Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells
In this paper, a cobalt (Co)-chelated polynaphthalene imine (Co-PNIM) was calcined to become an oxygen reduction reaction (ORR) electrocatalyst (Co-N-C) as the cathode catalyst (CC) of an anion exchange membrane fuel cell (AEMFC). The X-ray diffraction pattern of CoNC-1000A900 illustrated that the c...
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MDPI AG
2023-08-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/13/9/769 |
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| author | Yu-Chang Huang Yen-Zen Wang Tar-Hwa Hsieh Ko-Shan Ho |
| author_facet | Yu-Chang Huang Yen-Zen Wang Tar-Hwa Hsieh Ko-Shan Ho |
| author_sort | Yu-Chang Huang |
| collection | DOAJ |
| description | In this paper, a cobalt (Co)-chelated polynaphthalene imine (Co-PNIM) was calcined to become an oxygen reduction reaction (ORR) electrocatalyst (Co-N-C) as the cathode catalyst (CC) of an anion exchange membrane fuel cell (AEMFC). The X-ray diffraction pattern of CoNC-1000A900 illustrated that the carbon matrix develops clear C(002) and Co(111) planes after calcination, which was confirmed using high-resolution TEM pictures. Co-N-Cs also demonstrated a significant ORR peak at 0.8 V in a C–V (current vs. voltage) curve and produced an extremely limited reduction current density (5.46 mA cm<sup>−2</sup>) comparable to commercial Pt/C catalysts (5.26 mA cm<sup>−2</sup>). The measured halfway potential of Co-N-C (0.82 V) was even higher than that of Pt/C (0.81 V). The maximum power density (P<sub>max</sub>) of the AEM single cell upon applying Co-N-C as the CC was 243 mW cm<sup>−2</sup>, only slightly lower than that of Pt/C (280 mW cm<sup>−2</sup>). The Tafel slope of CoNC-1000A900 (33.3 mV dec<sup>−1</sup>) was lower than that of Pt/C (43.3 mV dec<sup>−1</sup>). The limited reduction current density only decayed by 7.9% for CoNC-1000A900, compared to 22.7% for Pt/C, after 10,000 redox cycles. |
| first_indexed | 2024-03-10T22:28:38Z |
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| id | doaj.art-0ea4a152f3214e3fb610ef3e0d3d1bc8 |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T22:28:38Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-0ea4a152f3214e3fb610ef3e0d3d1bc82023-11-19T11:54:13ZengMDPI AGMembranes2077-03752023-08-0113976910.3390/membranes13090769Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel CellsYu-Chang Huang0Yen-Zen Wang1Tar-Hwa Hsieh2Ko-Shan Ho3Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415, Chien-Kuo Road, Kaohsiung 80782, TaiwanDepartment of Chemical and Materials Engineering, National Yu-Lin University of Science & Technology, 123, Sec. 3, University Road, Dou-Liu City, Yun-Lin 64301, TaiwanDepartment of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415, Chien-Kuo Road, Kaohsiung 80782, TaiwanDepartment of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415, Chien-Kuo Road, Kaohsiung 80782, TaiwanIn this paper, a cobalt (Co)-chelated polynaphthalene imine (Co-PNIM) was calcined to become an oxygen reduction reaction (ORR) electrocatalyst (Co-N-C) as the cathode catalyst (CC) of an anion exchange membrane fuel cell (AEMFC). The X-ray diffraction pattern of CoNC-1000A900 illustrated that the carbon matrix develops clear C(002) and Co(111) planes after calcination, which was confirmed using high-resolution TEM pictures. Co-N-Cs also demonstrated a significant ORR peak at 0.8 V in a C–V (current vs. voltage) curve and produced an extremely limited reduction current density (5.46 mA cm<sup>−2</sup>) comparable to commercial Pt/C catalysts (5.26 mA cm<sup>−2</sup>). The measured halfway potential of Co-N-C (0.82 V) was even higher than that of Pt/C (0.81 V). The maximum power density (P<sub>max</sub>) of the AEM single cell upon applying Co-N-C as the CC was 243 mW cm<sup>−2</sup>, only slightly lower than that of Pt/C (280 mW cm<sup>−2</sup>). The Tafel slope of CoNC-1000A900 (33.3 mV dec<sup>−1</sup>) was lower than that of Pt/C (43.3 mV dec<sup>−1</sup>). The limited reduction current density only decayed by 7.9% for CoNC-1000A900, compared to 22.7% for Pt/C, after 10,000 redox cycles.https://www.mdpi.com/2077-0375/13/9/769ORR catalystCo-chelatedpolynaphthalene iminecathode catalystAEMFC |
| spellingShingle | Yu-Chang Huang Yen-Zen Wang Tar-Hwa Hsieh Ko-Shan Ho Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells Membranes ORR catalyst Co-chelated polynaphthalene imine cathode catalyst AEMFC |
| title | Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells |
| title_full | Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells |
| title_fullStr | Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells |
| title_full_unstemmed | Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells |
| title_short | Co(II)-Chelated Polyimines as Oxygen Reduction Reaction Catalysts in Anion Exchange Membrane Fuel Cells |
| title_sort | co ii chelated polyimines as oxygen reduction reaction catalysts in anion exchange membrane fuel cells |
| topic | ORR catalyst Co-chelated polynaphthalene imine cathode catalyst AEMFC |
| url | https://www.mdpi.com/2077-0375/13/9/769 |
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