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EACON 2020

EurAsian Conference on Nanophotonics

April 6 – 9, 2020 / Jena, Germany

Heng-Liang Wu

Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan.

Controlling the Oxidation State of Cu Electrode and Reaction Intermediates for Electrochemical CO2 Reduction to Ethylene

Electrochemical CO2 reduction has been considered as a potential route to convert harmful CO2 to valuable hydrocarbons for sustainable carbon cycles. Cu catalyst has been recognized as one and the only catalyst which produced hydrocarbons as primary products;1 however, the poor selectivity obstructs the applications. According to DFT calculations, surface CO is the most common and important intermediate during CO2 reduction reaction,2 but further reaction mechanisms are still unclear, e.g. protonation and dimerization of CO. Cu(I) oxide was correlated to the formation of C2 products during reactions,3 yet there is lack of solid intermediate evidence to distinguish different reaction routes. 

In this talk, we used in situ surface-enhanced infrared absorption spectroscopy, in situ X-ray absorption spectroscopy (Cu L-edge) and on-line GC to study the electrochemical CO2 reduction mechanism occurred in different copper catalysts. We observed various CO intermediates such as COatop and CObridge, on copper surface during electrochemical CO2 reduction and the formation of COatop/CObridge can be correlated to the existence of surface Cu(I) and Cu(0) sites, respectively. Our results suggested that the existence of COatop can result in the formation of methane during further reduction. In addition, ethylene can be produced in the presence of COatop and CObridge. Our results both prove theoretical predictions4 and meet the gap to illustrate the detail reaction mechanisms from CO2 to hydrocarbons. We next propose a method to create Cu(I) sites efficiently on copper catalysts.


  1. Y. Hori, K. Kikuchi, S. Suzuki, Chem. Lett. 1985, 1695.
  2. T. Cheng, H. Xiao, W. A. Goddard, J. Am. Chem. Soc. 2016, 138, 13802.
  3. H. Mistry, A. S. Varela, C. S. Bonifacio, I. Zegkinoglou, I. Sinev, Y. W. Choi, K. Kisslinger, E. A. Stach, J. C. Yang, P. Strasser, B. R. Cuenya, Nat. Commun. 2016, 7, 12123.
  4. H. Xiao, W. A. Goddard, T. Cheng, Y. Liu, Proc. Natl. Acad. Sci. USA 2017, 28, 201702405-6688.

Further Talks

Andrea Csáki

Microfludic Synthesis of plasmonic Nanoparticles for Sensing Applications

Andrey Turchanin

Controlled growth of transition metal dichalcogenide monolayers for applications in nanoelectronic and nanophotonic devices

Chi Chen

Near Field Spectroscopic Imaging: from Hard to Soft Materials

Chi-How Peng

Cobalt mediated controlled/living radical polymerization: from mechanism understanding to materials application

Chun-Hong Kuo

Bridging Energy and Chemistry via Nanoarchitectonic Engineering at Atomic Scale

Falk Eilenberger

Integration of two-dimensional materials in optical systems for nonlinear optics, sensing, and single photon sources

Frank Setzpfandt

Nonlinear frequency conversion in nanostructured optical systems for application in quantum photonics

Heng-Liang Wu

Controlling the Oxidation State of Cu Electrode and Reaction Intermediates for Electrochemical CO2 Reduction to Ethylene

Kien-Voon Kong

Direct Observation of Reaction Intermediates of Metal-based Therapeutic Agents in Single Living Cell Using TERS

Maria Wächtler

Quantum confined semiconductor nanostructures in light-driven catalysis

Martin Presselt

Supramolecular Control of Optical and Electronical Properties of Two-Dimensional Dye Layers

Po-Chiao Lin

New Environment Sensitive Fluorophores with Color-Tailored Emission: In Vivo Monitoring of Carbonic Anhydrases Expression on Growth of Larval Zebrafish

Shangjr (Felix) Gwo

Plasmonic Metasurface-Enhanced Linear and Nonlinear Processes in Two-Dimensional Semiconductors

Ta-Jen Yen

Empowering Bilayer MoS2 by Engineered Plasmonic Nanostructures for Optoelectronic Applications

Tiow-Gan Ong

Carbodicarbene, Carbogenic Maverick, Not a Moderate!

Volker Deckert

Plasmon Enhanced Probe Spectroscopies – Structural Investigation of Nanoscale Objects

Yi-Tsu Chan

Molecular self-assembly methodology for rational construction of metallosupramolecules with high structural complexity

Yian Tai

Toward a universal polymeric material for electrode buffer layers in organic optoelectronics

Yu-Chieh Cheng

Kirigami-based soft robots with light-responsive properties

Yu-Jung Lu

Controlling Light-matter Interactions at Nanoscale with Plasmonics: From Spontaneous Emission to Lasing