EES catalysis最新文献

{"title":"Surface amorphization and functionalization of a NiFeOOH electrocatalyst for a robust seawater electrolyzer†","authors":"Hao Wang, Nannan Jiang, Bing Huang, Qiangmin Yu and Lunhui Guan","doi":"10.1039/D4EY00106K","DOIUrl":"10.1039/D4EY00106K","url":null,"abstract":"<p >Hydrogen production of seawater electrolysis has attracted considerable interest due to the abundant seawater resources. However, the chloride ions (Cl<small>⁻</small>) in seawater not only corrode the electrodes but also cause side reactions, severely impacting the electrode efficiency and stability of the oxygen evolution reaction (OER) in seawater electrolysis. These challenges are the key factors limiting the development of seawater electrolysis technology. Here, we developed a surface-functionalized high-performance catalyst, which not only resists Cl<small>⁻</small> corrosion using surface-functionalized ions, but also improves the OER activity by surface amorphization. The designed catalyst (Ru<small>_0.1</small>-NiFeOOH/PO<small>₄</small><small>³⁻</small>) is composed of Ru<small>_0.1</small>-NiFeOOH and surface phosphate. On the one hand, a small amount of Ru doping can increase the surface amorphization of NiFeOOH and thus improve the catalytic activity. On the other hand, the phosphates on Ru<small>_0.1</small>-NiFeOOH are resistant to Cl<small>⁻</small> corrosion, which in turn improves the electrode stability. This catalyst demonstrates robust performance operation over 1000 h in alkaline seawater solutions at an industrial current density of 0.5 A cm<small>⁻²</small>. The anion exchange membrane seawater electrolyzer assembled with Ru<small>_0.1</small>-NiFeOOH/PO<small>₄</small><small>³⁻</small> only needs 1.6 V to achieve 0.5 A cm<small>⁻²</small> when powered by sustainable solar energy. The electrolyzer efficiency is 75.1% at 0.5 A cm<small>⁻²</small>, which is superior to the 2030 technical target of 65% set by the U.S. DOE and most reported work. This work offers a new perspective for designing efficient and stable catalysts and is of great significance for advancing seawater electrolysis technology.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 5","pages":" 1092-1099"},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00106k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Bridging the structural gap of supported vanadium oxides for oxidative dehydrogenation of propane with carbon dioxide†","authors":"Li Wang, Heng-Bo Zhang, Rongrong Hu, Han-Qing Ge, Yong-Hong Song, Guo-Qing Yang, Yuefeng Li, Zhao-Tie Liu and Zhong-Wen Liu","doi":"10.1039/D4EY00094C","DOIUrl":"10.1039/D4EY00094C","url":null,"abstract":"<p >As an extensively used industrial catalyst for oxidation reactions, supported vanadium oxide (VO<small>_<em>x</em></small>) is a promising candidate for oxidative dehydrogenation of propane with carbon dioxide (CO<small>₂</small>-ODP). Although the structure of VO<small>_<em>x</em></small> is found to be a key factor in determining the catalytic activity and stability of supported VO<small>_<em>x</em></small> for CO<small>₂</small>-ODP, the essential reason still remains elusive at the molecular level. To shed some light on this fundamental issue, VO<small>_<em>x</em></small>/(−)SiO<small>₂</small> catalysts with narrow distributions of V loading while well-defined structures of VO<small>_<em>x</em></small> species, <em>i.e.</em>, monomeric VO<small>_<em>x</em></small>, less polymeric VO<small>_<em>x</em></small>, highly polymeric VO<small>_<em>x</em></small> and V<small>₂</small>O<small>₅</small> crystallites, were purposely synthesized by appropriate methods, including one-pot hydrothermal synthesis, incipient wetness impregnation and physical grinding. We found that the catalytic activity and stability of VO<small>_<em>x</em></small> species decrease in the order of monomeric VO<small>_<em>x</em></small> &gt; less polymeric VO<small>_<em>x</em></small> &gt; highly polymeric VO<small>_<em>x</em></small> &gt; crystalline V<small>₂</small>O<small>₅</small>, which coincides with the ability for the re-oxidation of the correspondingly reduced VO<small>_<em>x</em></small> species by CO<small>₂</small>. As a result of the most facile re-oxidation of the reduced monomeric VO<small>_<em>x</em></small> species by CO<small>₂</small>, a well matched redox cycle of V<small>⁵⁺</small>/V<small>⁴⁺</small> oxides during CO<small>₂</small>-ODP can be maintained with increasing the time on stream, leading to an improved stability of the catalyst with more monomeric VO<small>_<em>x</em></small>. These mechanistic findings on the redox properties of VO<small>_<em>x</em></small> with different structures can be guidelines for developing a high-performance VO<small>_<em>x</em></small>-based catalyst for CO<small>₂</small>-ODP.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 5","pages":" 1126-1138"},"PeriodicalIF":0.0,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00094c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Catalytic upgrading of wet waste-derived carboxylic acids to sustainable aviation fuel and chemical feedstocks†","authors":"Jacob H. Miller, Mayadhin Al Abri, Jim Stunkel, Andrew J. Koehler, Matthew R. Wiatrowski, Robert L. McCormick, Gina Fioroni, Jon Luecke, Cheyenne Paeper and Martha Arellano-Treviño","doi":"10.1039/D4EY00087K","DOIUrl":"10.1039/D4EY00087K","url":null,"abstract":"<p >We develop a catalytic process comprising exclusively of flow reactions for conversion of wet waste-derived volatile fatty acids to sustainable aviation fuel (SAF) and key aromatic building blocks (benzene, toluene, ethylbenzene, and xylene; BTEX). Acids are upgraded <em>via</em> sequential ketonization and either cyclization of light (C<small>_3–7</small>) ketones to BTEX and an aromatic SAF blendstock or hydrodeoxygenation of C<small>₈₊</small> ketones to an alkane SAF blendstock. The enabling step investigated in this work is light ketone cyclization over H/ZSM-5, which was chosen through screening upgrading of 4-heptanone over solid acidic and basic catalysts. We then determined the reaction network of 4-heptanone upgrading by analyzing selectivity trends with conversion and concluded that the reaction should be run at full conversion. Finally, we demonstrated the entire acid upgrading process by converting commercial food waste-derived carboxylic acids to SAF blendstocks and BTEX. We blended the C<small>₉₊</small> aromatic and alkane products to create one SAF blendstock and show that this mixture can be blended 50/50 with Jet A and meet all critical property standards. Techno-economic analysis and life cycle assessment show that utilizing a food waste feedstock for the process can be economically feasible with current policy incentives and reduce greenhouse gas emissions by more than 250%.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 5","pages":" 1111-1125"},"PeriodicalIF":0.0,"publicationDate":"2024-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00087k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141507742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic performance of tetraphenylethylene-based porous aromatic frameworks by bandgap adjustment for the synthesis of benzimidazoles†","authors":"He Wang, Xinmeng Xu, Linzhu Cao, Zhenwei Zhang, Jiali Li, Xiaoming Liu, Xin Tao and Guangshan Zhu","doi":"10.1039/D4EY00071D","DOIUrl":"10.1039/D4EY00071D","url":null,"abstract":"<p >Porous aromatic frameworks (PAFs) as visible-light active and reusable photocatalysts provide a green and sustainable alternative to conventional metal-based photocatalysts. In this study, we design and synthesize three novel photoactive tetraphenylethylene (TPE) based PAF photocatalysts (TPE-PAFs) linked with thiophene units in an alternating donor (D)–acceptor (A) fashion. Photoelectrochemical measurements show that the introduction of different thiophene units can effectively regulate the optical band gap and energy level, which may further determine their photocatalytic performance. As a result, TPE-PAFs achieve excellent yields (up to 99%), broad substrate scope and high recyclability (up to 10 cycles) for the photosynthesis of benzimidazoles. The photocatalytic reaction is successfully monitored using <em>in situ</em> IR spectra. This work provides a feasible approach for designing PAFs with high photocatalytic activity and broadens the application of PAFs for photocatalytic organic transformations.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 5","pages":" 1100-1110"},"PeriodicalIF":0.0,"publicationDate":"2024-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00071d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Conversion of diverse post-consumer PVC waste materials to PE via dual catalytic tandem dehydrochlorination–hydrogenation†","authors":"Galahad O’Rourke, Alina Skorynina, Igor Beckers, Sam Van Minnebruggen, Christel Colemonts, Philippe Gabriels, Peter Van der Veken and Dirk De Vos","doi":"10.1039/D4EY00082J","DOIUrl":"10.1039/D4EY00082J","url":null,"abstract":"<p >Chemical recycling of polyvinyl chloride (PVC) waste poses challenges due to its high chloride content and varied additive formulations. We present a dual catalytic system enabling full conversion of post-consumer PVC waste <em>via</em> tandem dehydrochlorination–hydrogenation. Using a ZnCl<small>₂</small> catalyst (0.1–0.2 eq.) for dehydrochlorination and a Ru catalyst (1.0 mol%) for hydrogenation, it directly converts PVC into a lower molecular weight polyethylene (PE)-like polymer. It prevents the problematic formation of polyenes and aromatic char during thermal processing. The system tolerates common additives (<em>e.g.</em> plasticisers and Pb-, Zn- and Ca/Zn-based stabilisers) and effectively dechlorinates materials with high inorganic filler content. The method can process PVC materials with a wide range of <em>M</em><small>_n</small> values (29 000–120 000 g mol<small>⁻¹</small>). Methyl cyclohexanecarboxylate emerges as a suitable solvent for the tandem reaction, thereby producing 100% dechlorinated products with low molar mass averages (<em>M</em><small>_n</small> ∼ 2400 g mol<small>⁻¹</small> and <em>M</em><small>_w</small> ∼ 5000 g mol<small>⁻¹</small>) and allows additive removal. X-ray absorption spectroscopy (XAS) and a study of the reactivity of a model compound elucidate the Ru-catalyst structure and the chain splitting mechanism. This tandem process yields soluble short-chained polymer fragments, facilitating industrial processing and additive removal from chlorinated plastic waste.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 1006-1018"},"PeriodicalIF":0.0,"publicationDate":"2024-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00082j?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141252726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the charge transfer dynamics in 3D–1D nanocomposites over solar driven synergistic selective valorization of lignocellulosic biomass: a new sustainable approach†","authors":"Arpna Jaryal, Ajit Kumar Singh, Shivali Dhingra, Himanshu Bhatt, Manvi Sachdeva, Hirendra N. Ghosh, Arindam Indra and Kamalakannan Kailasam","doi":"10.1039/D4EY00077C","DOIUrl":"10.1039/D4EY00077C","url":null,"abstract":"<p >Photocatalytic redox valorization of lignocellulosic biomass to fine chemicals is in its infancy stages where it can be effectively utilized for sustainable energy conversion. In this direction, an effective 3D–1D (Aeroxide P25 TiO<small>₂</small> and CdS) nanocomposite has been demonstrated to upgrade several biomass-derived platform chemicals (<em>e.g.</em> HMF, FFaL, vanillyl alcohol) in a selective and synergistic redox pathway under visible light irradiation for the first time. The successful utilization of the photocatalytic system resulted in the visible light-driven selective hydrogenation of HMF to BHMF along with the coproduction of H<small>₂</small> without the addition of any reducing agent under natural sunlight. In addition, the simultaneous production of valuable commodity chemical, <em>i.e.</em> vanillin, through oxidation has also been earmarked. The intimate interfacial contact between CdS as a visible light active photocatalyst and P25 TiO<small>₂</small> as an active hydrogenation site assists the facile migration of photogenerated electrons towards P25 TiO<small>₂</small>. The coupling of electrons with <em>in situ</em> generated protons led to 95% yield of BHMF whereas oxidative photogenerated holes yielded 35% vanillin, thus abolishing the need for extra redox additives. The synergistic effect bestowed by the semiconductor heterojunction manifested excellent photoredox activity accompanying strong inter-particle interactions which were thoroughly investigated by employing electrochemical, PL, XPS and transient absorption spectroscopy (TAS). Thus, a new sustainable “biomass-based photo-refinery” and cost-effective low carbon-intensity approach has been elucidated for visible light-based hydrogenation activity of TiO<small>₂</small> unveiling a fabrication strategy of photocatalysts with efficient solar spectrum harvesting.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 1019-1026"},"PeriodicalIF":0.0,"publicationDate":"2024-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00077c?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sulfur-regulated metal–support interaction boosting the hydrogen evolution performance of Ru clusters in seawater at industrial current densities†","authors":"Ranran Tang, Ping Yan, Yitong Zhou and Xin-Yao Yu","doi":"10.1039/D4EY00076E","DOIUrl":"10.1039/D4EY00076E","url":null,"abstract":"<p >Regulating the metal–support interaction (MSI) is an effective strategy to enhance the catalytic activity of electrocatalysts. Herein, taking Ru clusters as an example, we report a hybrid electrocatalyst with ultrafine Ru nanoclusters anchored on sulfur and nitrogen co-doped carbon (Ru/SNC) hollow spheres for efficient hydrogen evolution reaction (HER) in an alkaline electrolyte and real seawater. The optimal Ru/SNC hollow spheres on a glassy carbon electrode exhibit superior HER activity, with small overpotentials of only 12 and 30 mV to reach 10 mA cm<small>⁻²</small> in alkaline media and alkaline real seawater, respectively. When loaded on carbon paper, the Ru/SNC hollow spheres only need small overpotentials of 171 (in alkaline solution) and 205 mV (in alkaline real seawater) to deliver an industrial current density of 1000 mA cm<small>⁻²</small>. Furthermore, the assembled Ru/SNC||RuO<small>₂</small> electrolysis cell displays a high current density of 1000 mA cm<small>⁻²</small> at a cell voltage of 2.3 V and impressive stability up to 100 h at a current density of 1000 mA cm<small>⁻²</small> in alkaline real seawater at an elevated temperature of 80 °C. Density functional theory (DFT) calculations suggest that S-doping can induce a strong MSI between Ru clusters and the carbon support to boost the HER activity and stability. S-doping triggers the downshift of the d-band center, weakening the adsorption of H* on Ru clusters and thereby enhancing the hydrogen spillover.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 932-940"},"PeriodicalIF":0.0,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00076e?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141147657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Operational strategies of pulsed electrolysis to enhance multi-carbon product formation in electrocatalytic CO2 reduction†","authors":"Takashi Ito, Jithu Raj, Tianyu Zhang, Soumyabrata Roy and Jingjie Wu","doi":"10.1039/D4EY00039K","DOIUrl":"10.1039/D4EY00039K","url":null,"abstract":"<p >The electrocatalytic reduction of CO<small>₂</small> offers a promising avenue for converting anthropogenic CO<small>₂</small> into valuable chemical and fuel feedstocks. Copper (Cu) catalysts have shown potential in this regard, yet challenges persist in achieving high selectivity for multi-carbon (C<small>₂₊</small>) products. Pulsed electrolysis, employing alternating anodic and cathodic potentials (<em>E</em><small>_a</small>/<em>E</em><small>_c</small>) or two different cathodic potentials (<em>E</em><small>_c1</small>/<em>E</em><small>_c2</small>), presents a promising approach to modulate activity and selectivity. In this study, we investigate the influence of catalyst morphology and operational strategies on C<small>₂₊</small> product formation using Cu nanoparticles (NPs) and CuO nanowires (NWs) in flow cells. In <em>E</em><small>_a</small>/<em>E</em><small>_c</small> mode, commercial Cu NPs show negligible promotion of C<small>₂₊</small> selectivity while CuO NWs demonstrate enhanced C<small>₂₊</small> selectivity attributed to facile oxidation/redox cycling and grain boundary formation. In contrast, <em>E</em><small>_c1</small>/<em>E</em><small>_c2</small> pulsed electrolysis promotes C<small>₂₊</small> yield across various catalyst morphologies by enhancing CO<small>₂</small> accumulation, pH effect, and supplemental CO utilization. We further extend our investigation to membrane electrode assembly cells, highlighting the potential for scalability and commercialization. Our findings underscore the importance of catalyst morphology and operational strategies in optimizing C<small>₂₊</small> product formation pulsed electrolysis, laying the groundwork for future advancements in CO<small>₂</small> electroreduction technologies.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 997-1005"},"PeriodicalIF":0.0,"publicationDate":"2024-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00039k?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141062748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Variable-valence element doping mediated photogenerated electron trapping for selective oxidation reactions†","authors":"Xia Zhong, Yan Zhao, Lei Li, Xin He, Hui Wang, Xiaodong Zhang and Yi Xie","doi":"10.1039/D4EY00024B","DOIUrl":"10.1039/D4EY00024B","url":null,"abstract":"<p >Photocatalytic selective oxidation provides a green and mild way of producing high-value added chemicals, whose conversion and selectivity are limited by complex oxidation pathways mediated by various reactive radical species. Thus, using photogenerated holes as an oxidant to directly drive these oxidation reactions could overcome the above problems, whereas the simultaneously formed electrons would cause the quenching of holes or the formation of other unfavorable reactive oxygen species that would affect the reaction efficiency. Herein, a variable-valence element doping method was proposed to realize hole-mediated photocatalytic selective oxidation. By taking Cu-doped Bi<small>₂</small>WO<small>₆</small> as a typical prototype, we show that the doped Cu element with monovalent and divalent character can effectively trap photogenerated electrons, thereby boosting hole accumulation for selective oxidation reactions. As expected, Cu-doped Bi<small>₂</small>WO<small>₆</small> exhibited excellent catalytic performances in oxidative coupling of benzylamines. This study provides a perspective on optimizing selective oxidation by hole regulation.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 980-986"},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00024b?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140798511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Toward understanding CO oxidation on high-entropy alloy electrocatalysts†","authors":"María Paula Salinas-Quezada, Jack K. Pedersen, Paula Sebastián-Pascual, Ib Chorkendorff, Krishanu Biswas, Jan Rossmeisl and María Escudero-Escribano","doi":"10.1039/D4EY00023D","DOIUrl":"10.1039/D4EY00023D","url":null,"abstract":"<p >Understanding the catalytic activity of high-entropy alloys (HEAs) toward the conversion of small molecules such as carbon monoxide (CO) can provide insight into their structure–property relations. The identification of specific descriptors that govern the CO oxidation on HEAs is crucial to design new materials with customized compositions and structures. Herein, we have rationally assessed the CO oxidation mechanism on an extended AgAuCuPdPt HEA electrocatalyst under an acidic electrolyte. We compare the HEA performance with respect to platinum (Pt), palladium (Pd), and gold (Au) monometallic surfaces for CO oxidation. We also evaluated the same reaction on a binary AuPd alloy and a quaternary AuCuPdPt polycrystalline alloy with the aim of understanding the surface composition effects of the HEA. To provide insights into the descriptors controlling the CO oxidation mechanism and overpotential of the different alloy chemistry, we have combined cyclic voltammetry, surface-sensitive characterisation techniques and density functional theory (DFT) simulations. We show that silver (Ag) can improve the catalytic oxidation of CO by perturbing the *OH adsorption energy of Pd, leading to a lower onset potential. Additionally, we observed that Au segregates on the surface and that Cu is not stable at high applied potentials after CO oxidation. We highlight that HEA electrocatalysts are a valuable platform for designing more active and selective electrocatalyst surfaces.</p>","PeriodicalId":72877,"journal":{"name":"EES catalysis","volume":" 4","pages":" 941-952"},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.rsc.org/en/content/articlepdf/2024/ey/d4ey00023d?page=search","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140798453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}