Yong Liu, Yumei Chen, Qing Li, Jianchao Shi, Baozhong Liu
{"title":"同步掺氮 Ketjenblack 碳支持的 Co/CoxOy 纳米薄膜对氧还原反应的电催化作用。","authors":"Yong Liu, Yumei Chen, Qing Li, Jianchao Shi, Baozhong Liu","doi":"10.1016/j.jcis.2024.09.235","DOIUrl":null,"url":null,"abstract":"<p><p>Developing a highly active and stable non-precious metal catalyst for oxygen reduction reaction (ORR) is of great practical significance for advancing fuel cell technology. In this work, a continuous two-step hydrothermal reaction followed by high temperature pyrolysis were employed to achieve in situ N-doping preferentially into Ketjenblack carbon (KB-N) and composite of KB-N and Co/Co<sub>x</sub>O<sub>y</sub> nanofilms (Co/Co<sub>x</sub>O<sub>y</sub>-NFs) as Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N. The N-doped state strongly affects the ORR activity of catalyst. All prepared Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalysts exhibit observably improved ORR activity compared with the basal KB-N and N-doped Co/Co<sub>x</sub>O<sub>y</sub>-NFs, in which the optimal Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst demonstrate the positive E<sub>onset</sub> (0.864 V) and E<sub>1/2</sub> (0.788 V) vs. RHE, the low Tafel slope (69.27 mV dec<sup>-1</sup>), implying quick ORR kinetics. And, the Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst exhibits highly electrochemical durability. The KB-N substrate can purify Co valence in CoO component, promote amorphization of CoO crystalline structure and enhance the interaction between Co/Co<sub>x</sub>O<sub>y</sub>-NFs and KB-N in Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst. Thus electronic effect, structural effect and synergistic effect can strengthen O<sub>2</sub> adsorption, provide enough adsorbed sites and accelerate electron transfer, resulting in prominent ORR performance of Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst.</p>","PeriodicalId":351,"journal":{"name":"Journal of Colloid and Interface Science","volume":null,"pages":null},"PeriodicalIF":9.4000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Electrocatalysis of Co/Co<sub>x</sub>O<sub>y</sub> nanofilms supported by synchronously nitrogen-doped Ketjenblack carbon towards oxygen reduction reaction.\",\"authors\":\"Yong Liu, Yumei Chen, Qing Li, Jianchao Shi, Baozhong Liu\",\"doi\":\"10.1016/j.jcis.2024.09.235\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Developing a highly active and stable non-precious metal catalyst for oxygen reduction reaction (ORR) is of great practical significance for advancing fuel cell technology. In this work, a continuous two-step hydrothermal reaction followed by high temperature pyrolysis were employed to achieve in situ N-doping preferentially into Ketjenblack carbon (KB-N) and composite of KB-N and Co/Co<sub>x</sub>O<sub>y</sub> nanofilms (Co/Co<sub>x</sub>O<sub>y</sub>-NFs) as Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N. The N-doped state strongly affects the ORR activity of catalyst. All prepared Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalysts exhibit observably improved ORR activity compared with the basal KB-N and N-doped Co/Co<sub>x</sub>O<sub>y</sub>-NFs, in which the optimal Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst demonstrate the positive E<sub>onset</sub> (0.864 V) and E<sub>1/2</sub> (0.788 V) vs. RHE, the low Tafel slope (69.27 mV dec<sup>-1</sup>), implying quick ORR kinetics. And, the Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst exhibits highly electrochemical durability. The KB-N substrate can purify Co valence in CoO component, promote amorphization of CoO crystalline structure and enhance the interaction between Co/Co<sub>x</sub>O<sub>y</sub>-NFs and KB-N in Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst. Thus electronic effect, structural effect and synergistic effect can strengthen O<sub>2</sub> adsorption, provide enough adsorbed sites and accelerate electron transfer, resulting in prominent ORR performance of Co/Co<sub>x</sub>O<sub>y</sub>-NFs@KB-N catalyst.</p>\",\"PeriodicalId\":351,\"journal\":{\"name\":\"Journal of Colloid and Interface Science\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":9.4000,\"publicationDate\":\"2024-10-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Colloid and Interface Science\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://doi.org/10.1016/j.jcis.2024.09.235\",\"RegionNum\":1,\"RegionCategory\":\"化学\",\"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 Colloid and Interface Science","FirstCategoryId":"92","ListUrlMain":"https://doi.org/10.1016/j.jcis.2024.09.235","RegionNum":1,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Electrocatalysis of Co/CoxOy nanofilms supported by synchronously nitrogen-doped Ketjenblack carbon towards oxygen reduction reaction.
Developing a highly active and stable non-precious metal catalyst for oxygen reduction reaction (ORR) is of great practical significance for advancing fuel cell technology. In this work, a continuous two-step hydrothermal reaction followed by high temperature pyrolysis were employed to achieve in situ N-doping preferentially into Ketjenblack carbon (KB-N) and composite of KB-N and Co/CoxOy nanofilms (Co/CoxOy-NFs) as Co/CoxOy-NFs@KB-N. The N-doped state strongly affects the ORR activity of catalyst. All prepared Co/CoxOy-NFs@KB-N catalysts exhibit observably improved ORR activity compared with the basal KB-N and N-doped Co/CoxOy-NFs, in which the optimal Co/CoxOy-NFs@KB-N catalyst demonstrate the positive Eonset (0.864 V) and E1/2 (0.788 V) vs. RHE, the low Tafel slope (69.27 mV dec-1), implying quick ORR kinetics. And, the Co/CoxOy-NFs@KB-N catalyst exhibits highly electrochemical durability. The KB-N substrate can purify Co valence in CoO component, promote amorphization of CoO crystalline structure and enhance the interaction between Co/CoxOy-NFs and KB-N in Co/CoxOy-NFs@KB-N catalyst. Thus electronic effect, structural effect and synergistic effect can strengthen O2 adsorption, provide enough adsorbed sites and accelerate electron transfer, resulting in prominent ORR performance of Co/CoxOy-NFs@KB-N catalyst.
期刊介绍：
The Journal of Colloid and Interface Science publishes original research findings on the fundamental principles of colloid and interface science, as well as innovative applications in various fields. The criteria for publication include impact, quality, novelty, and originality.
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The journal emphasizes fundamental scientific innovation within the following categories:
A.Colloidal Materials and Nanomaterials
B.Soft Colloidal and Self-Assembly Systems
C.Adsorption, Catalysis, and Electrochemistry
D.Interfacial Processes, Capillarity, and Wetting
E.Biomaterials and Nanomedicine
F.Energy Conversion and Storage, and Environmental Technologies
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