Engineering of carbon nanotube-grafted carbon nanosheets encapsulating cobalt nanoparticles for efficient electrocatalytic oxygen evolution,Journal of Materials Chemistry A

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Engineering of carbon nanotube-grafted carbon nanosheets encapsulating cobalt nanoparticles for efficient electrocatalytic oxygen evolution
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-11-12 , DOI: 10.1039/d0ta01424a
Weiwei Yang _{1,

2,

3,

4,

5} , Yu Bai _{1,

2,

3,

4,

5} , Jiahuan Ma _{1,

2,

3,

4,

5} , Zhenhua Wang _{1,

2,

3,

4,

5} , Wang Sun _{1,

2,

3,

4,

5} , Jinshuo Qiao _{1,

2,

3,

4,

5} , Huiqun Cai _{5,

6,

7} , Kening Sun _{1,

2,

3,

4,

5}

Affiliation

The development of highly efficient and low-cost electrocatalysts for the oxygen evolution reaction (OER) has great significance in various renewable energy systems. Herein, we report the rational design and synthesis of cobalt nanoparticles encapsulated in nitrogen-doped carbon nanotube-grafted carbon nanosheets (LDH-R@Co(v-Zn)-NCNTs), via the in situ growth of ZnCo bimetallic zeolitic imidazolate frameworks (ZnCo-ZIFs) on the surface of layered double hydroxides (LDHs) and their subsequent reductive calcination. The incorporation of volatile zinc spatially isolates the cobalt atoms, thus suppressing the aggregation of cobalt nanoparticles, while the use of LDHs prevents the aggregation of ZnCo-ZIFs. The optimal composite exhibits good catalytic activity toward the OER in alkaline media, with a small overpotential of 344 mV at 10 mA cm⁻² and a low Tafel slope of 75 mV dec⁻¹, values that are superior to those of commercial IrO₂. The superior catalytic activity is attributed to the highly sufficient exposure of active sites and the enhanced electron conductibility of the composite. This work demonstrates an effective strategy by which to regulate a nanostructure and develop highly efficient OER catalysts.

中文翻译：

包裹纳米碳管的碳纳米管接枝碳纳米片的工程设计，以有效地产生电催化氧

用于氧气析出反应（OER）的高效，低成本电催化剂的开发在各种可再生能源系统中具有重要意义。在本文中，我们报道了封装在氮掺杂的碳纳米管接枝碳纳米片（LDH-R @钴（V-Zn）的-NCNTs）钴纳米颗粒的合理的设计和合成，通过所述原位层状双氢氧化物（LDHs）表面上ZnCo双金属沸石咪唑酸盐骨架（ZnCo-ZIFs）的生长及其随后的还原煅烧。挥发性锌的掺入在空间上隔离了钴原子，从而抑制了钴纳米颗粒的聚集，而使用LDH阻止了ZnCo-ZIF的聚集。最佳的复合材料在碱性介质中对OER表现出良好的催化活性，在10 mA cm ^-2下具有344 mV的小过电位，在75 mV dec ^-1的低Tafel斜率，其值优于商品IrO ₂。优异的催化活性归因于活性部位的高度充分暴露和复合材料增强的电子传导性。这项工作表明了一种有效的策略，通过该策略可以调节纳米结构并开发高效的OER催化剂。

更新日期：2020-11-25

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