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Impact of chromium coordination on the single-electron potentials for the reduction of oxygen to water

Journal Article · · Journal of the American Chemical Society; (United States)
DOI:https://doi.org/10.1021/ja00087a031· OSTI ID:7069641
; ;  [1]
  1. Iowa State Univ., Ames, IA (United States)
Chemical equilibration of CrOO[sup 2+] has allowed evaluation of the potential for the half-reaction CrOO[sup 2+] + H[sup +] + e[sup [minus]] [yields] CrOOH[sup 2+] as +0.82 V vs NHE. Kinetic data for the reaction of CrO[sup 2+] and H[sub 2]O[sub 2] allow refinement of the potential for the CrO[sup 2+] + 2H[sup +] + e[sup [minus]] [yields] Cr[sup 3+] + H[sub 2]O reaction to lie within the range 1.71 V [le] E[sup o] [le] 1.85 V. With these values the potentials for each step of reduction of water to oxygen, as mediated by chromium complexation, are obtained. The chemical implications of these findings for the reactions and reactivity of the three chromium-containing species CrOO[sup 2+], CrOOH[sup 2+], and CrO[sup 2+] are presented. 30 refs., 1 figs., 1 tab.
OSTI ID:
7069641
Journal Information:
Journal of the American Chemical Society; (United States), Journal Name: Journal of the American Chemical Society; (United States) Vol. 116:8; ISSN JACSAT; ISSN 0002-7863
Country of Publication:
United States
Language:
English