Multifunctional photoelectroactive platform for CO2 reduction toward C2+ products-programmable selectivity with a bioinspired polymer coating

0552632 - ÚMCH 2023 RIV US eng J - Journal Article
Děkanovský, L. - Plutnar, J. - Šturala, J. - Brus, Jiří - Kosina, J. - Azadmanjiri, J. - Sedmidubský, D. - Sofer, Z. - Khezri, B.
Multifunctional photoelectroactive platform for CO2 reduction toward C2+ products-programmable selectivity with a bioinspired polymer coating.
ACS Catalysis. Roč. 12, č. 2 (2022), s. 1558-1571. ISSN 2155-5435. E-ISSN 2155-5435
Institutional support: RVO:61389013
Keywords : CO2 reduction * electrochemical * photoelectrochemical
OECD category: Polymer science
Impact factor: 12.9, year: 2022
Method of publishing: Limited access
https://pubs.acs.org/doi/10.1021/acscatal.1c03629

In recent years, CO2 photo/electroreduction has received great attention due to the urges and concerns to solve problems connected with global warming, for example, reducing the consumption of fossil fuels as energy sources and switching to renewable energy sources. The realization of this technology depends on efficient photo/electrocatalysts with high selectivity for the products. Herein, we report a programmable, bifunctional, scalable, high-performance, and low-cost bioinspired catalyst for photo/electrochemical CO2 reduction (P/EC-R). We synthesized hydroxyapatite (HAP) needle-like nanoparticles coated with a functional polydopamine polymer (HAP/P(DOPA)) and then modified them with copper nanoparticles (HAP/P(DOPA)/Cu NPs). It was expected that HAP and P(DOPA), due to their plentiful functional groups such as hydroxyl (−OH–), oxygen (−O•– and ═O), and amines (−NH2 and −NH−), provide extensive active catalytic sites, participate in the capture, maintenance, and hydrogenation of the CO2 intermediate, and offer a combination of efficient electrical conduction and photoactivity and synergistic effect together with Cu nanoparticles, thus potentially empowering CO2 P/EC-R. Interestingly, varying the polymerization time of the coating layer (P(DOPA)) leads to different product selectivities in both photoelectrochemical and electrochemical reactions. In a shorter polymerization period (2 h), CO (>83%) is the main product, while for 5 and 15 h, C2H6 (>70%) and CH4 (>74%) are the main products, respectively. It is noteworthy to mention that as the applied potential increased (>−1.2 V vs RHE), propanal (C3H6O, FE > 35%) and surprisingly ethyl acetate (C4H8O2, FE > 67%) have been detected. This is the first report on the C4 product.
Permanent Link: http://hdl.handle.net/11104/0327965