Electrokinetic and in situ spectroscopic investigations of CO electrochemical reduction on copper.
Electrokinetic and in situ spectroscopic investigations of CO electrochemical reduction on copper.
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CO在铜上电化学还原的动电学和原位光谱研究
DOI:
10.1038/s41467-021-23582-2
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发表时间:
2021-06-01
影响因子:
16.6
通讯作者:
Lu Q
中科院分区:
文献类型:
--
作者:
Li J;Chang X;Zhang H;Malkani AS;Cheng MJ;Xu B;Lu Q
Rigorous electrokinetic results are key to understanding the reaction mechanisms in the electrochemical CO reduction reaction (CORR), however, most reported results are compromised by the CO mass transport limitation. In this work, we determined mass transport-free CORR kinetics by employing a gas-diffusion type electrode and identified dependence of catalyst surface speciation on the electrolyte pH using in-situ surface enhanced vibrational spectroscopies. Based on the measured Tafel slopes and reaction orders, we demonstrate that the formation rates of C2+products are most likely limited by the dimerization of CO adsorbate. CH4production is limited by the CO hydrogenation step via a proton coupled electron transfer and a chemical hydrogenation step of CO by adsorbed hydrogen atom in weakly (7 < pH < 11) and strongly (pH > 11) alkaline electrolytes, respectively. Further, CH4and C2+products are likely formed on distinct types of active sites.
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影响因子:
12.9
作者:
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通讯作者:
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DOI:
10.1073/pnas.1612106114
发表时间:
2017-02-21
影响因子:
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作者:
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