富氧空位的超亲水多孔CoOOH纳米结构用于大电流密度尿素电氧化
收稿日期: 2025-03-23
修回日期: 2025-04-30
录用日期: 2025-05-20
网络出版日期: 2025-05-19
Superhydrophilic Porous CoOOH Nano-Architecture with Abundant Oxygen Vacancies for Enhanced Urea Electrooxidation at Ampere-Level Current Densities
Received date: 2025-03-23
Revised date: 2025-04-30
Accepted date: 2025-05-20
Online published: 2025-05-19
含尿素废水的转化制取清洁氢能技术日益受到关注，但尿素氧化反应（UOR）仍面临催化动力学迟缓和长期稳定性不足的挑战。本研究通过电化学重构CoP纳米针前驱体，在碳纤维纸（CFP）上构建了具有亲水表面和丰富氧空位（Ov）的松散多孔CoOOH纳米结构（CoOOH LPNAs）。该三维电极在1000 mA·cm−2电流密度下展现出1.38 V（vs. RHE）的低电位和优异的UOR耐久性。在阴离子交换膜（AEM）电解槽中，工业级尿素辅助水分解仅需1.53 V即可实现1000 mA·cm−2的电流密度，并稳定运行100小时无衰减。实验与理论研究表明，丰富的氧空位能够有效调控CoOOH的电子结构并且产生Co原子相互靠近的独特Co3三角活性位点。这种协同作用精确调控了反应物及中间产物的吸附-脱附过程，显著降低了UOR的热力学能垒。此外，超亲水自支撑纳米阵列结构促进了反应过程中气体气泡的快速脱附，既提升了整体反应效率，又避免了气泡堆积引发的催化剂剥离问题，从而在高电流密度下同时实现了催化活性和稳定性的双重提升。
吕文静 , 唐小鳗 , 王雪彤 , 刘文才 , 朱鉴文 , 王国静 , 朱远蹠 . 富氧空位的超亲水多孔CoOOH纳米结构用于大电流密度尿素电氧化[J]. 电化学, 2025 , 31(8) : 2503231 . DOI: 10.61558/2993-074X.3550
The conversion of urea-containing wastewater into clean hydrogen energy has gained increasing attention. However, challenges remain, particularly with sluggish catalytic kinetics and limited long-term stability of urea oxidation reaction (UOR). Herein, we report the loosely porous CoOOH nano-architecture (CoOOH LPNAs) with hydrophilic surface and abundant oxygen vacancies (Ov) on carbon fiber paper (CFP) by electrochemical reconstruction of the CoP nanoneedles precursor. The resulting three-dimensional electrode exhibited an impressively low potential of 1.38 V at 1000 mA·cm−2 and excellent durability for UOR. Furthermore, when tested in an anion exchange membrane (AEM) electrolyzer, it required only 1.53 V at 1000 mA·cm−2 for industrial urea-assisted water splitting and operated stably for 100 h without degradation. Experimental and theoretical investigations revealed that rich oxygen vacancies effectively modulate the electronic structure of the CoOOH while creating unique Co3-triangle sites with Co atoms close together. As a result, the adsorption and desorption processes of reactants and intermediates in UOR could be finely tuned, thereby significantly reducing thermodynamic barriers. Additionally, the superhydrophilic self-supported nanoarray structure facilitated rapid gas bubble release, improving the overall efficiency of the reaction and preventing potential catalyst detachment caused by bubble accumulation, thereby improving both catalytic activity and stability at high current densities.
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