Abedi Mohsen, Rezaee Sharifeh, Shahrokhian Saeed
Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran.
Department of Chemistry, Sharif University of Technology, Tehran 11155-9516, Iran.
J Colloid Interface Sci. 2024 Jul 15;666:307-321. doi: 10.1016/j.jcis.2024.04.040. Epub 2024 Apr 6.
The pursuit of efficient and sustainable hydrogen production through water splitting has led to intensive research in the field of electrocatalysis. However, the impediment posed by sluggish reaction kinetics has served as a significant barrier. This challenge has inspired the development of electrocatalysts characterized by high activity, abundance in earth's resources, and long-term stability. In addressing this obstacle, it is imperative to meticulously fine-tune the structure, morphology, and electronic state of electrocatalysts. By systematically manipulating these key parameters, the full potential of electrocatalysts can unleash, enhancing their catalytic activity and overall performance. Hence in this study, a novel heterostructure is designed, showcasing core-shell architectures achieved by covering WN-WC nanowire arrays with tri-metallic Nickel-Cobalt-Iron layered triple hydroxide nanosheets on carbon felt support (NiCoFe-LTH/WN-WC/CF). By integrating the different virtue such as binder free electrode design, synergistic effect between different components, core-shell structural advantages, high exposed active sites, high electrical conductivity and heterostructure design, NiCoFe-LTH/WN-WC/CF demonstrates striking catalytic performances under alkaline conditions. The substantiation of all the mentioned advantages has been validated through electrochemical data in this study. According to these results NiCoFe-LTH/WN-WC/CF achieves a current density of 10 mA cm needs overpotential values of 101 mV for HER and 206 mV for OER, respectively. Moreover, as a bi-functional electrocatalyst for overall water splitting, a two-electrode device needs a voltage of 1.543 V and 1.569 V to reach a current density of 10 mA cm for alkaline water and alkaline seawater electrolysis, respectively. Briefly, this research with attempting to combination of different factors try to present a promising stride towards advancing bi-functional catalytic activity with tailored architectures for practical green hydrogen production via electrochemical water splitting process.
通过水分解来追求高效且可持续的制氢方法，已引发了电催化领域的深入研究。然而，反应动力学迟缓所带来的阻碍成为了一个重大障碍。这一挑战激发了对具有高活性、地球资源丰富且长期稳定性的电催化剂的研发。为应对这一障碍，精心微调电催化剂的结构、形态和电子态至关重要。通过系统地操控这些关键参数，可以释放电催化剂的全部潜力，提高其催化活性和整体性能。因此，在本研究中，设计了一种新型异质结构，展示了通过在碳毡载体（NiCoFe-LTH/WN-WC/CF）上用三金属镍钴铁层状双氢氧化物纳米片覆盖WN-WC纳米线阵列而实现的核壳结构。通过整合诸如无粘结剂电极设计、不同组分之间的协同效应、核壳结构优势、高暴露活性位点、高电导率和异质结构设计等不同优点，NiCoFe-LTH/WN-WC/CF在碱性条件下展现出显著的催化性能。本研究通过电化学数据验证了上述所有优点。根据这些结果，NiCoFe-LTH/WN-WC/CF实现10 mA cm的电流密度时，析氢反应（HER）的过电位值为101 mV，析氧反应（OER）的过电位值为206 mV。此外，作为用于全水分解的双功能电催化剂，对于碱性水电解和碱性海水电解，两电极装置分别需要1.543 V和1.569 V的电压才能达到10 mA cm的电流密度。简而言之，本研究试图通过结合不同因素，为通过电化学水分解过程实现实用的绿色制氢，朝着推进具有定制结构的双功能催化活性迈出有前景的一步。
