ACS Engineering Au最新文献

{"title":"Role of Mass Transfer Phenomena in Electrochemical Nitrate Reduction: A Case Study Using Ti and Ag-Modified Ti-Hollow Fiber Electrodes.","authors":"Ainoa Paradelo Rodríguez, Guido Mul, Bastian T Mei","doi":"10.1021/acsengineeringau.4c00035","DOIUrl":"10.1021/acsengineeringau.4c00035","url":null,"abstract":"<p><p>Decentralized electrochemical reduction of nitrate into ammonium is explored as a viable approach to mitigate nitrate accumulation in groundwater. In this study, tubular porous electrodes made of titanium (termed hollow fiber electrodes or HFEs) were successfully modified with silver (Ag) nanoparticles through electrodeposition. Under galvanostatic control and in acidic electrolyte, Ag deposition on Ti HFE resulted in an increase in the Faradaic efficiency for ammonium formation from low concentrations of nitrate (50 mM), but only under reaction conditions of restricted mass transport. For conditions of favorable transport, facilitated by an inert gas flow (Ar) exiting the pores, a higher nitrate conversion but an increase in hydroxylamine selectivity at the expense of the ammonium selectivity are observed for Ti/Ag hollow fiber electrodes. For Ti/Ag electrodes, it is concluded that ammonium formation is prevented by effective removal of surface intermediates. Remarkably, for unmodified Ti hollow fiber electrodes, the Faradaic efficiency to ammonium is significantly improved when operated at high current densities and in conditions of high mass transport. The selectivity to liquid products even surpasses the selectivity of Ti/Ag electrodes. These findings indicate that nitrate reduction to ammonium at Ti and Ti/Ag hollow fiber electrodes can be achieved at comparable rates but under distinctly different process conditions. In fact, for Ti electrodes, operation at a lower applied potential compared to Ti/Ag electrodes is feasible, ultimately resulting in reduced energy consumption. This study thus highlights the importance of controlling the interfacial electrode environment, particularly when comparing and evaluating the effectiveness of electrode materials in electrochemical nitrate reduction. The study also reveals that transport phenomena affect electrode material-dependent activity-selectivity correlations and must be considered in ongoing material development efforts.</p>","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"5 1","pages":"27-35"},"PeriodicalIF":4.3,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11843601/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143484086","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":"Ultrafine Particle Recycling─Efficiency of the Hydrophobic Double Emulsion Technique for the Selective Agglomeration and Froth Flotation of Ultrafine Cathode Catalyst Particles from PEM Water Electrolyzers","authors":"Sohyun Ahn*,&nbsp;Suvarna Patil and Martin Rudolph,&nbsp;","doi":"10.1021/acsengineeringau.4c0004210.1021/acsengineeringau.4c00042","DOIUrl":"https://doi.org/10.1021/acsengineeringau.4c00042https://doi.org/10.1021/acsengineeringau.4c00042","url":null,"abstract":"<p >On account of the use of platinum group metals (PGMs) as active materials in proton exchange membrane water electrolyzer (PEMEL) cells, development of recycling processes for fine catalyst materials is indispensable for further scale-up of hydrogen production. By applying a contrast in (de)wetting ability of the materials, ultrafine particles have the potential to be separated for recycling. The limitation of particle size in froth flotation technology can be overcome by adding oil droplets to the system. This study investigates the selective separation of ultrafine particles by applying hydrophobic high internal phase (HIP) water-in-oil emulsion containing only 5% of organic liquid emulsified as a double emulsion in the particle dispersion. Hydrophobic cathode particles (i.e., carbon black) are selectively agglomerated in this system, allowing 90% of the feed to be recovered in the froth phase. The recovery rate was also significantly higher than that using the same amount of pure oil promoter, kerosene. In the binary particle system, 70% of the target particles are recovered with 90% grade by adding 2.8% hydrophobic double emulsion.</p>","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"5 1","pages":"57–65 57–65"},"PeriodicalIF":4.3,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsengineeringau.4c00042","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143435891","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":"ACS Engineering Au’s Special Issue on “Insights, Innovations, and Intensification” 2024","authors":"Vivek V. Ranade*,&nbsp; and ,&nbsp;Linda J. Broadbelt*,&nbsp;","doi":"10.1021/acsengineeringau.4c0005010.1021/acsengineeringau.4c00050","DOIUrl":"https://doi.org/10.1021/acsengineeringau.4c00050https://doi.org/10.1021/acsengineeringau.4c00050","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"491–492 491–492"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/epdf/10.1021/acsengineeringau.4c00050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142842542","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":"","authors":"Nicolas Chaussard*,&nbsp;Clémence Nikitine and Pascal Fongarland,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsengineeringau.4c00030","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144433029","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":"","authors":"Sakthivel Kogularasu,&nbsp;Balasubramanian Sriram,&nbsp;Sea-Fue Wang,&nbsp;Wan-Ching Lin,&nbsp;Yen-Yi Lee,&nbsp;Yung-Lung Chen* and Guo-Ping Chang-Chien*,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsengineeringau.4c00024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144433031","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":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/egv004i006_1879103","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144391241","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":"","authors":"Vivek V. Ranade*,&nbsp; and ,&nbsp;Linda J. Broadbelt*,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsengineeringau.4c00050","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144433027","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":"","authors":"","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/egv004i006_1879102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144433030","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":"","authors":"Chen Chuan Nathaniel Don Lim,&nbsp;Michelle Jui Hsien Ong,&nbsp;Mingyue Wu,&nbsp;Chi-Lik Ken Lee and Ping Sen Choong*,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsengineeringau.4c00026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144391234","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":"","authors":"Lisa Schulz,&nbsp;Norbert Kockmann and Thorsten Röder*,&nbsp;","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":29804,"journal":{"name":"ACS Engineering Au","volume":"4 6","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":4.3,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsengineeringau.4c00027","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144391239","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}