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Zou T, Wang Y, Xu F. Defect-Engineered Charge Transfer in a PtCu/Pr xCe 1-xO 2 Carbon-Free Catalyst for Promoting the Methanol Oxidation and Oxygen Reduction Reactions. ACS APPLIED MATERIALS & INTERFACES 2023; 15:58296-58308. [PMID: 38064379 DOI: 10.1021/acsami.3c11446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2023]
Abstract
Platinum (Pt) and Pt-based alloys have been extensively studied as efficient catalysts for both the anode and cathode of direct methanol fuel cells (DMFC). Defect engineering has been revealed to be practicable in tuning the charge transfer between Pt and transition metals/supports, which leads to the charge density rearrangement and facilitates the electrocatalytic performance. Herein, Pr-doped CeO2 nanocubes were used as the noncarbon support of a PtCu catalyst. The concentration and structure of oxygen vacancy (Vo) defects were engineered by Pr doping. Besides the Vo monomer, the oxygen vacancy with a linear structure is also observed, leading to the one-dimensional PtCu. The Vo concentration shows the volcanic scenario as Pr increased. Accordingly, the activities of PtCu/PrxCe1-xO2 toward methanol oxidation and oxygen reduction reactions exhibit the volcanic scenario. PtCu/Pr0.15Ce0.85O2 exhibits the optimal catalytic performance with the specific activity 3.57 times higher than that of Pt/C toward MOR and 1.34 times higher toward ORR. The MOR and ORR mass activities of PtCu/Pr0.15Ce0.85O2 reached 1.05 and 0.12 A·mg-1, which are 3.09 and 0.92 times the values of Pt/C, respectively. The abundant Vo afforded surplus electrons, which tailored the electron transfer between PtCu and PrxCe1-xO2, leading to enhanced catalytic performance of PtCu/PrxCe1-xO2. DFT calculations on PtCu/Pr0.15Ce0.85O2 revealed that Pr doping reduced the band gap of CeO2 and lowered the overpotential.
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Affiliation(s)
- Tianhua Zou
- College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, China
| | - Yifen Wang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, China
| | - Feng Xu
- College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, China
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Peng Y, Xiao X, Song L, Wang N, Chu W. Engineering the Quaternary Hydrotalcite-Derived Ce-Promoted Ni-Based Catalysts for Enhanced Low-Temperature CO 2 Hydrogenation into Methane. MATERIALS (BASEL, SWITZERLAND) 2023; 16:4642. [PMID: 37444955 DOI: 10.3390/ma16134642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Revised: 06/15/2023] [Accepted: 06/23/2023] [Indexed: 07/15/2023]
Abstract
Ce-promoted NiMgAl mixed-oxide (NiCex-C, x = 0, 1, 5, 10) catalysts were prepared from the quaternary hydrotalcite precursors for CO2 hydrogenation to methane. By engineering the Ce contents, NiCe5-C showed its prior catalytic performance in low-temperature CO2 hydrogenation, being about three times higher than that of the Ce-free NiCe0-C catalyst (turnover frequency of NiCe5-C and NiCe0-C: 11.9 h-1 vs. 3.9 h-1 @ 225 °C). With extensive characterization, it was found that Ce dopants promoted the reduction of NiO by adjusting the interaction between Ni and Mg(Ce)AlOx support. The highest ratio of surface Ni0/(Ni2+ + Ni0) was obtained over NiCe5-C. Meanwhile, the surface basicity was tailored with Ce dopants. The strongest medium-strength basicity and highest capacity of CO2 adsorption was achieved on NiCe5-C with 5 wt.% Ce content. The TOF tests indicated a good correlation with medium-strength basicity over the NiCex-C samples. The results showed that the high medium-strength and Ce-promoted surface Ni0 species endows the enhanced low-temperature catalytic performance in CO2 hydrogenation to methane.
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Affiliation(s)
- Yuxin Peng
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Xin Xiao
- College of Carbon Neutrality Future Technology, Sichuan University, Chengdu 610106, China
- National Engineering Research Centre for Flue Gas Desulfurization, Chengdu 610065, China
| | - Lei Song
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
| | - Ning Wang
- College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
| | - Wei Chu
- School of Chemical Engineering, Sichuan University, Chengdu 610065, China
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Liu Z, Xue S, Zhou S, Li J, Qu K, Cai W. Mutual promotion effect of Ni and Mo2C encapsulated in N-doped porous carbon on bifunctional overall urea oxidation catalysis. J Catal 2022. [DOI: 10.1016/j.jcat.2021.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Zou L, Pan J, Xu F, Chen J. Cu assisted loading of Pt on CeO 2 as a carbon-free catalyst for methanol and oxygen reduction reaction. RSC Adv 2021; 11:36726-36733. [PMID: 35494367 PMCID: PMC9043534 DOI: 10.1039/d1ra05501a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2021] [Accepted: 11/06/2021] [Indexed: 11/21/2022] Open
Abstract
The widely studied Pt/C catalyst for direct methanol fuel cells (DMFCs) suffers severe carbon corrosion under operation, which undermines the catalytic activity and durability. It is of great importance to develop a carbon-free support with co-catalytic functionality for improving both the activity and durability of Pt-based catalysts. The direct loading of Pt on the smooth surface of oxides may be difficult. Herein, the Cu assisted loading of Pt on CeO2 is developed. Cu pre-coated CeO2 was facilely synthesized and Pt was electrochemically deposited to fabricate the carbon-free PtCu/CeO2 catalyst. The PtCu/CeO2 catalyst has a mass activity up to 1.84 and 1.57 times higher than Pt/C towards methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR), respectively. Better durability is also confirmed by chronoamperometry and accelerated degradation tests. The strategy in this work would be greatly helpful for developing an efficient carbon-free support of Pt-based catalysts for applications in DMFCs.
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Affiliation(s)
- Linchi Zou
- College of Materials Science and Engineering, Fujian University of Technology Fuzhou 350118 China
- Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118 China
| | - Jian Pan
- College of Materials Science and Engineering, Fujian University of Technology Fuzhou 350118 China
| | - Feng Xu
- School of Materials Science and Engineering, Fuzhou University, Qishan Campus Fuzhou 350116 China
| | - Junfeng Chen
- School of Materials Science and Engineering, Fuzhou University, Qishan Campus Fuzhou 350116 China
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Chen L, Lin R, Yu X, Zheng T, Dong M, Lou M, Ma Y, Hao Z. Microporous Layer Containing CeO 2-Doped 3D Graphene Foam for Proton Exchange Membrane Fuel Cells at Varying Operating Conditions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:20201-20212. [PMID: 33896170 DOI: 10.1021/acsami.1c03699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
To improve the interfacial mass-transfer efficiency, microporous layers (MPLs) containing CeO2 nanorods and the CeO2 nano-network were prepared for proton exchange membrane fuel cells (PEMFCs). In order to minimize the contact resistance, the three-dimensional (3D) graphene foam (3D-GF) was used as the carrier for the deposition of CeO2 nanorods and the nano-network. The CeO2-doped 3D-GF anchored at the interface between the catalyst layer and microporous layer manufactured several novel functional protrusions. To evaluate the electrochemical property, the normal MPL, the MPL containing raw 3D-GF, and MPLs containing different kinds of CeO2-doped 3D-GF were used to assemble the membrane electrode assemblies (MEAs). Measurements show that the CeO2-doped 3D-GF improved the reaction kinetics of the cathode effectively. In addition, the hydrophilic CeO2-doped 3D-GF worked as the water receiver to prevent the dehydration of MEAs at dry operating condition. Besides, at a high current density or humid operating condition, the CeO2-doped 3D-GF provided the pathway for water removal. Compared with the CeO2 nanorods, the CeO2 nano-network on 3D-GF revealed a higher adaptability at varying operating conditions. Hence, such composition and structure design of MPL is a promising strategy for the optimization of high-performance PEMFCs.
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Affiliation(s)
- Liang Chen
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Rui Lin
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Xiaoting Yu
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Tong Zheng
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Mengcheng Dong
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Mingyu Lou
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Yunyang Ma
- School of Automotive Studies, Tongji University, Shanghai 201804, China
| | - Zhixian Hao
- School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
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Yao G, Zhu X, Wang M, Qiu Z, Zhang T, Qiu F. Controlled Fabrication of the Biomass Cellulose–CeO 2 Nanocomposite Membrane as Efficient and Recyclable Adsorbents for Fluoride Removal. Ind Eng Chem Res 2021. [DOI: 10.1021/acs.iecr.1c00012] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Guanglei Yao
- School of Chemistry, Jiangsu University, Zhenjiang 212013, China
| | - Xingtong Zhu
- School of Chemistry, Jiangsu University, Zhenjiang 212013, China
| | - Mingyou Wang
- Department of Resources and Environmental Engineering, Xingtai Polytechnic College, Xingtai, Hebei Province 054000, China
| | - Zhiwei Qiu
- School of Chemistry, Jiangsu University, Zhenjiang 212013, China
| | - Tao Zhang
- School of Chemistry, Jiangsu University, Zhenjiang 212013, China
- Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, 301 Xuefu Road, Zhenjiang, Jiangsu Province, China
| | - Fengxian Qiu
- School of Chemistry, Jiangsu University, Zhenjiang 212013, China
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Ge Y, Fu K, Zhao Q, Ji N, Song C, Ma D, Liu Q. Performance study of modified Pt catalysts for the complete oxidation of acetone. Chem Eng Sci 2019. [DOI: 10.1016/j.ces.2019.05.051] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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