Enhanced Catalytic Activity of Cobalt Porphyrin in CO2 Electroreduction Upon Immobilization on Carbon Materials

Xin-Ming Hu, Magnus H. Rønne, Steen U. Pedersen, Troels Skrydstrup and Kim Daasbjerg doi.org/10.1002/anie.201701104 In a comparative study of the electrocatalytic CO2 reduction, cobalt meso-tetraphenylporphyrin (CoTPP) is used as a model molecular catalyst under both homogeneous and heterogeneous conditions. In the former case, employing N,N-dimethylformamide as solvent, CoTPP performs poorly as an electrocatalyst giving low…

Review: Bipolar electrochemistry—A wireless approach for electrode reactions

Line Koefoed, Steen U. Pedersen and Kim Daasbjerg doi.org/10.1016/j.coelec.2017.02.001 Bipolar electrochemistry involving two feeder electrodes and a conducting object (the bipolar electrode) in an electrolytic solution has attracted a renewed interest in the last two decades due to its use within several fields ranging from materials science to sensing and beyond. The potential difference between…

Electroinduced Intercalation of Tetraalkylammonium Ions at the Interface of Graphene Grown on Copper, Platinum, and Iridium

Dr. Zakaria Salmi, Line Koefoed, Bjarke B. E. Jensen, Antonija Grubišić Čabo, Prof. Philip Hofmann, Prof. Steen U. Pedersen, Prof. Kim Daasbjerg doi.org/10.1002/celc.201600424 Electrochemically driven intercalation of tetraalkylammonium ions can facilitate the delamination of graphene films fabricated by chemical vapour deposition (CVD) from their supporting metal catalyst and, hereby, ease the transfer of the graphene…

Wohl-Ziegler Bromination of Electrografted Films for Optimizing Atom Transfer Radical Polymerization

Stefan Urth Nielsen, Line Koefoed, Henning Lund, Kim Daasbjerg and Steen U. Pedersen doi.org/10.1002/elan.201600208 Electrografting of aryldiazonium compounds to conducting surfaces is extensively used to alter the surface properties. The highly reactive aryl radical is the actual grafting reagent, which on one hand is pertinent for the efficiency of the procedure but, on the other…

Bipolar electrochemistry paper highlighted by Langmuir

On 17th June 2016 our paper “Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry” was highlighted on the Langmuir Facebook page. The editor, Richard M. Crooks states: “What I like about this paper is that it shows the power of bipolar electrochemistry for electrochemically modifying substrates, even when the substrate is not in…

Functionalizing Arrays of Transferred Monolayer Graphene on Insulating Surfaces by Bipolar Electrochemistry

Line Koefoed, Emil Bjerglund Pedersen, Lena Thyssen, Jesper Vinther, Thomas Kristiansen, Steen U. Pedersen, and Kim Daasbjerg doi.org/10.1021/acs.langmuir.6b01309 Development of versatile methods for graphene functionalization is necessary before use in applications such as composites or as catalyst support. In this study, bipolar electrochemistry is used as a wireless functionalization method to graft 4-bromobenzenediazonium on large…

Controlled electropolymerisation of a carbazole-functionalised iron porphyrin electrocatalyst for CO2 reduction

Xin-Ming Hu, Zakaria Salmi, Mie Lillethorup, Emil B. Pedersen, Marc Robert, Steen U. Pedersen, Troels Skrydstrup and Kim Daasbjerg doi.org/10.1039/C6CC00982D Using a one-step electropolymerisation procedure, CO2 absorbing microporous carbazole-functionalised films of iron porphyrins are prepared in a controlled manner. The electrocatalytic reduction of CO2 for these films is investigated to elucidate their efficiency and the origin of their ultimate…

Grafting of Aryl Diazonium, Iodonium, and Sulfonium Salts in Unusual Patterns by Exploiting the Potential Gradient in Bipolar Electrochemistry

Line Koefoed, Steen U. Pedersen and Kim Daasbjerg doi.org/10.1002/celc.201500512 Bipolar electrochemistry makes various kinds of surface modifications possible by appropriately tuning the applied potential difference. In this study aryl diazonium, iodonium, and sulfonium salts are reductively grafted onto gold surfaces using an excess of hydroquinone to set the anode at a fixed potential. In general,…