Johnson Matthey Technology Review最新文献_第9页

Development of New Mixed-Metal Ruthenium and Iridium Oxides as Electrocatalysts for Oxygen Evolution 新型混合金属钌铱氧化物析氧电催化剂的研制

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651322x16529612227119

Jasmine A. Clayton, R. Walton

{"title":"Development of New Mixed-Metal Ruthenium and Iridium Oxides as Electrocatalysts for Oxygen Evolution","authors":"Jasmine A. Clayton, R. Walton","doi":"10.1595/205651322x16529612227119","DOIUrl":"https://doi.org/10.1595/205651322x16529612227119","url":null,"abstract":"We review recent research into oxides of platinum-group metals (PGMs), in particular those of ruthenium and iridium, for use as electrocatalysts for the oxygen evolution reaction. These are used in membrane electrode assemblies in devices such as electrolysers, for water splitting to generate hydrogen as fuel, and in fuel cells where they provide a buffer against carbon corrosion. In these situations, proton-exchange membrane layers are used, and highly acid-resilient electrocatalyst materials are required. The range of structure types investigated includes perovskites, pyrochlores and hexagonal perovskite-like phases, where the PGM is partnered by base metals in complex chemical compositions. The role of chemical synthesis in the discovery of new oxide compositions is emphasised, particularly to yield powders for processing into membrane electrode assemblies. We highlight emerging work that shows how leaching of the base metals from the multinary compositions occurs during operation to yield active PGM-oxide phases, and how attempts to correlate stability with crystal structure have been made. Implications of these discoveries for the balance of activity and stability needed for effective electrocatalysis in real devices are discussed.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67351191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Additive Manufacturing of Platinum Alloys 铂合金的增材制造

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651323x16691084445762

U. E. Klotz, Frank R. König

{"title":"Additive Manufacturing of Platinum Alloys","authors":"U. E. Klotz, Frank R. König","doi":"10.1595/205651323x16691084445762","DOIUrl":"https://doi.org/10.1595/205651323x16691084445762","url":null,"abstract":"Additive manufacturing of jewellery alloys has been actively investigated during the last 10 years. Several, but limited studies have been conducted on gold and platinum jewellery alloys. Platinum is of increased interest due to the technological challenges in investment casting. In the present paper, typical platinum jewellery alloys have been tested by laser track experiments on sheet materials. The effect of alloy composition on width and depth of the laser tracks was studied by metallography. Optimum parameters of the LPBF process were determined for a typical 950Pt jewellery alloy by the preparation of dedicated test samples. Densities of >99.8% were reached for a wide range of processing parameters. However, in case of real jewellery parts the resulting density was found to depend significantly on the part geometry and on the chosen support structure. The supports have to take into account the geometrical orientation of the part relative to the laser build direction and the orientation on the build plate. Local overheating gives rise to porosity in these areas. Therefore, the supports play an important role in the thermal management and have to be optimized for each part. The design of suitable supports was successfully demonstrated for a typical jewellery ring sample.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67351593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Innovative Emissions Measurement and Perspective on Future Tailpipe Regulation 创新排放测量及对未来尾气排放监管的展望

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651323x16650512926820

N. Molden

引用次数: 0

Hydrogen Storage and Transportation Technologies to Enable the Hydrogen Economy: Liquid Organic Hydrogen Carriers 实现氢经济的氢储存和运输技术:液态有机氢载体

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651322x16415717819428

Emma Southall, L. Lukashuk

引用次数: 4

Perspective on the Criticality of Palladium in Organic Synthesis 钯在有机合成中的临界性展望

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651323x16698159435925

Emma R. Schofield

引用次数: 1

Unlocking Scientific Knowledge with Statistical Tools in JMP® 解锁科学知识与统计工具在JMP®

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651322x16445719154043

Pilar Gómez Jiménez, A. Fish, Cristina Estruch Bosch

引用次数: 1

Guest Editorial: Recover, Renew, Reimagine – Industrial Decarbonisation 嘉宾评论:恢复、更新、重新构想——工业脱碳

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651322x16545305867699

M. Danks

引用次数: 0

Enhancing Microbial Electron Transfer Through Synthetic Biology and Biohybrid Approaches 通过合成生物学和生物杂交方法增强微生物电子传递

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651322x16548607638938

Benjamin Myers, P. Hill, F. Rawson, K. Kovács

{"title":"Enhancing Microbial Electron Transfer Through Synthetic Biology and Biohybrid Approaches","authors":"Benjamin Myers, P. Hill, F. Rawson, K. Kovács","doi":"10.1595/205651322x16548607638938","DOIUrl":"https://doi.org/10.1595/205651322x16548607638938","url":null,"abstract":"Traditional microbial synthesis of chemicals and fuels often rely on energy-rich feedstocks such as glucose, raising ethical concerns as they are directly competing with the food supply. Therefore, it is imperative to develop novel processes that rely on cheap, sustainable, and abundant resources whilst providing carbon circularity. Microbial Electrochemical Technologies (MET) offer unique opportunities to facilitate the conversion of chemicals to electrical energy or vice-versa, by harnessing the metabolic processes of bacteria to valorise a range of waste products, including greenhouse gases (GHS). However, the strict growth and nutrient requirements of industrially relevant bacteria, combined with low efficiencies of native extracellular electron transfer mechanisms (EET) reduce the potential for industrial scalability. In this work, we review the most significant advancements in techniques aimed at improving and modulating the efficiency of microbial EET, giving an objective and balanced view of current controversies surrounding the physiology of microbial electron transfer, alongside the methods used to wire microbial redox centres with the electrodes of bioelectrochemical systems via conductive nanomaterials. The EET rates achieved via biological and biohybrid approaches will be compared and the limitations of the two approaches described below.","PeriodicalId":14807,"journal":{"name":"Johnson Matthey Technology Review","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67351292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Step-Change Improvements in Traceable Process Control Thermometry 可追溯过程控制测温的阶跃变化改进

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651323x16601466421853

J. Pearce, D. Tucker, R. Veltcheva, G. Machin

引用次数: 0

Corrosion Testing for Risk Reduction in Chemical Process Development 化学工艺开发中降低风险的腐蚀试验

IF 2.3 4区化学

Johnson Matthey Technology Review Pub Date : 2022-01-01 DOI: 10.1595/205651323x16558250232509

Jarle Holt, K. Atkins, S. Shapcott

引用次数: 0