02373nas 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

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 < x < 41) catalysts were successfully synthesized via borohydridereduction followed by hydrothermal treatment at 150 & DEG;C. The electrocatalyticperformance of the synthesized trimetallic Pt100-x (MnCo)( x ) (16 < x < 41) catalysts toward MOR was studied using cyclicvoltammetry and chronoamperometry. The results affirm that all Pt100-x (MnCo)( x ) (16 < x < 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 < x < 41) catalysts showed better CO tolerance when comparedwith comm. Pt/C. This improved performance of the Pt100-x (MnCo)( x )/C (16 < x < 41) catalyst can be attributed to the synergisticeffect of Co and Mn on the Pt lattice.

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-oxidation01819nas a2200253 4500008004100000022001400041245011500055210006900170260000900239300001200248490000700260520090800267653001701175653002101192653002201213653003201235653002601267653003001293100002101323700003501344700002401379700003101403856013101434 2024 eng d a0360-319900aElectrodeposited Co-Mn-Sn multicomponent alloy as an efficient electrocatalyst for hydrogen evolution reaction0 aElectrodeposited CoMnSn multicomponent alloy as an efficient ele cJAN  a658-6670 v493 a

Despite having exciting material characteristics, the potential of multi-component alloys (MCAs) as electrocatalysts has not been fully realized. In this work, efficient binary and ternary MCA electrocatalysts containing inexpensive metals like Co, Mn and Sn have been prepared via the electrodeposition process. When tested for hydrogen evolution reaction (HER) in an alkaline medium, ternary Co-Mn-Sn alloy displayed enhanced activity with the lowest overpotential of 136 mV, a Tafel slope of 111 mV dec 1 and a very low charge transfer resistance, making it superior to the binary alloys (Co-Mn and Co-Sn), or the single metal catalysts (Co, Mn and Sn). The ternary alloy also displayed high electro-chemical and structural stability, making it a viable electrocatalyst for the hydrogen economy.(c) 2023 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

10aClean energy10aelectrocatalysis10aElectrodeposition10ahydrogen evolution reaction10aMulti-component alloy10aNon-platinum group metals1 aChandran, Athira1 aKarumuthil, Subash, Cherumanni1 aSingh, Ashutosh, K.1 aPrasad, Bhagavatula, L. V. uhttps://library.ncl.res.in/content/electrodeposited-co-mn-sn-multicomponent-alloy-efficient-electrocatalyst-hydrogen-evolution02097nas a2200217 4500008004100000022001400041245014300055210006900198260000800267490000700275520126500282653002301547653001701570653003101587653002101618653003201639100002501671700002701696700003101723856012501754 2024 eng d a1615-684600aEstablishing a new efficiency descriptor for methanol oxidation reaction and its validation with commercially available Pt-based catalysts0 aEstablishing a new efficiency descriptor for methanol oxidation  cJUN0 v243 a

Direct methanol fuel cells (DMFCs) have received a lot of attention in recent years as promising technology for generating clean and efficient energy. In DMFC, the anode catalyst is a vital component because it is involved in the oxidation of methanol, which produces electrons that can be used as an energy source. Cyclic voltammetry (CV) is commonly used to test the characteristics of the electrode materials before they are employed in the actual fuel cell. Interestingly in the case of DMFCs CV also is a useful technique to obtain vital information about the performance and expected efficiency of the electrodes. In general, the CV of methanol electrooxidation for Pt-based catalysts has two peaks, If in the forward scan (anodic scan) and Ib in the backward scan (cathodic scan). The ratio of these two peaks (If/Ib) is the most commonly used criterion for investigating CO poisoning in catalysts. However, there is a great deal of ambiguity surrounding this criterion, owing to the genesis of Ib. Addressing this we present here a new criterion to evaluate the efficiency of the catalyst using the same CV technique. We validate this newly proposed criterion with commercial Pt/C (comm. Pt/C) and other commercially available alloy catalysts.

10acatalyst poisoning10aCO tolerance10adirect methanol fuel cells10aelectrocatalysis10aMethanol oxidation reaction1 aDeshpande, Pooja, S.1 aRadhakrishnan, Thulasi1 aPrasad, Bhagavatula, L. V. uhttps://library.ncl.res.in/content/establishing-new-efficiency-descriptor-methanol-oxidation-reaction-and-its-validation02560nas a2200277 4500008004100000022001400041245013300055210006900188260000900257300001600266490000600282520158600288653002201874653002101896653002201917653003701939653002401976653003602000653001402036653001902050100002102069700001802090700002402108700003102132856011902163 2025 eng d a2574-096200aPlatinum-free electrocatalysts based on electrodeposited Co-Mn-Ni alloys for efficient electrocatalytic alkaline water splitting0 aPlatinumfree electrocatalysts based on electrodeposited CoMnNi a cAUG  a11633-116420 v83 a

The development of a Pt-free electrocatalyst for efficient and stable water splitting is crucial for the commercialization of green hydrogen production. A low-cost electrocatalyst with good hydrogen and oxygen evolution activities (HER and OER, respectively) displaying long durability is the first step in this direction, and if the catalyst can be synthesized via an easy, convenient, and scalable procedure, that would be an added advantage. Multicomponent alloys, with their tunable compositions and abundant active sites, present a promising solution in this direction. Herein, a cost-effective CoMnNi (CMN) alloy is synthesized via electrodeposition and with optimized composition by tuning the electrolyte concentration and deposition potential to enhance electrocatalytic performance. The resulting single-phase alloy exhibits a high electrochemical surface area with an average particle size of similar to 4 nm, demonstrating excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities in 1 M KOH, with overpotentials of 121 mV at -10 mA cm-2 and 285 mV at 20 mA cm-2, respectively. Moreover, the catalyst exhibits remarkable stability, sustaining 100 h of operation at 100 mA cm-2. The CMN alloy also performs efficiently under harsh conditions, including 6 M KOH and alkaline seawater, in both symmetric and asymmetric cell configurations. This work highlights the potential of multicomponent alloys as durable, high-performance electrocatalysts for scalable water splitting, paving the way for sustainable hydrogen production.

10aalkaline seawater10aelectrocatalysis10aElectrodeposition10ahydrogen evolution reaction(HER)10amulticomponentalloy10aoxygen evolution reaction (OER)10astability10awatersplitting1 aChandran, Athira1 aDutta, Pritha1 aSingh, Ashutosh, K.1 aPrasad, Bhagavatula, L. V. uhttps://library.ncl.res.in/content/platinum-free-electrocatalysts-based-electrodeposited-co-mn-ni-alloys-efficient