Molybdenum carbide nanosheets with iron doping as electrocatalysts for highly efficient ammonia electrosynthesis

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2024-10-26 DOI:10.1016/j.jelechem.2024.118749

Muhammad Adnan Younis , Ahmed I. Osman , Amjad Ali , Fazal Haq , Tariq Aziz , Mehwish Kiran , Iffat Ayesha Khan , Rizwan Wahab , Saira Manzoor

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Abstract

The electrochemical reduction of nitrogen to ammonia represents a greener alternative to the Haber-Bosch process, demanding a shift towards low-cost and high-efficiency electrocatalysts. Recent advances in research have demonstrated the potential of molybdenum carbide-based catalysts to have their unique electronic structure and physicochemical properties. This study introduces ultrathin iron-doped molybdenum carbide nanosheets (Fe-MoC) as a novel catalyst for ammonia electrosynthesis. Demonstrating a remarkable ammonia production rate of 16 µg h⁻¹ mg⁻¹ and a Faradaic efficiency (FE) of approximately 13 % at −0.2 V, our synthesized Fe-MoC nanosheets stand out for their superior catalytic activity and selectivity towards nitrogen activation. The indophenol technique was employed to identify the generation of NH₃ in our experiments, followed by UV–vis spectrometry for quantitative analysis. Additionally, various characterization techniques, including XRD, Raman, and XPS, were used to analyze the material structure and surface properties. Through comprehensive characterization and electrochemical studies, we reveal the pivotal role of iron doping in enhancing the electrocatalytic performance for nitrogen reduction reaction (NRR), offering insights into the mechanistic pathways facilitated by Fe-MoC. The future development and perspective of Fe-MoC towards high performance are proposed.

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掺杂铁的碳化钼纳米片作为高效氨电合成的电催化剂

用电化学方法将氮还原成氨是哈伯-博施工艺的一种更环保的替代方法，需要向低成本、高效率的电催化剂转变。最近的研究进展表明，碳化钼基催化剂具有独特的电子结构和物理化学特性。本研究将超薄铁掺杂碳化钼纳米片（Fe-MoC）作为一种新型催化剂用于氨的电合成。我们合成的铁-碳化钼纳米片在-0.2 V电压下的氨生产率高达16 µg h-1 mg-1，法拉第效率（FE）约为13%。我们在实验中采用了靛酚技术来确定 NH3 的生成，然后用紫外-可见光谱法进行定量分析。此外，我们还采用了 XRD、拉曼和 XPS 等多种表征技术来分析材料的结构和表面特性。通过全面的表征和电化学研究，我们揭示了铁掺杂在提高氮还原反应（NRR）电催化性能中的关键作用，为深入了解 Fe-MoC 的机理途径提供了启示。我们还提出了 Fe-MoC 走向高性能的未来发展方向和前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.