Endrődi B, Kecsenovity E, Samu A, Darvas F, Jones R V, Török V, Danyi A, Janáky C
Department of Physical Chemistry and Materials Science, Interdisciplinary Excellence Centre, University of Szeged, Rerrich Square 1, Szeged H-6720, Hungary.
ThalesNano Inc., Záhony u. 7, Budapest 1031, Hungary.
ACS Energy Lett. 2019 Jul 12;4(7):1770-1777. doi: 10.1021/acsenergylett.9b01142. Epub 2019 Jun 27.
Electrochemical reduction of CO is a value-added approach to both decrease the atmospheric emission of carbon dioxide and form valuable chemicals. We present a zero gap electrolyzer cell, which continuously converts gas phase CO to products without using any liquid catholyte. This is the first report of a multilayer CO electrolyzer stack for scaling up the electrolysis process. CO formation with partial current densities above 250 mA cm were achieved routinely, which was further increased to 300 mA cm (with ∼95% faradic efficiency) by pressurizing the CO inlet (up to 10 bar). Evenly distributing the CO gas among the layers, the electrolyzer operates identically to the sum of multiple single-layer electrolyzer cells. When passing the CO gas through the layers consecutively, the CO conversion efficiency increased. The electrolyzer provides high partial current density, low cell voltage (-3.0 V), high conversion efficiency (up to 40%), and high selectivity for CO production.
电化学还原一氧化碳是一种既能减少大气中二氧化碳排放又能生成有价值化学品的增值方法。我们展示了一种零间隙电解槽，它无需使用任何液体阴极电解液就能将气相一氧化碳连续转化为产物。这是关于用于扩大电解过程规模的多层一氧化碳电解槽堆栈的首份报告。常规情况下可实现高于250 mA/cm²的局部电流密度来生成一氧化碳，通过对一氧化碳入口加压（高达10巴），该局部电流密度进一步提高到300 mA/cm²（法拉第效率约为95%）。通过在各层之间均匀分配一氧化碳气体，该电解槽的运行效果等同于多个单层电解槽的总和。当一氧化碳气体依次通过各层时，一氧化碳转化效率会提高。该电解槽具有高局部电流密度、低槽电压（-3.0 V）、高转化效率（高达40%）以及对一氧化碳生成的高选择性。
