Xia Chen, Jingyu Guan, Yong Zheng, Yi Shen, Ruifeng Chen, Niu Huang, Binbin Jia, Xin Ying Kong, Yan Yan, Mingkai Liu, Liqun Ye
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引用次数: 0
摘要
三维组装碳材料具有独特的分层多孔性和相互连接的通道,对于新兴锌空气电池(ZAB)的发展至关重要。在本研究中,通过先自组装再碳化的简单程序合成了氮(N)和硫(S)共掺杂三维碳纳米孔(N/S-CNHs)。该过程利用自组装共价三嗪框架和木质素磺酸钠(CTF@LS)的混合体作为多功能前体。由此产生的 N/S-CNHs 具有独特的纳米孔微结构,由交织的碳纳米团簇组成,有利于电催化过程中离子和电子的高效传输。N 原子和 S 原子的加入有趣地改变了催化剂微环境的润湿特性,从而极大地促进了关键中间产物的传输及其与电解质的相互作用。因此,优化后的 N/S-CNH-900 在 ORR 中表现出显著的电催化活性(E1/2 = 0.86 V vs RHE),超过了最先进的 Pt/C 电催化剂的性能。理论计算显示,N 和 S 杂原子掺杂的协同效应显著增强了 *OOH 的解吸及其向 O* 的转化,从而明显加速了 ORR 过程。此外,与采用商用 Pt/C 催化剂的 ZABs 相比,配备 N/S-CNH-900 阴极的液态和准固态 ZABs 的峰值功率密度和比容量都有所提高。
Self-Assembled Covalent Triazine Frameworks Derived N, S Co-Doped Carbon Nanoholes with Facilitating Ions Transportation Toward Remarkably Enhanced Oxygen Reduction Reaction and for Zinc–Air Batteries
3D assembled carbon materials, featuring unique hierarchical porosity and interconnected channels, are essential for the advancement of emerging zinc–air batteries (ZABs). In this study, nitrogen (N) and sulfur (S) co-doped 3D carbon nanoholes (N/S-CNHs) are synthesized through a straightforward procedure involving self-assembly followed by carbonization. This process utilizes a hybrid of self-assembled covalent triazine framework and sodium lignosulphonate (CTF@LS) as a multifunctional precursor. The resulting N/S-CNHs exhibit a distinctive nanoholes microstructure composed of interwoven carbon nanoclusters, which facilitates efficient ion and electron transport during the electrocatalytic process. The incorporation of N and S atoms intriguingly alters the wetting properties of the catalyst microenvironment, thereby significantly facilitating the transfer of key intermediates and their interaction with the electrolyte. Consequently, the optimized N/S-CNH-900 demonstrates remarkable electrocatalytic activity for the ORR (E1/2 = 0.86 V vs RHE), surpassing the performance of state-of-the-art Pt/C electrocatalyst. Theoretical calculations reveal that the synergistic effect of N and S heteroatom doping significantly enhances *OOH desorption and its transformation to O*, thereby markedly accelerating the ORR process. Furthermore, both liquid and quasi-solid ZABs equipped with the N/S-CNH-900 cathode exhibit improved peak power density and specific capacity relative to those employing commercial Pt/C catalysts.
期刊介绍:
Small serves as an exceptional platform for both experimental and theoretical studies in fundamental and applied interdisciplinary research at the nano- and microscale. The journal offers a compelling mix of peer-reviewed Research Articles, Reviews, Perspectives, and Comments.
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