Polypyrrole-multi walled carbon nanotube hybrid material supported Pt NPs for hydrogen evolution from the hydrolysis of MeAB at mild conditions
Authors: Esra Kuyuldar
Yasar Karatas
Mehmet Gulcan
Hilal Acidereli
Fatih Sen
Journal: Scientific Reports (2019)
Discipline: Multidisciplinary
Keywords: polypyrrole; multi walled carbon nanotube; Pt nanoparticles; methylamine borane; hydrolysis reaction
Affiliations: Chemistry Department, Faculty of Science, Van Yüzüncü Yıl University, Zeve Campus, 65080, Van, Turkey., Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Çelebi Campus, 43100, Kütahya, Turkey., Chemistry Department, Faculty of Science, Van Yüzüncü Yıl University, Zeve Campus, 65080, Van, Turkey. ., Sen Research Group, Biochemistry Department, Faculty of Arts and Science, Dumlupınar University, Evliya Çelebi Campus, 43100, Kütahya, Turkey. .

Abstract:  Herein, we report a facile method for the preparation of polypyrrole-multi walled carbon nanotube hybrid material including Pt nanoparticles (Pt@PPy-MWCNT NPs) and the use in methylamine borane (MeAB) for hydrolysis reaction at mild conditions. The prepared catalyst of Pt@PPy-MWCNT NPs was characterized by some advanced analytical methods. The catalytic experiments showed the Pt@PPy-MWCNT NPs can catalyze MeAB in aquatic solution with high catalytical performance at mild conditions. The reaction rate of catalytic hydrolysis with Pt@PPy-MWCNT NPs was found to be -d[CH3NH2BH3]/dt = + d[H2]/3dt = kobs[Pt@PPy-MWCNT]1.19 [MeAB]0.88. The TOF value for the hydrolysis of MeAB catalyzed with Pt@PPy-MWCNT NPs was detected to be 10234.2 1/h (170.57 1/min) which is very high compared with TOF values found for other catalysts. Enthalpy, entropy and activation energy for the hydrolysis of MeAB were calculated to be 31.57 kJ mol-1, -119.97 J mol-1 K and 34.27 kJ mol-1, respectively. 

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PubPeer comments:
 Figure 2. XRD analyses of (a) Pt@Ppy, (b) Pt@MWCNT and (c) Pt@PPy-MWCNT NPs. These are 3 copies of one XRD pattern ![file] , 
 #1 This phenomenon is very easy to understand. If they used the same glass slide when preparing XRD test samples, and at the same time they had fewer samples, this phenomenon would appear. The background peak has no value. The main XRD peaks of the three samples are completely different, and this result is acceptable. , 
 This paper is one of 40+ (41 and counting) papers by the same research group that all share the same photo. In all 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 is used to represent a different type of nanoparticle in each of these papers. Here is a collage of 6 different uses of the same photo,  Inset 1 : ![file] A list of the first 30 papers that all use this photo, and the different types of nanoparticles that they represent can e.g. be found here: * Betuu0308l Su0327en et al. - DOI: 10.1016 j.ijhydene.2018.03.175 - https: pubpeer.com publications 8AD71F4A32472314CCE9983D47E36F Of note, this is a different set of papers than the 15 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 the first 14 papers identified in that set, see DOI: 10.1016 j.ijhydene.2017.05.113 https: pubpeer.com publications CAD2F16435F6C639F5DE6851A2E61D Here is Figure 1 of this paper, which includes the  Inset 1 photo: ![file] , 
 #2  This phenomenon is very easy to understand. If they used the same glass slide when preparing XRD test samples, and at the same time they had fewer samples, this phenomenon would appear You seem to be arguing that the test samples produce no background x-ray scattering between the main peaks, so all the background noise is produced by a glass slide, and is completely reproducible. Is that a fair summary? ,