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1. Passivation of Cu-Rh Alloys

   https://doi.org/10.1149/1945-7111/ac0f60  

   Xie, Yusi ; Chatterjee, Swarnendu ; Liu, Ling-Zhi ; Jin, Hai-Jun ; Sieradzki, Karl ( July 2021 , Journal of The Electrochemical Society)

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2. Resistivity Size Effect in Epitaxial Rh(001) and Rh(111) Layers

   https://doi.org/10.1109/TED.2020.3040202  

   Jog, Atharv ; Zhou, Tianji ; Gall, Daniel ( January 2021 , IEEE Transactions on Electron Devices)

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3. Temperature-resolved surface infrared spectroscopy of CO on Rh(111) and (2 × 1)-O/Rh(111)

   https://doi.org/10.1116/6.0001932  

   Jamka, Elizabeth A. ; Gillum, Maxwell Z. ; Grytsyshyn-Giger, Christina N. ; Lewis, Faith J. ; Killelea, Daniel R. ( July 2022 , Journal of Vacuum Science & Technology A)

   Heterogeneously catalyzed reactions over transition metal surfaces are pillars of chemical industry and account for a significant fraction of the global energy demand. CO oxidation provides insight into the relative reactivity of various oxygenaceous surface phases, and it is necessary to first understand where it binds to the surface and the nature of the local environment to develop robust mechanistic pictures of the reaction. Surface IR spectroscopy is a quantitative technique that also provides information about the binding sites and chemical environments of the adsorbed CO molecules. Here, we report results from a study of CO sticking to clean Rh(111) and (2 × 1)-O/Rh(111) that shows that the intensity of the IR absorption was not linear with coverage and is an important consideration for further studies of the catalytic surface. 

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4. Oxidative Alkenylation of Arenes Using Supported Rh Materials: Evidence that Active Catalysts are Formed by Rh Leaching

   https://doi.org/10.1002/cctc.202001526  

   Luo, Zhongwen ; Whitcomb, Colby A. ; Kaylor, Nicholas ; Zhang, Yulu ; Zhang, Sen ; Davis, Robert J. ; Gunnoe, T. Brent ( November 2020 , ChemCatChem)

   This work focuses on the synthesis of supported Rh materials and study of their efficacy as pre‐catalysts for the oxidative alkenylation of arenes. Rhodium particles supported on silica (Rh/SiO₂; ∼3.6 wt% Rh) and on nitrogen‐doped carbon (Rh/NC; ∼1.0 wt% Rh) are synthesized and tested. Heating mixtures of Rh/SiO₂or Rh/NC with benzene and ethylene or α‐olefins and CuX₂{X=OPiv (trimethylacetate) or OHex (2‐ethyl hexanoate)} to 150 °C results in the production of alkenyl arenes. When using Rh/SiO₂or Rh/NC as catalyst precursor, the conversion of benzene and propylene or toluene and 1‐pentene yields a ratio of anti‐Markovnikov to Markovnikov products that is nearly identical to the same ratios as the molecular catalyst precursor [Rh(μ‐OAc)(η²‐C₂H₄)₂]₂. These results and other observations are consistent with the formation of active catalysts by leaching of soluble Rh from the supported Rh materials.

    

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5. Emergence of Subsurface Oxygen on Rh(111)

   https://doi.org/10.1021/acs.jpclett.1c01820  

   Turano, Marie E. ; Jamka, Elizabeth A. ; Gillum, Maxwell Z. ; Gibson, K. D. ; Farber, Rachael G. ; Walkosz, Weronika ; Sibener, S. J. ; Rosenberg, Richard A. ; Killelea, Daniel R. ( June 2021 , The Journal of Physical Chemistry Letters)

   null (Ed.)