{"title":"分散剂对高性能聚合物电解质膜燃料电池催化剂油墨性能及催化剂层结构的影响","authors":"Soonyong So , Keun-Hwan Oh","doi":"10.1016/j.jpowsour.2023.232664","DOIUrl":null,"url":null,"abstract":"<div><p>Here, catalyst ink is prepared using a dispersant with the hydrophile-lipophile balance (HLB) value of 17. The effects of the ionomer-catalyst agglomerate size on the ink rheological properties, and subsequent catalyst layer (CL) microstructure and electrochemical performance are investigated to elucidate the relationship between ink properties and cell performance. Results shows that the smallest agglomerate size (2.7 μm) and polydispersity index (PDI, 0.068) are obtained with 1 wt% dispersant content; the low PDI indicate that the ink is well dispersed. Steady-state and thixotropy tests also show that the ink has shear-thinning and gel-like behavior (Recovery ratio: 30.4%). It is proposed that this occurs because the agglomerates are smaller and the interaction forces between them increase. Thus, the ink structure is maintained until the dried CL is formed, and as a result, the pore volume of CL with 1 wt% dispersant is increased compared to those with 0 and 9 wt%. In addition, the 1 wt% CL-based MEA shows the highest performance (1224.4 mA cm<sup>−2</sup> at 100% RH) owing the increase in the number of channels (1190 mA cm<sup>−2</sup> in four-channel) and back pressure (1240 mA cm<sup>−2</sup> at 1.5 bar<sub>ca</sub>).</p></div>","PeriodicalId":377,"journal":{"name":"Journal of Power Sources","volume":null,"pages":null},"PeriodicalIF":8.1000,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Effect of dispersant on catalyst ink properties and catalyst layer structure for high performance polymer electrolyte membrane fuel cells\",\"authors\":\"Soonyong So , Keun-Hwan Oh\",\"doi\":\"10.1016/j.jpowsour.2023.232664\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Here, catalyst ink is prepared using a dispersant with the hydrophile-lipophile balance (HLB) value of 17. The effects of the ionomer-catalyst agglomerate size on the ink rheological properties, and subsequent catalyst layer (CL) microstructure and electrochemical performance are investigated to elucidate the relationship between ink properties and cell performance. Results shows that the smallest agglomerate size (2.7 μm) and polydispersity index (PDI, 0.068) are obtained with 1 wt% dispersant content; the low PDI indicate that the ink is well dispersed. Steady-state and thixotropy tests also show that the ink has shear-thinning and gel-like behavior (Recovery ratio: 30.4%). It is proposed that this occurs because the agglomerates are smaller and the interaction forces between them increase. Thus, the ink structure is maintained until the dried CL is formed, and as a result, the pore volume of CL with 1 wt% dispersant is increased compared to those with 0 and 9 wt%. In addition, the 1 wt% CL-based MEA shows the highest performance (1224.4 mA cm<sup>−2</sup> at 100% RH) owing the increase in the number of channels (1190 mA cm<sup>−2</sup> in four-channel) and back pressure (1240 mA cm<sup>−2</sup> at 1.5 bar<sub>ca</sub>).</p></div>\",\"PeriodicalId\":377,\"journal\":{\"name\":\"Journal of Power Sources\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":8.1000,\"publicationDate\":\"2023-03-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Power Sources\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0378775323000393\",\"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/S0378775323000393","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}
引用次数: 3
摘要
在这里,催化剂油墨是使用分散剂的亲水-亲脂平衡(HLB)值为17。研究了离子-催化剂团聚体尺寸对油墨流变性能的影响,以及随后催化剂层(CL)微观结构和电化学性能的影响,以阐明油墨性能与电池性能之间的关系。结果表明:当分散剂含量为1 wt%时,团聚体粒径最小(2.7 μm),多分散性指数(PDI)为0.068;低PDI表明油墨分散良好。稳态和触变性试验也表明,该油墨具有剪切变薄和凝胶样行为(回收率为30.4%)。有人提出,这是因为团聚体较小,它们之间的相互作用力增加。因此,油墨结构被保持直到干燥的CL形成,结果,与那些0和9 wt%的分散剂相比,含有1 wt%分散剂的CL的孔隙体积增加。此外,由于通道数量(四通道1190 mA cm - 2)和背压(1.5 barca时1240 mA cm - 2)的增加,1 wt% CL-based MEA表现出最高的性能(100% RH时1224.4 mA cm - 2)。
Effect of dispersant on catalyst ink properties and catalyst layer structure for high performance polymer electrolyte membrane fuel cells
Here, catalyst ink is prepared using a dispersant with the hydrophile-lipophile balance (HLB) value of 17. The effects of the ionomer-catalyst agglomerate size on the ink rheological properties, and subsequent catalyst layer (CL) microstructure and electrochemical performance are investigated to elucidate the relationship between ink properties and cell performance. Results shows that the smallest agglomerate size (2.7 μm) and polydispersity index (PDI, 0.068) are obtained with 1 wt% dispersant content; the low PDI indicate that the ink is well dispersed. Steady-state and thixotropy tests also show that the ink has shear-thinning and gel-like behavior (Recovery ratio: 30.4%). It is proposed that this occurs because the agglomerates are smaller and the interaction forces between them increase. Thus, the ink structure is maintained until the dried CL is formed, and as a result, the pore volume of CL with 1 wt% dispersant is increased compared to those with 0 and 9 wt%. In addition, the 1 wt% CL-based MEA shows the highest performance (1224.4 mA cm−2 at 100% RH) owing the increase in the number of channels (1190 mA cm−2 in four-channel) and back pressure (1240 mA cm−2 at 1.5 barca).
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