Facile synthesis MnCo2O4.5@C nanospheres modifying PbO2 energy-saving electrode for zinc electrowinning

Wang, Xuanbing; Wang, Junli; Yu, Bohao; Jiang, Wenhao; Wei, Jinlong; Chen, Buming; Xu, Ruidong; Yang, Linjing

doi:10.1016/j.jhazmat.2021.128212

Cited by 23 publications

(3 citation statements)

References 56 publications

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“…To evaluate the activity of each electrocatalyst, linear sweep voltammetry (LSV) was measured at a scan rate of 5 mV·s −1 , and the linear portion of the Tafel polarization curve was fitted according to the following Tafel Eq. (1): [ 44 ]

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Section: Methodsmentioning

confidence: 99%

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

Feng,

Rao,

et al. 2023

Chin. J. Chem.

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Comprehensive SummarySeawater electrolysis holds great promise for hydrogen production in the future, while the development of anodic catalysts has been severely hampered by the side‐reaction, chloride evolution reaction. In this work, nano‐flower‐cluster structured CoO@FeSe2/CF catalysts are synthesized via a scalable electrodeposition technique, and the performance is systematically studied. The oxygen evolution reaction (OER) overpotential of CoO@FeSe2/CF is 267 mV at 100 mA·cm−2, which is significantly lower than that of the IrO2 catalyst (435 mV). Additionally, the catalyst shows high selectivity for OER (97.9%) and almost no loss of activity after a durability test for 1100 h. The impressive performance is attributed to the dense rod‐like structure with abundant active centers after electrochemical activation and the in‐situ generated CoOOH and FeOOH that improve the catalytic activity of the catalyst. The synergistic effect induced by the non‐uniform structure endows the catalyst with excellent stability.

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…”

Section: Methodsmentioning

confidence: 99%

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

Feng,

Rao,

et al. 2023

Chin. J. Chem.

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“…In order to improve the corrosion resistance of the Pb-(0.5-1 wt%) Ag anode, the Pb-(0.5-1 wt%) Ag alloy anode is subjected to pre-oxidation in a sulfuric acid solution, leading to the creation of a dense and impenetrable PbO 2 layer on its surface. 5 However, significantly increased overpotentials are required in the processed Pb-(0.5-1 wt%) Ag anode to stimulate the oxygen evolution reaction (OER). Therefore, the primary energysaving measures for zinc electrowinning are lowering the overpotential of the OER of anode and the energy required to produce the PbO 2 layer.…”

mentioning

confidence: 99%

Preparation and Electrochemical Properties of the CF-Ti/β-PbO₂ Composite Anode for Zinc Electrowinning

Wang,

Zeng,

Liu

et al. 2024

J. Electrochem. Soc.

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This study focused on creating a unique CF-Ti/β-PbO2 composite anode through the combination of powder metallurgy and electrodeposition techniques. A study was conducted on how carbon fiber affects the properties of the anode in the process of zinc electrowinning. The addition of carbon fiber was discovered to enhance the performance of the electrode. When 3% carbon fiber is added, the cell voltage of the composite anode is reduced by 3.06 V, and the current efficiency is increased by 10.16% to 96.39%. Compared to the composite anode without carbon fiber, the corrosion rate of the composite anode containing carbon fiber is decreased by 67.35%. Moreover, the energy usage is reduced by 50%, leading to a potential conservation of 3313.87 kW·h per ton.

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“…The Xu group first reported the application of Mn-Co bimetallic oxide in the zinc electrowinning process. 18,19 MnCo 2 O 4.5 and MnCo 2 O 4.5 @C catalyst powders were synthesized via chemical precipitation and pyrolysis, respectively. Afterward, Pb-Ag/α-PbO 2 / β-PbO 2 -MnCo 2 O 4.5 and Pb-Ag/α-PbO 2 /β-PbO 2 -MnCo 2 O 4.5 @C composite anodes were prepared by embedding MnCo 2 O 4.5 or MnCo 2 O 4.5 @C into the coating through electrodeposition.…”

mentioning

confidence: 99%

Incorporating an Efficient Oxygen Evolution Catalyst of MnCo₂O_4.5 into a Pb Matrix as an Energy-Saving Anode for Metal Electrowinning

Zhong,

Ren,

Jiang

et al. 2023

J. Electrochem. Soc.

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Based on the outstanding catalytic activity and stability of Mn-Co bimetallic oxides toward oxygen evolution in acidic solutions, MnCo2O4.5 was incorporated into a Pb matrix through a powder pressing-sintering process to obtain a Pb-MnCo2O4.5 composite anode. Compared with the Pb anode that was made via the powder pressing-sintering process (PS-Pb), the oxide layer formed on the Pb-MnCo2O4.5 anode presented a higher flatness, compactness, and β-PbO2 concentration. Consequently, Pb-5.0MnCo2O4.5 presented a stable anodic potential of 1.235 V, approximately 170 mV lower than that of the PS-Pb anode. In the case of lower MnCo2O4.5 content (≤ 2.5%), the Pb-MnCo2O4.5 composite anode exhibited a smaller Tafel slope (70.39 ~ 79.59 mV dec−1) and a lower charge transfer resistance (0.437 ~ 0.676 Ω cm2). The fresh Pb-5.0MnCo2O4.5 composite anode showed a self-corrosion density of 0.25 mA cm−2, approximately 14.3% of that tested on the PS-Pb anode. However, Co2+ and Mn2+ were detected in the electrolyte during 72 h of electrowinning with the Pb-MnCo2O4.5 composite anode. In summary, the Pb-MnCo2O4.5 composite anode has the potential to reduce the energy consumption of the metal-electrowinning process. Nonetheless, it is necessary to evaluate the influence of dissolved Co2+ and Mn2+ on the cathodic process before commercial application

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Facile synthesis MnCo2O4.5@C nanospheres modifying PbO2 energy-saving electrode for zinc electrowinning

Cited by 23 publications

References 56 publications

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

Preparation and Electrochemical Properties of the CF-Ti/β-PbO₂ Composite Anode for Zinc Electrowinning

Incorporating an Efficient Oxygen Evolution Catalyst of MnCo₂O_4.5 into a Pb Matrix as an Energy-Saving Anode for Metal Electrowinning

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Facile synthesis MnCo2O4.5@C nanospheres modifying PbO2 energy-saving electrode for zinc electrowinning

Cited by 23 publications

References 56 publications

In‐situ Generation of Hydroxyl Layers in CoO@FeSe2 Catalyst for High Selectivity Seawater Electrolysis

In‐situ Generation of Hydroxyl Layers in CoO@FeSe2 Catalyst for High Selectivity Seawater Electrolysis

Preparation and Electrochemical Properties of the CF-Ti/β-PbO2 Composite Anode for Zinc Electrowinning

Incorporating an Efficient Oxygen Evolution Catalyst of MnCo2O4.5 into a Pb Matrix as an Energy-Saving Anode for Metal Electrowinning

Contact Info

Product

Resources

About

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

In‐situ Generation of Hydroxyl Layers in CoO@FeSe₂ Catalyst for High Selectivity Seawater Electrolysis

Preparation and Electrochemical Properties of the CF-Ti/β-PbO₂ Composite Anode for Zinc Electrowinning

Incorporating an Efficient Oxygen Evolution Catalyst of MnCo₂O_4.5 into a Pb Matrix as an Energy-Saving Anode for Metal Electrowinning