A feasibility study of simultaneous sewage treatment and hydrogen production by electrolyzing water using NiCo2O4/NF anode

doi:10.19965/j.cnki.iwt.2024-0069

Abstract

Abstract:

NiCo₂O₄/NF based on foam nickel(NF) was prepared and used as anode to construct a hydrogen production system coupled with sewage treatment by electrolyzing water through matching commercial platinum plate hydrogen evolution catalyst. The electrochemical performance of NiCo₂O₄/NF anode material was evaluated, and the sewage treatment performance and operation of the system were investigated. The results indicated that NiCo₂O₄/NF synthesized by one-step hydrothermal method had low overpotential and good stability. Applying 3 V to the system and after 96 hours, the removal rates of COD and ammonia-nitrogen reached 44.1% and 18.0%, respectively. The degradation of COD and ammonia-nitrogen showed high correlations with the pseudo-first-order reaction kinetics and had relatively low reaction rate constants under given conditions. The NiCo₂O₄/NF electrocatalyst and its constructed hydrogen production by water electrolysis synchronous sewage treatment system had realized the treatment and purification of sewage, as well as the production of hydrogen.

Key words: water electrolysis, hydrogen production, electrocatalysis, NiCo₂O₄/NF, municipal sewage

摘要：

制备以泡沫镍（NF）为基底的NiCo₂O₄/NF，并以此作为阳极，通过匹配商业化铂片析氢催化剂构建电化学方法处理污水耦合电解水制氢体系，评估NiCo₂O₄/NF阳极材料的电化学性能，考察体系的污水处理能力及运行情况。结果表明，采用一步水热法合成的NiCo₂O₄/NF具有低过电位及较好的稳定性；对体系施加3 V电压进行污水处理，96 h后COD和氨氮去除率分别达到44.1%和18.0%，并且降解COD和去除氨氮的反应与准一级反应动力学具有较高的相关性，在给定条件下具有相对较低的反应速率常数。NiCo₂O₄/NF阳极及其构建的电解水制氢同步污水处理体系实现了对污水的处理和净化，同时实现了氢气的制备。

关键词: 电解水, 制氢, 电催化, NiCo₂O₄/NF, 市政污水

CLC Number:

Wei HOU, Xiao ZHANG, Bowei ZHAO. A feasibility study of simultaneous sewage treatment and hydrogen production by electrolyzing water using NiCo₂O₄/NF anode[J]. Industrial Water Treatment, 2025, 45(2): 71-77.

侯炜, 张潇, 赵博玮. 基于NiCo₂O₄/NF阳极的电解水制氢同步污水处理可行性研究[J]. 工业水处理, 2025, 45(2): 71-77.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2024-0069

https://www.iwt.cn/EN/Y2025/V45/I2/71

Figures/Tables 10

Fig.1 Schematic diagram of the designed continuous flow electrochemical reactor

Fig.2 XRD patterns of NiCo₂O₄/NF before and after reaction

Fig.3 SEM images of NiCo₂O₄/NF before（a-c） and after（d-f） reaction

Fig.4 N₂ adsorption-desorption isotherm（a）and pore size distribution（b）of NiCo₂O₄/NF

Fig.5 XPS of NiCo₂O₄/NF electrode

Fig.6 Linear scan polarization curves（a）of NiCo₂O₄/NF，iridium-tantalum-titanium and NF， and tafel diagrams（b）of NiCo₂O₄/NF and iridium-tantalum-titanium before reaction

Fig.7 Linear scan polarization curves（a）and tafel diagrams（b）of NiCo₂O₄/NF before and after reaction

Fig.8 The concentration changes of COD（a），ammonia-

Fig.9 Experimental mechanism diagram

Fig.10 The fitting curves of reaction kinetics for the removal of COD （a） and ammonia-nitrogen （b） in the system

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A feasibility study of simultaneous sewage treatment and hydrogen production by electrolyzing water using NiCo₂O₄/NF anode

基于NiCo₂O₄/NF阳极的电解水制氢同步污水处理可行性研究

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