Nitrogen-doped, oxygen-functionalized, edge- and defect-rich vertically aligned graphene for highly enhanced oxygen evolution reaction†,Journal of Materials Chemistry A

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Nitrogen-doped, oxygen-functionalized, edge- and defect-rich vertically aligned graphene for highly enhanced oxygen evolution reaction†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2018-01-01 00:00:00 , DOI: 10.1039/c7ta07896j
Dongqi Li _{1,

2,

3,

4,

5} , Bowen Ren _{1,

2,

3,

4,

5} , Qiuyan Jin _{1,

2,

3,

4,

5} , Hao Cui _{1,

2,

3,

4,

5} , Chengxin Wang _{1,

2,

3,

4,

5}

Affiliation

Graphene-based electrocatalysts have been extensively developed as a metal-free alternative to noble metals for the oxygen evolution reaction (OER). Till date, however, their OER performance is far from satisfactory in terms of both activity and stability due to low amount of active sites and a severe aggregation/restacking effect. Herein, we developed the in situ growth of nitrogen-doped, oxygen-functionalized and edge/defect-rich vertically aligned graphene nanosheets on the surface of a carbon cloth (N, O-VAGNs/CC). The separate graphene nanosheets fixed to the surface of the carbon cloth could effectively avoid aggregation. In addition, the vertically aligned morphology provides a highly superficial area and open space, resulting in maximally exposed active sites and unhindered gas transport. Moreover, compared with undoped graphene, the N, O-VAGNs/CC possesses numerous functional groups, abundant defects and active-edges, which are favorable to OER activity. Impressively, this graphene design drastically enhanced OER activity with an overpotential of 351 mV and a Tafel slope of 38 mV dec⁻¹ in alkaline solution, which is superior even to the state-of-the-art RuO₂ electrocatalysts, indicating remarkable stability and durability in alkaline media. This study may provide an insight into the design and fabrication of alternatives to noble metal-based catalysts for the OER.

中文翻译：

氮掺杂，氧官能化，边缘和缺陷丰富的垂直排列石墨烯，可大大增强氧的释放反应†

石墨烯基电催化剂已被广泛开发为氧释放反应（OER）的无金属替代贵金属的替代物。然而，直到现在，由于活性位点的数量少和严重的聚集/再堆积效应，它们的OER性能在活性和稳定性上都还不能令人满意。在这里，我们就地开发了碳布表面上氮掺杂，氧官能化和边缘/缺陷丰富的垂直排列的石墨烯纳米片的生长（N，O-VAGNs / CC）。固定在碳布表面的单独石墨烯纳米片可以有效避免聚集。另外，垂直排列的形态提供了高度的表面区域和开放空间，从而导致最大程度地暴露了活性位点，并且气体传输不受阻碍。此外，与未掺杂的石墨烯相比，N，O-VAGNs / CC具有许多官能团，丰富的缺陷和活性边缘，有利于OER活性。令人印象深刻的是，该石墨烯设计大大增强了OER活性，在碱性溶液中的过电势为351 mV，Tafel斜率为38 mV dec ^-1，甚至优于最新的RuO_2种电催化剂，在碱性介质中显示出显着的稳定性和耐久性。这项研究可能会为OER的贵金属基催化剂的替代品的设计和制造提供一个见识。

更新日期：2018-01-01

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