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pH Matters When Reducing CO2 in an Electrochemical Flow Cell
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-09-04 , DOI: 10.1021/acsenergylett.0c01606 Zishuai Zhang 1 , Luke Melo 1 , Ryan P. Jansonius 1 , Faezeh Habibzadeh 1 , Edward R. Grant 1 , Curtis P. Berlinguette 1, 2, 3, 4
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-09-04 , DOI: 10.1021/acsenergylett.0c01606 Zishuai Zhang 1 , Luke Melo 1 , Ryan P. Jansonius 1 , Faezeh Habibzadeh 1 , Edward R. Grant 1 , Curtis P. Berlinguette 1, 2, 3, 4
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The pH at the electrocatalyst surface plays a key role in defining the activity and selectivity of the CO2 reduction reaction (CO2RR). We report here operando Raman measurements of the catalyst surface in a customized CO2RR flow cell that enable the measure of pH. Using this flow cell, we were able to measure surface pH as a function of time, current density, and proximity to the catalyst surface during the electrolysis of bicarbonate solutions. We observed that increasing the current density from 0 to 200 mA cm–2 increased the surface pH from 8.5 to 10.3. We also show here that operation at elevated temperatures (70 °C) results in an increased surface pH and serves to suppress the competing and undesirable hydrogen evolution reaction.
中文翻译：
在电化学流通池中还原CO 2时pH值很重要
电催化剂表面的pH在定义CO 2还原反应（CO 2 RR）的活性和选择性方面起着关键作用。我们在此报告在定制的CO 2 RR流通池中对催化剂表面进行的操作拉曼测量，从而可以测量pH。使用该流通池，我们能够测量碳酸氢盐溶液电解过程中表面pH随时间，电流密度和与催化剂表面的接近关系。我们观察到电流密度从0增加到200 mA cm –2将表面pH值从8.5增加到10.3。我们在此还表明，在高温（70°C）下操作会导致表面pH值升高，并起到抑制竞争性和不良氢释放反应的作用。
更新日期：2020-10-11
中文翻译：
在电化学流通池中还原CO 2时pH值很重要
电催化剂表面的pH在定义CO 2还原反应（CO 2 RR）的活性和选择性方面起着关键作用。我们在此报告在定制的CO 2 RR流通池中对催化剂表面进行的操作拉曼测量，从而可以测量pH。使用该流通池，我们能够测量碳酸氢盐溶液电解过程中表面pH随时间，电流密度和与催化剂表面的接近关系。我们观察到电流密度从0增加到200 mA cm –2将表面pH值从8.5增加到10.3。我们在此还表明，在高温（70°C）下操作会导致表面pH值升高，并起到抑制竞争性和不良氢释放反应的作用。
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