Thermodynamics of Corrosion

Muylder, Jean Van

doi:10.1007/978-1-4757-4825-3_1

Cited by 11 publications

(15 citation statements)

References 83 publications

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“…Time-resolved operando Raman spectroscopy was performed in a customized ow cell to explore the oxidation state evolution of the catalyst surface during CO 2 RR (Supplementary Figs. [10][11]. When the measurement of Cu 2 (OH) 2 CO 3 was conducted at -0.84 V RHE , some areas of the electrode surface gradually changed from the initial turquoise color (the color of Cu 2 (OH) 2 CO 3 nanocrystals) to brown after 90 min of CO 2 RR (Fig.…”

Section: Catalyst Evolution During the Co 2 Rrmentioning

confidence: 99%

Structural evolution and strain generation of derived-Cu catalysts during CO2 electroreduction

Lei

Huang

Yin

et al. 2022

Preprint

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Copper (Cu)-based catalysts generally exhibit high selectivity toward valuable C2+ products during the electrochemical CO2 reduction reaction (CO2RR). However, the origin of this selectivity and the influence of precursor materials on it are not fully understood due to the elusive evolution of catalysts during the CO2RR. We combined operando X-ray diffraction (XRD) and operando Raman spectroscopy to monitor the structural and compositional evolution of three oxidized Cu precursors (Cu2(OH)2CO3, Cu(OH)2, and CuO) during the CO2RR. The results indicated that the three precursors were completely reduced to Cu(0) with similar grain sizes (~ 11 nm) despite their different electroreduction kinetics when delivering their maximum Faradaic efficiencies for C2+ products. The high density of grain boundaries associated with the small grain size explains their significantly enhanced C2+ selectivity (68–73%) compared to bulk Cu (~ 13%). Operando Raman spectroscopy revealed the lack of co-occurrence of CO2RR intermediates and Cu2(OH)2CO3, Cu(OH)2, CuO, or Cu2O, ruling out the involvement of these oxidized Cu species in the CO2RR. Most interestingly, operando XRD indicated that the Cu nanocrystals derived from Cu(OH)2 and Cu2(OH)2CO3 exhibited noticeable tensile strains of 0.43%~0.55% during the in situ electroreduction of precursors, which could not be detected by conventional ex situ XRD. In contrast, Cu nanocrystals derived from CuO were hardly strained. Density functional theory calculations suggested that the tensile strain in Cu lattice is conducive to promoting the overall CO2RR selectivity, which is consistent with the experimental observations. Therefore, the excellent CO2RR performance of some derived Cu catalysts is attributed to the combined effect of the small grain size and lattice strain, both of which are the result of the in situ electroreduction of precursors. The findings, for the first time, establish correlations between Cu precursors, lattice strains, and catalytic behaviors, demonstrating the unique ability of operando characterization techniques in probing catalyst evolution during electrochemical processes.

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Section: Catalyst Evolution During the Co 2 Rrmentioning

confidence: 99%

Structural evolution and strain generation of derived-Cu catalysts during CO2 electroreduction

Lei

Huang

Yin

et al. 2022

Preprint

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“…20 Also, the discharge of coal fly ash leachates into fresh waters has been linked to elevated selenium levels in the tissues of fish. 21 In all of these cases, the major selenium species have been shown to be selenate, Se(VI)O 4 2− and selenite, Se(IV)O 3 2− . This is because of the greater solubility and, therefore, greater mobility of these species.…”

Section: Introductionmentioning

confidence: 99%

“…Of all the selenium species, SeO 3 2− and SeO 4 2− are the only ones that are significantly soluble, with SeO 4 2− being the most soluble; the selenides and elemental selenium are, in comparison, insoluble. 22 Furthermore, SeO 4 2− appears to move freely in aqueous systems, whereas SeO 3 2− is readily adsorbed by amorphous iron hydroxides and aluminum hydroxides. 235 Thus, movement of selenium in the environment depends primarily upon the presence of SeO 4 2− .…”

Section: Introductionmentioning

confidence: 99%

“…1,2 The influence of redox conditions and pH on the speciation of selenium has been well studied. 3,4 Selenium originating in soil historically has been a major concern. Because of its wide occurrence in soils, the equilibria between selenium and other soil components also has been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…22 Furthermore, SeO 4 2− appears to move freely in aqueous systems, whereas SeO 3 2− is readily adsorbed by amorphous iron hydroxides and aluminum hydroxides. 235 Thus, movement of selenium in the environment depends primarily upon the presence of SeO 4 2− . However, the oxidation potential of natural waters favors SeO 3 2− rather than SeO 4 2− in all but the most alkaline of environments.…”

Section: Introductionmentioning

confidence: 99%

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Phase Formation in the System CaO‐SeO2‐H2O

Dumm

Brown

1997

Journal of the American Ceramic Society

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O are the stable calcium selenites. CaSeO 3 ⅐H 2 O exists over the pH range 12.5-3.7, making it the most important phase for natural systems as well as most technological applications. Ca(HSeO 3 ) 2 ⅐H 2 O is the more acidic phase; it exists over the pH range 3.7-0.4. Incongruent dissolution of Ca(HSeO 3 ) 2 ⅐H 2 O forms CaSeO 3 ⅐ H 2 O. These results indicate Ca 2 (HSeO 3 ) 2 (Se 2 O 5 ) is not a s t a b l e p h a s e a t 2 3°C . A t 8 0°C , C a S e O 3 ⅐ H 2 O ,

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Reply to the comments of L. Tomcsanyi on the paper ?influence of the heat treatment in the electrochemical corrosion of Al-Zn-Mg alloys?

Cabot

1995

J Appl Electrochem

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Thermodynamics of Corrosion

Cited by 11 publications

References 83 publications

Structural evolution and strain generation of derived-Cu catalysts during CO2 electroreduction

Structural evolution and strain generation of derived-Cu catalysts during CO2 electroreduction

Phase Formation in the System CaO‐SeO2‐H2O

Reply to the comments of L. Tomcsanyi on the paper ?influence of the heat treatment in the electrochemical corrosion of Al-Zn-Mg alloys?

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