Efficient Electrochemical Conversion of CO2 to HCOOH Using Pd‐polyaniline/CNT Nanohybrids Prepared in Situ. Issue 12 (30th October 2015)

• Record Type: Journal Article
• Authors: Zhao, Chenchen; Yin, Zhongshu; Wang, Jianlong
• Is Part Of: ChemElectroChem. Volume 2:Issue 12(2015)
• Page Start: 1974
• Page End: 1982
• Publication Date: 2015-10-30
• Subjects: carbon dioxide -- electrochemical reduction -- formate -- palladium -- polyaniline; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201500328
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: Palladium has been proved to be an effective catalyst for CO2 electrocatalytic reduction. In this paper, nanostructured Pd particles fixed on polyaniline‐covered MWNTs surfaces (Pd‐PANI/CNT) were synthesized using an in situ method by reducing H2 PdCl4 in a mixture of MWNTs and aniline with sodium citrate as protective stabilizer. TEM micrographs indicate that the addition of sodium citrate optimizes the size and distribution of the nanoparticles. In a 3‐electrode system, both catalysts exhibit efficient and sustainable CO2 conversion towards formate but the one with sodium citrate addition is even better. The highest faradaic efficiency happens at −0.8 V vs. SCE and can be as high as 83 %. Based on the experiments, we put forward a mechanism of Pd‐catalyzed CO2 electroreduction in aqueous solution in which Pd forms a PdH x hybrid that is involved in the reduction process with Pd. Abstract : With or without you : Nanostructured Pd particles fixed on polyaniline‐covered MWNTs surfaces are synthesized using an in situ method by reducing H2 PdCl4 in a mixture of MWNTs and aniline with sodium citrate as protective stabilizer. TEM micrographs indicate that the addition of sodium citrate optimizes the size and distribution of the nanoparticles.