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Gao C, Li L, Yan X, Zhang N, Bao J, Zhang X, Li Y. Triethylenediamine cobalt complex encapsulated in a metal-organic framework cage to prepare a cobalt single-atom catalyst with a high Co-N 4 density for an efficient oxygen reduction reaction. J Colloid Interface Sci 2024; 653:296-307. [PMID: 37717430 DOI: 10.1016/j.jcis.2023.09.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/18/2023] [Accepted: 09/05/2023] [Indexed: 09/19/2023]
Abstract
Transition metal single atom catalysts (TM SACs) are the most promising oxygen reduction reaction (ORR) catalysts for proton exchange membrane fuel cells (PEMFCs) and metal-air batteries. However, the low density of M-Nx active sites seriously hinders further improvement of the ORR electrocatalytic activity. Here, a strategy for encapsulating nitrogen-rich guest molecules (triethylenediamine cobalt complex, [Co(en)3]3+) was proposed to construct a high-performance cobalt single-atom catalyst (Co-encapsulated SAC/NC). With this strategy, the guest molecules are encapsulated into metal-organic framework (MOF) cages as an additional cobalt source to boost cobalt loading, while abundant nitrogen from guest molecules contributes to the formation of Co-N4 active sites. Remarkably, the resulting Co-encapsulated SAC/NC has a high cobalt loading amount of 4.03 wt%, and spherical aberration-corrected transmission electron microscopy (AC-TEM) has confirmed that most cobalt exists in a single-atom state. As a result, the Co-encapsulated SAC/NC exhibits excellent ORR catalytic performance with a half-wave potential of 0.88 V. Furthermore, Zn-air batteries employing Co-encapsulated SAC/NC as air cathode show high peak power density and excellent cycling stability. Density functional theory (DFT) calculations reveal that adjacent active sites have different rate-determining steps and lower reaction energy barriers than a single active site.
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Affiliation(s)
- Cheng Gao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Longzhu Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Xiaoming Yan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Ning Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Junjiang Bao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Xiaopeng Zhang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China; School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China
| | - Yanqiang Li
- School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
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Sun L, Yan Y, Chen S, Zhou Z, Tao W, Li C, Feng Y, Wang F. Co-N-C single-atom nanozymes with oxidase-like activity for highly sensitive detection of biothiols. Anal Bioanal Chem 2022. [PMID: 35028690 DOI: 10.1007/s00216-021-03816-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Revised: 11/21/2021] [Accepted: 11/30/2021] [Indexed: 12/31/2022]
Abstract
Biothiol detection is of great importance for clinical disease diagnosis. Previous nanozyme-based colorimetric sensors for biothiol detection showed unsatisfactory catalytic activity, which led to a high detection limit. Therefore, developing new nanozymes with the high catalytic activity for biothiol detection is extremely necessary. Recently, single-atom nanozymes (SAzymes) have attracted much attention in biosensing due to their 100% atom utilization and excellent catalytic activity. Most previous works focus on the peroxidase-like activity of Fe-based SAzymes by using unstable and destructive H2O2 as the oxidant. It is essential to develop new SAzymes with high oxidase-like activity for biosensing to break through the limitation. Herein, Co-N-C SAzymes with high oxidase-like activity are explored. Furthermore, Co-N-C SAzymes are used as a biosensor for colorimetric detection of biothiols (GSH/Cys) based on the inhibition of thiols toward the oxidase-like activity of Co-N-C SAzymes, which showed high sensitivity with a low detection limit of 0.07 µM for GSH and 0.06 µM for Cys. Besides, the method showed good reproducibility and high selectivity against other amino acids. This work offers new insights using Co-N-C SAzymes in the biosensing field.
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Wu J, Chen J, Huang Y, Feng K, Deng J, Huang W, Wu Y, Zhong J, Li Y. Cobalt atoms dispersed on hierarchical carbon nitride support as the cathode electrocatalyst for high-performance lithium-polysulfide batteries. Sci Bull (Beijing) 2019; 64:1875-1880. [PMID: 36659582 DOI: 10.1016/j.scib.2019.08.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/21/2019] [Accepted: 08/12/2019] [Indexed: 01/21/2023]
Abstract
Lithium-sulfur batteries are promising candidates for next-generation energy storage but are confronted with several challenges. One of the possible solutions is to design proper cathode electrocatalysts to accelerate the redox interconversion of solvated polysulfide intermediates. Herein, we report cobalt atoms dispersed on hierarchical carbon nitride support as an effective cathode electrocatalyst for lithium-polysulfide batteries. The electrocatalyst material is prepared from the simple reaction between melamine and cyanuric acid in the presence of Co2+, followed by the Ar annealing. The product has a unique hierarchical structure consisting of many thin and porous C3N4 nanosheets finely dispersed with Co atoms. The atomic dispersion of Co species is confirmed by X-ray absorption experiments. Electrochemical measurements reveal that it can promote the interconversion of polysulfides. As a result, batteries using this cathode electrocatalyst achieve large capacity (∼1400 mAh/g at 1.6 mA/cm2), good rate performance (∼800 mAh/g at 12.8 mA/cm2) and impressive cycling stability under different current densities and different sulfur loadings.
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Affiliation(s)
- Jialing Wu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Junmei Chen
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Yang Huang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Kun Feng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Jun Deng
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Wei Huang
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Yunling Wu
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Jun Zhong
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China
| | - Yanguang Li
- Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China.
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