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1. p-Type BiVO ₄ for Solar O ₂ Reduction to H ₂ O ₂

   https://doi.org/10.1021/jacs.4c13290  

   Seo, Daye; Somjit, Vrindaa; Wi, Dae Han; Galli, Giulia; Choi, Kyoung-Shin (January 2025, Journal of the American Chemical Society)
2. Homogeneous Catalytic Reduction of O ₂ to H ₂ O by a Terpyridine-Based FeN ₃ O Complex

   https://doi.org/10.1021/acs.inorgchem.2c00524  

   Cook, Emma N.; Hooe, Shelby L.; Dickie, Diane A.; Machan, Charles W. (May 2022, Inorganic Chemistry)

   We report a new terpyridine-based FeN3O catalyst, Fe(tpytbupho)Cl2, which reduces O2 to H2O. Variable concentration and variable temperature spectrochemical studies with decamethylferrocene as a chemical reductant in acetonitrile solution enabled the elucidation of key reaction parameters for the catalytic reduction of O2 to H2O by Fe(tpytbupho)Cl2. These mechanistic studies suggest that a 2 + 2 mechanism is operative, where hydrogen peroxide is produced as a discrete intermediate, prior to further reduction to H2O. Consistent with this proposal, the spectrochemically measured first-order rate constant k (s−1) value for H2O2 reduction is larger than that for O2 reduction. Further, significant H2O2 production is observed under hydrodynamic conditions in rotating ring-disk electrode measurements, where the product can be swept away from the cathode surface before further reduction occurs. 

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3. The non-covalently bound SO⋯H ₂ O system, including an interpretation of the differences between SO⋯H ₂ O and O ₂ ⋯H ₂ O

   https://doi.org/10.1039/C8CP05749D  

   Misiewicz, Jonathon P.; Noonan, Julia A.; Turney, Justin M.; Schaefer, Henry F. (November 2018, Physical Chemistry Chemical Physics)

   Despite the interest in sulfur monoxide (SO) among astrochemists, spectroscopists, inorganic chemists, and organic chemists, its interaction with water remains largely unexplored. We report the first high level theoretical geometries for the two minimum energy complexes formed by sulfur monoxide and water, and we report energies using basis sets as large as aug-cc-pV(Q+d)Z and correlation effects through perturbative quadruple excitations. One structure of SO⋯H 2 O is hydrogen bonded and the other chalcogen bonded. The hydrogen bonded complex has an electronic energy of −2.71 kcal mol −1 and a zero kelvin enthalpy of −1.67 kcal mol −1 , while the chalcogen bonded complex has an electronic energy of −2.64 kcal mol −1 and a zero kelvin enthalpy of −2.00 kcal mol −1 . We also report the transition state between the two structures, which lies below the SO⋯H 2 O dissociation limit, with an electronic energy of −1.26 kcal mol −1 and an enthalpy of −0.81 kcal mol −1 . These features are much sharper than for the isovalent complex of O 2 and H 2 O, which only possesses one weakly bound minimum, so we further analyze the structures with open-shell SAPT0. We find that the interactions between O 2 and H 2 O are uniformly weak, but the SO⋯H 2 O complex surface is governed by the superior polarity and polarizability of SO, as well as the diffuse electron density provided by sulfur's extra valence shell. 

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4. Co(II) Complex with a Covalently Attached Pendent Quinol Selectively Reduces O ₂ to H ₂ O

   https://doi.org/10.1021/jacs.2c08315  

   Obisesan, Segun V.; Rose, Cayla; Farnum, Byron H.; Goldsmith, Christian R. (December 2022, Journal of the American Chemical Society)
5. Tandem In ₂ O ₃ -Pt/Al ₂ O ₃ catalyst for coupling of propane dehydrogenation to selective H ₂ combustion

   https://doi.org/10.1126/science.abd4441  

   Yan, Huan; He, Kun; Samek, Izabela A.; Jing, Dian; Nanda, Macy G.; Stair, Peter C.; Notestein, Justin M. (March 2021, Science)

   Tandem catalysis couples multiple reactions and promises to improve chemical processing, but precise spatiotemporal control over reactive intermediates remains elusive. We used atomic layer deposition to grow In₂O₃over Pt/Al₂O₃, and this nanostructure kinetically couples the domains through surface hydrogen atom transfer, resulting in propane dehydrogenation (PDH) to propylene by platinum, then selective hydrogen combustion by In₂O₃, without excessive hydrocarbon combustion. Other nanostructures, including platinum on In₂O₃or platinum mixed with In₂O₃, favor propane combustion because they cannot organize the reactions sequentially. The net effect is rapid and stable oxidative dehydrogenation of propane at high per-pass yields exceeding the PDH equilibrium. Tandem catalysis using this nanoscale overcoating geometry is validated as an opportunity for highly selective catalytic performance in a grand challenge reaction. 

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