Electroreduction of Carbon Dioxide to Formic Acid and Methanol over a Palladium/Polyaniline Catalyst in Acidic Solution: A Study of the Palladium Size Effect

TY - JOUR

T1 - Electroreduction of Carbon Dioxide to Formic Acid and Methanol over a Palladium/Polyaniline Catalyst in Acidic Solution

T2 - A Study of the Palladium Size Effect

AU - Zheng, Weiran

AU - Man, Ho Wing

AU - Ye, Lin

AU - Tsang, Shik Chi Edman

N1 - Publisher Copyright: © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

PY - 2017/6/1

Y1 - 2017/6/1

N2 - We controlled the reaction temperature and feeding rate of the reducing agent to show that Pd nanoparticles (NPs) with different sizes can be synthesized from the reduction of their precursor on polyaniline (PANI) as a solid support. We used UV/Vis spectroscopy, 1H NMR spectroscopy, and IR spectroscopy to identify the electronic and catalytic interactions between Pd NPs and PANI. For the first time, that the unique redox properties of Pd/PANI display a high overpotential for hydrogen evolution, which suppresses this competitive reaction for the electroreduction of CO2 in an acidic solution. As a result, two main liquid products (HCOOH and CH3OH) can be produced selectively with only trace amounts of CO in the gas phase. The current efficiencies for HCOOH and CH3OH increase with the decreasing Pd NP size within the potential range of −0.5 to −0.9 V. The highest current efficiencies for HCOOH (22.8 %) and CH3OH (5.4 %) are thus obtained over Pd(1.31 nm)/PANI at −0.9 V.

AB - We controlled the reaction temperature and feeding rate of the reducing agent to show that Pd nanoparticles (NPs) with different sizes can be synthesized from the reduction of their precursor on polyaniline (PANI) as a solid support. We used UV/Vis spectroscopy, 1H NMR spectroscopy, and IR spectroscopy to identify the electronic and catalytic interactions between Pd NPs and PANI. For the first time, that the unique redox properties of Pd/PANI display a high overpotential for hydrogen evolution, which suppresses this competitive reaction for the electroreduction of CO2 in an acidic solution. As a result, two main liquid products (HCOOH and CH3OH) can be produced selectively with only trace amounts of CO in the gas phase. The current efficiencies for HCOOH and CH3OH increase with the decreasing Pd NP size within the potential range of −0.5 to −0.9 V. The highest current efficiencies for HCOOH (22.8 %) and CH3OH (5.4 %) are thus obtained over Pd(1.31 nm)/PANI at −0.9 V.

KW - electrochemistry

KW - nanoparticles

KW - palladium

KW - polymers

KW - supported catalysts

UR - http://www.scopus.com/inward/record.url?scp=85018869946&partnerID=8YFLogxK

U2 - 10.1002/ente.201600659

DO - 10.1002/ente.201600659

M3 - 文章

AN - SCOPUS:85018869946

SN - 2194-4288

VL - 5

SP - 937

EP - 944

JO - Energy Technology

JF - Energy Technology

IS - 6

ER -