高效析氧反应用无粘结剂四金属氧化物电催化剂的研制

M. Asad, Afzal Shah, F. Iftikhar, Rafia Nimal, J. Nisar, M. Zia
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引用次数: 0

摘要

水分解已经成为一种可持续、可再生和零碳的能源。水在电解过程中发生析氢反应(HER)和析氧反应(OER)。然而,在这些半电池反应中,OER需要更多的能量。因此,开发加速OER的高效催化剂是提高电解槽商业可行性的关键。典型的粘结剂如Nafion和PVDF不适合设计商用电催化剂,因为它们会降低导电性。因此,我们设计了一种新颖且具有成本效益的无粘结剂四金属(Co-Cu-Zn-Fe)氧化物催化剂,可有效催化OER。采用简便的电位动力学方法在氟掺杂氧化锡(FTO)换能器表面生长该催化剂。利用x射线衍射(XRD)、扫描电镜和能量色散x射线能谱对修饰电极的结构和形貌进行了表征。XRD分析证实了CoFe2O4和CuCo2O4的沉积以及Co-Fe和Co-Cu合金的形成。同样,EDX和SEM结果与XRD结果一致,表明FTO表面存在金属。采用线性扫描伏安法测试了催化剂在pH-13强碱性介质中加速OER的性能。该催化剂表现出惊人的OER催化性能,在10 mA cm−2电流密度下过电位仅为216 mV。此外,时间电位响应表明,所设计的催化剂在1.80 V的电位下稳定16小时。因此,所设计的催化剂是第一个在最低过电位下催化OER的高度稳定、高效和廉价的催化剂。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Development of a Binder-Free Tetra-Metallic Oxide Electrocatalyst for Efficient Oxygen Evolution Reaction
Water splitting has emerged as a sustainable, renewable and zero-carbon-based energy source. Water undergoes hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) during electrolysis. However, among these half-cell reactions, OER is more energy demanding. Hence, the development of efficient catalysts for speeding up OER is a key for boosting up the commercial viability of electrolyzers. Typical binders like Nafion and PVDF are not preferred for designing commercial electrocatalysts as they can compromise conductivity. Thus, we have designed a novel and cost-effective binder-free tetra-metallic (Co-Cu-Zn-Fe) oxide catalyst that efficiently catalyzes OER. This catalyst was grown over the surface of Fluorine doped tin oxide (FTO) transducer by a facile potentiodynamic method. The structure and morphology of the modified electrode were characterized by X-ray diffraction (XRD), scanning electron microscopy, and energy dispersive X-ray spectroscopy. XRD analysis confirmed the deposition of CoFe2O4 and CuCo2O4 along with alloy formation of Co-Fe and Co-Cu. Similarly, EDX and SEM results show the presence of metals at the surface of FTO in accordance with the results of XRD. Linear scan voltammetry was employed for testing the performance of the catalyst towards accelerating OER in strongly alkaline medium of pH-13. The catalyst demonstrated stunning OER catalytic performance, with an overpotential of just 216 mV at 10 mA cm−2 current density. Moreover, the chronopotentiometric response revealed that the designed catalyst was stable at a potential of 1.80 V for 16 h. Thus, the designed catalyst is the first example of a highly stable, efficient, and inexpensive catalyst that catalyzes OER at the lowest overpotential.
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