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首页> 外文期刊>Journal of Colloid and Interface Science >Fast cooling induced grain-boundary-rich copper oxide for electrocatalytic carbon dioxide reduction to ethanol
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Fast cooling induced grain-boundary-rich copper oxide for electrocatalytic carbon dioxide reduction to ethanol

机译：用于电催化二氧化碳还原到乙醇的快速冷却诱导富晶富铜氧化物

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摘要

Electrochemical CO2 reduction with rationally designed copper-based electrocatalysts is a promising approach to reduce CO2 emission and produce value-added products. Grain boundaries and micronstrains inside catalysts have been proposed as active catalytic sites, while the controlled formation of these sites has remained highly challenging. In this work, we developed a strategy of creating high-density grain boundaries and micron-strains inside CuO electrocatalysts by fast cooling with liquid nitrogen. Compared to samples with slower cooling rates, the fast cooled CuO showed clear difference in their crystal domain sizes, micro-strain densities, and the chemisorption capacities of CO2 and CO. This micro-strain-rich CuO electrocatalyst exhibited a high total current density over 300 mA.cm(-2), and an outstanding Faradaic efficiency for C-2 products (with a majority to ethanol) at similar to 1.0 V vs. reversible hydrogen electrode. Our work suggests a facile approach of tuning grain boundaries and micro-strains inside Cu-based electrocatalysts to scale up electrochemical CO2 reduction for high value-added products. (C) 2020 Elsevier Inc. All rights reserved.
机译：用合理设计的铜基电催化剂的电化学二氧化碳减少是一种有望的方法，可以减少二氧化碳排放并产生增值产品。已经提出了催化剂内部的晶界和微三段作为活性催化位点，而这些位点的受控形成保持高度挑战性。在这项工作中，我们通过用液氮快速冷却，开发了一种在Cuo电催化剂内产生高密度晶粒边界和微米菌株的策略。与冷却速率较慢的样品相比，快速冷却的CuO在其晶体畴尺寸，微菌株密度和CO2和CO的化学吸取能力中显示出明显的差异。这种微菌株丰富的CuO电催化剂的总电流密度高300 mA.CM（-2），以及C-2产品的优异竞技效率（具有大多数至乙醇），类似于1.0V与可逆氢电极。我们的作品表明了在Cu基电催化剂内调整晶界和微菌株的容易方法，以扩大高附加值产品的电化学二氧化碳减少。 （c）2020 Elsevier Inc.保留所有权利。

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