Highly selective and stable RuP2−MnP-NPC/CP nanocomposite as electrocatalyst for nitrate reduction to ammonia

IF 5.5 3区材料科学 Q1 ELECTROCHEMISTRY

Electrochimica Acta Pub Date : 2025-06-21 DOI:10.1016/j.electacta.2025.146747

Ya-Fei Guo , Sajid Mahmood , Anum Bilal , Noshin Afsan , Noor Hassan , Ali Bahadur , Shahid Iqbal , Syed Kashif Ali , Ahmad Asimov , M. Alhabradi , M. Alruwaili , Nouf M. Alyami , Abd-ElAziem Farouk , Peter Kasák

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引用次数: 0

Abstract

A significant challenge in the ecological production of ammonia (NH₃) as well as the mitigation of H₂O pollution lies in formulating robust electrocatalysts capable of facilitating the electrochemical reduction of nitrate while exhibiting high stability. An electrocatalyst characterized by high activity and durability was synthesized via pyrolysis to improve the efficiency of electrocatalytic nitrate reduction. This catalyst is composed of nanostructured ruthenium and manganese phosphide (RuP₂-MnP) nanocomposites integrated within nitrogen- and phosphorus-doped carbon (NPC) and affixed onto carbon paper (CP). Characterization results substantiate the formation of the nanostructured RuP₂−MnP-NPC and elucidate robust synergistic interactions among RuP₂, MnP, and NPC. Such interactions aid in the considerable increase in the overall catalytic sites, along with the improvement in electrical conductivity. By achieving a yield rate of ammonia of 1.67 mmol h^-1 cm^-2 and a Faradaic efficiency (FE) of 89.64 % at -1.6 V vs. SCE, the as-synthesized nanocomposite exhibits exceptional effectiveness in the electrocatalytic nitrate (NO₃⁻) reduction. Moreover, significant durability and prolonged stability were exhibited by the RuP₂−MnP-NPC/CP nanocomposite. Findings of a study involving isotope labeling procedures have been conducted, which indicated ammonia production was because of nitrate reduction. The RuP₂−MnP-NPC nanocomposite is an effective electrocatalyst for treating nitrate-polluted wastewater to efficiently extract ammonia. Aimed at various industrial purposes, this retrieved ammonia can successively be used, emphasizing the adaptability and efficacy of the nanocomposite in addressing environmental contaminants.

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高选择性稳定的RuP2-MnP-NPC/CP纳米复合材料作为硝酸还原制氨的电催化剂

在氨（NH3）的生态生产和水污染的缓解中，一个重大的挑战在于配制强大的电催化剂，既能促进硝酸盐的电化学还原，又能表现出高稳定性。为提高电催化还原硝酸盐的效率，采用热解法合成了一种高活性、耐久的电催化剂。该催化剂由纳米结构的磷化钌和锰（RuP₂- mnp）纳米复合材料组成，集成在氮和磷掺杂碳（NPC）中，并粘贴在碳纸（CP）上。表征结果证实了纳米结构RuP2-MnP-NPC的形成，并阐明了RuP2、MnP和NPC之间强大的协同作用。这种相互作用有助于整体催化位点的显著增加，以及导电性的改善。与SCE相比，在-1.6 V下，合成的纳米复合材料的氨收率为1.67 mmol h-1 cm-2，法拉第效率（FE）为89.64%，在电催化还原硝态氮（NO3−）方面表现出优异的效果。此外，RuP2-MnP-NPC/CP纳米复合材料具有显著的耐久性和长时间的稳定性。一项涉及同位素标记程序的研究结果表明，氨的产生是由于硝酸盐的减少。RuP2-MnP-NPC纳米复合材料是处理硝酸盐污染废水高效提取氨的有效电催化剂。针对各种工业用途，该回收氨可以连续使用，强调了纳米复合材料在处理环境污染物方面的适应性和有效性。

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

Electrochimica Acta 工程技术-电化学

CiteScore

11.30

自引率

6.10%

发文量

1634

审稿时长

41 days

期刊介绍： Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.