Tunable Selectivity and High Efficiency of CO(2) Electroreduction via Borate-Enhanced Molten Salt Electrolysis.
Tunable Selectivity and High Efficiency of CO(2) Electroreduction via Borate-Enhanced Molten Salt Electrolysis.
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通过硼酸盐增强熔盐电解实现 CO2 电还原的可调选择性和高效率
DOI：
10.1016/j.isci.2020.101607
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发表时间：
2020-10-23
期刊：
影响因子：
5.8
通讯作者：
Wang D
中科院分区：
文献类型：
--
作者：
Hu L;Deng B;Du K;Jiang R;Dou Y;Wang D
通过CO2还原反应（CO2 RR）将CO2转化为具有附加值的化学燃料和功能材料，有利于实现碳中和的能源循环。然而，有效地将CO2 RR导向期望的产品仍然具有挑战性。在此，我们报道了一种简单的策略，以在具有高电流密度（例如100 mA/cm 2）的正移阴极电势下在含硼酸盐的熔融电解质中扩展产物物种，其可以选择性地将CO2电转化为所需产物（CO或固体碳纳米纤维，分别达到约90%的高选择性）。硼酸盐可以作为电解质碱度的控制器，以缓冲CO2 RR过程中连续产生的O2−的浓度，积极地改变捕获的CO2的还原电位，同时延长产物种类。在CO2气氛下，具有可持续的缓冲效应。与无硼酸盐电解液相比，CO2转化效率提高3倍以上，电解能耗降低40%以上。CO2还原反应的产物选择性高度可调，通过调节电解质碱度实现产物种类的扩展硼酸盐辅助除氧有利于生成CO2衍生的CNF，实现更低的能耗和更高的CO2转化效率化学工程;电化学;工业化学
Converting CO2 into value-added chemical fuels and functional materials by CO2 reduction reaction (CO2RR) is conducive to achieving a carbon-neutral energy cycle. However, it is still challenging to efficiently navigate CO2RR toward desirable products. Herein, we report a facile strategy to extend product species in borate-containing molten electrolyte at a positively shifted cathodic potential with a high current density (e.g. 100 mA/cm2), which can selectively electro-transform CO2 into desired products (either CO or solid carbon nanofibers, respectively reaching a high selectivity of ∼90%). The borates can act as a controller of electrolyte alkalinity to buffer the concentration of sequentially generated O2− during CO2RR, positively shifting the reduction potential of the captured CO2 and concurrently extending the product species. The sustainable buffering effect is available under CO2 atmosphere. Compared with borate-free electrolyte, the CO2 conversion efficiency is over three times higher, while the electrolysis energy consumption is decreased by over 40%. The product selectivity of CO2 reduction reaction was highly tunable Extending product species via regulating electrolyte alkalinity was achieved Borate-assisted oxygen removal was conducive to produce CO2-derived CNFs Lower energy consumption and higher CO2 conversion efficiency were achieved Chemical Engineering; Electrochemistry; Industrial Chemistry
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影响因子：
10.9
作者：
Ijije, Happiness V.;Sun, Chenggong;Chen, George Z.
通讯作者：
Chen, George Z.
DOI：
10.3891/acta.chem.scand.01-0592
发表时间：
1947-01-01
期刊：
ACTA CHEMICA SCANDINAVICA
影响因子：
--
作者：
FLOOD, H;FORLAND, T
通讯作者：
FORLAND, T
从熔融 LiCl-KCl-CaCO3 中捕获的 CO2 电解合成碳：电极电位和温度对中空结构和锂存储性能的关键作用
影响因子：
6.6
作者：
Deng, Bowen;Tang, Juanjuan;Wang, Dihua
通讯作者：
Wang, Dihua
影响因子：
16.6
作者：
Liu, Subiao;Lu, Xue Feng;Lou, Xiong Wen (David)
通讯作者：
Lou, Xiong Wen (David)
影响因子：
3.9
作者：
Kaplan, Valery;Wachtel, Ellen;Lubomirsky, Igor
通讯作者：
Lubomirsky, Igor