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Yang B, Han Q, Han L, Leng Y, O'Carroll T, Yang X, Wu G, Xiang Z. Porous Covalent Organic Polymer Coordinated Single Co Site Nanofibers for Efficient Oxygen-Reduction Cathodes in Polymer Electrolyte Fuel Cells. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2208661. [PMID: 36314400 DOI: 10.1002/adma.202208661] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 10/20/2022] [Indexed: 06/16/2023]
Abstract
Nitrogen-coordinated single-cobalt-atom electrocatalysts, particularly ones derived from high-temperature pyrolysis of cobalt-based zeolitic imidazolate frameworks (ZIFs), have emerged as a new frontier in the design of oxygen reduction cathodes in polymer electrolyte fuel cells (PEFCs) due to their enhanced durability and smaller Fenton effects related to the degradation of membranes and ionomers compared with emphasized iron-based electrocatalysts. However, pyrolysis techniques lead to obscure active-site configurations, undesirably defined porosity and morphology, and fewer exposed active sites. Herein, a highly stable cross-linked nanofiber electrode is directly prepared by electrospinning using a liquid processability cobalt-based covalent organic polymer (Co-COP) obtained via pyrolysis-free strategy. The resultant fibers can be facilely organized into a free-standing large-area film with a uniform hierarchical porous texture and a full dispersion of atomic Co active sites on the catalyst surface. Focused ion beam-field emission scanning electron microscopy and computational fluid dynamics experiments confirm that the relative diffusion coefficient is enhanced by 3.5 times, which can provide an efficient route both for reactants to enter the active sites, and drain away the produced water efficiently. Resultingly, the peak power density of the integrated Co-COP nanofiber electrode is remarkably enhanced by 1.72 times along with significantly higher durability compared with conventional spraying methods. Notably, this nanofabrication technique also maintains excellent scalability and uniformity.
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Affiliation(s)
- Bolong Yang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Qing Han
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Linkai Han
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Yiming Leng
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
| | - Thomas O'Carroll
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14032, USA
| | - Xiaoxuan Yang
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14032, USA
| | - Gang Wu
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14032, USA
| | - Zhonghua Xiang
- State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, P. R. China
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Fan M, Cui L, He X, Zou X. Emerging Heterogeneous Supports for Efficient Electrocatalysis. SMALL METHODS 2022; 6:e2200855. [PMID: 36070422 DOI: 10.1002/smtd.202200855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Revised: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Electrocatalysis plays a fundamental role in many fields, such as metallurgy, medicine, chemical industry, and energy conversion. Anchoring active electrocatalysts with controllable loading and uniform dispersion onto suitable supports has become an attractive topic. This is because the supports can not only have the potential to improve catalytic activity and stability through the interaction between support and catalytic center, but also can reduce precious metal consumption by improving atomic utilization. Herein, recent theoretical and experimental progresses concerning the development of supports to anchor electrocatalytic materials are first reviewed. Next, their controllable syntheses, characterization techniques, metal-support electronic interactions, and structure-performance relationships are presented. Some representative carbon supports and non-carbonaceous supports, as well as recently reported star supports such as 2D supports, single atom catalysts, and self-supported catalysts are also summarized. In addition, the significant role of support in stabilizing and regulating catalytic active sites is particularly emphasized. Finally, challenges, opportunities, key problems, and further promising solutions for supported catalysts are proposed.
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Affiliation(s)
- Meihong Fan
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China
| | - Lili Cui
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China
| | - Xingquan He
- School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, China
| | - Xiaoxin Zou
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun, 130012, China
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Wei M, Cai A, He H, Wu S, Zhang G, Zhang F, Peng W, Fan X, Li Y. Atomically Dispersed Fe-N 5 Sites Anchored on 3D N-Doped Porous Carbon for Efficient Selective Oxidation of Aromatic Alkanes at Room Temperature. ACS APPLIED MATERIALS & INTERFACES 2022; 14:36007-36018. [PMID: 35895975 DOI: 10.1021/acsami.2c05343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
On account of the increasing demand for aromatic ketones and the challenging task of mass production in the chemical industry, efficient and sustainable catalysts are urgently needed to catalyze the conversion of aromatic alkyl compounds into high value-added products via the activation of C-H bonds. Herein, Fe single-site atoms anchored on a N-doped three-dimensional (3D) porous carbon nanostructure (Fe-MEG-800) synthesized through the self-assembly hydrothermal method are reported. Detailed characterization analyses, such as aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM), are employed to prove the isolated single Fe atom dispersing on the carbon nanostructure, along with X-ray absorption spectroscopy (XAS) and Mössbauer spectroscopy analysis confirming the Fe-N5 coordination structure. Furthermore, the 3D cross-linked structure not only provides an abundant open-framework structure for the mass transfer during the reaction but also facilitates the exposure of more active sites and promotes the reaction procedure. The as-prepared catalyst possesses high catalytic activity toward the C-H bond at room temperature. In the model reaction of oxidizing ethylbenzene (EB) to high-value acetophenone (AcPO), the conversion and the selectivity of the reaction are both over 99%. In addition, the catalyst also presents favorable stability with retaining high performance even after eight cycles. The possible adsorption sites of the reactant and oxidant are explored through density functional theory (DFT) calculations. Based on the analysis of experimental and theoretical results, a possible mechanism for the oxidation of EB to AcPO involving •OH, O2•-, and 1O2 is also proposed.
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Affiliation(s)
- Mengying Wei
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - An Cai
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Hongwei He
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Shun Wu
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Guoliang Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Fengbao Zhang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Wenchao Peng
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Institute of Shaoxing, Tianjin University, Zhejiang 312300, China
| | - Xiaobin Fan
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Institute of Shaoxing, Tianjin University, Zhejiang 312300, China
| | - Yang Li
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
- Institute of Shaoxing, Tianjin University, Zhejiang 312300, China
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Li T, Deng Y, Rong X, He C, Zhou M, Tang Y, Zhou H, Cheng C, Zhao C. Nanostructures and catalytic atoms engineering of tellurium‐based materials and their roles in electrochemical energy conversion. SMARTMAT 2022. [DOI: 10.1002/smm2.1142] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Tiantian Li
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Yuting Deng
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Xiao Rong
- Department of Nephrology, Department of Ultrasound, West China Hospital Sichuan University Chengdu China
| | - Chao He
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
- Department of Physics, Chemistry and Pharmacy, Danish Institute for Advanced Study (DIAS) University of Southern Denmark Odense Denmark
| | - Mi Zhou
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Yuanjiao Tang
- Department of Nephrology, Department of Ultrasound, West China Hospital Sichuan University Chengdu China
| | - Hongju Zhou
- Department of Nephrology, Department of Ultrasound, West China Hospital Sichuan University Chengdu China
| | - Chong Cheng
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
- Med‐X Center for Materials Sichuan University Chengdu China
| | - Changsheng Zhao
- State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering Sichuan University Chengdu China
- Med‐X Center for Materials Sichuan University Chengdu China
- College of Chemical Engineering Sichuan University Chengdu China
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Fan Z, Cui X, Wei J, Chen C, Tang H, Li J. Host-guest interactions promoted formation of Fe-N 4 active site toward efficient oxygen reduction reaction catalysis. J Colloid Interface Sci 2022; 621:195-204. [PMID: 35461134 DOI: 10.1016/j.jcis.2022.04.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Revised: 04/08/2022] [Accepted: 04/09/2022] [Indexed: 11/18/2022]
Abstract
FeNC is the most promising material to replace the noble metal catalyst for cathodic oxygen reduction reaction in proton exchange membrane fuel cells (PEMFCs). However, the practical performance of FeNC catalyst is significantly limited by its low active site (Fe-N4) density. Herein, we propose to promote the formation of Fe-N4 active sites in FeNC catalyst by strengthening the interaction of N precursors and Fe precursors during the carbonization synthesis. In our approach, ionic liquid (IL, [EMIM][NTf2]) with high nitrogen content and good thermal stability is caged in the pores of Fe-ZIF-8 through the host-guest interactions. These interactions are critical for the preservation of Fe and N species and formation of active sites during the synthesis. The optimal catalyst developed with this approach (Fe0.05NC/10) has a high density of accessible Fe-N4 sites (1.88*1019 sites g-1). Therefore, in both acidic and alkaline media, Fe0.05NC/10 showed excellent ORR activity comparable to commercial Pt/C catalyst. Moreover, PEMFC performance with a peak power density of 300 mW cm-2 was demonstrated with Fe0.05NC/10 under H2/O2 conditions. The synthetic approach reported herein may be used for tailoring of advanced catalyst with high intrinsic activity.
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Affiliation(s)
- Zhengwen Fan
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Xinjiao Cui
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Jiankun Wei
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China; Research Center for Materials Genome Engineering, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Chan Chen
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Haolin Tang
- Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu hydrogen Valley, Foshan 528200, PR China
| | - Junsheng Li
- School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, Wuhan 430070, PR China; Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu hydrogen Valley, Foshan 528200, PR China.
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Yisilamu Z, Maimaitiyiming X, Liu A. Silk‐Derived N‐Doped Fe@NPC as Efficient Bifunctional Electrocatalyst for Direct Methanol Fuel Cell (DMFC). ChemistrySelect 2022. [DOI: 10.1002/slct.202104427] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zuerguli Yisilamu
- Key Laboratory of Energy Materials Chemistry Ministry of Education Key Laboratory of Advanced Functional Materials, Autonomous Region Institute of Applied Chemistry College of Chemistry Xinjiang University Urumqi 830046 Xinjiang PR China
| | - Xieraili Maimaitiyiming
- Key Laboratory of Energy Materials Chemistry Ministry of Education Key Laboratory of Advanced Functional Materials, Autonomous Region Institute of Applied Chemistry College of Chemistry Xinjiang University Urumqi 830046 Xinjiang PR China
| | - Anjie Liu
- Key Laboratory of Energy Materials Chemistry Ministry of Education Key Laboratory of Advanced Functional Materials, Autonomous Region Institute of Applied Chemistry College of Chemistry Xinjiang University Urumqi 830046 Xinjiang PR China
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