methods, a manganese-cobalt oxyhydroxide (MnCo-OOH) nanocomposite for electrocatalysis was prepared. Electrocatalysts were examined using powder X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), and field-emission scanning electron microscopy (FESEM). In an alkaline medium, cyclic voltammetry and chronoamperometric analysis were applied to assess the electrocatalytic features of the MnCo-OOH nanocomposite. A strong correlation existed between MnCo-OOH’s morphology, crystallinity, and electrochemical activity. Upon examining the electrochemical characteristics, the as-deposited MnCo-OOH catalyst demonstrated a significantly lower overpotential, achieving 75 mA·cm−2 OER current density at 370 mV, four times larger than 19.7 mA·cm−2 for CoOOH catalysts, signifying that the MnCo-OOH catalyst exhibits a higher electrocatalytic OER features. In addition, the MnCo-OOH nanocomposite demonstrated a high current density of 30 and 65 mA·cm−2 at 1.55 and 1.60 VRHE for 12 h in 1.0 M KOH aqueous electrolyte. As a result of this study, it was determined that the fabricated MnCo-OOH nanocomposite would be an appropriate electrocatalyst in water electrolysis.
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