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    Bimetallic platinum-rhodium nanocomposites for dimethylamine borane dehydrogenation: an experimental and density functional theory study
    (Royal Soc Chemistry, 2020) Alptekin, Oznur; Sen, Betul; Acidereli, Hilal; Ercetin, Umran; Fellah, Mehmet Ferdi; Sen, Fatih
    In this study, bimetallic platinum-rhodium nanocomposites supported on graphene oxide (PtRh@GO) were synthesized and used as a catalyst in the dimethylamine borane (DMAB) dehydrogenation. The synthesized PtRh@GO catalyst was characterized using spectral and microscopic methods. The characterization studies revealed that the obtained PtRh@GO nanomaterials were nano-sized and exhibited a monodisperse distribution on GO. As a result of the catalytic studies, it was determined that the dehydrogenation reaction of dimethylamine borane depends on the temperature, amount of catalyst, and substrate. Additionally, some kinetic data and activation parameters were investigated for the dimethylamine dehydrogenation of DMAB with the help of PtRh@GO. The kinetic and activation parameters showed that the PtRh@GO catalyst could be used effectively. The activation energy (E-a) was found to be 17 +/- 2 kJ mol(-1)for the dimethylamine borane dehydrogenation. Using previously performed studies, comparison studies for the turnover frequency (TOF) value of the PtRh@GO catalyst in the dimethylamine borane reaction showed that the obtained PtRh@GO catalyst could be used effectively with a higher TOF (274.6 h(-1)) value. In addition, DFT computations were utilized on the structure of PtRh@GO in order to investigate the activity of the catalyst. The experimental data have been supported by the theoretical results based on DFT.
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    Retraction: Bimetallic platinum-rhodium nanocomposites for dimethylamine borane dehydrogenation: An experimental and density functional theory study (Catal. Sci. Technol. (2020) 10 (4624-4634) DOI: 10.1039/D0CY00641F)
    (Royal Society of Chemistry, 2021) Acidereli, Hilal; Fellah, Mehmet Ferdi
    Hilal Acidereli and Mehmet Ferdi Fellah hereby wholly retract this Catalysis Science & Technology article due to concerns with the reliability of the data in the published article. The high-resolution transmission electron micrograph inset in Fig. 1a, which represents PtRh@GO nanocomposites, is a duplicated, rotated and scaled version of high resolution transmission lectron micrograph insets in 41 other papers by the same author group all representing different nanoparticles or synthetic methods. The authors claim that this was a mistake and provided replacement data for consideration. However, an expert reviewed the authors’ response and concluded that it did not satisfactorily address the concerns, and that the replacement figure did not fully support the conclusions. The portions of the two XRD spectra in Fig. 2a between 30 and 55°, representing two different materials: Pt@GO and PtRh@GO, are the same. The authors provided replacement data for consideration. However, an expert reviewed the authors’ response and concluded that it did not satisfactorily address the concerns, and that the replacement figure did not fully support the conclusions. Given the significance of the concerns about the validity of the data, the findings presented in this paper are no longer reliable. Fatih Sen opposes this retraction. Oznur Alptekin, Betul Sen and Umran Ercetin were contacted but did not respond. Signed: Maria Southall, Executive Editor, Catalysis Science & Technology.