Switchable CO2 electroreduction via engineering active phases of Pd nanoparticles
carbon-dioxide electroreduction, Pd nanoparticles, active phase, selectivity fluctuation
ABSTRACT Active-phase engineering is regularly utilized to tune the selectivity of metal nanoparticles (NPs) in heterogeneous catalysis. However, the lack of understanding of the active phase in electrocatalysis has hampered the development of efficient catalysts for CO2 electroreduction. Herein, we report the systematic engineering of active phases of Pd NPs, which are exploited to select reaction pathways for CO2 electroreduction. In situ X-ray absorption spectroscopy, in situ attenuated total reflection-infrared spectroscopy, and density functional theory calculations suggest that the formation of a hydrogen-adsorbed Pd surface on a mixture of the α- and β-phases of a palladium-hydride core (α+β PdHx@PdHx) above −0.2 V (vs. a reversible hydrogen electrode) facilitates formate production via the HCOO* intermediate, whereas the formation of a metallic Pd surface on the β-phase Pd hydride core (β PdHx@Pd) below −0.5 V promotes CO production via the COOH* intermediate. The main product, which is either formate or CO, can be selectively produced with high Faradaic efficiencies (>90%) and mass activities in the potential window of 0.05 to −0.9 V with scalable application demonstration.
Tsinghua University Press
Dunfeng Gao,Hu Zhou,Fan Cai,Dongniu Wang,Yongfeng Hu,Bei Jiang,Wen-Bin Cai,Xiaoqi Chen,Rui Si,Fan Yang,Shu Miao,Jianguo Wang,Guoxiong Wang,Xinhe Bao, Switchable CO2 electroreduction via engineering active phases of Pd nanoparticles. NanoRes.2017, 10(6): 2181–2191