Time-Decoupled Electrolysis via a Rechargeable Metal-Urea Battery for Waste Urea Treatment and Hydrogen Production.

IF 14.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Science Pub Date : 2025-07-17 DOI:10.1002/advs.202507657

Dong Lv, Zhengrong Xu, Xingyu Guo, Deng Liu, Rui Liu

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Abstract

The resource utilization of urea wastewater is an important issue in the environmental field. In the present work, urea can be used as the resource of pure hydrogen production by a temporally decoupled rechargeable metal-urea battery. During the cathodic charging process, urea is dissociated by the reaction of CO(NH₂)₂ + 6OH^-→ N₂ + 5H₂O + CO₂ + 6e^- to achieve the disposal of urea. Water is splitting into hydrogen (2H₂O + 2e^-→ H₂ + 2OH^-) during the cathodic discharging process, accompanied with the production of electrochemical energy. The key catalyst layers at the cathode employed bifunctional Ni/Mo₂C electrocatalysts for both the urea oxidation reaction (UOR) and the hydrogen evolution reaction (HER). The home-made Zn-Urea battery can accomplish continuous hydrogen production with a Faraday efficiency of 99% over 20 h, together with a maximum power density of 3.4 mW cm^-2. The temporally decoupled rechargeable metal-urea battery can convert waste urea into high-value purified hydrogen with partial recovery of electrical energy, offering an impressive resource utilization route for wastewater treatment.

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利用可充电金属-尿素电池进行时间解耦电解，用于废尿素处理和制氢。

尿素废水资源化利用是环境领域的一个重要课题。在本研究中，尿素可以作为纯氢生产的资源，通过一个暂时解耦的可充电金属-尿素电池。在阴极充电过程中，尿素通过CO(NH2)2 + 6OH-→N2 + 5H2O + CO2 + 6e-的反应解离，实现尿素的处置。在阴极放电过程中，水分裂成氢（2H2O + 2e-→H2 + 2OH-），同时产生电化学能。阴极关键催化剂层采用双功能Ni/Mo2C电催化剂，用于尿素氧化反应（UOR）和析氢反应（HER）。自制的锌-尿素电池可以在20小时内实现99%的法拉第效率连续制氢，最大功率密度为3.4 mW cm-2。暂时性解耦的可充电金属-尿素电池可以将废尿素转化为高价值的纯化氢，并部分回收电能，为污水处理提供了一条令人印象深刻的资源化利用途径。

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

Advanced Science CHEMISTRY, MULTIDISCIPLINARYNANOSCIENCE &-NANOSCIENCE & NANOTECHNOLOGY

CiteScore

18.90

自引率

2.60%

发文量

1602

审稿时长

1.9 months

期刊介绍： Advanced Science is a prestigious open access journal that focuses on interdisciplinary research in materials science, physics, chemistry, medical and life sciences, and engineering. The journal aims to promote cutting-edge research by employing a rigorous and impartial review process. It is committed to presenting research articles with the highest quality production standards, ensuring maximum accessibility of top scientific findings. With its vibrant and innovative publication platform, Advanced Science seeks to revolutionize the dissemination and organization of scientific knowledge.