Porous nitrogen-doped carbon nanosheets composite Fe3C synthesized by molten salt-mediated template method as efficient ORR catalyst for zinc-air batteries

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2024-09-06 DOI:10.1007/s42823-024-00802-5

Qing Long, Qianqi Wu, Zhiming Wen, Wei Wang, Chen Li, Huichuan Tang, Haitao Wang, Junlin Huang, Liang Chen, Gangyong Li, Wenyuan Xu

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Abstract

Considering the intrinsic activity of non-precious metal oxygen reduction reaction (ORR) catalysts is typically lower than that of precious metal catalysts, it is crucial to focus on the rational design of their micro-morphology and active site. This paper employed a simple molten salt-mediated template method to fabricate a Fe₃C composite N-doped C catalyst with a layered porous framework (Fe₃C@NC). Tannic acid was utilized to form a strong coordination with iron to limit the grain size of Fe₃C nanocrystals generated by high-temperature pyrolysis. Moreover, urea achieved nitrogen doping in tannic acid-derived porous carbon, while the graphite phase nitrogen-doped carbon (g-C₃N₄) formed by its pyrolysis, together with the molten salt-mediated environment, jointly controlled the two-dimensional sheet-like structure of the material. The optimized Fe₃C@NC-800 demonstrated efficient ORR performance, with an ORR half-wave potential of 0.883 V. Its application as a cathode catalyst in a liquid zinc-air battery (ZABs) exhibits a maximum power density of 211.5 mW cm⁻², surpassing that of a Pt/C-based ZAB and indicating the potential practical utility of this material.

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熔盐介导模板法合成的多孔掺氮碳纳米片复合 Fe3C 作为锌-空气电池的高效 ORR 催化剂

考虑到非贵金属氧还原反应（ORR）催化剂的内在活性通常低于贵金属催化剂，因此关注其微形态和活性位点的合理设计至关重要。本文采用简单的熔盐介导模板法制备了一种具有层状多孔框架（Fe3C@NC）的 Fe3C 复合 N 掺杂 C 催化剂。利用单宁酸与铁形成强配位，限制了高温热解产生的 Fe3C 纳米晶体的粒径。此外，尿素在单宁酸衍生的多孔碳中实现了氮掺杂，而其热解形成的石墨相氮掺杂碳（g-C3N4）与熔盐介导的环境共同控制了材料的二维片状结构。优化后的 Fe3C@NC-800 具有高效的 ORR 性能，其 ORR 半波电位为 0.883 V。将其用作液态锌-空气电池（ZABs）的阴极催化剂可获得 211.5 mW cm-2 的最大功率密度，超过了基于 Pt/C 的 ZAB，这表明该材料具有潜在的实用价值。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.