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22. Heterostructure CoFe@(Co0.5Fe0.5)S@NCNT anchored on rice husk-based hierarchical porous carbon as a bifunctional cathode catalyst for Zn–air batteries

Author

Yang, Jin, primary, Shi, Jun, additional, Wu, Yupeng, additional, Liu, Huimin, additional, Liu, Zhiqiang, additional, You, Qinwen, additional, Li, Xinxin, additional, Cong, Linchuan, additional, Liu, Debo, additional, Liu, Fangbing, additional, Jiang, Yue, additional, Lin, Nan, additional, Zhang, Wenli, additional, and Lin, Haibo, additional

Published
2024
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26. Heterostructure CoFe@(Co0.5Fe0.5)S@NCNT anchored on rice husk-based hierarchical porous carbon as a bifunctional cathode catalyst for Zn–air batteries.

Author

Yang, Jin, Shi, Jun, Wu, Yupeng, Liu, Huimin, Liu, Zhiqiang, You, Qinwen, Li, Xinxin, Cong, Linchuan, Liu, Debo, Liu, Fangbing, Jiang, Yue, Lin, Nan, Zhang, Wenli, and Lin, Haibo

Abstract

Efficient, low-cost cathode catalysts featuring highly dispersed, active sites are pivotal for advancing metal–air batteries. In this study, a bifunctional catalyst was developed using rice husk-based porous carbon (RHPC) with a hierarchical porous structure, comprising a multilayer heterostructure integrating nanoscale CoFe@(Co0.5Fe0.5)S wrapped with nitrogen-doped carbon nanotubes (NCNTs). XRD and TEM images reveal the formation of a CoFe alloy on the RHPC surface and pores, catalyzing the growth of uniform-diameter NCNTs. XPS analysis demonstrates an electron-donating effect on the surface pyridinic-N structure upon introducing the sulfide intermediate layer. Theoretical simulations substantiate these discoveries, emphasizing diminished adsorption of *OH and *OOH, substantially reducing overpotentials for both the ORR by 21 mV and OER by 46 mV compared to CoFe@NCNT/RHPC lacking the sulfur element. This results in CoFe@(Co0.5Fe0.5)S@NCNT/RHPC emerging as an exceptionally effective bifunctional catalyst (ΔE = 0.614 V). Integration into a rechargeable zinc–air battery showcases a peak power density of 136.0 mW cm−2. The unique morphology design and electronic structure optimization significantly improve the catalytic performance. [ABSTRACT FROM AUTHOR]

Published
2024
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40. Effect of Carbon Support on the Properties of Fe, N, S Co-Doped ORR Catalysts Prepared by Molten Salt Method

Author

Yang, Jin, Wu, Yupeng, Shi, Jun, Liu, Huimin, Liu, Zhiqiang, You, Qinwen, Li, Xinxin, Cong, Linchuan, Liu, Debo, Liu, Fangbing, Jiang, Yue, Lin, Nan, Zhang, Wenli, and Lin, Haibo

Abstract

In recent years, the development of sustainable and environmentally friendly catalysts for various electrochemical processes has become a major focus in the fields of energy storage and fine chemicals. Efficient and cost-effective oxygen reduction reaction (ORR) catalysts are crucial for the advancement of fuel cells and metal-air batteries. This study explores the use of rice husk-based porous carbon (RHPC) with a hierarchically porous structure as a support material for sustainable ORR catalysts. The performance of RHPC was compared with other commercial carbon materials, such as acetylene black (AB) and coconut shell carbon (YP-50), evaluating key properties including particle size, specific surface area, oxygen-containing functional groups, degree of graphitization, and hydrophilicity/hydrophobicity. Compared to AB, which has higher conductivity, and YP-50, which has a greater abundance of oxygen functional groups, RHPC demonstrated significant advantages as a catalyst support. The resulting Fe-NS/RHPC catalyst exhibited high activity (E1/2= 0.858 V vs RHE, J = 4.83 mA cm−2), outperforming the standard Pt/C (E1/2= 0.844 V vs RHE, J = 4.99 mA cm−2). When tested in a liquid Zn-air battery, the Fe-NS/RHPC catalyst achieved a peak power density of 116.2 mW cm−2and a capacity of up to 792.5 mAh g−1.

Published
2024
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42. The effect of creep aging on localized corrosion resistance of AA2060 alloy.

Author

Wang, Xun, Zhan, Lihua, Liu, Chunhui, Ma, Peipei, Li, He, Hu, Libin, Liu, Debo, and Hu, Zhenggen

Subjects
CORROSION resistance, STRESS corrosion, ALLOYS, TENSILE tests, OPTICAL microscopes, CRYSTAL grain boundaries
Abstract

The influence of creep aging at varied stresses on the localized corrosion behavior of AA2060 has been studied in this paper. Samples were subjected to stress free aging (SFA) and creep aging (CA) under two stress levels, after which tensile tests and intergranular corrosion (IGC) tests were carried out. The corrosion morphology and depth were examined using optical microscope. Compared with SFA, CA can enhance the mechanical properties and increase the IGC resistance of Al–Cu–Li alloy but high‐stress CA would intensify the intragranular corrosion penetration in the first 25 hr of aging time. The microstructure observation results show that dislocations introduced by CA provide favorable nucleation sites for T1 precipitates in the grain and impede the growth of T1 precipitates at grain boundary. Therefore, the potential difference between the grain interior and grain boundary can be reduced compared to that for the SFA. The mechanism by which CA affects the corrosion resistance of Al–Cu–Li alloys, as is essential to understand and optimize the creep aging process, has been proposed by considering the effect of creep‐deformation‐induced dislocations. [ABSTRACT FROM AUTHOR]

Published
2020
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