A broad parameter range for selective methane production with bicarbonate solution in electrochemical CO2 reduction,Sustainable Energy & Fuels

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A broad parameter range for selective methane production with bicarbonate solution in electrochemical CO2 reduction
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2017-08-17 00:00:00 , DOI: 10.1039/c7se00352h
Hiroshi Hashiba _{1,

2,

3,

4,

5} , Hiroki K. Sato _{1,

2,

3,

4} , Satoshi Yotsuhashi _{1,

2,

3,

4} , Katsushi Fujii _{4,

6,

7,

8} , Masakazu Sugiyama _{4,

9,

10,

11,

12} , Yoshiaki Nakano _{4,

5,

9,

11,

13}

Affiliation

This study demonstrated the previously unrecognised capability of potassium bicarbonate (KHCO₃) aqueous solutions to assist in the selective generation of methane (CH₄) over a wide range of reaction parameters during electrochemical CO₂ reduction over a bulk polycrystalline Cu catalyst. Compared with the results obtained with potassium chloride (KCl) electrolytes, a 0.5 M KHCO₃ solution maintained a higher faradaic efficiency (FE) for CH₄ production at higher current densities. This trend was further emphasised upon increasing the CO₂ pressure from near-ambient to 3 atm and incorporating stirring. The result was a FE above 50% over a range of current densities from 90 to more than 330 mA cm⁻². The maximum FE reached 80% at 0 °C, while maintaining a broad peak structure when plotted against current density, even over 300 mA cm⁻². The buffering ability of KHCO₃ appears to play an important role in increasing both the reaction rate and the selectivity for CH₄, especially when combined with an optimised CO₂ supply to the electrode and an ideal reaction temperature.

中文翻译：

电化学CO ₂还原中碳酸氢盐溶液选择性甲烷生产的广泛参数范围

这项研究证明了碳酸氢钾（KHCO ₃）水溶液以前无法识别的能力，可在大块多晶Cu催化剂上电化学还原CO _2的过程中，在很宽的反应参数范围内协助选择性地生成甲烷（CH ₄）。与使用氯化钾（KCl）电解质获得的结果相比，0.5 M KHCO ₃溶液在较高的电流密度下仍保持较高的法拉第效率（FE），用于生产CH ₄。随着CO ₂含量的增加，这一趋势得到了进一步强调压力从接近环境压力到3个大气压，并进行搅拌。结果是，在90至330 mA cm ^-2以上的电流密度范围内，FE高于50％。当相对于电流密度作图时，即使在300 mA cm ^-2以上，在0°C时，最大FE仍达到80％，同时保持宽峰结构。KHCO ₃的缓冲能力似乎在增加反应速率和对CH ₄的选择性方面都起着重要作用，尤其是当与向电极提供的最佳CO ₂供应和理想的反应温度结合使用时。

更新日期：2017-09-04

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