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32. Recent development of non‐iridium‐based electrocatalysts for acidic oxygen evolution reaction.

Author

Shi, Lei, Zhang, Wenhui, Li, Jiayu, Yan, Qing, Chen, Zhengfei, Zhou, Xianbo, Li, Jihong, Gao, Ruiqin, Wu, Yuxue, and Li, Guo‐Dong

Subjects
OXYGEN evolution reactions, IRIDIUM, CATALYSTS, PROTONS, ANODES
Abstract

Proton exchange membrane water electrolyser (PEMWE) possesses great significance for the production of high purity of hydrogen. To expedite the anodic oxygen evolution reaction (OER) that involved multiple electron–proton‐coupled process, efficient and stable electrocatalysts are highly desired. Currently, noble‐metal Ir‐based materials are the benchmark anode due to its corrosion‐resistant property and favourable combination of activity/stability. However, the large‐scale deployment of PEMWE is usually constrained due to the use of the scarcest element iridium. In this review, we disclose the current research progress towards the non‐iridium‐based electrocatalysts for OER in acidic media, and then summarize some typical oxides that possesses good catalytic performance. Besides, we also present the unresolved problems and challenges in an attempt to enhance the activity/stability of these catalysts. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Cyclic behavior of RC beams under artificial climate rapid freeze-thaw environment: A further research

Author

Jun-Yan Wang, Xian-Liang Rong, Shan-Suo Zheng, Yi-Xin Zhang, Kuang-Yu Dai, Li-guo Dong, and Zi-Sheng Wang

Subjects
Freeze–thaw damage, RC beam, Artificial climate environment, Seismic behavior, Concrete strength, Calculation formula of skeleton curve, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Frost damage to concrete can make concrete beams more vulnerable under seismic forces. However, research on the seismic performance of frost-damaged reinforced concrete (RC) beams is still in its infancy. In this paper, the effects of freeze–thaw cycles (FTCs) and concrete strength on the seismic performance of frost-damaged RC beams are studied using an artificial rapid freeze–thaw climate and pseudo–static test in sequence. The seismic resistance of frost-damaged RC beams is assessed in the following respects: general damage behavior and failure pattern, hysteresis response, displacement, strength, cumulative energy consumption, and shear component. It turns out that, with the increase in the number of FTCs (NFTCs), the load and displacement under different characteristic states, ductility ratio, and cumulative energy consumption decrease stage by stage, while the shear distortion and the contribution of shear displacement under the entire cyclic loading process are progressively enhanced. Simultaneously, the strength of the cracking point is more susceptible to FTC action than to yield and peak points, and the declining rate of strength under different characteristic points gradually increases. Based on the test results, a calculation formula for the skeleton curve of frost-damaged RC beam–column is established, taking the influences of the pristine concrete strength, NFTCs, and axial force ratio into account.

Published
2022
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