Carbon fiber (CF) prevails as a cutting-edge material, however, considerable waste gases produced in its production place a tremendous burden on the industry and environment. Our previous study proposed a “two-birds-one-stone” strategy to simultaneously convert the gaseous effluents into carbon nanotubes (CNT) and produce multifunctional CNT@CF materials. However, the challenges in the management of iron nanocatalysts and the containment of side effects on the performance of CF composites have significantly affected the scalability of this technique. In the present work, we developed a further comprehensive understanding of cobalt and nickel-based metallic CFs as new catalysts to obtain more controlled and effective catalytic properties and subsequently extend the better performance of CF composite. In-situ capture and solidification of gases generated from the carbonization step of CF production process created more novel CNTs in the tip- and base-growth model. The CNTs with tip-growth model exhibited a better enhancement effect than the base-growth model on the interfacial properties of composites with up to 57% and 54% improvement in interfacial and inter-laminar shear strength, respectively. Moreover, new insights regarding the evolution mechanism of CNTs were provided through qualitative and quantitative analysis of the gas emissions reduction and recycling efficiency, supported by density functional theory. In this work, more available practical parameters governing the catalytic properties of metallic CF provide additional efficiency of gas waste recovery, diversity of CNTs, and potential for emerging applications, which delivers a more comprehensive guarantee for the implementation of this technology on the CF production line in the next step.

碳纤维（CF）作为一种前沿材料而盛行，但其生产过程中产生的大量废气对工业和环境造成了巨大的负担。我们之前的研究提出了一种“双鸟同石”策略，可同时将气态流出物转化为碳纳米管（CNT）并生产多功能 CNT@CF 材料。然而，铁纳米催化剂管理方面的挑战以及对 CF 复合材料性能的副作用的控制显着影响了该技术的可扩展性。在目前的工作中，我们对钴基和镍基金属碳纤维作为新催化剂有了更全面的了解，以获得更可控和更有效的催化性能，并随后扩展碳纤维复合材料的更好性能。CF 生产过程中碳化步骤产生的气体的原位捕获和凝固在尖端和底部生长模型中创造了更多新型 CNT。尖端生长模型的碳纳米管比基部生长模型对复合材料的界面性能表现出更好的增强效果，界面和层间剪切强度分别提高了 57% 和 54%。此外，在密度泛函理论的支持下，通过对气体减排和回收效率的定性和定量分析，提供了关于碳纳米管演化机制的新见解。在这项工作中，更多可用的控制金属 CF 催化性能的实用参数提供了气体废物回收的额外效率、CNT 的多样性和新兴应用的潜力，