Preparation and characterization of Fe-Ce co-doped Ti/TiO2 NTs/PbO2 nanocomposite electrodes for efficient electrocatalytic degradation of organic pollutants

Xu, Maotian; Mao, Yulu; Song, Wenliang; Ouyang, Xuemei; Hu, Yunhu; Wei, Yijun; Zhu, Chen; Fang, Wenyan; Shao, Bingchao; Lu, Rong Rong; Wang, Fengwu

doi:10.1016/j.jelechem.2018.06.007

Cited by 81 publications

(13 citation statements)

References 59 publications

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“…Further analysis revealed that the presence of Ce in a mixed valence of +4 and +3 valence, suggesting that CeCl 3 ·7H 2 O undergoes thermal oxidation treatment to form CeO 2 and Ce 2 O 3 . [ 20 ] The Ru 3p peaks in Figure 2e at 458.6 and 483.4 eV can be attributed to the metal Ru (0), whereas those at 462.6 and 485.8 eV are attributed to Ru (+4). The high calculated surface percentage (86.9%) of Ru (+4) in the Ru XPS spectra suggested that RuCl 3 is mostly oxidized to RuO 2 .…”

Section: Resultsmentioning

confidence: 99%

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Xue,

Zhao,

et al. 2023

Adv Funct Materials

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The concomitant degradation of organic contaminants using green oxidants, NaClO and O3, exhibits great potential to mitigate the deleterious impact of organic pollutants. In this work, the electrochemical ozone production (EOP) and chlorine evolution reaction (CER) performed by highly active electrocatalysts composed of Ce‐Ni‐Sb‐SnO2 and Ru‐Ir‐Ce‐Ni‐Sb‐SnO2, respectively, are presented. Ce‐Ni‐Sb‐SnO2 exhibits high selectivity with a 43.9% Faraday efficiency in EOP. Incorporating Ru and Ir in Ru‐Ir‐Ce‐Ni‐Sb‐SnO2 improves CER performance, achieving outstanding Faraday efficiency of up to 98.3%. Additionally, it achieves a low overpotential of ≈80 mV at 10 mA cm−2 with 0.3 m NaCl (pH = 6). Theoretical calculations reveal the significant impact of multicomponent oxides on reaction intermediate adsorption. Ce, Ni, Sb doping on SnO2 enhances O2 and O3 adsorption for optimal EOP performance, while Ru and Ir doping on Ce‐Ni‐Sb‐SnO2 enhances Cl adsorption, boosting CER performance. Further investigations into the decomposition of pesticides and antibiotics demonstrate that the collaborative impact of O3 and NaClO elicits a significantly more robust kinetic degradation rate in comparison to their individual influences. This work aims to shed light on the synthesis of multicomponent metal oxides as potential precursors for the cost‐effective preparation of O3 and NaClO for electrochemical advanced oxidation processes.

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Section: Resultsmentioning

confidence: 99%

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Xue,

Zhao,

et al. 2023

Adv Funct Materials

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“…Firstly, as shown in Fig 6A , the TC removal achieved the largest level higher than 97% with the pH of 5.0, whereas the further decrease in pH lowered the TC removal to 74.7% ± 4.1%. The decrease may be attributed to the reason that TC has positive charge and electrically repulsed with the positive electrode, which was detrimental for pollutants to be adsorbed on the active sites on electrode [ 46 ] and then deteriorated TC removal. As the pH increased to 8, it would boost the consumption of electrolyte and lowered the conductivity of solution [ 46 ], thereby decreasing the TC removal (58.8% ± 2.2%).…”

Section: Resultsmentioning

confidence: 99%

“…The decrease may be attributed to the reason that TC has positive charge and electrically repulsed with the positive electrode, which was detrimental for pollutants to be adsorbed on the active sites on electrode [ 46 ] and then deteriorated TC removal. As the pH increased to 8, it would boost the consumption of electrolyte and lowered the conductivity of solution [ 46 ], thereby decreasing the TC removal (58.8% ± 2.2%). The result was consistent with the reported results from Tang et al [ 47 ].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Graphite-UiO-66(Zr)/Ti electrode for efficient electrochemical oxidation of tetracycline in water

et al. 2022

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Tetracycline (TC) is widely-used antibiotic pollutant with high toxicity, refractory, persistence and bacteriostasis, and its removal from water needs to be enhanced. In this work, a novel Graphite-UiO-66(Zr)/Ti electrode was successfully prepared and evaluated for electrochemical oxidation degradation of TC. The electrochemical performance tests indicate the Graphite-UiO-66(Zr)/Ti electrode had higher electrochemical oxidation activity, which achieved higher TC removal efficiency (98.1% ± 1.5%) than Ti plate (65.2% ± 3.5%), Graphite-MIL-53(Al)/Ti electrode (79.5% ± 2.9%) and Graphite-MIL-100(Fe)/Ti electrode (89.0% ± 2.6%). The influence of operating condition was also systematically studied, and the optimized condition was pH 5.0, 20 mA/cm2 current density and 0.1 M electrolyte (Na2SO4). Through the liquid chromatography mass spectrometry (LC-MS), the TC degradation pathway by Graphite-UiO-66(Zr)/Ti electrode oxidation was proposed. Under the •OH free radical oxidative decomposition effect, the double bond, phenolic group and amine group of TC were attacked. TC was transformed into intermediate product ① (m/z = 447), then was further degraded to intermediates ② (m/z = 401) and ③ (m/z = 417). The latter was fragmented into small fractions ④ (m/z = 194), ⑤but-2-enedioic acid (m/z = 116) and ⑥oxalic acid (m/z = 90, the proposed intermediate). In addition, TC removal remained at 89.6% ± 2.7% in the sixth cycle of operation, which confirmed the efficient reusability and stability for antibiotics removal from water.

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“…The oxygen evolution reaction (OER) occurs when the current intensity suddenly increases in the linear polarization curve. An additional amount of oxygen evolution potential (OEP) is needed to reduce the side-reaction of oxygen evolution [28]. The OEPs obtained for PbO 2 and neodymium-doped PbO 2 electrodes were 1.72 and 2 V, respectively, indicating significant improvement in neodymium-doped PbO 2 electrocatalytic performance after incorporation of neodymium in the PbO 2 matrix [29,30].…”

Section: Characterizationmentioning

confidence: 99%

Electrosynthesis of perchlorate using neodymium-doped PbO ₂ electrode: application of experimental design methodology for optimization of the effective parameters

Cheraghveisi¹,

Maddah²,

Najafi³

2022

Mater. Res. Express

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Today, electrochemical methods and their applications in human life, combating environmental pollution, synthesis and energy have been taken scientists' attention. Meanwhile, the preparation of various compounds and products using electrochemical methods has received more attention due to various advantages such as ease and low cost. Here, we used an electrochemical method to prepare perchlorate. Perchlorate salts are extensively used in rocket fuel, spacecraft, submarines, airbags, fireworks, and fertilizers. Since the anode potential for perchlorate oxidation is near that for water oxidation, conventional electrodes can't be used in the perchlorate electrosynthesis. The modified PbO2 electrodes by neodymium with a wide potential window can be used for this purpose. We prepared these electrodes and they were first evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD) spectrometer, voltammetry and electrochemical impedance spectrometer (EIS). The results showed that the potential of water oxidation on the modified PbO2 electrodes by neodymium was 2 V. To achieve high production yield in the preparation of perchlorate from chlorate, various parameters including pH, time, and current density were optimized by the Box-Behnken design of the experiment method. The optimal values for this process were obtained at pH = 11, temperature 40C and current density of 0.5 mA/cm2. The results at the optimal condition showed that the perchlorate production yield by modified PbO2 electrodes was 80% in the 300 min. This value was only 60% for the unmodified PbO2 electrode.

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Preparation and characterization of Fe-Ce co-doped Ti/TiO2 NTs/PbO2 nanocomposite electrodes for efficient electrocatalytic degradation of organic pollutants

Cited by 81 publications

References 59 publications

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Preparation of Graphite-UiO-66(Zr)/Ti electrode for efficient electrochemical oxidation of tetracycline in water

Electrosynthesis of perchlorate using neodymium-doped PbO ₂ electrode: application of experimental design methodology for optimization of the effective parameters

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Preparation and characterization of Fe-Ce co-doped Ti/TiO2 NTs/PbO2 nanocomposite electrodes for efficient electrocatalytic degradation of organic pollutants

Cited by 81 publications

References 59 publications

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Facilitating Electrochemical Ozone Production and Chlorine Evolution Reaction by Synergistic Effect of Multicomponent Metal Oxides

Preparation of Graphite-UiO-66(Zr)/Ti electrode for efficient electrochemical oxidation of tetracycline in water

Electrosynthesis of perchlorate using neodymium-doped PbO 2 electrode: application of experimental design methodology for optimization of the effective parameters

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Electrosynthesis of perchlorate using neodymium-doped PbO ₂ electrode: application of experimental design methodology for optimization of the effective parameters