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1. Nanoalloys and catalytic applications

Author

Wang, Shan, primary, Shan, Shiyao, additional, Caracciolo, Dominic, additional, Lu, Aolin, additional, Robinson, Richard, additional, Shang, Guojun, additional, and Zhong, Chuan-Jian, additional

Published
2023
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2. Contributors

Author

Ali, Nasir, primary, Andrijauskas, Fabio, additional, Balakrishna Pillai, P., additional, Banash, Mark, additional, Cao, B., additional, Caracciolo, Dominic, additional, Casimir, Daniel, additional, Chen, J., additional, Ciobanu, Cristian V., additional, Coluci, Vitor R., additional, Dantas, Sócrates O., additional, De Souza, M.M., additional, Farinre, Olasunbo, additional, Garboczi, E.J., additional, Garcia-Sanchez, Raul, additional, Harbola, M.K., additional, Hu, Ming, additional, Ikuhara, Y.H., additional, Ji, Z., additional, Likith, Sri Ranga Jai, additional, Lin, Miao-Ling, additional, Lindsay, L., additional, Lu, Aolin, additional, Mansfield, Elisabeth, additional, Misra, Prabhakar, additional, Mookerjee, A., additional, Myers, J., additional, Pal, Antardipan, additional, Pandey, Ravindra, additional, Pandey, T., additional, Phillips, Lia, additional, Rast, L., additional, Robinson, Richard, additional, Saikia, Nabanita, additional, Shan, Shiyao, additional, Shang, Guojun, additional, Singh, P., additional, Tan, Ping-Heng, additional, Tewary, Vinod K., additional, Vishal, K., additional, Wang, K., additional, Wang, Shan, additional, Wang, Xiaoyu, additional, Wu, Huizhen, additional, Yau, Dennis D., additional, Yu, Shuguo, additional, Yue, Naili, additional, Zhang, Hongyan, additional, Zhang, Yong, additional, Zheng, Zhi, additional, Zhong, Chuan-Jian, additional, Zhou, Weilie, additional, and Zhuang, Y., additional

Published
2023
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9. Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

Author

Xiao, Fei, Wang, Yu-Cheng, Wu, Zhi-Peng, Chen, Guangyu, Yang, Fei, Zhu, Shangqian, Siddharth, Kumar, Kong, Zhijie, Lu, Aolin, Li, Jincheng, Zhong, Chuan-Jian, Zhou, Zhi-You, Shao, Minhua, Xiao, Fei, Wang, Yu-Cheng, Wu, Zhi-Peng, Chen, Guangyu, Yang, Fei, Zhu, Shangqian, Siddharth, Kumar, Kong, Zhijie, Lu, Aolin, Li, Jincheng, Zhong, Chuan-Jian, Zhou, Zhi-You, and Shao, Minhua

Abstract

The rapid progress of proton exchange membrane fuel cells (PEMFCs) and alkaline exchange membrane fuel cells (AMFCs) has boosted the hydrogen economy concept via diverse energy applications in the past decades. For a holistic understanding of the development status of PEMFCs and AMFCs, recent advancements in electrocatalyst design and catalyst layer optimization, along with cell performance in terms of activity and durability in PEMFCs and AMFCs, are summarized here. The activity, stability, and fuel cell performance of different types of electrocatalysts for both oxygen reduction reaction and hydrogen oxidation reaction are discussed and compared. Research directions on the further development of active, stable, and low‐cost electrocatalysts to meet the ultimate commercialization of PEMFCs and AMFCs are also discussed.

Published
2021

10. Recent Advances in Electrocatalysts for Proton Exchange Membrane Fuel Cells and Alkaline Membrane Fuel Cells

Author

Xiao, Fei, primary, Wang, Yu‐Cheng, additional, Wu, Zhi‐Peng, additional, Chen, Guangyu, additional, Yang, Fei, additional, Zhu, Shangqian, additional, Siddharth, Kumar, additional, Kong, Zhijie, additional, Lu, Aolin, additional, Li, Jin‐Cheng, additional, Zhong, Chuan‐Jian, additional, Zhou, Zhi‐You, additional, and Shao, Minhua, additional

Published
2021
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11. Copper-alloy catalysts: structural characterization and catalytic synergies

Author

Zeng, Shanghong, primary, Shan, Shiyao, additional, Lu, Aolin, additional, Wang, Shan, additional, Caracciolo, Dominic T., additional, Robinson, Richard J., additional, Shang, Guojun, additional, Xue, Lei, additional, Zhao, Yuansong, additional, Zhang, Aiai, additional, Liu, Yang, additional, Liu, Shangpeng, additional, Liu, Ze, additional, Bai, Fenghua, additional, Wu, Jinfang, additional, Wang, Hong, additional, and Zhong, Chuan-Jian, additional

Published
2021
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14. From a Au-rich core/PtNi-rich shell to a Ni-rich core/PtAu-rich shell: an effective thermochemical pathway to nanoengineering catalysts for fuel cells

Author

Lu, Aolin, primary, Wu, Zhi-Peng, additional, Chen, Binghui, additional, Peng, Dong-Liang, additional, Yan, Shan, additional, Shan, Shiyao, additional, Skeete, Zakiya, additional, Chang, Fangfang, additional, Chen, Yuanzhi, additional, Zheng, Hongfei, additional, Zeng, Deqian, additional, Yang, Lefu, additional, Sharma, Anju, additional, Luo, Jin, additional, Wang, Lichang, additional, Petkov, Valeri, additional, and Zhong, Chuan-Jian, additional

Published
2018
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20. Nanoalloy catalysts inside fuel cells: An atomic-level perspective on the functionality by combined in operandox-ray spectroscopy and total scattering

Author

Petkov, Valeri, Maswadeh, Yazan, Zhao, Yinguang, Lu, Aolin, Cronk, Hannah, Chang, Fangfang, Shan, Shiyao, Kareem, Haval, Luo, Jin, Zhong, Chuan-Jian, Shastri, Sarvjit, and Kenesei, Peter

Abstract

We introduce an experimental approach for structural characterization of catalysts for fuel cells combining synchrotron x-ray spectroscopy and total scattering. The approach allows probing catalysts inside operating fuel cells with atomic-level precision (~ 0.02 Å) and element specificity (~ 2–3 at%) in both time (~ 1 min) and space (~ µm) resolved manner. The approach is demonstrated on exemplary Pd-Sn and Pt-Ni-Cu nanoalloy catalysts for the oxygen reduction reaction (ORR) deposited on the cathode of an operating proton exchange membrane fuel cell. In operandox-ray data show that under operating conditions, the catalyst particles can undergo specific structural changes, ranging from sub-Å atomic fluctuations and sharp nanophase transitions to a gradual strain relaxation and growth, which inflict significant losses in their ORR activity. Though triggered electrochemically, the changes are not driven solely by differences in the reduction potential and surface energy of the metallic species constituting the nanoalloys but also by the formation energy of competing nanophases, mismatch between the size of individual atomic species and their ability to interdiffuse fast in search of energetically favorable configurations. Given their complexity, the changes are difficult to predict and so the resulting ORR losses remain difficult to limit. We show that in operandoknowledge of the structural evolution of nanoalloy catalysts helps create strategies for improving their activity and stability. In particular, we show that shaping Pd-Sn nanoalloys rich in Pd as cubes reduces the interdiffusion of atoms at their surface and so makes them better catalysts for ORR in fuel cells in comparison to other Pd-Sn nanoalloys. In addition, we demonstrate that the approach introduced here can provide knowledge of other major factors affecting the performance of fuel cells such as operating temperature and the overall catalyst utilization, in particular the evolution of elemental and mass distribution of catalyst particles over the cells’ cathode. Last but not least, we discuss how in operandox-ray spectroscopy and total x-ray scattering can bridge the knowledge gap between the widely used in situSAXS, EXAFS and monocrystal surface XRD techniques for structural characterization of nanoalloy catalysts explored for energy related applications.

Published
2018
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27. Shape-related optical and catalytic properties of wurtzite-type CoO nanoplates and nanorods.

Author

Lu, Aolin, Chen, Yuanzhi, Zeng, Deqian, Li, Meng, Xie, Qingshui, Zhang, Xiangxin, and Peng, Dong-Liang

Subjects
*COBALT oxides, *NANOROD synthesis, *BOROHYDRIDE, *RENEWABLE energy sources, *BAND gaps, *NANOCRYSTALS
Abstract

In this paper, we report the anisotropic optical and catalytic properties of wurtzite-type hexagonal CoO (h-CoO) nanocrystals, an unusual nanosized indirect semiconductor material. h-CoO nanoplates and nanorods with a divided morphology have been synthesized via facile solution methods. The employment of flash-heating and surfactant tri-n-octylphosphine favors the formation of plate-like morphology, whereas the utilization of cobalt stearate as a precursor is critical for the synthesis of nanorods. Structural analyses indicate that the basal plane of the nanoplates is (001) face and the growth direction of the nanorods is along the c axis. Moreover, the UV–vis absorption spectra, the corresponding energy gap and the catalytic properties are found to vary with the crystal shape and the dimensions of the as-prepared h-CoO nanocrystals. Furthermore, remarkable catalytic activities for H2 generation from the hydrolysis of alkaline NaBH4 solutions have been observed for the as-prepared h-CoO nanocrystals. The calculated Arrhenius activation energies show a decreasing trend with increasing extension degree along the 〈001〉 direction, which is in agreement with the variation of the charge-transfer energy gap. Finally the maximum hydrogen generation rate of the h-CoO nanoplates exceeds most of the reported values of transition metal or noble metal containing catalysts performing in the same reaction system, which makes them a low-cost alternative to commonly used noble metal catalysts in H2 generation from the hydrolysis of borohydrides, and might find potential applications in the field of green energy. [ABSTRACT FROM AUTHOR]

Published
2014
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28. Facile Preparation of Well-Dispersed CeO2–ZnO Composite Hollow Microspheres with Enhanced Catalytic Activity for CO Oxidation

Author

Xie, Qingshui, Zhao, Yue, Guo, Huizhang, Lu, Aolin, Zhang, Xiangxin, Wang, Laisen, Chen, Ming-Shu, and Peng, Dong-Liang

Abstract

In this article, well-dispersed CeO2–ZnO composite hollow microspheres have been fabricated through a simple chemical reaction followed by annealing treatment. Amorphous zinc–cerium citrate hollow microspheres were first synthesized by dispersing zinc citrate hollow microspheres into cerium nitrate solution and then aging at room temperature for 1 h. By calcining the as-produced zinc–cerium citrate hollow microspheres at 500 °C for 2 h, CeO2–ZnO composite hollow microspheres with homogeneous composition distribution could be harvested for the first time. The resulting CeO2–ZnO composite hollow microspheres exhibit enhanced activity for CO oxidation compared with CeO2and ZnO, which is due to well-dispersed small CeO2particles on the surface of ZnO hollow microspheres and strong interaction between CeO2and ZnO. Moreover, when Au nanoparticles are deposited on the surface of the CeO2–ZnO composite hollow microspheres, the full CO conversion temperature of the as-produced 1.0 wt % Au–CeO2–ZnO composites reduces from 300 to 60 °C in comparison with CeO2–ZnO composites. The significantly improved catalytic activity may be ascribed to the strong synergistic interplay between Au nanoparticles and CeO2–ZnO composites.

Published
2014
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