01902nas a2200193   4500008004100000022001400041245015300055210006900208260000900277300001400286490000800300520117000308100002401478700002001502700002101522700001801543700003001561856011701591       2021                        eng d  a1932-744700aDisordered but efficient: understanding the role of structure and composition of the Co-Pt alloy on the electrocatalytic methanol oxidation reaction0 aDisordered but efficient understanding the role of structure and  cAPR   a7611-76240 v1253 a<p>A systematic investigation of the electrocatalytic Methanol Oxidation Reaction (MOR) was carried out using a model Co:Pt alloy system with different compositions and structural arrangements of the Co and Pt atoms. The structural variations with the same alloy composition included those with disordered arrangement of Co and Pt atoms in a face-centered cubic (fcc) lattice and ordered arrangements in face-centered tetragonal (fct) lattices. Our investigations clearly show that structures with disordered arrangements with Co:Pt atomic ratios near to 1:1 display better electrocatalytic efficiencies even when compared to pure Pt. These experimental findings were then rationalized by means of Density Functional Theory (DFT) calculations. Electronic level signatures in terms of charge transfer and relative shift in the peaks of the d band for surface metal atoms are proposed to be the reasons for the superior catalytic activity of a particular composition over the others. An increase in the number of inequivalent sites for methanol adsorption in disordered systems appears to result in better catalytic performance in comparison with ordered systems.</p>1 aDalavi, Shankar, B.1 aAgarwal, Sheena1 aDeshpande, Pooja1 aJoshi, Kavita1 aPrasad, Bhagavatula L. V.  uhttps://library.ncl.res.in/content/disordered-efficient-understanding-role-structure-and-composition-co-pt-alloy02373nas a2200217   4500008004100000022001400041245011800055210006900173260000800242300001600250490000700266520156800273653001701841653003101858653002101889653003701910653003201947100002101979700003102000856012402031       2023                        eng d  a1944-824400aAlloying with Mn enhances the activity and durability of the CoPt catalyst toward the methanol oxidation reaction0 aAlloying with Mn enhances the activity and durability of the CoP  cMAY  a26554-265620 v153 a<p>
	To improve the catalytic performance and durability ofPt catalystsused for the methanol oxidation reaction (MOR) in direct methanolfuel cells (DMFCs), alloying of Pt with other transition metals suchas Ru, Co, Ni, and Fe is considered an effective approach. Despitethe significant progress made in the preparation of bimetallic alloysand their utilization for MOR, improving the activity and durabilityof the catalysts to make them commercially viable remains a stiffchallenge. In this work, trimetallic Pt100-x (MnCo)( x ) (16 &lt; x &lt; 41) catalysts were successfully synthesized via borohydridereduction followed by hydrothermal treatment at 150 &amp; DEG;C. The electrocatalyticperformance of the synthesized trimetallic Pt100-x (MnCo)( x ) (16 &lt; x &lt; 41) catalysts toward MOR was studied using cyclicvoltammetry and chronoamperometry. The results affirm that all Pt100-x (MnCo)( x ) (16 &lt; x &lt; 41) alloys have superior MOR activityand durability as compared to bimetallic PtCo alloys and commerciallyavailable Pt/C (comm. Pt/C) catalysts. Among all the compositionsstudied, the Pt60Mn1.7Co38.3/C catalystexhibited superior mass activity (1.3 and 1.9 times higher than thoseof Pt81Co19/C and comm. Pt/C, respectively)toward MOR. Furthermore, all the newly synthesized Pt100-x (MnCo)( x )/C (16 &lt; x &lt; 41) catalysts showed better CO tolerance when comparedwith comm. Pt/C. This improved performance of the Pt100-x (MnCo)( x )/C (16 &lt; x &lt; 41) catalyst can be attributed to the synergisticeffect of Co and Mn on the Pt lattice.</p>
10aCO tolerance10adirect methanol fuel cells10aelectrocatalysis10amethanol oxidation reaction(MOR)10atrimetallic alloy catalysts1 aDeshpande, Pooja1 aPrasad, Bhagavatula, L. V.  uhttps://library.ncl.res.in/content/alloying-mn-enhances-activity-and-durability-copt-catalyst-toward-methanol-oxidation