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Synthesis of Pt-Ni-Cu Nanocages for Efficient Oxygen Reduction Electrocatalysis 高效氧还原电催化用Pt-Ni-Cu纳米笼的合成

Material Sciences Pub Date : 2025-01-01 DOI: 10.12677/ms.2025.154060

磊谢

{"title":"Synthesis of Pt-Ni-Cu Nanocages for Efficient Oxygen Reduction Electrocatalysis","authors":"磊谢","doi":"10.12677/ms.2025.154060","DOIUrl":"https://doi.org/10.12677/ms.2025.154060","url":null,"abstract":"控制Pt基纳米材料的表面、形状和组成可显著提升氧还原反应的催化性能。由超薄纳米片构成的基于Pt的纳米笼，作为一种新型高效催化剂，具有较高的Pt原子利用率。然而，如何通过简单策略设计多金属纳米笼以扩展催化剂的组成空间仍然是一个挑战。在此，我们提出将溶剂热合成法与室温下的保形腐蚀相结合，实现了壁厚仅为7原子层的Pt-Ni-Cu三元纳米笼的合成。此外，通过调控表面活性剂，能有效控制Pt-Ni-Cu三元纳米笼的结构。由于其独特的结构与组成，Pt-Ni-Cu三元纳米笼在氧还原反应(ORR)中展现出优异的质量活性，0.9 V时质量活性为1411 mA·mgPt−1，是商业Pt/C催化剂的9.0倍，优于近期报道的Pt基纳米笼。Controlling the surface, shape, and composition of Pt-based nanomaterials can greatly boost oxygen reduction catalysis. Pt-based nanocages composed of ultrathin nanosheets have emerged as a new class of efficient catalysts with high atomic utilization efficiency of Pt. However, engineering multimetallic nanocages via facile strategies still remains a challenge to extend compositional space for catalyst development. Here, this work achieves the synthesis of Pt-Ni-Cu ternary nanocages with walls as thin as 7 atomic layers, by developing a general strategy that combines the solvothermal synthesis of highly composition segregated nanocrystals with the conformal corrosion at room temperature. In addition, the structure of Pt-Ni-Cu ternary nanocages can be well controlled by simply changing the surfactants. Benefiting from their unique structure and composition, the Pt-Ni-Cu ternary nanocages exhibit superior mass activity towards oxygen reduction reaction (ORR), with a value of 1411 mA·mgPt−1 at 0.9 V, which is 9.0 times higher than that of commercial Pt/C catalyst and outperforms the recently reported Pt-based nanocages.","PeriodicalId":18218,"journal":{"name":"Material Sciences","volume":"15 04","pages":"550-561"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pdf.hanspub.org/ms2025154_31281874.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147883223","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}

引用次数: 0

Preparation of Hollow Hierarchical Porous Carbon Spheres for Electrochemical Performance 中空分层多孔碳球的制备及其电化学性能

Material Sciences Pub Date : 2025-01-01 DOI: 10.12677/ms.2025.156152

俊霖池

{"title":"Preparation of Hollow Hierarchical Porous Carbon Spheres for Electrochemical Performance","authors":"俊霖池","doi":"10.12677/ms.2025.156152","DOIUrl":"https://doi.org/10.12677/ms.2025.156152","url":null,"abstract":"本文以十二烷基硫酸钠(SDS)为软模板剂，D-核糖为碳源，聚(4-苯乙烯磺酸–共聚–马来酸)钠盐(PSSMA)为稳定剂，采用水热炭化和CO2活化方法制备了中空分级多孔炭球，系统考察了其电化学性能。研究表明，SDS和PSSMA发生相互作用形成混合乳液，作为水热反应的中空微反应器。D-核糖在微反应器与水的界面发生水解、聚合和芳构化等过程并形成炭前驱体，经炭化和CO2活化制得微孔、介孔和大孔并存的中空分级多孔炭球。该炭球具有较高的比表面积、中空的球形腔体、分级的孔隙结构和丰富的表面含氧官能团，有利于电解液和离子的存储、浸润和扩散。当CO2活化时间为1 h时，样品(HPC-1)的比表面积为316 m2∙g−1，孔容积为0.19 cm3∙g−1，表面分布着大量羧基(-COOH)和羟基(-OH)等含氧官能团，表现出最佳的电化学性能。以6 mol∙L−1 KOH为电解液，在三电极体系下，当电流密度为0.2 A∙g−1时，比电容为183 F∙g−1；电流密度为5 A∙g−1时进行5000次充放电循环后比电容保持率仍可达96%；二电极体系下，当电流密度为0.1 A∙g−1，比电容为97 F∙g−1，当功率密度为50 W∙kg−1时，能量密度可达3.36 W∙h∙kg−1，表现出良好的应用潜能。 This study employs sodium dodecyl sulfate (SDS) as a soft template agent, D-ribose as a carbon source, and poly(4-styrenesulfonic acid-co-maleic acid) sodium salt (PSSMA) as a stabilizer to prepare hollow hierarchical porous carbon spheres through hydrothermal carbonization and CO2 activation, and investigates their electrochemical performance. The research indicates that SDS and PSSMA interact to form a mixed emulsion, serving as a hollow micro-reactor for the hydrothermal reaction. D-ribose undergoes hydrolysis, polymerization, and aromatization at the interface of the micro-reactor and water, forming a carbon precursor. The resulting hollow hierarchical porous carbon spheres feature the coexistence of micropores, mesopores, and macropores, a high specific surface area, a hollow spherical cavity, a hierarchical pore structure, and abundant oxygen-containing functional groups on the surface, which facilitate the storage, wetting, and diffusion of electrolytes and ions. When the CO2 activation time is 1 h, the sample (HPC-1) exhibits a specific surface area of 316 m2∙g−1, a pore volume of 0.19 cm3∙g−1, and surface oxygen-containing functional groups such as carboxyl (-COOH) and hydroxyl (-OH), demonstrating optimal electrochemical performance. Using 6 mol∙L−1 KOH as the electrolyte, in a three-electrode system, the specific capacitance reaches 183 F∙g−1 at a current density of 0.2 A∙g−1, and after 5000 charge-discharge cycles at 5 A∙g−1, the specific capacitance retention rate remains at 96%. In a two-electrode system, the specific capacitance reaches 97 F∙g−1 at a current density of 0.1 A∙g−1, and at a power density of 50 W∙kg−1, the energy density reaches 3.36 W∙h∙kg−1, showing promising application potential.","PeriodicalId":18218,"journal":{"name":"Material Sciences","volume":"15 06","pages":"1428-1442"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pdf.hanspub.org/ms_1281964.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147914440","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}

引用次数: 0

Preparation and Antibacterial Study of Polycarbonate Propylene Ester/Cellulose Acetate Nanocomposite Membrane 聚碳酸酯丙烯酯/醋酸纤维素纳米复合膜的制备及抗菌性能研究

Material Sciences Pub Date : 2024-01-01 DOI: 10.12677/ms.2024.145082

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