FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2012316265> ?p ?o ?g. }

• W2012316265 endingPage "53" @default.
• W2012316265 startingPage "42" @default.
• W2012316265 abstract "Pyrite is an abundant mineral, and its dissolution is important in the formation of acid mine drainage and the extraction of metals. It has also been considered as a candidate material for electrochemical solar cells. We studied the anodic processes on pyrite in hydrochloric acid. The current–voltage curve at steady state has three regions. At potentials below 0.6 V, the current is low, and the Tafel slope is high; between 0.6 and 0.9 V, the current is significant, and the Tafel slope is 0.082 V/decade; at potentials above 0.9 V, the current remains high, but the Tafel slope changes to 0.430 V/decade. From careful measurements of the dissolution of pyrite by chlorine, we show that this third region is due to charge transfer and not ohmic resistance. The shape of the current–voltage curve is unaffected by the type of acid used. The effect of temperature was measured, and the activation energies for the middle and upper region are 46 and 105 kJ/mol, respectively. The steady-state current–voltage curves are not affected by the concentration of HCl, but are affected by the concentration of chloride ions, with an order of reaction of − 0.1, indicating that the rate only slightly dependent on chloride ions. Pretreatment tests and XPS analysis of the surface confirm that the change in Tafel slope is not due to the formation of a surface coating or oxidation product. A comprehensive model of the anodic dissolution of pyrite that describes the current–voltage behavior of pyrite over the entire anodic region is proposed. At low potentials, the behavior of pyrite is typical of an n-type semiconductor with some dissolution. However, as the potential is increased, the Fermi level overlaps with an intrinsic surface state. The rate of dissolution of the pyrite in this region is dependent on the occupancy of the surface state. This accounts for previous reports indicating that pyrite is quasi-metallic. The rate-determining step is the transfer of charge across the space-charge layer. As the potential is increased to about 0.9 V, the surface state is unoccupied, and the rate-determining step changes to the transfer of ions across the Helmholtz layer. An expression based on this model fits the experimental data. An important feature of this model is that it also explains two contradictory features of pyrite electrochemistry. On the one hand, n-type and p-type pyrite samples may have similar kinetic parameters, which suggests that the electronic structure of pyrite makes little difference. On the other hand, illuminating the sample with light increases the rate of dissolution, which suggests that the electronic structure is important. The proposed model based on surface states explains these seemingly contradictory observations." @default.
• W2012316265 created "2016-06-24" @default.
• W2012316265 creator A5047123863 @default.
• W2012316265 creator A5066963645 @default.
• W2012316265 date "2014-03-01" @default.
• W2012316265 modified "2023-10-16" @default.
• W2012316265 title "The anodic dissolution of pyrite (FeS2) in hydrochloric acid solutions" @default.
• W2012316265 cites W1488986056 @default.
• W2012316265 cites W1554987460 @default.
• W2012316265 cites W1931325177 @default.
• W2012316265 cites W1937330857 @default.
• W2012316265 cites W1956951185 @default.
• W2012316265 cites W1963802847 @default.
• W2012316265 cites W1972769514 @default.
• W2012316265 cites W1973000062 @default.
• W2012316265 cites W1979292522 @default.
• W2012316265 cites W1980414579 @default.
• W2012316265 cites W1985097572 @default.
• W2012316265 cites W1985657362 @default.
• W2012316265 cites W1987206961 @default.
• W2012316265 cites W1997416293 @default.
• W2012316265 cites W2005758842 @default.
• W2012316265 cites W2010577240 @default.
• W2012316265 cites W2011465434 @default.
• W2012316265 cites W2017183467 @default.
• W2012316265 cites W2017959118 @default.
• W2012316265 cites W2022265686 @default.
• W2012316265 cites W2032597963 @default.
• W2012316265 cites W2033188759 @default.
• W2012316265 cites W2036721931 @default.
• W2012316265 cites W2037350218 @default.
• W2012316265 cites W2041045881 @default.
• W2012316265 cites W2044916637 @default.
• W2012316265 cites W2057826037 @default.
• W2012316265 cites W2058930597 @default.
• W2012316265 cites W2062945604 @default.
• W2012316265 cites W2063412593 @default.
• W2012316265 cites W2065134871 @default.
• W2012316265 cites W2065399080 @default.
• W2012316265 cites W2069742136 @default.
• W2012316265 cites W2080220251 @default.
• W2012316265 cites W2080398208 @default.
• W2012316265 cites W2082976109 @default.
• W2012316265 cites W2083245885 @default.
• W2012316265 cites W2085532095 @default.
• W2012316265 cites W2103466221 @default.
• W2012316265 cites W2111117186 @default.
• W2012316265 cites W2134658747 @default.
• W2012316265 cites W2145276285 @default.
• W2012316265 cites W2148439764 @default.
• W2012316265 cites W2160422975 @default.
• W2012316265 cites W2162523543 @default.
• W2012316265 cites W2165074737 @default.
• W2012316265 cites W2167501613 @default.
• W2012316265 cites W2949539574 @default.
• W2012316265 cites W2951864869 @default.
• W2012316265 cites W3005512649 @default.
• W2012316265 doi "https://doi.org/10.1016/j.hydromet.2014.01.005" @default.
• W2012316265 hasPublicationYear "2014" @default.
• W2012316265 type Work @default.
• W2012316265 sameAs 2012316265 @default.
• W2012316265 citedByCount "39" @default.
• W2012316265 countsByYear W20123162652015 @default.
• W2012316265 countsByYear W20123162652016 @default.
• W2012316265 countsByYear W20123162652017 @default.
• W2012316265 countsByYear W20123162652018 @default.
• W2012316265 countsByYear W20123162652019 @default.
• W2012316265 countsByYear W20123162652020 @default.
• W2012316265 countsByYear W20123162652021 @default.
• W2012316265 countsByYear W20123162652022 @default.
• W2012316265 countsByYear W20123162652023 @default.
• W2012316265 crossrefType "journal-article" @default.
• W2012316265 hasAuthorship W2012316265A5047123863 @default.
• W2012316265 hasAuthorship W2012316265A5066963645 @default.
• W2012316265 hasConcept C107872376 @default.
• W2012316265 hasConcept C113196181 @default.
• W2012316265 hasConcept C147789679 @default.
• W2012316265 hasConcept C172404476 @default.
• W2012316265 hasConcept C17525397 @default.
• W2012316265 hasConcept C178790620 @default.
• W2012316265 hasConcept C179104552 @default.
• W2012316265 hasConcept C185592680 @default.
• W2012316265 hasConcept C199289684 @default.
• W2012316265 hasConcept C2776062231 @default.
• W2012316265 hasConcept C2777436746 @default.
• W2012316265 hasConcept C2778695967 @default.
• W2012316265 hasConcept C52859227 @default.
• W2012316265 hasConcept C88380143 @default.
• W2012316265 hasConcept C89395315 @default.
• W2012316265 hasConceptScore W2012316265C107872376 @default.
• W2012316265 hasConceptScore W2012316265C113196181 @default.
• W2012316265 hasConceptScore W2012316265C147789679 @default.
• W2012316265 hasConceptScore W2012316265C172404476 @default.
• W2012316265 hasConceptScore W2012316265C17525397 @default.
• W2012316265 hasConceptScore W2012316265C178790620 @default.
• W2012316265 hasConceptScore W2012316265C179104552 @default.
• W2012316265 hasConceptScore W2012316265C185592680 @default.
• W2012316265 hasConceptScore W2012316265C199289684 @default.

• next