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International Conference on Innovative Applied Energy    

E-Proceedings ISBN: 978-1-912532-05-6

St Cross College, University of Oxford, United Kingdom



Photoelectrochemical reduction of CO2 to liquid fuels on octahedral catalyst of carbonized Cu(benzene 1,3,5-tricarboxylic acid [BTC]) doped with Pd nanoparticles.



Xiaoxu Xuan and Jun Cheng 

State Key Laboratory of Clean Energy Utilization, Zhejiang UniversityNo.38 Zheda RoadHangzhou, China


Paper Abstract

In order to directionally convert CO2 into liquid fuels, Cu(BTC) doped with Pd nanoparticles was carbonized to obtain a novel octahedral catalyst C-Pd/Cu for selective reduction of CO2 to alcohol products. XRD patterns showed the Cu characteristic peak in C-8wt% Pd/Cu catalyst shifted to 2θ=43.22°. The inter planar distance of Cu nanoparticles in C-8wt% Pd/Cu catalyst was 2.0915 nm, which was larger than those in other catalysts. XPS spectra showed main peak shift to lower binding energy, representing the influence of Pd doping to Cu. SEM and TEM indicated that many ~70 nm Cu particles and ~10 nm Pd nanoparticles uniformly distributed in ~250 nm porous carbon-based octahedral particles. Raman spectrum implied that C-Pd/Cu catalyst with many defects (band ratio ID/IG = 0.84) provided more active sites for intermediates adsorption and facilitated electron transfer. BET result showed C-Pd/Cu catalyst had many mesporous. It was found by density functional theory (DFT) calculations that C-Pd/Cu catalyst had good selectivity towards alcohol products such as methanol, the reaction energy towards producing CH3OH was 19.5 eV lower than that of producing HCOOH. The pathway CO2→COOH*→CO*+H2O→COH*→HCOH*→CH2OH*→CH3OH was the most favored to produce CH3OH. CO2 photoelectrochemical reduction reaction was then conducted in a photoelectrochemical reduction cell (PEC) to verify the calculation result. The total carbon atom conversion rate over C-8 wt% Pd/Cu catalyst reached 2380 nmol·h−1cm−2 with a high liquid products selectivity towards alcohol products, which was in good agreement with DFT calculation results. And the PEC system was proved to have more energy input under the same applied voltage compared with the electrochemical system. 

Paper Keywords
Bimetallic nanoparticles; porous carbon-based catalyst; DFT calculations; CO2 photoelectrochemical reduction.
Corresponding author Biography
Xiaoxu Xuan is a Ph. D candidate in College of Energy Engineering at Zhejiang University, China. Her research topic is CO2 photoelectrochemical reduction by using Metal Organic Frameworks (MOFs) derived catalysts.

The International Conference on Innovative Applied Energy (IAPE’18)