Core–shell-structured CNT@hydrous RuO2 as a H2/CO2 fuel cell cathode catalyst to promote CO2 methanation and generate electricity,Journal of Materials Chemistry A

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Core–shell-structured CNT@hydrous RuO2 as a H2/CO2 fuel cell cathode catalyst to promote CO2 methanation and generate electricity
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-2-10 , DOI: 10.1039/d0ta11232a
Jixiang Hu _{1,

2,

3,

4} , Ting Qu _{1,

2,

3,

4} , Yan Liu _{1,

2,

3,

4} , Xin Dai _{1,

2,

3,

4} , Qiang Tan _{1,

2,

3,

4} , Yuanzhen Chen _{1,

2,

3,

4} , Shengwu Guo _{1,

2,

3,

4} , Yongning Liu _{1,

2,

3,

4}

Affiliation

H₂/CO₂ fuel cells are important devices that convert CO₂ into CH₄ while generating electricity at mild temperatures. Anhydrous ruthenium oxide (RuO₂) on carbon nanotubes (CNT) as a cathode catalyst causes CO₂ methanation, but the methane production rate needs to be improved. In this paper, a core–shell structure of CNT@hydrous RuO₂ was fabricated by a simple sol–gel method. Unlike anhydrous RuO₂, which is a single electronic conductor, CNT@hydrous RuO₂ is a proton–electron mixed conductive material. Therefore, protons transfer not only in thepolybenzimidazole (PBI) film but also in the catalyst layer with the assistance of crystalline water in hydrous RuO₂. CO₂ methanation involving a reaction of multiple protons and electrons can be accelerated. The methane generation rate of CNT@hydrous RuO₂ reached 331.2 μmol g_cat⁻¹ h⁻¹ at 190 °C which is 3 times higher than that of anhydrous RuO₂. This research result provides an effective strategy for the catalytic reaction of multiple proton–electron transfers.

中文翻译：

核-壳结构的CNT @水合RuO2作为H2 / CO2燃料电池阴极催化剂，可促进CO2甲烷化并发电

H ₂ / CO ₂燃料电池是重要的设备，可在温和的温度下发电的同时将CO ₂转换为CH ₄。作为阴极催化剂的碳纳米管（CNT）上的无水氧化钌（RuO ₂）导致CO ₂甲烷化，但是甲烷的生产率需要提高。在本文中，通过简单的溶胶-凝胶法制备了CNT @ hydrous RuO ₂的核-壳结构。CNT @ hydrous RuO ₂不同于单电子导体的无水RuO ₂。是质子-电子混合导电材料。因此，借助于含水RuO _2中的结晶水，质子不仅在聚苯并咪唑（PBI）膜中转移，而且在催化剂层中转移。可以加速涉及多个质子和电子反应的CO ₂甲烷化。190℃时，CNT @ RuO ₂的甲烷生成速率达到331.2μmolg _cat^-1 h ^-1，是无水RuO _2的3倍。该研究结果为多种质子-电子转移的催化反应提供了有效的策略。

更新日期：2021-02-26

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