用于碱性介质中析氧反应的高效 Mn-Ni-Co 纳米复合材料基电催化剂,Journal of the Chinese Chemical Society

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用于碱性介质中析氧反应的高效 Mn-Ni-Co 纳米复合材料基电催化剂
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2021-10-13 , DOI: 10.1002/jccs.202100386
Abdul Qayoom Mugheri ₁ , Ali Asghar Sangah ₂ , Aijaz otho ₃ , Shahzad Ahmed Memon ₄ , Khaled H. Mahmoud ₅ , Zeinhom M. El‐Bahy ₆

Affiliation

由于化石燃料的频繁使用及其对环境的直接影响，当今时代本质上需要新的能源生产方式。氢是可再生能源的完美候选者；然而，高效的 O ₂气体生产与缺乏活性电催化剂有关，该催化剂成本低且与贵金属 RuO ₂的性能相当。新开发的复合材料的 Tafel 斜率为 65 mV dec ^-1用于非贵重 Mn-Ni-Co 基电催化剂的析氧反应 (OER)。这种混合氧化物合金与复合材料在碱性介质中具有优异的析氧活性。最适合在 1 M KOH 介质中以 1.41 V 起始电位、230 mV 过电位产生 OER，并且催化剂高度耐用 40 小时。电化学阻抗谱研究有力地提供了 86.5 Ω 电荷转移电阻的快速 OER 动力学。大规模生产廉价的代氧气需要活性催化剂。因此，非常需要性能优异、稳定且廉价的催化剂 O ₂电解水通过析氧产生气体。在此，我们首次提出了一种基于过渡金属氧化物三元 Mo-Ni-Co 纳米结构及其复合材料的高效且高度稳定的催化剂，用于在碱性条件下分解水。所提出的催化剂达到了氧化钌性能的标志，并且优于几种过渡金属二硫属化物。通过克服催化边缘少、密度低和导电性差的问题，这种制造技术是开发活性和可扩展的析氧催化剂的新路线图。由于 173.20 Ω 的小电荷转移电阻值和 1.97 mF 的电容值，获得的结果表明 Mn-Ni-Co 对 OER 非常有利。

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Efficient Mn-Ni-Co nanocomposite–based electrocatalyst for oxygen evolution reaction in alkaline media

Due to the frequent use of fossil fuels and their direct impact on the environment, new ways of production of energy sources are essentially needed for the current era. Hydrogen is the perfect candidate for renewable energy; however, efficient O₂ gas production is associated with a lack of active electrocatalysts that could be low cost effective and comparable to the performance of noble metal RuO₂. The newly developed composite has a Tafel slope of 65 mV dec⁻¹ for oxygen evolution reaction (OER) for the nonprecious Mn-Ni-Co-based electrocatalyst. This mixed oxide alloy possesses excellent oxygen evolution activity in alkaline media with the composite material. It is best of fit to produce OER in 1 M KOH media at 1.41 V onset potential, 230 mV overpotential, and the catalyst is highly durable for 40 hr. The electrochemical impedance spectroscopy study strongly provides the fast OER kinetics of 86.5 Ω charge transfer resistance. An active catalyst is needed for the cheaper generation oxygen gas production on large scale. Thus, outperform, stable, and inexpensive catalysts are highly demanded O₂ gas production from the electrolysis of water through oxygen evolution. Herein, we present an efficient and highly stable catalyst based on transition metal oxide ternary Mo-Ni-Co nanostructures and their composite for water splitting in basic conditions for the first time. The presented catalysts are up to the mark of ruthenium oxide performance and superior to several transition metal dichalcogenides. This fabrication technology is a new roadmap for the development of active and scalable oxygen-evolving catalysts by overcoming the issues of fewer catalytic edges, low density, and poor conductivity. The obtained results demonstrate highly favorable on the Mn-Ni-Co for OER due to 173.20 Ω small charge transfer resistance values and 1.97 mF capacitance values.

更新日期：2021-10-13

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