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7. Improvement in the chlorine evolution activity of an SnOx@IrO2–Ta2O5 electrode and its application in the electrolysis of an extremely dilute chlorine-containing solution.

Author

Liu, Lin, Wang, Ming, Zhan, Yiping, Lin, Zhiqian, Xiong, Shenglei, Ye, Hailin, Luo, Yu, Fu, Fenghe, Ren, Zhandong, and Zhu, Yuchan

Subjects
CHLORIDE ions, ELECTRODE efficiency, ELECTRODES, ELECTROLYSIS, CHLORINE, CHARGE exchange
Abstract

It is imperative to solve the problem of the electrolytic efficiency of chlorine evolution in extremely dilute chlorine-containing solutions for electrochemical advanced oxidation processes, electrochemical antifouling and chlorine-containing disinfectant preparation. In this paper, an IrO2–Ta2O5 electrode is modified using SnOx, and the activity and selectivity of the chlorine evolution reaction (CER) are successfully improved. The modification of SnOx changes the electronic structure of IrO2–Ta2O5, thus affecting the electrochemical reaction process and mechanism. Compared with the CER activity of the IrO2–Ta2O5 electrode, the CER activity of the SnOx@IrO2–Ta2O5 electrode is increased, whereas the OER activity is decreased. At a current density of 50 mA cm−2, the potential difference between the CER and OER of the SnOx@IrO2–Ta2O5-3 electrode is 254 mV, which is 89 mV higher than that of the IrO2–Ta2O5 electrode. This proves that the selectivity of the CER at the SnOx@IrO2–Ta2O5 electrode has been improved. Due to the low concentration of chloride ions, the current efficiency of the IrO2–Ta2O5 electrode is only 10.7%. The current efficiency of the SnOx@IrO2–Ta2O5-1(2,3) electrode increases to 23.6%, 36.7% and 49.6%, respectively. For the IrO2–Ta2O5 electrode, its rate-determining step (RDS) is the second electron transfer. However, for the SnOx@IrO2–Ta2O5-3 electrode, its RDS is electrochemical desorption. It can be inferred that the modification of SnOx can accelerate the electrochemical desorption of adsorbed Cl. In addition, the application of the SnOx@IrO2–Ta2O5 electrode in the preparation of AEW is investigated. The HClO content in AEW2 (prepared using the SnOx@IrO2–Ta2O5-3 electrode) is 1.85 mmol L−1, which is 4.6 times of that in AEW1 (prepared using the IrO2–Ta2O5 electrode). [ABSTRACT FROM AUTHOR]

Published
2024
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14. Elastic and Conductive Cross‐linked Anion Exchange Membranes Based on Polyphenylene Oxide and Poly(vinyl alcohol) for H2‐O2 Fuel Cells.

Author

Han, Juanjuan, Zhang, Yangyang, Zheng, Xiumeng, Lu, Yuyang, Li, Wanting, Zhou, Xiaorong, Ren, Zhandong, Liu, Yi, Hu, Meixue, Xiao, Li, and Zhuang, Lin

Subjects
ION-permeable membranes, POLYPHENYLENE oxide, FUEL cells, CHEMICAL stability, IONIC conductivity, POLYMERIZED ionic liquids, GLUTARALDEHYDE, POLYMER networks
Abstract

A series of cross‐linked AEMs (c‐DQPPO/PVA) are synthesized by using rigid polyphenylene oxide and flexible poly(vinyl alcohol) as the backbones. Dual cations are grafted on the PPO backbone to improve the ion exchange capacity (IEC), while glutaraldehyde is introduced to enhance compatibility and reduce swelling ratio of AEMs. In addition to the enhanced mechanical properties resulting from the rigid‐flexible cross‐linked network, c‐DQPPO/PVA AEMs also exhibit impressive ionic conductivity, which can be attributed to their high IEC, good hydrophilicity of PVA, and well‐defined micro‐morphology. Additionally, due to confined dimension behavior and ordered micro‐morphology, c‐DQPPO/PVA AEMs demonstrate excellent chemical stability. Specifically, c‐DQPPO/PVA‐7.5 exhibits a wet‐state tensile strength of 12.5 MPa and an elongation at break of 53.0 % at 25 °C. Its OH− conductivity and swelling degree at 80 °C are measured to be 125.7 mS cm−1 and 8.2 %, respectively, with an IEC of 3.05 mmol g−1. After 30 days in a 1 M NaOH solution at 80 °C, c‐DQPPO/PVA‐7.5 experiences degradation rates of 12.8 % for tensile strength, 27.4 % for elongation at break, 14.7 % for IEC, and 19.2 % for ion conductivity. With its excellent properties, c‐DQPPO/PVA‐7.5 exhibits a peak power density of 0.751 W cm−2 at 60 °C in an H2‐O2 fuel cell. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Overcoming the problem of insolubility to controllably synthesize AuCo alloy as a high performance electrocatalyst for the oxygen reduction reaction.

Author

Ren, Zhandong, Xie, Zhiqiang, Ming, Ruoxi, Zhan, Yiping, Xin, Yuefei, Han, Juanjuan, Zhuang, Lin, Liu, Yi, and Zhu, Yuchan

Subjects
*ALLOYS, *POLAR effects (Chemistry), *MAGNETRON sputtering, *PHASE diagrams, *OXYGEN reduction
Abstract

AuCo alloys were prepared by magnetron sputtering for the first time without considering the insolubility on the phase diagram. The electronic effect between Au and Co can change the oxygen adsorption energy and the ORR activity. The ORR activity of the Au46Co54 alloy electrode not only exceeded that of Au, but also exceeded that of Pt in basic solution. [ABSTRACT FROM AUTHOR]

Published
2023
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42. A nano AuTiO2−x composite with electrochemical characteristics of under-potential deposition of H (H-UPD) as a highly efficient electrocatalyst for hydrogen evolution.

Author

Ren, Zhandong, Jin, Lingzhi, Gao, Jie, Chen, Hanruo, Zhai, Conghui, Tan, Lingjun, Cong, Ning, Fang, Hua, Zhou, Xiaorong, and Zhu, Yuchan

Subjects
*HYDROGEN evolution reactions, *POLAR effects (Chemistry), *HYDROGEN, *BIOLOGICAL evolution, *ELECTRODES
Abstract

An obvious H-UPD for a nano AuTiO2−x composite has been found for the first time in terms of the electrochemical characteristics of the Au composite. The electronic effect between Au and TiO2 and the oxygen vacancy defect would change the adsorption energy of H and HER activity. The HER activity of the AuTiO2−x electrode is 6.44 times that of the Au electrode. [ABSTRACT FROM AUTHOR]

Published
2019
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