The quest for sustainable and efficient energy conversion technologies has intensified research into advanced materials for electrochemical reactions, such as the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR). Transition metal oxides have emerged as promising catalysts due to their abundance, low cost, and adjustable electronic properties. Among these, Nickel (Ni)-based compounds are particularly noteworthy for their catalytic activity and stability. This research paper explores the crucial impact of Nickel (Ni) substitution and introducing porosity on the valence states of metal ions and their mass transport in the context of OER and MOR. In this study, we present a step-by-step surfactant (Brij 58) assisted synthesis approach for the preparation of mesoporous CoO and NiCoO. The synthesised material has been physiochemically characterised by Fourier transform Infrared Spectroscopy (FTIR), Scanning electron microscopic/Energy-dispersive X-ray spectroscopy (SEM/EDS) and High-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), and inductively coupled plasma mass spectrometry (ICP-MS) analyses. Additionally, the impact of these alterations on electrocatalytic activity, reaction kinetics, and electrochemical stability during OER/MOR has been explored by Cyclic Voltammetry (CV), Linear Sweep Voltammetry (LSV), Tafel, Electrochemical Impedance Spectroscopy (EIS) and chronoamperometric experiments. Mesoporous NiCoO exhibits exceptional electrocatalytic performance with current densities of 46.8 mA/cm for OER and 214.5 mA/cm for MOR at 550 mV. By shedding light on the intricate interplay between metal substitution, porosity, and valence states, this research aims to provide valuable insights for the evolution of enhanced cobaltite electrocatalysts for sustainable water splitting and MOR.

中文翻译：

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Ni取代和诱导孔隙率的协同效应：增强钴矿在碱性介质中对OER和MOR的电催化性能


对可持续、高效能源转换技术的追求加强了对电化学反应先进材料的研究，例如析氧反应（OER）和甲醇氧化反应（MOR）。过渡金属氧化物由于其丰富、低成本和可调节的电子性能而成为有前途的催化剂。其中，镍（Ni）基化合物因其催化活性和稳定性而特别值得注意。本研究论文探讨了镍 (Ni) 替代和引入孔隙率对 OER 和 MOR 背景下金属离子价态及其传质的关键影响。在这项研究中，我们提出了一种分步表面活性剂（Brij 58）辅助合成方法来制备介孔CoO和NiCoO。合成材料通过傅里叶变换红外光谱（FTIR）、扫描电子显微镜/能量色散X射线光谱（SEM/EDS）和高分辨率透射电子显微镜（HR-TEM）、X射线衍射（ XRD）和电感耦合等离子体质谱（ICP-MS）分析。此外，通过循环伏安法 (CV)、线性扫描伏安法 (LSV)、Tafel、电化学阻抗谱 (EIS) 和计时电流实验探索了这些变化对 OER/MOR 过程中电催化活性、反应动力学和电化学稳定性的影响。介孔 NiCoO 表现出卓越的电催化性能，在 550mV 下，OER 的电流密度为 46.8mA/cm2，MOR 的电流密度为 214.5mA/cm2。 通过揭示金属替代、孔隙率和价态之间复杂的相互作用，这项研究旨在为可持续水分解和 MOR 的增强钴矿电催化剂的发展提供有价值的见解。