In situ encapsulated and well dispersed Co3O4 nanoparticles as efficient and stable electrocatalysts for high-performance CO2 reduction,Journal of Materials Chemistry A

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In situ encapsulated and well dispersed Co3O4 nanoparticles as efficient and stable electrocatalysts for high-performance CO2 reduction
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-17 , DOI: 10.1039/d0ta03770b
Hengpan Yang _{1,

2,

3,

4,

5} , Xinyao Yu _{1,

2,

3,

4,

5} , Jie Shao _{1,

2,

3,

4,

5} , Jingxuan Liao _{1,

2,

3,

4,

5} , Guodong Li _{1,

2,

3,

4,

5} , Qi Hu _{1,

2,

3,

4,

5} , Xiaoyao Chai _{1,

2,

3,

4,

5} , Qianling Zhang _{1,

2,

3,

4,

5} , Jianhong Liu _{1,

2,

3,

4,

5} , Chuanxin He _{1,

2,

3,

4,

5}

Affiliation

The development of appropriate catalysts with relatively low cost, good selectivity and excellent stability is one of the major issues in electrochemical reduction of CO₂. In this work, an efficient electrocatalyst was fabricated via ultra-small Co₃O₄ nanoparticles encapsulated within the tip of carbon nanotubes, denoted as Co/CNTs. Benefiting from the synergistic effects of highly active Co₃O₄ nanoparticles and well-graphitized carbon nanotubes, Co/CNTs exhibited remarkable performance in CO₂ electroreduction. In a conventional H-type cell, CO with a 90% faradaic efficiency and 20.6 mA cm⁻² partial current density was obtained at only −0.7 V_RHE cathode potential with 40 hour stability. Upon switching to a gas-diffusion device, the CO partial current density could reach as high as 232.6 mA cm⁻² with >80% faradaic efficiency, which might be even comparable to that of state-of-the-art CO₂ electrocatalysts. Our work could also provide a new strategy for developing non-noble metal catalysts for CO₂ electroreduction.

中文翻译：

原位包封且分散良好的Co3O4纳米颗粒可作为高效稳定的高效电还原催化剂

以较低的成本，良好的选择性和优异的稳定性来开发合适的催化剂是电化学还原CO ₂的主要问题之一。在这项工作中，通过封装在碳纳米管尖端（表示为Co / CNT）中的超小Co ₃ O ₄纳米颗粒，制造了高效的电催化剂。受益于高活性的Co ₃ O ₄纳米颗粒和良好石墨化的碳纳米管的协同作用，Co / CNT在CO _2的电还原中表现出卓越的性能。在传统的H型电池中，法拉第效率为90％，CO为20.6 mA cm ^-2的CO仅在-0.7 V _RHE阴极电位下可获得40小时稳定性的部分电流密度。切换到气体扩散装置后，CO分流密度可以高达232.6 mA cm ^-2，法拉第效率大于80％，这甚至可以与最新的CO ₂电催化剂媲美。我们的工作还可以为开发用于CO ₂电还原的非贵金属催化剂提供新的策略。

更新日期：2020-08-11

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