Inku Kang , Won-Jong Choi , Hwan Yeop Jeong , Chang Jin Lee , Soonyong So , Duk Man Yu , Sang Jun Yoon , Hongsuk Kang , Dong-Won Kim , Keun-Hwan Oh
{"title":"阴极油墨配方对质子交换膜水电解槽氢交叉和电池性能的影响","authors":"Inku Kang , Won-Jong Choi , Hwan Yeop Jeong , Chang Jin Lee , Soonyong So , Duk Man Yu , Sang Jun Yoon , Hongsuk Kang , Dong-Won Kim , Keun-Hwan Oh","doi":"10.1016/j.jpowsour.2024.234978","DOIUrl":null,"url":null,"abstract":"<div><p>The permeation of H<sub>2</sub> through the membranes of proton exchange membrane water electrolyzers (PEMWEs) is a critical safety concern because of the risk of explosion when H<sub>2</sub> mixes with O<sub>2</sub> at the anode and increases in concentration. In this study, we investigated the modification of the cathode catalyst layer in the membrane electrode assembly as a strategy for achieving the safe operation of PEMWEs. The effects of the polytetrafluoroethylene (PTFE) content and type of ionomer in the cathode catalyst layer on the dissolved H<sub>2</sub> concentration, H<sub>2</sub> crossover, and electrochemical performance were investigated. The lowest dissolved H<sub>2</sub> concentration and H<sub>2</sub> permeation rate were achieved when 8 wt% PTFE was used. Consequently, the H<sub>2</sub> volume fraction in O<sub>2</sub> at the anode was less than 0.88 %. Additionally, using the Nafion ionomer (D520, ion exchange capacity: 1 mmol g<sup>−1</sup>), H<sub>2</sub> volume fractions of 1.27 % and 1.34 % were obtained at 0.08 and 5 A cm<sup>−2</sup>, respectively. These values are below the lower explosion limit of H<sub>2</sub> in O<sub>2</sub> (4 %), implying that the PEMWE can be safely operated in the low-to-high current density range under ambient pressure. These results provide key guidelines for the design of high-safety cathode catalyst layers for PEMWEs.</p></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0378775324009303/pdfft?md5=605fb9a90c8b54452e17df10899a4825&pid=1-s2.0-S0378775324009303-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Effect of cathode ink formulation on the hydrogen crossover and cell performance of proton exchange membrane water electrolyzers\",\"authors\":\"Inku Kang , Won-Jong Choi , Hwan Yeop Jeong , Chang Jin Lee , Soonyong So , Duk Man Yu , Sang Jun Yoon , Hongsuk Kang , Dong-Won Kim , Keun-Hwan Oh\",\"doi\":\"10.1016/j.jpowsour.2024.234978\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>The permeation of H<sub>2</sub> through the membranes of proton exchange membrane water electrolyzers (PEMWEs) is a critical safety concern because of the risk of explosion when H<sub>2</sub> mixes with O<sub>2</sub> at the anode and increases in concentration. In this study, we investigated the modification of the cathode catalyst layer in the membrane electrode assembly as a strategy for achieving the safe operation of PEMWEs. The effects of the polytetrafluoroethylene (PTFE) content and type of ionomer in the cathode catalyst layer on the dissolved H<sub>2</sub> concentration, H<sub>2</sub> crossover, and electrochemical performance were investigated. The lowest dissolved H<sub>2</sub> concentration and H<sub>2</sub> permeation rate were achieved when 8 wt% PTFE was used. Consequently, the H<sub>2</sub> volume fraction in O<sub>2</sub> at the anode was less than 0.88 %. Additionally, using the Nafion ionomer (D520, ion exchange capacity: 1 mmol g<sup>−1</sup>), H<sub>2</sub> volume fractions of 1.27 % and 1.34 % were obtained at 0.08 and 5 A cm<sup>−2</sup>, respectively. These values are below the lower explosion limit of H<sub>2</sub> in O<sub>2</sub> (4 %), implying that the PEMWE can be safely operated in the low-to-high current density range under ambient pressure. These results provide key guidelines for the design of high-safety cathode catalyst layers for PEMWEs.</p></div>\",\"PeriodicalId\":377,\"journal\":{\"name\":\"Journal of Power Sources\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.1000,\"publicationDate\":\"2024-07-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S0378775324009303/pdfft?md5=605fb9a90c8b54452e17df10899a4825&pid=1-s2.0-S0378775324009303-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Power Sources\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0378775324009303\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Power Sources","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0378775324009303","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Effect of cathode ink formulation on the hydrogen crossover and cell performance of proton exchange membrane water electrolyzers
The permeation of H2 through the membranes of proton exchange membrane water electrolyzers (PEMWEs) is a critical safety concern because of the risk of explosion when H2 mixes with O2 at the anode and increases in concentration. In this study, we investigated the modification of the cathode catalyst layer in the membrane electrode assembly as a strategy for achieving the safe operation of PEMWEs. The effects of the polytetrafluoroethylene (PTFE) content and type of ionomer in the cathode catalyst layer on the dissolved H2 concentration, H2 crossover, and electrochemical performance were investigated. The lowest dissolved H2 concentration and H2 permeation rate were achieved when 8 wt% PTFE was used. Consequently, the H2 volume fraction in O2 at the anode was less than 0.88 %. Additionally, using the Nafion ionomer (D520, ion exchange capacity: 1 mmol g−1), H2 volume fractions of 1.27 % and 1.34 % were obtained at 0.08 and 5 A cm−2, respectively. These values are below the lower explosion limit of H2 in O2 (4 %), implying that the PEMWE can be safely operated in the low-to-high current density range under ambient pressure. These results provide key guidelines for the design of high-safety cathode catalyst layers for PEMWEs.
期刊介绍:
The Journal of Power Sources is a publication catering to researchers and technologists interested in various aspects of the science, technology, and applications of electrochemical power sources. It covers original research and reviews on primary and secondary batteries, fuel cells, supercapacitors, and photo-electrochemical cells.
Topics considered include the research, development and applications of nanomaterials and novel componentry for these devices. Examples of applications of these electrochemical power sources include:
• Portable electronics
• Electric and Hybrid Electric Vehicles
• Uninterruptible Power Supply (UPS) systems
• Storage of renewable energy
• Satellites and deep space probes
• Boats and ships, drones and aircrafts
• Wearable energy storage systems