Nitrogen-doped hollow carbon nanoflowers from a preformed covalent triazine framework for metal-free bifunctional electrocatalysis.,Nanoscale

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Nitrogen-doped hollow carbon nanoflowers from a preformed covalent triazine framework for metal-free bifunctional electrocatalysis.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-18 , DOI: 10.1039/d0nr04346j
Yong Zheng ₁ , Shan Chen , Hui Song , Hele Guo , Kai A I Zhang , Chao Zhang , Tianxi Liu

Affiliation

Fabrication of nitrogen-doped hollow carbon nanostructures is of great importance for achieving efficient electron and ion transport as a metal-free electrocatalyst. Herein, we report a step-wise polymerization and carbonization route to prepare N-doped hollow carbon nanoflowers (N-HCNFs) with a high nitrogen content up to 5.3 at%. A preformed covalent triazine framework (CTF) network assembled on a melamine-cyanuric acid (MCA) supermolecular crystal was achieved via a step-wise polymerization. The subsequent carbonization was conducted to obtain hollow and porous carbon materials with a unique flower-shape. Excellent electrochemical oxygen reduction reaction (ORR) performance with a positive half-wave potential of 0.84 V (vs. RHE) was achieved with excellent stability and methanol resistance in alkaline media. Furthermore, for the hydrogen evolution reaction (HER), a low overpotential of 243 mV at a current density of 10 mA cm⁻² and a small Tafel slope of 111 mV dec⁻¹ in acidic media were shown.

中文翻译：

来自预先形成的共价三嗪骨架的氮掺杂空心碳纳米花，用于无金属的双功能电催化。

氮掺杂空心碳纳米结构的制造对于作为无金属的电催化剂实现有效的电子和离子传输非常重要。在这里，我们报告了逐步聚合和碳化的路线，以制备氮含量高达5.3 at％的N掺杂空心碳纳米花（N-HCNFs）。通过逐步聚合，在三聚氰胺-氰尿酸（MCA）超分子晶体上组装了预先形成的共价三嗪骨架（CTF）网络。进行随后的碳化以获得具有独特花形的中空和多孔碳材料。出色的电化学氧还原反应（ORR）性能，正半波电势为0.84 V（vs.RHE）在碱性介质中具有出色的稳定性和耐甲醇性。此外，对于氢析出反应（HER），显示了在酸性介质中在10mA cm ^-2的电流密度下的243mV的低过电位和在111mV dec ^-1的小Tafel斜率。

更新日期：2020-07-16

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