The program is in UTC timeclick here to check your local time.

Program
 
Tue Jun 09 2020
Advances in material design strategies for CO2 electrocatalysis - S1
Chair: Marta Costa Figueiredo
13:00 - 13:05
Abstract not programmed
13:05 - 13:15
Abstract not programmed
13:15 - 13:30
S1-I1
Escudero-Escribano, Maria
Tailored electrochemical interfaces for CO2 electrocatalysis
Escudero-Escribano, Maria
Authors
Maria Escudero-Escribano a
Affiliations
a, University of Copenhagen, -, copenhaguen, 0, DK
Abstract

Tailoring the structure of the electrochemical interface at the atomic and molecular levels can provide very valuable insight to understand and tune the electrocatalytic activity and/or selectivity of renewable energy conversion reactions. Model studies on well-defined interfaces are pivotal to understand the factors controlling both activity and selectivity in electrocatalysis.

The use of renewable electricity to reduce CO2 into clean fuels and chemicals is very promising to convert CO2 into valuable hydrocarbons and alcohols while contributing to close the unbalanced carbon cycle [1,2]. This presentation will summarise some recent strategies aiming to understand the structure-activity-selectivity relations for CO2 and CO electrocatalysis [1]. We have investigated the interfacial properties of Cu single-crystalline electrodes in contact with different electrolytes. We have studied the effect of pH, specific anion adsorption, and potential dependence of interfacial processes on Cu single-crystalline surfaces for CO electroreduction [3]. In phosphate buffer solutions, the adsorption of phosphate anions depends strongly on both the pH and the geometry of the active site. In the presence of CO, phosphate adsorption affects the potential range at which CO poisons the surface. We show how well-defined studies, under potential control, are essential to understand the structure-function relations and, ultimately, to rationally design highly efficient electrocatalysts for CO2 reduction.

13:30 - 13:45
Abstract not programmed
13:45 - 14:00
S1-I2
Buonsanti, Raffaella
Ecole Polytechnique Federale de Lausanne (EPFL)
Shaping and coupling copper nanocrystals to drive selectivity in CO2RR
Buonsanti, Raffaella
Ecole Polytechnique Federale de Lausanne (EPFL), CH

Raffaella Buonsanti obtained her PhD in Nanochemistry in 2010 at the National Nanotechnology Laboratory, University of Salento. Then, she moved to the US where she spent over five years at the Lawrence Berkeley National Laboratory, first as a postdoc and project scientist at the Molecular Foundry and after as a tenure-track staff scientist in the Joint Center for Artificial Photosynthesis. In October 2015 she started as a tenure-track Assistant Professor in the Institute of Chemical Sciences and Engineering at EPFL. She is passionate about materials chemistry, nanocrystals, understanding nucleation and growth mechanisms, energy, chemical transformations.

Authors
Raffaella Buonsanti a
Affiliations
a, EPFL École Polytechnique Fédérale de Lausanne, Department of Chemical Sciences and Engineering, Switzerland, CH
Abstract

Correlating activity, selectivity and stability with the structure and composition of catalysts is crucial to advancing the knowledge in chemical transformations which are essential to move towards a more sustainable economy. Among these, the electrochemical CO2 reduction reaction (CO2RR) holds the promise to close the carbon cycle by storing renewable energies into chemical feedstocks, yet it suffers from the lack of efficient, selective and stable catalysts. Furthermore, fundamental catalytic studies should be complemented with investigations under commercially-relevant conditions to assure actual progress in the field.

In this talk, I will present our recent group efforts towards the synthesis of atomically defined nanocrystals (NCs) via colloidal chemistry and their use as CO2RR catalysts.

First of all, I will illustrate how tailor make copper NCs has helped to reveal synergy between shape and size and the importance of facet ratio in CO2RR. Furthermore, I will show that these relationships hold even when these catalysts are integrated in a gas-fed electrolyzers at technologically relevant conditions with currents up to 300 mA/cm2

I will then provide some examples of hybrid catalysts where copper domains are interfaced with a metallic doman or with a metal oxide doman. Specifically I will focus on Cu-Ag nanodimers, that combine tandem catalysis and electronic effects to promote C-C coupling, and Cu-CeO2 nanodimers, that promote methane formation as a result of ceria reduction and oxygen vacancies formation.

Finally, I will discuss the role of NCs as model systems to study degradation pathways using microscopy tenchiques These insights are essential when moving towards an actual technological implementation.

 

14:00 - 14:15
S1-I3
Smith, Wilson
National Renewable Energy Laboratory, US
To be announced
Smith, Wilson
National Renewable Energy Laboratory, US, US
Authors
Wilson Smith a
Affiliations
a, National Renewable Energy Laboratory, US, Denver West Parkway, 15013, Golden, US
Abstract
14:15 - 14:45
Discussion
14:45 - 15:00
Break
15:00 - 16:30
ePoster Session
 
Thu Jun 11 2020
Oral Session
Chair: Ward van der Stam
13:00 - 13:05
Session-K1
nanoGe, Staff
nanoGe
nanoGe Presentation
nanoGe, Staff
nanoGe, ES
Authors
Staff nanoGe a
Affiliations
a, nanoGe, Carrer de Campoamor, 73 bajo Izq., València, ES
Abstract
13:05 - 13:15
Abstract not programmed
13:15 - 13:35
Session-I1
Mayer, Matthew
Applications of X-ray Spectroscopy for in situ Study of CO2 Conversion Electrocatalysts
Mayer, Matthew
Authors
Matthew Mayer a
Affiliations
a, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany, Berlin, DE
Abstract

Recent developments in electrocatalyst design are revealing new trends in carbon dioxide conversion product selectivity. Various design principles -- such as catalysts based on metal oxides, doped metals or metal alloys, and metal atoms in molecular coordination environments -- demonstrate behaviors which differ from their simple metal counterparts, revealing strategies toward enhancing selectivity toward high-value products while suppressing undesired ones. Continued rational development of catalysts demands that we have a detailed understanding of the structure-function relationships which dictate selectivity. However, under the harsh reaction conditions of CO2 reduction (e.g. highly negative potential, local pH extremes) many of these catalysts are prone to significant structure changes, making it difficult to understand the true catalytically active form of the electrode materials.

X-ray absorption spectroscopy techniques can be uniquely powerful in investigating electrochemical systems under operating conditions. The high energies of X-ray photons enable them to be used under ambient conditions and to pass through liquid electrolyte. Element-specific information can be obtained due to the quantized nature of electronic transitions. A wide range of information can be revealed using X-ray spectroscopy methods, including composition, oxidation states, and local coordination environment. But there are numerous limitations and challenges to successfully investigating an electrochemical system using X-rays, requiring detailed understanding and careful planning. In this talk, I will summarize key concepts of different types of in situ X-ray spectroscopy techniques applied to electrochemical CO2 conversion, with select examples from the literature as well as a case study on our investigation of a bimetallic catalyst using both hard and soft X-ray absorption methods.

13:35 - 13:55
Session-I2
Calle-Vallejo, Federico
Towards Affordable yet Accurate Computational Models for CO2 Electroreduction
Calle-Vallejo, Federico
Authors
Federico Calle-Vallejo a
Affiliations
a, University of Barcelona, Carrer de Martí i Franquès, 1, Barcelona, ES
Abstract

Models based on the computational hydrogen electrode (CHE) [1] have greatly contributed to the discovery and enhancement of electrocatalysts for numerous reactions [2]. Because of its intrinsic complexity, CO2 electroreduction is, so far, a salient exception to the rule [3]. While the shortcomings have traditionally been attributed to the lack of kinetics in CHE-based models, I would also like to point out two thermodynamic factors that limit their accuracy: the presence of systematic errors in the gas-phase molecules simulated with DFT, and the neglecting or insufficient incorporation of solvation effects on the adsorption energies of the reaction intermediates. In my talk, I will show that affordable solutions to those two problems exist that lead to better quantitative agreement with experiments [4]. 

13:55 - 14:15
Session-I3
Burdyny, Thomas
Delft University of Technology, The Netherlands
Interplay of the electrolyte on CO2 reduction selectivity in copper gas-diffusion electrodes
Burdyny, Thomas
Delft University of Technology, The Netherlands, NL
Authors
Thomas Burdyny a
Affiliations
a, Department of Chemical Engineering, Delft University of Technology (TU Delft), The Netherlands, NL
Abstract

An ever-increasing number of works have assessed the activity of CO2 electrolysis on copper catalysts, specifically targeting high selectivities towards multi-carbon products such as ethylene and ethanol. From a catalytic perspective, many works have examined the impact that catalyst morphology and restructuring have on activity. The conditioning of the pre-catalyst, exposed facets and applied potential have continuously been shown to impact not only C2 product formation, but the stability of the catalyst.

 

As part of the 'catalyst', the environment around copper is similarly important. The role of electrolyte pH has been relentlessly assessed both experimentally and theoretically, and has shown to be a dominating factor in CO2 reduction; heavily due to hydrogen evolution maintaining a pH-dependent potential as compared to the pH-independent nature of CO2 to *CO. For these reasons the selectivity of CO2 reduction benefits at higher pH, and has shown large performance differences when using KHCO3, KCl and KOH electrolytes.

 

In this work we describe the impact of changes in the reaction environment at higher current densities for 3 different electrolytes. Specifically, we wanted to understand if the choice of electrolyte was important as it seems when production rate is pushed to the extreme using gas-diffusion electrodes. Through a combined modelling and experimental study we show that 1 M KHCO3, KCl and KOH show identical catalytic performance at 300 mA/cm2. Using experimental data as an input we find that [CO2], [CO], pH and the standard hydrogen potential are similar at higher current densities despite their apparent differences at lower current densities. Such findings help us to consolidate past findings within the field, and begin to better understand the interplay between catalysts, the electrolyte and proximity to a gas-liquid interface.

14:15 - 14:45
Discussion
14:45 - 15:00
Break
15:00 - 16:30
ePoster Session
 
Posters
Simone Asperti, Marilia Pupo, Yaiza Gonzalez-Garcia, Ruud Kortlever
Exploring the role of the copper electrode’s supplier during CO2RR
Jim de Ruiter, Ward van der Stam, Bert Weckhuysen
Searching for the Key to Unlock the Formation of C2+ Hydrocarbons with Operando Vibrational Spectroscopy
Samuel Perry, Samantha Gateman, Richard Malpass-Evans, Neil McKeown, Moritz Wegener, Pāvels Nazarovs, Janine Mauzeroll, Ling Wang, Carlos Ponce de León
Polymers with Intrinsic Microporosity to Enhance CO₂ Reduction to Ethylene
Gaia Neri, Paul Donaldson, Gilberto Teobaldi, Alexander J Cowan
CO2 reduction intermediates with in-situ SFG spectroelectrochemistry
Justus S. Diercks, Maximilian Georgi, Juan Herranz, Alexander Eychmüller, Thomas J. Schmidt
Pd-based nanoparticles and aerogels for the efficient electroreduction of CO2 to added-value products
Kai Han, Peter Ngene, Petra de Jongh
Structure dependent product selectivity for CO2 electroreduction on Zn-based catalysts
Juliana Brito, Marcos Júnior, Maria Zanoni, Lúcia Mascaro
Nanocrystalline CuGaS2-based photoelectrodes for photoelectrocatalytic reduction of CO2
Nihal Guenani, Mariam Barawi, Ignacio J. Villar-García, Víctor A. de la Peña O´Shea, Antonio Guerrero
Ni-Ti Porous electrodes for electrochemical applications
Patricia Corradini, Juliana Brito, Maria Valnice Boldrin, Frank Marken, Lucia Mascaro
Bi-BiVO4 combination for artificial photosynthesis
Bernhard Pribyl-Kranewitter, Alexandra Pătru, Thomas Justus Schmidt
Stability and performance studies of CO2 reduction on silver nanoparticles in bipolar and bipolar-like co-electrolysis systems
Shuang Yang, Hongyu An, Jochem Wijten, Ward Stam, Bert Weckhuysen
Electrochemical Conversion of CO2 to C2H4 and CO at Industrial Waste-derived Bimetallic Cu/Pb Nano-catalysts
Alexander Arndt, Laura Pardo-Perez, Sasho Stojkovikj, Götz Schuck, Lifei Xi, Matthew Mayer
Investigating synergetic effects in SnOx-modified CuOx nanowire array CO2 reduction electrocatalysts by X-ray absorption spectroscopy
Hongyu An, Longfei Wu, Ward van der Stam, Bert Weckhuysen
Time-Resolved In-Situ Surface-Enhanced Raman Spectroscopy (SERS) of CO2 Electrochemical Reduction on Cu
Seyedehbehnaz Varandili, Dragos Stoian, Emad Oveisi, Raffaella Buonsanti
Cu/CeO2 Hybrid Nanocrystals with Tunable Size and Interface Ratio as Electrocatalysts for CO2 Reduction Reaction
Kelly Mayumi Hirota Barbosa, Luan Pereira Camargo, Luiz Henrique Dall´Antonia
Photoelectrochemical reduction of CO2 using Cu2O
Kees Kolmeijer, Longfei Wu, Bert Weckhuysen, Ward Stam van der, Jan Philipp Hofmann, Martha Costa Figueiredo, Emiel Hensen, Sven Arnouts, Sara Bals, Thomas Altantzis
Colloidal Dispersions of CU and Ag Nanoparticles for the Electrocatalytic Reduction of CO2
Piyush Chauhan, Karl Hiekel, Justus S. Diercks, Viktoriia A. Saveleva, Juan Herranz, Alexander Eychmueller, Thomas J. Schmidt
Electrochemical Studies of Gold Aerogels and Commercial Gold-based Catalysts
Francesco Mattarozzi, P. Ngene, P.E. de Jongh
Ligand-free synthesis of Ag nanoparticles on carbon for CO2 electrochemical reduction
We use our own and third party cookies for analysing and measuring usage of our website to improve our services. If you continue browsing, we consider accepting its use. You can check our Cookies Policy in which you will also find how to configure your web browser for the use of cookies. More info