Porous Nitrogen‐doped Reduced Graphene Oxide Gels as Efficient Supercapacitor Electrodes and Oxygen Reduction Reaction Electrocatalysts,Chinese Journal of Chemistry

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Porous Nitrogen‐doped Reduced Graphene Oxide Gels as Efficient Supercapacitor Electrodes and Oxygen Reduction Reaction Electrocatalysts
Chinese Journal of Chemistry ( IF 5.5 ) Pub Date : 2020-03-29 , DOI: 10.1002/cjoc.201900482
Liu Yang ₁ , Tao Wang ₁ , Dongling Wu ₁

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Heteroatom‐doped carbon materials have been widely used in energy storage and conversion such as supercapacitors and electrocatalysts. In this work, L‐asparagine (Asn), an amino acid derivative, has been used as a doping agent to prepare nitrogen‐ doped reduced graphene oxide gels (N‐GAs). The 3D interconnected structure gives rise to the superior electrochemical properties for supercapacitor and electrocatalytic oxygen reduction reaction (ORR). The N‐GA‐4 (the mass ratio of Asn to graphene oxide (GO) is 4 : 1 by hydrothermal method) electrode shows the capacitance of 291.6 F·g^–1 at 0.5 A·g^–1. Meanwhile, the assembled symmetric supercapacitor achieves a maximum energy density of 23.8 Wh· kg^–1 when the power density is 451.2 W·kg^–1, and demonstrates an ultralong cycling life that the retention of capacitance is 99.3% after 80000 cycles. What's more, the annealed aerogel N‐GA‐4‐900 exhibits an onset potential (E_onset) of 0.95 V, half wave potential (E_1/2) of 0.84 V (vs. RHE) and the oxygen reduction current density of 5.5 mA·cm^–2 at 0.1 V with nearly four‐electron transfer, which are superior to commercial Pt/C. This work offers a new insight into the synthesis and applications of N‐GAs materials towards high performance in supercapacitors and ORR.

中文翻译：

氮掺杂多孔还原氧化石墨烯凝胶作为高效超级电容器电极和氧还原反应电催化剂

掺杂杂原子的碳材料已广泛用于能量存储和转换，例如超级电容器和电催化剂。在这项工作中，氨基酸衍生物L-天冬酰胺（Asn）被用作掺杂剂来制备氮掺杂的还原氧化石墨烯凝胶（N-GAs）。3D互连结构为超级电容器和电催化氧还原反应（ORR）带来了卓越的电化学性能。的N GA-4（天冬酰胺的石墨烯氧化物的质量比（GO）为4：1的水热法）电极节目291.6 F中的电容·克^-1 0.5 A·克^-1。同时，当功率密度为451.2 W·kg时，组装好的对称超级电容器的最大能量密度为23.8 Wh·kg ^–1^–1，并展示了超长的循环寿命，在8万次循环后，电容保持率为99.3％。更重要的是，所述退火气凝胶的N- GA-4-900表现出开始电位（Ë_发病为0.95V的），半波电势（Ë _1/2 0.84 V（vs.RHE）下和5.5的氧还原电流密度的）0.1 V时的mA·cm ^–2，几乎有四电子传递，优于商用Pt / C。这项工作为N-GAs材料的合成和应用提供了新的见解，以实现超级电容器和ORR中的高性能。

更新日期：2020-03-29

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