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1. Heterogeneous Electrocatalysts for Metal–CO ₂ Batteries and CO ₂ Electrolysis

   https://doi.org/10.1021/acsenergylett.2c02445  

   Wang, Jianda; Marchetti, Barbara; Zhou, Xiao-Dong; Wei, Shuya (April 2023, ACS Energy Letters)
2. Electron beam-induced deposition of platinum from Pt(CO) ₂ Cl ₂ and Pt(CO) ₂ Br ₂

   https://doi.org/10.3762/bjnano.11.161  

   Mahgoub, Aya; Lu, Hang; Thorman, Rachel M; Preradovic, Konstantin; Jurca, Titel; McElwee-White, Lisa; Fairbrother, Howard; Hagen, Cornelis W (January 2020, Beilstein Journal of Nanotechnology)

   null (Ed.)

   Two platinum precursors, Pt(CO) 2 Cl 2 and Pt(CO) 2 Br 2 , were designed for focused electron beam-induced deposition (FEBID) with the aim of producing platinum deposits of higher purity than those deposited from commercially available precursors. In this work, we present the first deposition experiments in a scanning electron microscope (SEM), wherein series of pillars were successfully grown from both precursors. The growth of the pillars was studied as a function of the electron dose and compared to deposits grown from the commercially available precursor MeCpPtMe 3 . The composition of the deposits was determined using energy-dispersive X-ray spectroscopy (EDX) and compared to the composition of deposits from MeCpPtMe 3 , as well as deposits made in an ultrahigh-vacuum (UHV) environment. A slight increase in metal content and a higher growth rate are achieved in the SEM for deposits from Pt(CO) 2 Cl 2 compared to MeCpPtMe 3 . However, deposits made from Pt(CO) 2 Br 2 show slightly less metal content and a lower growth rate compared to MeCpPtMe 3 . With both Pt(CO) 2 Cl 2 and Pt(CO) 2 Br 2 , a marked difference in composition was found between deposits made in the SEM and deposits made in UHV. In addition to Pt, the UHV deposits contained halogen species and little or no carbon, while the SEM deposits contained only small amounts of halogen species but high carbon content. Results from this study highlight the effect that deposition conditions can have on the composition of deposits created by FEBID. 

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3. The Prototypical Transition Metal Carbenes, (CO) ₅ Cr=CH ₂ , (CO) ₄ Fe=CH ₂ , (CO) ₃ Ni=CH ₂ , (CO) ₅ Mo=CH ₂ , (CO) ₄ Ru=CH ₂ , (CO) ₃ Pd=CH ₂ , (CO) ₅ W=CH ₂ , (CO) ₄ Os=CH ₂ , and (CO) ₃ Pt=CH ₂ : Challenge to Experiment

   https://doi.org/10.1021/acs.jpca.8b05394  

   Weidman, Jared D.; Estep, Marissa L.; Schaefer, Henry F. (July 2018, The Journal of Physical Chemistry A)
4. Ion-induced surface reactions and deposition from Pt(CO) ₂ Cl ₂ and Pt(CO) ₂ Br ₂

   https://doi.org/10.3762/bjnano.15.115  

   Abdel-Rahman, Mohammed K; Eckhert, Patrick M; Chaudhary, Atul; Johnson, Johnathon M; Yu, Jo-Chi; McElwee-White, Lisa; Fairbrother, D Howard (January 2024, Beilstein Journal of Nanotechnology)

   Ion beam-induced deposition (IBID) using Pt(CO)₂Cl₂and Pt(CO)₂Br₂as precursors has been studied with ultrahigh-vacuum (UHV) surface science techniques to provide insights into the elementary reaction steps involved in deposition, complemented by analysis of deposits formed under steady-state conditions. X-ray photoelectron spectroscopy (XPS) and mass spectrometry data from monolayer thick films of Pt(CO)₂Cl₂and Pt(CO)₂Br₂exposed to 3 keV Ar⁺, He⁺, and H₂⁺ions indicate that deposition is initiated by the desorption of both CO ligands, a process ascribed to momentum transfer from the incident ion to adsorbed precursor molecules. This precursor decomposition step is accompanied by a decrease in the oxidation state of the Pt(II) atoms and, in IBID, represents the elementary reaction step that converts the molecular precursor into an involatile PtX₂species. Upon further ion irradiation these PtCl₂or PtBr₂species experience ion-induced sputtering. The difference between halogen and Pt sputter rates leads to a critical ion dose at which only Pt remains in the film. A comparison of the different ion/precursor combinations studied revealed that this sequence of elementary reaction steps is invariant, although the rates of CO desorption and subsequent physical sputtering were greatest for the heaviest (Ar⁺) ions. The ability of IBID to produce pure Pt films was confirmed by AES and XPS analysis of thin film deposits created by Ar⁺/Pt(CO)₂Cl₂, demonstrating the ability of data acquired from fundamental UHV surface science studies to provide insights that can be used to better understand the interactions between ions and precursors during IBID from inorganic precursors. 

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5. Plastic from CO ₂ , Water, and Electricity: Tandem Electrochemical CO ₂ Reduction and Thermochemical Ethylene‐CO Copolymerization

   https://doi.org/10.1002/anie.202503003  

   Zhelyabovskiy, Maxim; Jung, Hyuk‐Joon; Diaconescu, Paula L; Peters, Jonas C; Agapie, Theodor (June 2025, Angewandte Chemie International Edition)

   Abstract Converting CO₂into industrially useful products is an appealing strategy for utilization of an abundant chemical resource. Electrochemical CO₂reduction (eCO₂R) offers a pathway to convert CO₂into CO and ethylene, using renewable electricity. These products can be efficiently copolymerized by organometallic catalysts to generate polyketones. However, the conditions for these reactions are very different, presenting the challenge of coupling microenvironments typically encountered for the transformation of CO₂into highly complex but desirable multicarbon products. Herein, we present a system to produce polyketone plastics entirely derived from CO₂and water, where both the CO and C₂H₄intermediates are produced by eCO₂R. In this system, a combination of Cu and Ag gas diffusion electrodes is used to generate a gas mixture with nearly equal concentrations of CO and C₂H₄, and a recirculatory CO₂reduction loop is used to reach concentrations of above 11% each, leading to a current‐to‐polymer efficiency of up to 51% and CO₂utilization of 14%. 

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