{"id":34011,"date":"2025-02-16T21:49:20","date_gmt":"2025-02-16T20:49:20","guid":{"rendered":"https:\/\/www.co2news.sk\/?p=34011"},"modified":"2025-02-18T09:38:09","modified_gmt":"2025-02-18T08:38:09","slug":"an-artificial-leaf-that-converts-carbon-into-sustainable-fuels","status":"publish","type":"post","link":"https:\/\/www.co2news.sk\/en\/2025\/02\/16\/an-artificial-leaf-that-converts-carbon-into-sustainable-fuels\/","title":{"rendered":"An &#039;artificial leaf&#039; that converts carbon into sustainable fuels"},"content":{"rendered":"<p><span style=\"color: #0000ff;\"><a href=\"https:\/\/www.nature.com\/articles\/s41929-025-01292-y.pdf\" target=\"_blank\" rel=\"noopener\">Research work<\/a><\/span>\u00a0 demonstrates photoelectrochemical (PEC) synthesis of hydrocarbons by coupling a structured copper nanoflower catalyst with a high photovoltage perovskite light absorber.<!--more--><\/p>\n<ul>\n<li><strong>Geometric surfaces<\/strong> a <strong>local current densities<\/strong> are key to management <strong>C2 hydrocarbon selectivity<\/strong>.<\/li>\n<li>Unassisted perovskite-silicon PEC devices coupling aqueous CO2 reduction with glycerol oxidation achieve <strong>Faradaic yields of ethane and ethylene between 5 % and 10 %<\/strong>, which corresponds to the optimal selectivity observed for copper nanoflower electrodes.<\/li>\n<\/ul>\n<p><strong>PEC systems offer a sustainable alternative<\/strong> for the direct production of C2 hydrocarbons from small building blocks such as CO2 or H2O.<\/p>\n<ul>\n<li>These systems integrate light harvesting and catalysis into a single panel that operates under harmless conditions.<\/li>\n<li>This reduces intermediate steps and CO2 emissions from industrial processes.<\/li>\n<\/ul>\n<p><strong>Research has demonstrated that tandem devices with robust BiVO4 and TiO2 photoanodes couple ethane and ethylene production with O2 evolution<\/strong>.<\/p>\n<ul>\n<li>The partial current densities of C2 were improved 200-fold by interfacing perovskite photocathodes with Si photoanodes for GOR.<\/li>\n<li>This provides a proof-of-concept demonstration for simultaneous PEC synthesis of hydrocarbons and organic synthesis.<\/li>\n<\/ul>\n<p><strong>Optimized copper nanoflower (CuNF) electrocatalyst was used for CO2 reduction<\/strong> based on its promising activity towards ethylene synthesis.<\/p>\n<ul>\n<li>The catalyst consisted of 2\u20134 \u00b5m wide clusters that preserved the 50 nm thin nanoplatelet structure of CuO.<\/li>\n<li>Such hierarchical, porous structures are known to promote CO2 reduction by increasing local pH and thus reducing proton availability for competing H2 evolution.<\/li>\n<\/ul>\n<p><strong>It was found that the C2 selectivity of integrated photocathodes strongly depends on the geometric area of the catalyst<\/strong>.<\/p>\n<ul>\n<li>Optimal selectivity towards ethane and ethylene production was obtained for an active catalyst area of ~4 mm2.<\/li>\n<li>The finding suggests that current density affects selectivity.<\/li>\n<\/ul>\n<p><strong>Photocathodes tested at different applied potentials also followed similar trends in the FY of C2 hydrocarbon products as the dark CuNF electrodes.<\/strong>.<\/p>\n<p><strong>To overcome the thermodynamic limitations of water oxidation, perovskite photocathodes were interfaced with Si photoanodes for GOR.<\/strong>.<\/p>\n<ul>\n<li>The Sip-PVK|CuNF and SiNW-PVK|CuNF devices exhibited similar selectivities and initial photocurrents.<\/li>\n<li>The partial C2 current densities of SiNW-PVK|CuNF (4 mm2) devices reached 155 \u00b5A cm\u22122, representing a 200-fold improvement over perovskite-BiVO4 artificial sheets coupling C2 hydrocarbon production with water oxidation.<\/li>\n<\/ul>\n<p>In conclusion, this work demonstrates the versatility of integrated PEC systems for multicarbon synthesis and conversion of biomass waste into value-added products. <em><strong>Spring<\/strong><\/em><\/p>\n<hr \/>\n<p><strong>Glossary of Key Terms<\/strong><\/p>\n<ul>\n<li><strong>Photoelectrochemical (PEC) synthesis:<\/strong> A process for direct fuel synthesis using solar energy that combines light absorption and catalysis.<\/li>\n<li><strong>Perovskites:<\/strong> Semiconductor materials that exhibit high light absorption and photovoltaic properties.<\/li>\n<li><strong>Faradaic Yield (FY):<\/strong> The efficiency with which electrons transferred in an electrochemical reaction lead to the formation of a specific product. Expressed as a percentage.<\/li>\n<li><strong>Overpotential:<\/strong> The additional potential required beyond the thermodynamic potential to carry out an electrochemical reaction at a significant rate.<\/li>\n<li><strong>Reversible Hydrogen Electrode (RHE):<\/strong> A standard reference electrode used in electrochemistry, especially in the study of hydrogen-related reactions.<\/li>\n<li><strong>Copper Nanoflower (CuNF):<\/strong> A structured copper-based catalyst that exhibits high activity in CO2 reduction.<\/li>\n<li><strong>Glycerol Oxidation Reaction (GOR):<\/strong> An alternative anodic reaction to the oxygen evolution reaction, in which glycerol is oxidized to valuable chemicals, thereby reducing the overall potential required for the PEC process.<\/li>\n<li><strong>BiVO4:<\/strong> Bismuth vanadate, a semiconductor material used as a photoanode for the oxygen evolution reaction.<\/li>\n<li><strong>TiO2:<\/strong> Titanium dioxide, a semiconductor material used as a photoanode.<\/li>\n<li><strong>Photoanode:<\/strong> The electrode in an electrochemical cell where light-driven oxidation takes place.<\/li>\n<li><strong>Photocathode:<\/strong> The electrode in an electrochemical cell where light-driven reduction takes place.<\/li>\n<li><strong>Si nanowire (SiNW):<\/strong> Silicon nanowire used as a photoanode for glycerol oxidation.<\/li>\n<li><strong>Bipolar membrane:<\/strong> A membrane used to separate the anode and cathode compartments that only transmits proton or hydroxyl ions.<\/li>\n<li><strong>Current density:<\/strong> The amount of current per unit area of the electrode, typically expressed in mA cm-2.<\/li>\n<li><strong>Electrocatalysis:<\/strong> Catalysis of electrochemical reactions, usually on the surface of an electrode.<\/li>\n<li><strong>PEC tandem device:<\/strong> A device consisting of a photocathode and a photoanode, interconnected to perform an overall reaction, such as CO2 reduction and water\/glycerol oxidation.<\/li>\n<li><strong>Open-circuit voltage (VOC):<\/strong> The voltage difference between the terminals of a device when it is not connected to any external circuit.<\/li>\n<li><strong>Short-circuit current (ISC):<\/strong> The amount of current produced by a device when the terminals are connected together.<\/li>\n<li><strong>Fill factor (FF):<\/strong> A parameter that evaluates the quality and efficiency of a solar cell.<\/li>\n<li><strong>AM1.5G:<\/strong> Standard solar spectrum used in testing solar devices.<\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>The research work demonstrates photoelectrochemical (PEC) synthesis of hydrocarbons by coupling a structured copper nanoflower catalyst with a high photovoltage perovskite light absorber.<\/p>","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-34011","post","type-post","status-publish","format-standard","hentry","category-znizovanie_co2_cdr_ccs_ccu_dac"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts\/34011","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/comments?post=34011"}],"version-history":[{"count":0,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/posts\/34011\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/media?parent=34011"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/categories?post=34011"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.co2news.sk\/en\/wp-json\/wp\/v2\/tags?post=34011"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}