Insights into oxygen reduction reaction on pristine carbon nanoparticles synthesized by the plasma-in-liquid process
Insights into oxygen reduction reaction on pristine carbon nanoparticles synthesized by the plasma-in-liquid process
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DOI：
10.1016/j.electacta.2021.138882
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发表时间：
2021-09
影响因子：
6.6
通讯作者：
Hanvin Kim;N. Takeuchi
中科院分区：
文献类型：
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作者：
Hanvin Kim;N. Takeuchi
碳基材料作为替代贵金属催化剂的新型能源转换材料已被广泛研究。此外，液体中等离子体工艺最近已用于合成用于氧还原反应的杂原子掺杂的碳材料，例如氮掺杂、硼掺杂和卤素掺杂的碳。然而，人们一直缺乏对原始碳的了解，这是这种反应的基础材料。在这项研究中，原始碳材料（Cx-P）的合成使用等离子体在液体中的过程中，和材料的性能和氧还原反应（ORR）的性能进行了分析，相对于热处理。Cx-P被成功地合成为碳纳米颗粒，并通过热处理被重新设计为具有各种孔径分布的部分结晶碳。2-电子转移ORR途径被确定为内在还原途径。另一方面，电化学活性随着热处理而增加，显示出出乎意料的约18.30 mA cm−2的优异上级动力学电流密度（在0.5 V vs. RHE下）。我们的研究结果有望为相关碳材料的ORR性能提供重要参考，包括对使用等离子体液相工艺合成的部分结晶多孔碳的基本材料性质的见解。
Carbon-based materials have been widely studied as promising energy conversion materials that can replace noble metal catalysts. In addition, the plasma-in-liquid process has recently been used to synthesize heteroatom-doped carbon materials for oxygen reduction reactions, such as nitrogen-, boron-, and halogen-doped carbon. However, there has been a lack of insight into pristine carbon, which is the base material for such reactions. In this study, pristine carbon materials (Cx-P) were synthesized using a plasma-in-liquid process, and the material properties and oxygen reduction reaction (ORR) performance were analyzed with respect to heat treatment. Cx-P was successfully synthesized as a carbon nanoparticle and redesigned as partially crystallized carbon with various pore-size distributions using heat treatment. The 2-electron-transfer ORR pathway was identified as the intrinsic reduction route. On the other hand, the electrochemical activity increased with heat treatment, showing an unexpectedly superior kinetic current density of ~18.30 mA cm−2(at 0.5 V vs. RHE). Our results are expected to provide an important reference to the ORR performance of the relevant carbon materials, including insights into the basic material properties of partially crystallized porous carbon synthesized using the plasma-in-liquid process.