Journal of Water Process Engineering
·
2025
·
IF 6.7
Min Zhang,Shuhuan Yin,Jia Wen,Bin Zheng,Shaohua Lin,Haixia Wu
With the increasing severity of microplastic (MPs) pollution in aquatic environments, the process of removing MPs from water environments by electrocoagulation (EC) technology has attracted widespread attention. In this study, EC using a dimensionally stable anode (DSA)-coated Ti electrode (RuO₂-IrO₂/Ti) under pulsed current was employed to treat wastewater containing polystyrene (PS) MPs. The effects of factors such as electrolyte concentration, initial solution pH, current density, pulse frequency, and pulse duty cycle on the PS removal efficiency were investigated. The results showed that the maximum PS removal of 94.2 % was achieved with an energy consumption of 5.5 kWh/g. The removal mechanism of PS was elucidated through analyses including scanning electron microscopy-energy dispersive spectroscopy, X-ray photoelectron spectroscopy of electrode, X-ray diffraction, fourier transform infrared, and zeta potential measurement of the flocs. Finally, the article conducts an economic analysis of this technology and provides an outlook on its application prospects. This study confirms that the EC technology using RuO₂-IrO₂/Ti can remove MPs from wastewater effectively, which may provide new insights for the development of MPs removal technologies.
研究领域:
环境科学
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水处理技术
·
电化学工程
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环境功能材料
·
污染控制化学
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DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 17
·期 11
·221121
·
IF 1.5
Hao Li,Yiqi Du,Xiaolan Shen,Xinmou Kuang,Jiayi Zhu,Hairong Wang
The comparative electrochemical oxidation efficiency of bisphenol A (BPA) was explored using boron doped diamond (BDD), PbO 2 , and IrO 2 anodes. Several parameters were optimized using the BDD anode. The optimal conditions were a current density of 60 mA·cm −2 , Na 2 SO 4 concentration of 4 g·L −1 , agitation rate of 600 rpm, and BPA concentration of 50 mg·L −1 . The BPA removal efficiencies for the BDD, PbO 2 , and IrO 2 anodes were 100%, 79.9%, and 19.5%, respectively; only the BDD anode showed complete BPA removal. Similarly, the COD removal efficiencies with the BDD, PbO 2 , and IrO 2 anodes were 81.8%, 37.0%, and 6.73%, respectively. Oxidation with the BDD anode was realized mainly by •OH, accounting for approximately 85.6%. In addition, SO 4 · – oxidation and direct oxidation accounted for approximately 7.7% and 6.7%, respectively. In the PbO 2 anode, •OH oxidation, SO4· – oxidation, and direct oxidation accounted for approximately 51.0%, 8.2%, and 40.8%, respectively. In the IrO 2 anode, oxidation was dependent mainly on direct oxidation, and no •OH and SO 4 · – were generated.
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DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Wenxiang Zhu,Qintao Sun,Mengjie Ma,Fan Liao,Qi Shao,Hui Huang,Kun Feng,Dongdong Gao,Jinxin Chen,Hao Yang,Peiping Yu,Jun Zhong,Tao Cheng,Mingwang Shao,Yang Liu,Zhenhui Kang
Iridium (Ir) - based electrocatalysts, as the benchmark electrocatalysts for oxygen evolution reaction (OER), still suffer from sluggish kinetics and substantial overpotential. Here we show the fabrication of heterophase IrO 2 catalysts with homogeneous distribution of rutile phase on 1 T phase (referred to as m-IrO 2 ) by a simple air-annealing method. In acidic condition, the m-IrO 2 catalyst exhibits high activity with a low overpotential of 170 mV at 10 mA cm −2 and good stability with no sign of deactivation over a prolonged 508-h continuous operation, making it one of the best-performing acid-stable OER catalysts. In this system, H 2 O first forms OH* and O* on the rutile phase, and then the interfacial oxygen migrates from the rutile phase to the 1 T phase. Subsequently, O* drives the OER reaction on the 1 T phase, resulting in the generation of OOH* and eventually the formation of O 2 . The interfacial oxygen migration within the heterophase structure of m-IrO 2 boosts the acidic water oxidation activity significantly. These findings provide a promising design strategy for creating high-activity catalysts suitable for acidic conditions through the manipulation of interfaces.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 2
·1-9
·
IF 6.232
Sun Huiyuan,Liu Xueliang,Wang Xinhuan,Han Qiusen,Qi Cui,Li Yanmei,Wang Chen,Chen Yongxiang,Yang Rong
The authors describe a peroxidase-mimicking nanozyme composed of IrO 2 and graphene oxide (GO). It was synthesized from monodisperse IrO 2 nanoparticles with an average diameter of 1.7 ± 0.3 nm that were prepared by pulsed laser ablation in ethanol. The nanoparticles were then placed on polyallylamine-modified GO nanosheets through electrostatic interaction. The peroxidase-like activity of the resulting nanocomposites was evaluated by catalytic oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H 2 O 2 . Kinetic results demonstrated that the catalytic behavior of the nanocomposites follows Michaelis-Menten kinetics. Experiments performed with terephthalic acid and cytochrome C confirmed that the peroxidase-like activity originated from the electron transfer mechanism rather than from generation of hydroxy radicals. The peroxidase-like activity is inhibited in the presence of ascorbic acid (AA). Based on this property, a colorimetric assay was developed for the determination of AA by exploiting the peroxidase-like activity of IrO 2 /GO nanocomposites. The linear relationship between absorbance at 652 nm and the concentration of AA was acquired. The limit of detection for AA is 324 nM. Further applications of the method for AA detection in real samples were also successfully demonstrated.
Schematic of the preparation of polyallylamine (PAH)-stabilized IrO 2 /GO nanocomposites and the colorimetric detection of AA based on the peroxidase-like activity of IrO 2 /GO nanocomposites.
研究领域:
分析化学
·
纳米技术
·
生物化学
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产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Ran Zhang,Jing Cao,Ting Peng,KeXuan Wu,Yinqiang Shu
Dimensional stability anodes (DSA), constructed using noble metal oxides like RuO 2 and IrO 2 , is widely used in industrial chlorine production. The DSA electrode demonstrates exceptional chlorine evolution capabilities in acidic solutions and high-chloride concentrations. However, under neutral conditions, its chlorine evolution efficiency diminishes significantly. In this paper, a low-cost, high-efficiency 3D flower-like NiCo 2 O 4 catalyst was fabricated that exhibits high catalytic activity in neutral sodium chloride solutions. The 3D flower-like NiCo 2 O 4 catalyst exhibits good chlorine evolution efficiency, achieving 90 % at 30 mA/cm 2 in NaCl solutions. Furthermore, it's chlorine evolution efficiency of the electrocatalyst surpasses that of commercial DSA electrode at various current densities, making it a highly promising candidate for electrocatalytic applications.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.6
Zhiming Li,Wei Li,Ning Li,Bo Wu,Yueping Xiong,Qing Cheng,Qi zhao,Jinhui Wu,Deyu Li
In copper electroplating systems, the mechanisms by which organic additives shorten the service life of dimensional stable anodes (DSAs) remain unclear, hindering rational anode and additive design. Here, we investigated the effects of three representative additives—brightener (SPS), suppressor (PEG), and leveler (Collagen)—on IrO₂–Ta₂O₅ DSAs using accelerated lifetime tests, XPS, and DFT calculations. The experimental results showed that all additives reduced electrode durability, with collagen showing the most pronounced effect, shortening lifetime by over 40%. Adsorption of additives increased OER overpotential and accelerated Ir dissolution, leading to decreased electrochemically active surface area and activity. DFT and XPS revealed that collagen and similar N-containing levelers strongly adsorb on IrO₂(110), consistent with their high degradation effect, whereas SPS had minimal impact. Similar adsorption trends were observed on RuO₂(110) and SnO₂(110), suggesting broader relevance. These results clarify additive-induced degradation mechanisms and provide guidance for mitigating durability loss, including optimizing additive concentration and improving oxide coating design.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liming Zeng,Yongyang Zhu,Daifeng Wu,Huayue Cheng,Qing Zhou
To improve the limited kinetics of alkaline hydrogen evolution reaction (HER), herein, a three-dimensional porous catalyst has been constructed based on the design concept of bi-directional electron modulation and chemical environment regulation of non-metallic and oxophilic transition metal elements with obvious differences in electronegativity on hybrid carbon layer-coated iridium/iridium oxide heterostructure. The Ir/IrO 2 @(N,S)-C possesses significantly superior catalytic activity and electrochemical stability towards alkaline HER with an overpotential of 150 mV reaching 50 mA cm −2 from LSV curve and an increment of 63 mV after 200 h of degradation test at 10 mA cm −2 in 1 M KOH, much lower than 277 mV and an elevation of 116 mV just after 25 h in 0.5 M H 2 SO 4 . The strongly electronegative non-metallic elements effectively modulate the electronic states of iridium/iridium oxide, the ratio of metallic states, and the oxophilic environment of the carbon layer, which enables the catalyst surface favorable for the moderate adsorption of water molecules and intermediates. The material engineering strategy offers a new insight for the development of high-performance catalysts towards water electrolysis based on homologous active species.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Muhammad Tariq,Waqas Qamar Zaman,Wei Sun,Zhenhua Zhou,Yiyi Wu,Li-mei Cao,Ji Yang
Minimization of noble metal contents along with enhancement in electrochemical properties with high durability is a major challenge to be overcome for commercializing water electrolyzers and cheap energy storage devices. Sluggish kinetics of the oxygen evolution reaction (OER) within the electrolytic cell and high energy demand to form O═O bonds have attracted more responsiveness to this area. We report the OER beneficial mixed oxide composite of molybdenum and iridium oxides by a facile hydrothermal method. Adhered IrO2 nanoparticles on MoO3 large particles synergistically possessed a robust nature toward harsh acidic water electrolysis as compared to an alkaline environment. Mass specific OER activity of iridium active centers was greatly enhanced by 7-fold, twice the current density, and was attributed to electronic modulation of noble metal. Enhanced surface area and the existence of highly oxidative species in the O(1s) spectrum of IrO2 and two doublet regions in the X-ray photoelectron spectrum of molybdenum metal were found, accountable for the robust performance. Prepared composite possessing only 30% molar fraction of noble metal presented an excellent long-term stability for 40 000 s. Reduction in the Tafel slope from 57 to 77 mV dec–1 for IM-30 and IrO2 respectively was observed. The conducted research will open up new avenues for more applications of molybdenum oxides and their derivatives for water splitting.
研究领域:
材料科学
·
电化学
·
能源存储与转换
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Aiyuan Li,Jiaqi Weng,Xinmei Yan,Hao Li,Haibo Shi,Xuedong Wu
This study compares the electrochemical oxidation of acid orange 74 (AO 74), a typical metal complex azo dye, on four anode materials (Ru, IrO 2 , PbO 2 , and boron doped diamond (BDD)). The results show that the BDD electrode was quite efficient in the anodic oxidation of AO 74 with a 100% removal of AO 74 and an 84.3% removal of COD. Analyzing the active species at different electrodes, we reported that oxidation on an inert electrode primarily depends on direct oxidation and indirect oxidation of active radicals ( OH and O 2 − for the BDD anode and OH for the PbO 2 anode), whereas active electrodes (Ru and IrO 2 ) primarily depend on direct oxidation. The UV–vis spectrum demonstrated that Cr 3+ could be oxidized only on the BDD anode, proving that the BDD electrode has the highest oxidation potential. Similar organic intermediates species were observed on different electrodes by GC–MS. Furthermore, the different organic products are attributed to the difference in the oxidation ability of the electrodes. From the UV–vis spectrum and GC–MS analysis, we speculate that AO 74 was first degraded to aromatic compounds and pyrazole because of the cleavage of the azo-bond. Then it formed amides and organic acid because of the cleavage of the benzene ring, and finally CO 2 and H 2 O were formed.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zuobo Yang,Xiaokuan Wu,Leilei Cai,Yaqi Cao,Zandong Zhang,Xin Teng,Chaoyang Li,Jiayi Wang,Jimmi Yun,Jie Zhang,Xin Liang,Hong Zhao
This study focuses on the development of high-performance and durable supported iridium-based catalysts. Mesoporous antimony tin oxide (ATO) supports with high conductivity, high specific surface area, and rich in oxygen vacancies is prepared by employing a Pt-catalyzed oxidation of carbon template removal approach. The pore sizes of mesoporous ATO supports are tuned from 5 to 12 nm by adjusting the template removal temperature. These supports, used for IrO 2 substrates, improved ultrahigh OER performance, both catalytic activity and mass transfer, demonstrated excellent Proton exchange membrane water electrolysis (PEMWE) performance with a 0.3 mg cm −2 of Ir loading, with a polarization performance of 1.75V@2A cm −2 . Simultaneously, the ATO-supported catalysts demonstrated outstanding performance even at ultra-low loadings owning to the ATO mesoporous structure and surface oxygen-vacancy, achieving 1.8V@2A cm −2 with an Ir loading of 0.05 mg cm −2 . Density functional theory (DFT) computations revealed the strong oxide-support interaction (SOSI) between the IrO 2 and ATO. This research not only validates the effective role of conductive ATO in supported iridium-based catalysts but also provides valuable guidance on the influence of support pore structure to the supported iridium-based catalysts. It offers a new perspective for the development of supported low-iridium OER catalysts.
研究领域:
电化学
·
催化
·
材料科学
·
纳米技术
·
能量转换
·
表面科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Qiaolin Ren,Wei Zhang,Wenjun Yan,Zhongde Wang
Electrochemical oxidation (ECO) technology has proven to be efficient for organic wastewater treatment. Given the strong demand for the development of anodes with superior stability, high activity, and low cost that can be applied industrially, herein, a stable Sb-doped Ti/RuO 2 -IrO 2 -SnO 2 electrode (SSE) is fabricated and served as an anode for the degradation of aniline using diverse power supply modes. The SSE shows better performance than the Ti/RuO 2 -IrO 2 -SnO 2 electrode (SE) in facilitating electron transport, enlarging the electrochemical active surface area, enhancing stability, and increasing electrocatalytic activity. Theoretical calculations reveal the stability and electronic properties of the synthesized electrodes. Furthermore, by degrading complex molecules and real wastewater, the practical industrial application of SSE is explored. Subsequently, the active species and possible degradation pathways are systematically elucidated. Therefore, this work provides a promising and superior-performance electrode with attractive application prospects for the high-efficient degradation of refractory organic wastewater.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Junfei Chen,Xuyu Wang,Liling Zhang,Zebao Rui
Skillful arrangement of the active sites with stable dispersion and desired chemical states on the support surface is vital for their powerful application in catalysis, but remains a daunting challenge. Herein, we present a unique redispersion strategy for well dispersing and stabilizing IrO 2 /Ir active sites over TiO 2 as an advanced catalyst for low temperature CH 4 oxidation. The as-designed Ir/TiO 2 with a 1 wt.% Ir loading amount exhibits a (>)99 % CH 4 conversion and excellent durability at a temperature as low as 320 °C, which ranges among the best of state-of-the-art methane combustion catalysts. Various characterizations and DFT calculations were performed to reveal the redispersion mechanism and understand the reason for the enhanced performance. The superior performance is related to the proper chemical state of complex IrO 2 /Ir active sites and their ultrafine and stable dispersion, all relating to the strong metal-support interaction (SMSI) induced redispersion process. Such SMSI assisted active sites redispersion strategy provides useful guidance for the rational design of efficient Ir-based and other noble metal catalysts.
研究领域:
催化化学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）