Lv Dongxue, Yin Duanduan, Yang Ying, Shao Hong, Li Dan, Wang Tianqi, Ma Qianli, Li Feng, Yu Wensheng, Han Ce, Dong Xiangting
Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, Jilin, China.
Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, Jilin, China.
J Colloid Interface Sci. 2024 Jun;663:270-279. doi: 10.1016/j.jcis.2024.02.162. Epub 2024 Feb 21.
A new type of self-supporting multi-channel Janus carbon fibers with efficient water splitting has been successfully manufactured using a specially designed parallel spinneret through electrospinning technology and subsequent carbonization technique. Every single Janus fiber composes of a half side of MoC and the other half side of Ni components as MoC, Ni embedded in N-doped multi-channel Janus carbon fibers ([MoC/C]//[Ni/C]-NMCFs) for overall water splitting. Under optimized condition, the hydrogen evolution reaction overpotential of [MoC/C]//[Ni/C]-NMCFs (62 mV) is just 24 mV higher than 20 wt% Pt/C (38 mV) at a current density of 10 mA cm. Furthermore, it achieves current density of 10 mA cm to require an overpotential of 324 mV for oxygen evolution reaction. Additionally, the cell assembled by the identical [MoC/C]//[Ni/C]-NMCFs catalyst as both the cathode and anode needs only 1.607 V at a current density of 10 mA cm, which is only 0.022 V higher than that of Pt/C-IrO electrodes. Moreover, [MoC/C]//[Ni/C]-NMCFs catalyst also exhibits a long-term stability. The synergistic effect and unique heterostructure of MoC and Ni enhance the catalytic activity.
通过静电纺丝技术和后续碳化技术，使用专门设计的平行喷丝头成功制造出一种新型的具有高效水分解性能的自支撑多通道Janus碳纤维。每根Janus纤维由MoC的一半和Ni组分的另一半组成，即MoC、Ni嵌入N掺杂的多通道Janus碳纤维（[MoC/C]//[Ni/C]-NMCFs）中用于整体水分解。在优化条件下，[MoC/C]//[Ni/C]-NMCFs在电流密度为10 mA cm时的析氢反应过电位（62 mV）仅比20 wt% Pt/C（38 mV）高24 mV。此外，其析氧反应达到10 mA cm的电流密度需要324 mV的过电位。此外，由相同的[MoC/C]//[Ni/C]-NMCFs催化剂作为阴极和阳极组装的电池在电流密度为10 mA cm时仅需1.607 V，仅比Pt/C-IrO电极高0.022 V。此外，[MoC/C]//[Ni/C]-NMCFs催化剂还表现出长期稳定性。MoC和Ni的协同效应和独特的异质结构增强了催化活性。
