Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes
The rich −SO<sub>3</sub>H groups enable sulfonated poly (ether ether ketone) (SPEEK) to possess excellent proton conductivities in proton exchange membrane (PEM), but cause excessive water absorption, resulting in the decline of dimensional stability. It is a challenge to resolve the con...
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MDPI AG
2022-10-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/12/19/3518 |
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| author | Xiaoyu Meng Yinan Lv Lei Ding Luman Peng Qiwang Peng Chuanbo Cong Haimu Ye Qiong Zhou |
| author_facet | Xiaoyu Meng Yinan Lv Lei Ding Luman Peng Qiwang Peng Chuanbo Cong Haimu Ye Qiong Zhou |
| author_sort | Xiaoyu Meng |
| collection | DOAJ |
| description | The rich −SO<sub>3</sub>H groups enable sulfonated poly (ether ether ketone) (SPEEK) to possess excellent proton conductivities in proton exchange membrane (PEM), but cause excessive water absorption, resulting in the decline of dimensional stability. It is a challenge to resolve the conflict between conductivity and stability. Owing to its unique structural designability, covalent organic frameworks (COFs) have been used to regulate the performances of PEMs. The authors propose the use of COFs with acidic and basic groups for meeting the requirements of proton conductivity and dimensional stability. Herein, COFs containing different groups (sulfoacid, pyridine, and both) were uniformly dispersed into the SPEEK matrix by in situ synthesis, and the effects on the properties of SPEEK matrix PEMs were revealed. The sulfoacid group significantly improves proton conductivities. At 60 °C, under 95% RH, the conductivity of the SPEEK/TpPa−SO<sub>3</sub>H-20 composite membrane was 443.6 mS·cm<sup>−1</sup>, which was 3.3 times that of the pristine SPEEK membrane. The pyridine group reduced the swelling ratio at 50 °C from 220.7% to 2.4%, indicating an enhancement in dimensional stability. Combining the benefits of sulfoacid and pyridine groups, SPEEK/TpPa−(SO<sub>3</sub>H-Py) composite membrane has a conductivity of 360.3 mS·cm<sup>−1</sup> at 60 °C and 95% RH, which is 1.86 times that of SPEEK, and its swelling ratio is 11.8%, about 1/20 of that of SPEEK membrane. The method of in situ combination and regulation of groups open up a way for the development of SPEEK/COFs composite PEMs. |
| first_indexed | 2024-03-09T21:21:19Z |
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| language | English |
| last_indexed | 2024-03-09T21:21:19Z |
| publishDate | 2022-10-01 |
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| series | Nanomaterials |
| spelling | doaj.art-f79699babd3540238ae9bbad0ba093192023-11-23T21:21:26ZengMDPI AGNanomaterials2079-49912022-10-011219351810.3390/nano12193518Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange MembranesXiaoyu Meng0Yinan Lv1Lei Ding2Luman Peng3Qiwang Peng4Chuanbo Cong5Haimu Ye6Qiong Zhou7Department of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaCSSC Systems Engineering Research Institute, Beijing 100036, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaDepartment of Materials Science and Engineering, College of New Energy and Materials, China University of Petroleum, Beijing 102249, ChinaThe rich −SO<sub>3</sub>H groups enable sulfonated poly (ether ether ketone) (SPEEK) to possess excellent proton conductivities in proton exchange membrane (PEM), but cause excessive water absorption, resulting in the decline of dimensional stability. It is a challenge to resolve the conflict between conductivity and stability. Owing to its unique structural designability, covalent organic frameworks (COFs) have been used to regulate the performances of PEMs. The authors propose the use of COFs with acidic and basic groups for meeting the requirements of proton conductivity and dimensional stability. Herein, COFs containing different groups (sulfoacid, pyridine, and both) were uniformly dispersed into the SPEEK matrix by in situ synthesis, and the effects on the properties of SPEEK matrix PEMs were revealed. The sulfoacid group significantly improves proton conductivities. At 60 °C, under 95% RH, the conductivity of the SPEEK/TpPa−SO<sub>3</sub>H-20 composite membrane was 443.6 mS·cm<sup>−1</sup>, which was 3.3 times that of the pristine SPEEK membrane. The pyridine group reduced the swelling ratio at 50 °C from 220.7% to 2.4%, indicating an enhancement in dimensional stability. Combining the benefits of sulfoacid and pyridine groups, SPEEK/TpPa−(SO<sub>3</sub>H-Py) composite membrane has a conductivity of 360.3 mS·cm<sup>−1</sup> at 60 °C and 95% RH, which is 1.86 times that of SPEEK, and its swelling ratio is 11.8%, about 1/20 of that of SPEEK membrane. The method of in situ combination and regulation of groups open up a way for the development of SPEEK/COFs composite PEMs.https://www.mdpi.com/2079-4991/12/19/3518PEMsSPEEKproton conductivitiesdimensional stabilitiescovalent organic frameworks |
| spellingShingle | Xiaoyu Meng Yinan Lv Lei Ding Luman Peng Qiwang Peng Chuanbo Cong Haimu Ye Qiong Zhou Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes Nanomaterials PEMs SPEEK proton conductivities dimensional stabilities covalent organic frameworks |
| title | Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes |
| title_full | Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes |
| title_fullStr | Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes |
| title_full_unstemmed | Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes |
| title_short | Effect of Covalent Organic Frameworks Containing Different Groups on Properties of Sulfonated Poly(ether ether ketone) Matrix Proton Exchange Membranes |
| title_sort | effect of covalent organic frameworks containing different groups on properties of sulfonated poly ether ether ketone matrix proton exchange membranes |
| topic | PEMs SPEEK proton conductivities dimensional stabilities covalent organic frameworks |
| url | https://www.mdpi.com/2079-4991/12/19/3518 |
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