通过活性位点优化，战略性地设计了NiSe/Co(OH)2异质结构，用于高效尿素电氧化

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2025-03-17 DOI:10.1016/j.ijhydene.2025.03.214

Pooja V. Chavan , Pramod V. Rathod , Harshad A. Bandal, Hern Kim

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引用次数: 0

摘要

用尿素氧化取代阳极水氧化反应具有双重优势：显著降低制氢成本，解决富尿素废水处理问题。尽管如此，尿素氧化反应（UOR）的缓慢动力学要求创造具有更高效率和长期稳定性的先进电催化剂。在这项研究中，我们报道了一种新的异质结构电催化剂，该催化剂由电沉积法合成，由涂有氢氧化钴[Co(OH)2]薄片的硒化镍（NiSe）棒组成。合理设计的NiSe/Co(OH)2异质结构利用界面上的协同相互作用来提高催化性能。异质结构内部的强电子耦合促进了有效的电荷转移，而异质结诱导电荷重新分布并建立了内置电场，从而加速了反应动力学，改善了尿素吸附。与单个组分相比，NiSe/Co(OH)2异质结构表现出更强的催化活性，在10 mA cm−2时达到1.35 V的起始电位，Tafel斜率为52.9 mV dec−1。该电催化剂在1.4 V下的周转频率为6.5 × 10−3 s−1，突出了其特殊的固有活性。此外，它还保持了显著的稳定性，在10 mA cm−2下连续工作24小时，性能下降可以忽略不计。这些结果突出了NiSe/Co(OH)2异质结构作为通过尿素分解制氢和废水处理的经济耐用的解决方案的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Strategically engineered NiSe/Co(OH)2 heterostructure via active site optimization for efficient urea electrooxidation

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Strategically engineered NiSe/Co(OH)2 heterostructure via active site optimization for efficient urea electrooxidation

Replacing the anodic water oxidation reaction with urea oxidation offers a dual advantage: significantly lowering the cost of hydrogen (H₂) production and addressing urea-rich wastewater treatment. Nonetheless, the sluggish kinetics of the urea oxidation reaction (UOR) call for the creation of advanced electrocatalysts with improved efficiency and long-term stability. In this study, we report a novel heterostructure electrocatalyst comprising nickel selenide (NiSe) rods coated with cobalt hydroxide [Co(OH)₂] flakes, synthesized via electrodeposition. The rationally engineered NiSe/Co(OH)₂ heterostructure leverages synergistic interactions at the interface to enhance catalytic performance. Strong electronic coupling within the heterostructure promotes efficient charge transfer, while the heterojunction induces charge redistribution and establishes a built-in electric field, leading to accelerated reaction kinetics and improved urea adsorption. Compared to its individual components, the NiSe/Co(OH)₂ heterostructure demonstrates superior catalytic activity, achieving an onset potential of 1.35 V at 10 mA cm⁻² and a Tafel slope of 52.9 mV dec⁻¹. The electrocatalyst also exhibits an impressive turnover frequency of 6.5 × 10⁻³ s⁻¹ at 1.4 V, highlighting its exceptional intrinsic activity. Furthermore, it maintains remarkable stability, with negligible performance degradation over 24 h of continuous operation at 10 mA cm⁻². These results highlight the promise of the NiSe/Co(OH)₂ heterostructure as a cost-effective and durable solution for hydrogen production and wastewater treatment through urea decomposition.

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.