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Cui Z, Ren Z, Ma C, Chen B, Chen G, Lu R, Zhu W, Gan T, Wang Z, Zhuang Z, Han Y. Dilute RuCo Alloy Synergizing Single Ru and Co Atoms as Efficient and CO-Resistant Anode Catalyst for Anion Exchange Membrane Fuel Cells. Angew Chem Int Ed Engl 2024; 63:e202404761. [PMID: 38664844 DOI: 10.1002/anie.202404761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Indexed: 06/05/2024]
Abstract
Ruthenium (Ru) is considered a promising candidate catalyst for alkaline hydroxide oxidation reaction (HOR) due to its hydrogen binding energy (HBE) like that of platinum (Pt) and its much higher oxygenophilicity than that of Pt. However, Ru still suffers from insufficient intrinsic activity and CO resistance, which hinders its widespread use in anion exchange membrane fuel cells (AEMFCs). Here, we report a hybrid catalyst (RuCo)NC+SAs/N-CNT consisting of dilute RuCo alloy nanoparticles and atomically single Ru and Co atoms on N-doped carbon nanotubes The catalyst exhibits a state-of-the-art activity with a high mass activity of 7.35 A mgRu -1. More importantly, when (RuCo)NC+SAs/N-CNT is used as an anode catalyst for AEMFCs, its peak power density reaches 1.98 W cm-2, which is one of the best AEMFCs properties of noble metal-based catalysts at present. Moreover, (RuCo)NC+SAs/N-CNT has superior long-time stability and CO resistance. The experimental and density functional theory (DFT) results demonstrate that the dilute alloying and monodecentralization of the exotic element Co greatly modulates the electronic structure of the host element Ru, thus optimizing the adsorption of H and OH and promoting the oxidation of CO on the catalyst surface, and then stimulates alkaline HOR activity and CO tolerance of the catalyst.
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Affiliation(s)
- Zhibo Cui
- Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, 710072, China
| | - Zhanghao Ren
- School of Chemical Sciences, The University of Auckland, Auckland, 1010, New Zealand
| | - Chao Ma
- Department of Chemistry, Tsinghua University, Beijing, 100084, China
| | - Bowen Chen
- State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Guanzhen Chen
- Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, 710072, China
| | - Ruihu Lu
- School of Chemical Sciences, The University of Auckland, Auckland, 1010, New Zealand
| | - Wei Zhu
- State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Tao Gan
- Shanghai Synchrotron Radiation Facilities, Shanghai institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204, China
| | - Ziyun Wang
- School of Chemical Sciences, The University of Auckland, Auckland, 1010, New Zealand
| | - Zhongbin Zhuang
- State Key Lab of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China
| | - Yunhu Han
- Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, 710072, China
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Xiao Y, Lu J, Chen K, Cao Y, Gong C, Ke FS. Linkage Engineering in Covalent Organic Frameworks for Metal-Free Electrocatalytic C 2H 4 Production from CO 2. Angew Chem Int Ed Engl 2024; 63:e202404738. [PMID: 38634674 DOI: 10.1002/anie.202404738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 03/30/2024] [Accepted: 04/17/2024] [Indexed: 04/19/2024]
Abstract
Electrocatalytic carbon dioxide reduction reaction (CO2RR) to produce ethylene (C2H4) is conducive to sustainable development of energy and environment. At present, most electrocatalysts for C2H4 production are limited to the heavy metal copper, meanwhile, achieving metal-free catalysis remains a challenge. Noted piperazine with sp3 N hybridization is beneficial to CO2 capture, but CO2RR performance and mechanism have been lacking. Herein, based on linkage engineering, we construct a novel high-density sp3 N catalytic array via introducing piperazine into the crystalline and microporous aminal-linked covalent organic frameworks (COFs). Thanks to its high sp3 N density, strong CO2 capture capacity and great hydrophilicity, aminal-linked COF successfully achieves the conversion of CO2 to C2H4 with a Faraday efficiency up to 19.1 %, which is stand out in all reported metal-free COF electrocatalysts. In addition, a series of imine-linked COFs are synthesized and combined with DFT calculations to demonstrate the critical role of sp3 N in enhancing the kinetics of CO2RR. Therefore, this work reveals the extraordinary potential of linkage engineering in COFs to break through some catalytic bottlenecks.
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Affiliation(s)
- Yang Xiao
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Jie Lu
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Kean Chen
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yuliang Cao
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Chengtao Gong
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Fu-Sheng Ke
- Hubei Key Laboratory of Electrochemical Power Sources, Hubei Key Lab on Organic and Polymeric Opto-Electronic Materials, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
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Qin R, Chen G, Feng X, Weng J, Han Y. Ru/Ir-Based Electrocatalysts for Oxygen Evolution Reaction in Acidic Conditions: From Mechanisms, Optimizations to Challenges. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2309364. [PMID: 38501896 DOI: 10.1002/advs.202309364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 01/20/2024] [Indexed: 03/20/2024]
Abstract
The generation of green hydrogen by water splitting is identified as a key strategic energy technology, and proton exchange membrane water electrolysis (PEMWE) is one of the desirable technologies for converting renewable energy sources into hydrogen. However, the harsh anode environment of PEMWE and the oxygen evolution reaction (OER) involving four-electron transfer result in a large overpotential, which limits the overall efficiency of hydrogen production, and thus efficient electrocatalysts are needed to overcome the high overpotential and slow kinetic process. In recent years, noble metal-based electrocatalysts (e.g., Ru/Ir-based metal/oxide electrocatalysts) have received much attention due to their unique catalytic properties, and have already become the dominant electrocatalysts for the acidic OER process and are applied in commercial PEMWE devices. However, these noble metal-based electrocatalysts still face the thorny problem of conflicting performance and cost. In this review, first, noble metal Ru/Ir-based OER electrocatalysts are briefly classified according to their forms of existence, and the OER catalytic mechanisms are outlined. Then, the focus is on summarizing the improvement strategies of Ru/Ir-based OER electrocatalysts with respect to their activity and stability over recent years. Finally, the challenges and development prospects of noble metal-based OER electrocatalysts are discussed.
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Affiliation(s)
- Rong Qin
- Institute of Flexible Electronics (IFE), Ningbo Institute of Northwestern Polytechnical University, Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China
| | - Guanzhen Chen
- Institute of Flexible Electronics (IFE), Ningbo Institute of Northwestern Polytechnical University, Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China
| | - Xueting Feng
- Institute of Flexible Electronics (IFE), Ningbo Institute of Northwestern Polytechnical University, Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China
| | - Jiena Weng
- Institute of Flexible Electronics (IFE), Ningbo Institute of Northwestern Polytechnical University, Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China
| | - Yunhu Han
- Institute of Flexible Electronics (IFE), Ningbo Institute of Northwestern Polytechnical University, Frontiers Science Center for Flexible Electronics, Northwestern Polytechnical University, Xi'an, Shaanxi, 710129, China
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Yang S, Meng F, Li X, Fu Y, Xu Q, Zhang F. Tuning the Pyridine Units in Vinylene-Linked Covalent Organic Frameworks Boosting 2e - Oxygen Reduction Reaction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024:e2308801. [PMID: 38295007 DOI: 10.1002/smll.202308801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 01/10/2024] [Indexed: 02/02/2024]
Abstract
The N-doped carbon materials are supposed to be the efficient oxygen reduction reaction (ORR) catalysts with the undefined N-doped carbon ring groups. It is essential to well define the role of the nitrogen atoms of these carbon structures in active behavior. Even though, the covalent organic frameworks (COFs) with precise structures are well developed, but unable to exclude the polar linkages influence. This study presents a series of pyridine-containing COFs linked via nonpolar carbon-carbon double bonds (C = C). Their catalytic activity and selectivity for 2e- ORR are successfully modulated by locating the embedded pyridine nitrogen in the backbones through the linking modes of pyridine moieties within the frameworks. Such phenomena can be attributed to their different binding abilities toward O2 , leading to the different binding strength of the intermediate OH* to the catalytic sites, also verified by the theoretical calculation. This work provides us a new insight to design high-efficiency ORR catalysts through the exact location of pyridine nitrogen.
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Affiliation(s)
- Shuai Yang
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai, 201210, P. R. China
| | - Fancheng Meng
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, P. R. China
| | - Xiaomeng Li
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, P. R. China
| | - Yubin Fu
- Center for Advancing Electronics Dresden (cfaed), Faculty of Chemistry, Food Chemistry, Technische Universität Dresden, 01062, Dresden, Germany
| | - Qing Xu
- CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Science, Shanghai, 201210, P. R. China
| | - Fan Zhang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai, P. R. China
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