Monodisperse palladium–cobalt alloy nanocatalyst supported on activated carbon (AC) as highly effective catalyst for the DMAB dehydrocoupling
Authors: Neslihan Karaman
Betul Sen
Hilal Acidereli
Fatih Sen
Journal: Scientific Reports (2020)
Discipline: Multidisciplinary
Keywords: activated carbon; palladium/cobalt nanocatalyst; hydrogen release; dimethylamine boron; nanomaterials
Affiliations: Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Celebi Campus, 43100, Kutahya, Turkey., Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Celebi Campus, 43100, Kutahya, Turkey. .

Abstract:  In the study, activated carbon (AC) supported palladium/cobalt (Pd/Co) nanocatalyst was synthesized to achieve hydrogen release from dimethylamine boron (DMAB). Nanocatalyst were produced by the reduction of Pd2+ and Co2+ cations by the ultrasonic double reduction method. Analytical studies of the synthesized nanomaterials were characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), electron energy loss spectroscopy, ultraviolet-visible spectroscopy. In this research, nanomaterials exhibited high catalytic activity and reusability, and great performance at low temperatures and concentrations. For the dehydrogenation reaction of dimethylamine borane, TOF and Ea were calculated as 379.5 h-1 and 75.86 kJ mol-1, respectively. The PdCo@AC nanocatalyst can be used as a promising catalyst for the hydrogen production reaction from DMAB. 

Retracted: No

PubPeer comments:
 This paper appears to be one of a set of at least 2 papers by the same research group that both appear to share the same photo. In both papers, this photo is used as a zoomed-in inset representing the high-resolution transmission electron microscopy (HRTEM) analysis of the  atomic lattice fringe and particle size of the nanoparticles. Of concern, the same photo, which I have called  Inset 4 , is used to represent a different type of nanoparticle in each of these papers. The two papers using the  Inset 4 photo are: * Betuu0308l Su0327en et al. - DOI: 10.1038 s41598-020-68773-x - PdCo@AC * Haydar Gou0308ksu et al. - DOI: 10.1038 s41598-020-66492-x - PtNi@SWCNT Here is a comparison of both  Inset 4 photos: ![file] ![file] Here is a close-up view of both inset photos with red boxes marking the similar-looking areas. ![file] Of note, this is a different set of papers than the 30 papers by the same group that all appear to use another HRTEM image called  Inset 1 . For an example of that photo and the list of those 30 papers, see DOI 10.1016 j.ijhydene.2018.03.175 https: pubpeer.com publications 8AD71F4A32472314CCE9983D47E36F It is also a different set of papers than the 14 papers by the same group that all appear to use another HRTEM image called  Inset 2 . For an example of that photo and the list of those 14 papers, see DOI: 10.1016 j.ijhydene.2017.05.113 https: pubpeer.com publications CAD2F16435F6C639F5DE6851A2E61D , 
 Three appearances of the the same mother XRD pattern in three papers about three different materials. https: pubpeer.com publications B41CD7CE64F39C92F2BBF540DD0FFF#2 doi: 10.1016 j.ijhydene.2017.05.115 https: pubpeer.com publications 7A123B2F1443D6AC355E4B633E05E2#5 doi: 10.1016 j.nanoso.2017.08.013 Pd@AC and Pd@PEDOT are similar for whole angle range Pd@GO is different for lower angle part. Lower angle part is where peak from GO to be found. ![file] ,