Oxygen-tolerant electroproduction of C2 products from simulated flue gas,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Oxygen-tolerant electroproduction of C2 products from simulated flue gas
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2019/12/23 , DOI: 10.1039/c9ee03077h
Yi Xu _{1,

2,

3,

4} , Jonathan P. Edwards _{1,

2,

3,

4} , Junjie Zhong _{1,

2,

3,

4} , Colin P. O’Brien _{1,

2,

3,

4} , Christine M. Gabardo _{1,

2,

3,

4} , Christopher McCallum _{1,

2,

3,

4} , Jun Li _{1,

2,

3,

4,

5} , Cao-Thang Dinh _{2,

3,

4,

5} , Edward H. Sargent _{2,

3,

4,

5} , David Sinton _{1,

2,

3,

4}

Affiliation

The electroreduction of carbon dioxide (CO₂) to C₂ products is a promising approach to divert and utilize CO₂ emissions. However, the requirement of a purified CO₂ feedstock decreases the economic feasibility of CO₂ electrolysis. Direct utilization of industrial flue gas streams is encumbered by low CO₂ concentrations and reactive oxygen (O₂) impurities. We demonstrate that pressurization enables efficient CO₂ electroreduction of dilute CO₂ streams (15% v/v); however, with the inclusion of O₂ (4% v/v), the oxygen reduction reaction (ORR) displaces CO₂ reduction and consumes up to 99% of the applied current in systems based on previously-reported catalysts. We develop a hydrated ionomer catalyst coating strategy that selectively slows O₂ transport and stabilizes the copper catalyst. Applying this strategy, we convert an O₂-containing flue gas to C₂ products at a faradaic efficiency (FE) of 68% and a non-iR-corrected full cell energetic efficiency (EE) of 26%.

中文翻译：

模拟烟气产生的C2产物的耐氧电生产

将二氧化碳（CO ₂）电还原为C ₂产品是转移和利用CO ₂排放物的一种有前途的方法。然而，对纯化的CO ₂原料的需求降低了CO ₂电解的经济可行性。低浓度的CO ₂和活性氧（O ₂）杂质阻碍了工业烟气的直接利用。我们证明了加压使稀的CO ₂流（15％v / v）能够有效地进行CO ₂电还原。但是，通过加入O ₂（4％v / v），氧还原反应（ORR）取代了CO ₂在以前报告过的催化剂体系中，它减少了碳氢化合物的消耗，并消耗了高达99％的施加电流。我们开发了一种水合离聚物催化剂涂层策略，可以选择性地减慢O _2的传输速度并稳定铜催化剂。应用此策略，我们以68％的法拉第效率（FE）和26％的未经iR校正的全电池能量效率（EE）将含O ₂的烟道气转化为C ₂产品。

更新日期：2020-02-19

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11