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N-Doped Pitch Assisted Local Interface Micro-Environment Tailoring and Microcrystalline Regulation in Carbon Nanotube for Efficient Oxygen Reduction Reaction

Jian Li,Wenhao Chen,Xinxin Pi, Zhenjia Liu, Xiequn Song, Kezhi Yang,Yanhui Li

Fuel(2024)

Qingdao Univ

Cited 0|Views8
Abstract
Regulating the atomic micro-environment at active sites and the interfaces between carbon nanoparticles is crucial for enhancing the performance of carbon-based metal-free electrocatalysts. Herein, a novel carbon nanocomposite, nitrogen-doped coal tar pitch composite carbon nanotubes (NPC@CNTs) was proposed, along with the potential synergistic mechanisms at its heterojunction interfaces. The innovative synthesis involves encapsulating carbon nanotubes (CNTs) within coal tar pitch (CTP), followed by nitrogen doping and CO2 activation to form a layered nano-microstructure with hierarchical porosity. This configuration allows for the precise modulation of the atomic environment at the graphitic-N sites within the heterostructure, with the interfacial effects significantly promoting efficient electron transfer and mass transport. The NPC@CNTs exhibit high E-onset (0.991 V verse Reversible Hydrogen Electrode) and Ehalf-wave (0.845 V vs RHE) in alkaline solution. with an OER overpotential of 391 mV at 10 mA cm(-2). Furthermore, a Zn-air battery employing NPC@CNTs indicates a peak power density of 91 mW cm(-2) with sustained stability over 230 h. Density Functional Theory (DFT) calculations confirmed the heterostructure of graphitic nitrogen-doped CNTs provides a higher density of active sites and more efficient charge transfer at carbon atoms adjacent to nitrogen. The CNTs with functionalized shell-interface has significant potential for bifunctional catalysis, surpassing most heteroatom-doped nanocarbon catalysts and commercial Pt/C (20 %).
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Carbon-based electrocatalyst,Micro-environment tailoring,Microcrystalline regulation,Oxygen reduction reaction,Oxygen evolution reaction
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要点】:本文提出了一种氮掺杂的焦油沥青辅助调控碳纳米管局部界面微环境的新策略,以实现高效的氧还原反应性能。

方法】:通过将碳纳米管封装在焦油沥青中,进行氮掺杂和CO2活化,制备出具有分层多孔结构的氮掺杂焦油沥青复合碳纳米管(NPC@CNTs)。

实验】:在碱性溶液中,NPC@CNTs表现出高的起始电位(0.991 V vs RHE)和半波电位(0.845 V vs RHE),在10 mA cm(-2)的电流密度下氧还原反应的过电位为391 mV。此外,采用NPC@CNTs的锌空气电池显示出91 mW cm(-2)的峰值功率密度,并在230小时内保持稳定。通过密度泛函理论(DFT)计算确认了石墨氮掺杂CNTs异质结构提供了更高密度的活性位点以及更高效的电荷转移。实验数据集未明确提及。