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Integrated design for electrocatalytic carbon dioxide reduction

机译：集成设计electrocatalytic碳减少二氧化碳

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The electrocatalytic carbon dioxide reduction reaction (CO2RR) to produce valuable fuels and chemicals with renewable energy inputs is an attractive route to convert intermittent green energy sources (e.g., solar and wind) to chemical energy, alleviate our dependence on fossil fuels, and simultaneously reduce net carbon dioxide emission. However, the generation of reduced multi-carbon products with high energy density and wide applicability from the CO2RR, such as oxygenates and hydrocarbons, suffers from high overpotential, slow reaction rate, and low selectivity due to its intrinsic multi-electron transfer nature. Moreover, the involved anodic oxygen evolution reaction (OER) also requires large overpotential and its product O-2 bears limited economic value. The potentially generated reactive oxygen species (ROS) during the OER may also degrade the membrane of a CO2 reduction electrolyzer. Herein, we review the recent progress in novel integrated strategies to address the aforementioned challenges in the electrocatalytic CO2RR. These innovative strategies include (1) concurrent CO2 electroreduction via co-feeding additional chemicals besides CO2 gas, (2) tandem CO2 electroreduction utilizing other catalysts for converting the in situ formed products from the CO2RR into more valuable chemicals, and (3) hybrid CO2 electroreduction through integrating thermodynamically more favourable organic upgrading reactions to replace the anodic OER. We specifically highlight these novel integrated electrolyzer designs instead of focusing on nanostructured engineering of various electrocatalysts, in the hope of inspiring others to approach CO2 electroreduction from a holistic perspective. The current challenges and future opportunities of electrocatalytic CO2 reduction will also be discussed at the end.
机译：electrocatalytic二氧化碳的减少反应(CO2RR)产生有价值的燃料和化学与可再生能源的输入是一个有吸引力的路线将间歇性的绿色能源(如太阳能和风能)的化学物质能源,减少我们对化石燃料的依赖,同时减少净二氧化碳发射。multi-carbon具有高能量密度的产品和CO2RR的广泛适用性,如含氧化合物和碳氢化合物,患有高过电压、慢反应速率和低选择性由于其内在的多电子传输性质。氧反应(OER)还需要进化大超电势,其产品0 2熊有限的经济价值。活性氧(ROS)在OER可能也降低了膜的减少二氧化碳电解槽。新奇的集成策略的进展解决上述挑战electrocatalytic CO2RR。策略包括(1)并发二氧化碳电解还原通过co-feeding额外化学物质除了二氧化碳气体,(2)串联二氧化碳电解还原利用其他的催化剂将原位形成的产品CO2RR到更有价值的化学物质,(3)通过集成混合二氧化碳电解还原从热力学角度来看更有利的有机升级更换阳极OER的反应。特别强调这些小说集成电解槽的设计而不是关注纳米工程的各种electrocatalysts,激励别人的希望从整体方法二氧化碳电解还原视角。electrocatalytic二氧化碳减排的机会最后还将讨论。

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