{"title":"生物聚合物作为硫化镍钴超级电容器电极的三维结构粘合剂","authors":"Jiamei Li , Zhe Chen , Fuqiang Chen , Zhijin Zhu , Tongwei Shen , Yunxiang Chen , Yaliang Chen , Yanqun Shao","doi":"10.1016/j.electacta.2024.145345","DOIUrl":null,"url":null,"abstract":"<div><div>Ion diffusion and electron transfer are hindered by commonly used hydrophobic binders, which directly affect the electrochemical performance of the electrodes. Hydrophilic binders are selected to efficaciously solve the problem of relatively low actual specific capacitance and rate performance in the field of nickel cobalt sulfide electrode materials. In the paper, RuCoNiS electrodes were prepared using polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), xanthan gum (XG), and chitosan (CS) as binders. The surface wettability, morphological structure, specific surface area, and electrochemical performance of electrodes with different binders were analyzed by XRD, SEM, BET, CV, GCD, and EIS, etc. It's shown that the synthesis of CoNi<sub>2</sub>S is confirmed by XRD. The XPS results verify the existence of RuO<sub>2</sub> and Ni<sup>2+</sup>/Ni<sup>3+</sup> and Co<sup>2+</sup>/Co<sup>3+</sup> redox couples. A cross-linked network structure is formed on the surface of the RuCoNiS by CS. The CS-RuCoNiS electrode has the largest specific surface area and microporosity. Ion migration in the electrolyte is facilitated by the excellent wettability of the CS-RuCoNiS electrode. The CS-RuCoNiS electrode reachs 1193.52 F g<sup>-1</sup>, which is 1.74 times higher than that of the PTFE-RuCoNiS electrode at 1 A g<sup>-1</sup>. The CS binder with its three-dimensional structure has the highest ionic conductivity of 2.29 × 10<sup>-4</sup> S cm<sup>-1</sup>, a lower R<sub>ct</sub>, good cycling stability with a capacity retention of 84.3 % after 5000 cycles at 200 mV s<sup>-1</sup>, and excellent rate performance of 85.6 %. It can provide a practical application in supercapacitors.</div></div>","PeriodicalId":305,"journal":{"name":"Electrochimica Acta","volume":"510 ","pages":"Article 145345"},"PeriodicalIF":5.5000,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Biopolymers as three-dimensional structural binders for nickel-cobalt sulfide supercapacitor electrodes\",\"authors\":\"Jiamei Li , Zhe Chen , Fuqiang Chen , Zhijin Zhu , Tongwei Shen , Yunxiang Chen , Yaliang Chen , Yanqun Shao\",\"doi\":\"10.1016/j.electacta.2024.145345\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Ion diffusion and electron transfer are hindered by commonly used hydrophobic binders, which directly affect the electrochemical performance of the electrodes. Hydrophilic binders are selected to efficaciously solve the problem of relatively low actual specific capacitance and rate performance in the field of nickel cobalt sulfide electrode materials. In the paper, RuCoNiS electrodes were prepared using polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), xanthan gum (XG), and chitosan (CS) as binders. The surface wettability, morphological structure, specific surface area, and electrochemical performance of electrodes with different binders were analyzed by XRD, SEM, BET, CV, GCD, and EIS, etc. It's shown that the synthesis of CoNi<sub>2</sub>S is confirmed by XRD. The XPS results verify the existence of RuO<sub>2</sub> and Ni<sup>2+</sup>/Ni<sup>3+</sup> and Co<sup>2+</sup>/Co<sup>3+</sup> redox couples. A cross-linked network structure is formed on the surface of the RuCoNiS by CS. The CS-RuCoNiS electrode has the largest specific surface area and microporosity. Ion migration in the electrolyte is facilitated by the excellent wettability of the CS-RuCoNiS electrode. The CS-RuCoNiS electrode reachs 1193.52 F g<sup>-1</sup>, which is 1.74 times higher than that of the PTFE-RuCoNiS electrode at 1 A g<sup>-1</sup>. The CS binder with its three-dimensional structure has the highest ionic conductivity of 2.29 × 10<sup>-4</sup> S cm<sup>-1</sup>, a lower R<sub>ct</sub>, good cycling stability with a capacity retention of 84.3 % after 5000 cycles at 200 mV s<sup>-1</sup>, and excellent rate performance of 85.6 %. It can provide a practical application in supercapacitors.</div></div>\",\"PeriodicalId\":305,\"journal\":{\"name\":\"Electrochimica Acta\",\"volume\":\"510 \",\"pages\":\"Article 145345\"},\"PeriodicalIF\":5.5000,\"publicationDate\":\"2024-11-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Electrochimica Acta\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0013468624015810\",\"RegionNum\":3,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ELECTROCHEMISTRY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Electrochimica Acta","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013468624015810","RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ELECTROCHEMISTRY","Score":null,"Total":0}
Biopolymers as three-dimensional structural binders for nickel-cobalt sulfide supercapacitor electrodes
Ion diffusion and electron transfer are hindered by commonly used hydrophobic binders, which directly affect the electrochemical performance of the electrodes. Hydrophilic binders are selected to efficaciously solve the problem of relatively low actual specific capacitance and rate performance in the field of nickel cobalt sulfide electrode materials. In the paper, RuCoNiS electrodes were prepared using polytetrafluoroethylene (PTFE), carboxymethyl cellulose (CMC), xanthan gum (XG), and chitosan (CS) as binders. The surface wettability, morphological structure, specific surface area, and electrochemical performance of electrodes with different binders were analyzed by XRD, SEM, BET, CV, GCD, and EIS, etc. It's shown that the synthesis of CoNi2S is confirmed by XRD. The XPS results verify the existence of RuO2 and Ni2+/Ni3+ and Co2+/Co3+ redox couples. A cross-linked network structure is formed on the surface of the RuCoNiS by CS. The CS-RuCoNiS electrode has the largest specific surface area and microporosity. Ion migration in the electrolyte is facilitated by the excellent wettability of the CS-RuCoNiS electrode. The CS-RuCoNiS electrode reachs 1193.52 F g-1, which is 1.74 times higher than that of the PTFE-RuCoNiS electrode at 1 A g-1. The CS binder with its three-dimensional structure has the highest ionic conductivity of 2.29 × 10-4 S cm-1, a lower Rct, good cycling stability with a capacity retention of 84.3 % after 5000 cycles at 200 mV s-1, and excellent rate performance of 85.6 %. It can provide a practical application in supercapacitors.
期刊介绍:
Electrochimica Acta is an international journal. It is intended for the publication of both original work and reviews in the field of electrochemistry. Electrochemistry should be interpreted to mean any of the research fields covered by the Divisions of the International Society of Electrochemistry listed below, as well as emerging scientific domains covered by ISE New Topics Committee.