Electrochemical CO2 Reduction to Formic Acid at Low Overpotential and with High Faradaic Efficiency on Carbon-Supported Bimetallic Pd-Pt Nanoparticles
Electrochemical CO2 Reduction to Formic Acid at Low Overpotential and with High Faradaic Efficiency on Carbon-Supported Bimetallic Pd-Pt Nanoparticles
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DOI：
10.1021/acscatal.5b00602
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发表时间：
2015-07-01
期刊：
影响因子：
12.9
通讯作者：
Koper, Marc T. M.
中科院分区：
文献类型：
--
作者：
Kortlever, Ruud;Peters, Ines;Koper, Marc T. M.
CO2的电化学还原最近引起了人们的极大兴趣，因为它是一种用于储存可再生能源的可能反应。在这里，我们报告的PdxPt（100-x）/C纳米粒子的合成和它们的电催化性能的CO2还原为甲酸，与它们的活性相比，逆氧化的甲酸CO2。我们发现PdxPt（100-x）/C纳米颗粒具有非常低的起始电位，用于将CO2还原为约100 - 200的甲酸。0 V vs RHE，其接近该反应的理论平衡电势0.02 V vs RHE。此外，Pd 70 Pt 30/C催化剂在相对于RHE的-0.4V下电解1小时后显示出88%的对甲酸的法拉第效率，平均电流密度类似于5 mA/cm（2）。因此，与最近报道的催化剂相比，该催化剂显示出对甲酸的竞争性或甚至更好的法拉第效率，在显著更低的过电位下，同时避免了用先前报道的Pd基催化剂观察到的强烈失活。
The electrochemical reduction of CO2 has attracted significant interest recently, as it is a possible reaction for the storage of renewable energy. Here, we report on the synthesis of PdxPt(100-x)/C nanoparticles and their electrocatalytic properties for the reduction of CO2 to formic acid, compared with their activity for the reverse oxidation of formic acid to CO2. We find that PdxPt(100-x)/C nanoparticles have a very low onset potential for the reduction of CO2 to formic acid of ca. 0 V vs RHE, which approaches the theoretical equilibrium potential of 0.02 V vs RHE for this reaction. Furthermore, the Pd70Pt30/C catalyst shows a faradaic efficiency of 88% toward formic acid after 1 h of electrolysis at -0.4 V vs RHE with an average current density of similar to 5 mA/cm(2). Therefore, this catalyst shows a competing or even better faradaic efficiency toward formic acid compared to recently reported catalysts, at a substantially lower overpotential, while avoiding a strong deactivation that was observed with previously reported Pd-based catalysts.