Gelatin-derived carbon: Carbonization mechanism and application in K-ion storage
Gelatin-derived carbon: Carbonization mechanism and application in K-ion storage
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DOI：
10.1016/j.carbon.2021.03.059
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发表时间：
2021-04
期刊：
影响因子：
10.9
通讯作者：
Na Yang;Rong Shao;Zhengping Zhang;M. Dou;J. Niu;Feng Wang
中科院分区：
文献类型：
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作者：
Na Yang;Rong Shao;Zhengping Zhang;M. Dou;J. Niu;Feng Wang
明胶是胶原蛋白水解形成的天然高分子物质，具有资源丰富、成本低廉的优点。它是合成N、O掺杂碳材料的良好前驱体。尽管一些明胶衍生的碳材料已用于电化学储能，但对于明胶碳化机理的研究还很少。此外，杂原子和缺陷对钾离子存储性能的影响仍不清楚。在这项工作中，采用原位和非原位表征方法来研究明胶碳化的机理。明胶基碳在热解过程中形成碳骨架、杂原子掺杂和缺陷产生的途径已被明确识别。此外，通过DFT计算和实验测量，证实杂原子和缺陷对于提高钾离子的存储性能都发挥着重要作用。凭借丰富的杂原子和缺陷，我们优化的阳极表现出比石墨阳极更好的电化学性能。该研究不仅阐明了我们对碳材料碳化机理和K离子存储机理的认识，而且为碱离子电池新型碳基负极材料的合成和应用提供了途径。
Gelatin, a natural macromolecular substance formed by the hydrolysis of collagen, offers the advantages of abundant resources and low cost. It is a good precursor for the synthesis of N, O-doped carbon materials. Although some gelatin-derived carbon materials have been used for electrochemical energy storage, there have been few studies for the mechanism of gelatin carbonization. In addition, the influence of heteroatoms and defects on the K-ion storage performance remains unclear. In this work, in situ and ex situ characterization methods have been used to study the mechanism of gelatin carbonization. The pathways leading to formation of the carbon framework, heteroatom doping and defect generation in gelatin-based carbons during the pyrolysis process have been clearly identified. Moreover, by means of DFT calculations and experimental measurements, it has been confirmed that heteroatoms and defects both play important roles in improving the storage performance of potassium ions. By virtue of its abundance of both heteroatoms and defects, our optimized anode shows better electrochemical performance than graphite anodes. This study not only clarifies our understanding of carbonization mechanism and mechanism of K-ion storage in carbon materials, but also provides pathways for the synthesis and applications of new carbon-based anode materials for alkali-ion batteries.