Revising the role of chromium on the surface of perovskite electrodes: Poison or promoter for the solid oxide electrolysis cell performance?

Publication date: January 2020Source: Journal of Catalysis, Volume 381Author(s): Dingkai Chen, Basma Mewafy, Fotios Paloukis, Liping Zhong, Vasiliki Papaefthimiou, Thierry Dintzer, Kalliopi M. Papazisi, Stella P. Balomenou, Dimitrios Tsiplakides, Detre Teschner, Virginia Pérez-Dieste, Carlos Escudero, Spyridon ZafeiratosAbstractPerovskite materials are typically used as oxygen electrodes of solid oxide fuel and electrolysis cells (SOC). The high stability of the perovskite structure in oxidative environments makes it a good candidate as a cathode electrode for steam electrolysis SOC as well. In this work, we investigate SOC with La0.75Sr0.25Cr0.9Fe0.1O3 perovskite cathodes employing near ambient pressure X-ray photoelectron and near-edge X-ray absorption fine structure spectroscopies combined with online electrochemical measurements. Based on operando experimental evidences the surface state of the perovskite electrode is directly associated with the electrocatalytic performance of the cell. The results indicate that under steam electrolysis operating conditions the well-known Sr surface enrichment is accompanied by Cr segregation and formation of SrCrO4-like oxide. In contrast to the common perception of the role of surface chromites, we show here that its presence does not induce cell deactivation, but on the contrary, is beneficial for cell performance.Graphical abstract
Source: Journal of Catalysis - Category: Chemistry Source Type: research

Related Links:

ConclusionLack of knowledge regarding the causes of death and careless attitude towards the suicidal behavior and, the health and welfare of detainees are avoidable reasons for custody-related deaths.
Source: Journal of Forensic and Legal Medicine - Category: Forensic Medicine Source Type: research
Source: Clinical Toxicology - Category: Toxicology Authors: Source Type: research
BACKGROUND: Hospital-treated deliberate self-poisoning is common, with a median patient age of around 33 years. Clinicians are less familiar with assessing older adults with self-poisoning and little is known about their specific clinical requirements. ...
Source: SafetyLit - Category: International Medicine & Public Health Tags: Age: Elder Adults Source Type: news
We read with interest the recent publication regarding Cycas exposures and would like to raise some concerns [ 1 ]. Retrospective analyses of poison center data are inherently flawed and their misinterpretation may confound the risk assessment and mana...
Source: SafetyLit - Category: International Medicine & Public Health Tags: Jurisprudence, Laws, Legislation, Policies, Rules Source Type: news
Staphylococcus aureus is an important pathogen that is associated with nosocomial infections, as well as food poisoning. This bacterium is resistant to antimicrobial agents and can survive in a wide range of environmental conditions. The aim of this study was to measure the uptake and release of amino acids by S. aureus at mid-exponential and stationary phases of growth following exposure to a combination of conditions including variations in temperature, pH and NaCl. Bacterial cells were grown up to mid-exponential and stationary phases in tryptic soy broth (TSB), where the supernatants were collected for analyses of amin...
Source: Frontiers in Microbiology - Category: Microbiology Source Type: research
Publication date: Available online 22 January 2020Source: Mutation Research/Genetic Toxicology and Environmental MutagenesisAuthor(s): Donna Goodenow, Faith Emmanuel, Chase Berman, Mark Sahyouni, Christine RichardsonAbstractBioflavonoids have a similar chemical structure to etoposide, the well-characterized topoisomerase II (Top2) poison, and evidence shows that they also induce DNA double-strand breaks (DSBs) and promote genome rearrangements. The purpose of this study was to determine the kinetics of bioflavonoid-induced DSB appearance and repair, and their dependence on Top2. Cells were exposed to bioflavonoids individu...
Source: Mutation Research Genetic Toxicology and Environmental Mutagenesis - Category: Genetics & Stem Cells Source Type: research
Authors: Kondo K, Sakata K, Kato R, Sugano Y, Takeuchi S, Sato M Abstract Qualitative real-time PCR method for three poisonous Entoloma rhodopolium-related species in Japan was established using specific primers and FAM, VIC, Texas Red, Cy5-labeled probes. The use of multicolor probes can extend the method to simultaneous detection of different targets. Standard plasmids were constructed as reference materials. Designed primers and probes in the method detect only a target species, and the detection limit was 12.5 copies or below. This indicates it is highly specific and sensitive enough to detect the poisonous mus...
Source: Shokuhin eiseigaku zasshi. Journal of the Food Hygienic Society of Japan - Category: Food Science Tags: Shokuhin Eiseigaku Zasshi Source Type: research
NEW HAVEN, Conn. - A lead-paint poisoning plaintiff on Jan. 9 moved jointly with the city of New Haven in Connecticut state court seeking an extension of time for the plaintiff to reply to the city's motion to dismiss in order to review the case and explore the possibility of a settlement (Nichelle Hobby, et al. v. City of New Haven, No. NHH-CV-19-5003875-S, Conn. Super., New Haven Jud. Dist.).
Source: LexisNexis® Mealey's™ Emerging Toxic Torts Legal News - Category: Medical Law Source Type: news
PURPOSE: To explore neuropathologic mechanisms in functional brain regions in patients with delayed encephalopathy after carbon monoxide poisoning (DEACMP) from the perspective of the brain network nodes by resting-state functional magnetic resonance imagi...
Source: SafetyLit - Category: International Medicine & Public Health Tags: Economics of Injury and Safety, PTSD, Injury Outcomes Source Type: news
[Daily Maverick] Australians may not know and will be unhappy to discover that South African waters are far from pristine, with toxic runoff from factories and farms entering coastal waters. Local sharks are apex predators and, as bioaccumulators, they retain heavy metals such as mercury and arsenic.
Source: AllAfrica News: Health and Medicine - Category: African Health Source Type: news
More News: Chemistry | Chromium | Environmental Health | Poisoning