Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions
Samo za registrovane korisnike
1997
Članak u časopisu (Objavljena verzija)
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Using the rotating ring-disk technique (RRDPt(hkl)E), the oxygen-reduction reaction (ORR) was studied in sulfuric acid solution over the temperature range 298-333 K. At the same temperature, the exchange current density increased in the order, i(111)(0) lt i(100)(0) lt i(110)(0) which gives the order of absolute kinetic activities of Pt(hkl) in 0.05 mol/L H2SO4:Pt(111) lt Pt(100) lt Pt(110). We found that at high current densities every crystal face has an ideally temperature-dependent Tafel slope, i.e., -2 x 2.3(RT/F). The activation energy for the ORR is independent of the surface geometry, Delta H-hkl(#) = 42 kJ/mol. The insensitivity of the activation energy to surface structure implies that the reaction pathway for the ORR is the same on all three single-crystal faces. A "series" pathway for the ORR was proposed, with the first electron transfer being the rate-determining step. The structure sensitivity in the kinetics of the ORR on Pt(hkl) is attributed to the structure-sensitive... adsorption of bisulfate and hydroxyl anions and a simple site-blocking effect of these adsorbed anions on the rate of the ORR.
Ključne reči:
platinum single crystals / oxygen reduction / peroxide reduction / temperature effects / activation energyIzvor:
Canadian Journal of Chemistry-Revue Canadienne De Chimie, 1997, 75, 11, 1465-1471Izdavač:
- Natl Research Council Canada, Ottawa
DOI: 10.1139/v97-176
ISSN: 0008-4042
WoS: 000071518100005
Scopus: 2-s2.0-0031269191
Institucija/grupa
Tehnološko-metalurški fakultetTY - JOUR AU - Grgur, Branimir AU - Marković, NM AU - Ross, PN PY - 1997 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/148 AB - Using the rotating ring-disk technique (RRDPt(hkl)E), the oxygen-reduction reaction (ORR) was studied in sulfuric acid solution over the temperature range 298-333 K. At the same temperature, the exchange current density increased in the order, i(111)(0) lt i(100)(0) lt i(110)(0) which gives the order of absolute kinetic activities of Pt(hkl) in 0.05 mol/L H2SO4:Pt(111) lt Pt(100) lt Pt(110). We found that at high current densities every crystal face has an ideally temperature-dependent Tafel slope, i.e., -2 x 2.3(RT/F). The activation energy for the ORR is independent of the surface geometry, Delta H-hkl(#) = 42 kJ/mol. The insensitivity of the activation energy to surface structure implies that the reaction pathway for the ORR is the same on all three single-crystal faces. A "series" pathway for the ORR was proposed, with the first electron transfer being the rate-determining step. The structure sensitivity in the kinetics of the ORR on Pt(hkl) is attributed to the structure-sensitive adsorption of bisulfate and hydroxyl anions and a simple site-blocking effect of these adsorbed anions on the rate of the ORR. PB - Natl Research Council Canada, Ottawa T2 - Canadian Journal of Chemistry-Revue Canadienne De Chimie T1 - Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions EP - 1471 IS - 11 SP - 1465 VL - 75 DO - 10.1139/v97-176 ER -
@article{ author = "Grgur, Branimir and Marković, NM and Ross, PN", year = "1997", abstract = "Using the rotating ring-disk technique (RRDPt(hkl)E), the oxygen-reduction reaction (ORR) was studied in sulfuric acid solution over the temperature range 298-333 K. At the same temperature, the exchange current density increased in the order, i(111)(0) lt i(100)(0) lt i(110)(0) which gives the order of absolute kinetic activities of Pt(hkl) in 0.05 mol/L H2SO4:Pt(111) lt Pt(100) lt Pt(110). We found that at high current densities every crystal face has an ideally temperature-dependent Tafel slope, i.e., -2 x 2.3(RT/F). The activation energy for the ORR is independent of the surface geometry, Delta H-hkl(#) = 42 kJ/mol. The insensitivity of the activation energy to surface structure implies that the reaction pathway for the ORR is the same on all three single-crystal faces. A "series" pathway for the ORR was proposed, with the first electron transfer being the rate-determining step. The structure sensitivity in the kinetics of the ORR on Pt(hkl) is attributed to the structure-sensitive adsorption of bisulfate and hydroxyl anions and a simple site-blocking effect of these adsorbed anions on the rate of the ORR.", publisher = "Natl Research Council Canada, Ottawa", journal = "Canadian Journal of Chemistry-Revue Canadienne De Chimie", title = "Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions", pages = "1471-1465", number = "11", volume = "75", doi = "10.1139/v97-176" }
Grgur, B., Marković, N.,& Ross, P.. (1997). Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions. in Canadian Journal of Chemistry-Revue Canadienne De Chimie Natl Research Council Canada, Ottawa., 75(11), 1465-1471. https://doi.org/10.1139/v97-176
Grgur B, Marković N, Ross P. Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions. in Canadian Journal of Chemistry-Revue Canadienne De Chimie. 1997;75(11):1465-1471. doi:10.1139/v97-176 .
Grgur, Branimir, Marković, NM, Ross, PN, "Temperature dependent oxygen electrochemistry on platinum low index single crystal surfaces in acid solutions" in Canadian Journal of Chemistry-Revue Canadienne De Chimie, 75, no. 11 (1997):1465-1471, https://doi.org/10.1139/v97-176 . .