Facile preparation of nitrogen-doped graphene as an efficient oxygen reduction electrocatalyst,Inorganic Chemistry Frontiers

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Facile preparation of nitrogen-doped graphene as an efficient oxygen reduction electrocatalyst
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2017-07-28 00:00:00 , DOI: 10.1039/c7qi00387k
Xiaochun Gao _{1,

2,

3,

4,

5} , Liwei Wang _{1,

2,

3,

4,

5} , Jizhen Ma _{1,

2,

3,

4,

5} , Yueqing Wang _{1,

2,

3,

4,

5} , Jintao Zhang _{1,

2,

3,

4,

5}

Affiliation

The development of highly efficient and low cost electrocatalysts for the oxygen reduction reaction (ORR) is crucial for metal–air batteries and fuel cells. Herein, an acid-assisted approach has been developed to prepare nitrogen-doped graphene electrocatalysts via the co-precipitation of graphene oxide (GO) and melamine in the presence of various inorganic acids (e.g., HNO₃, H₂SO₄, and H₃PO₄), and a subsequent pyrolysis process. When used as an electrocatalyst, the nitrogen doped graphene prepared in the presence of nitric acid exhibited the best catalytic activity towards the ORR by a four-electron pathway with the largest current density (∼5.5 mA cm⁻²) and the highest onset potential (∼0.90 V vs. RHE) in comparison with the samples prepared in the presence of sulfuric acid and phosphate acid. Being a corrosive and oxidizing acid, nitric acid is likely to promote the formation of surface defects and pyridinic nitrogen under the thermal treatment, thus improving the electrocatalytic activity. More importantly, Zn–air batteries were fabricated by using the as-prepared electrocatalysts in the air electrode, exhibiting high power density and good long-term stability. This facile acid-assisted approach provides a new strategy to synthesize low-cost yet highly efficient heteroatom doped carbon electrocatalysts for the ORR.

中文翻译：

简便地制备氮掺杂石墨烯作为有效的氧还原电催化剂

氧还原反应（ORR）的高效，低成本电催化剂的开发对于金属空气电池和燃料电池至关重要。本文中，已经开发了一种酸辅助方法，以在各种无机酸（例如HNO ₃，H ₂ SO ₄和H ）存在下，通过氧化石墨烯（GO）和三聚氰胺的共沉淀来制备氮掺杂的石墨烯电催化剂。₃ PO ₄），以及随后的热解过程。当用作电催化剂时，在硝酸存在下制备的氮掺杂石墨烯通过最大电流密度（约5.5 mA cm）的四电子途径对ORR表现出最佳的催化活性。与在硫酸和磷酸存在下制备的样品相比，具有最高的起始电位（相对于RHE为-0.90 V）和^-2）。硝酸是一种腐蚀性和氧化性酸，在热处理后可能会促进表面缺陷和吡啶氮的形成，从而提高电催化活性。更重要的是，锌-空气电池是通过在空气电极中使用准备好的电催化剂制造的，具有高功率密度和良好的长期稳定性。这种简便的酸辅助方法提供了一种新的策略，可以为ORR合成低成本但高效的杂原子掺杂碳电催化剂。

更新日期：2017-08-14

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