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Jeyabharathi Chinnaiah

Recent Publications

ACS Appl. Energy Mater. 2025

Carbon-Supported Platinum-Grafted Gold–Nickel Nanoclusters for Hydrogen Evolution ReactionA carbon-supported platinum-grafted thiolate-protected precision AuNi nanocluster (NC) (Pt-AuNi/C) is studied for the hydrogen evolution reaction (HER) in acidic solution. The AuNi/C is doped with platinum through an electroless process. The HER performance is evaluated for AuNi/C and Pt-AuNi/C in a 0.1 M sulfuric acid solution. Typical HER behavior is noticed with the noticeable reduction in overpotential by ca. 208 mVRHE @ 10 mA cm–2 after platinum incorporation in the NCs. The HER curve on pristine NCs exhibits a contrasting steady-state limiting behavior, signaling a possible radial diffusion over the NCs. This result is expected for a random array-like arrangement of NCs, and this is witnessed as a changeover in steady-state limiting behavior to mass-transport free characteristics with increased proton concentration. However, the steady-state limiting behavior is obscured by the carbon support. Further, the Pt-AuNi/C is tested in a zero-gap cell, where cathodic current density of 2.3 A cm–2 was measured at the overpotential of 0.5 VRHE, which is much better than that of the benchmark Pt/C.

Small 2024, 20, 2401998

Adsorbed Carbon Monoxide‐Enabled Self‐Terminated Au‐Grafting on Pt6 Nanoclusters for Enhanced Methanol ElectrooxidationInactive Au activates Pt6 nanoclusters! Adsorbed triphenylphosphine ligands weaken Pt-CO bond, enabling self-terminated Au grafting on Pt6 nanoclusters (NCs). In acidic solution, poor adsorption of C...

Small 2024, 20, 2308610

Platinum‐Grafted Twenty‐Five Atom Gold Nanoclusters for Robust Hydrogen EvolutionActive platinum grafting! Adsorbed hydrogen enables electroless-grafting of Pt on [Au25(PET)18]− nanoclusters with minimal platinum loading scales scaling the reactivity of hydrogen evolution reactio...

J. Phys. Chem. C 2023, 127, 19927–19936

Potential Oscillations During Cobalt–Nickel Electrodeposition in the Presence of ButynediolElectrochemical potential oscillation is observed during the electrodeposition of CoNi in the presence of butynediol (BD). Modulation of the potential oscillatory pattern occurs due to the influence of differing proton and BD concentrations through diffusion/convective diffusion on the surface processes. The potential oscillation observed is a relaxation type as a result of the interplay between (a) hydrogen adsorption by proton reduction and the scavenging of adsorbed hydrogen by BD and (b) CoNi hydroxide precipitation by water reduction and the dissolution of CoNi hydroxide by protons. Moreover, the precipitation of CoNi hydroxide occurs at a lower current density while the BD concentration is high, whereas the absence of BD necessitates a higher current density for observing the precipitation. This result suggests that BD plays a critical role in altering the interfacial pH during CoNi electrodeposition.

J. Solid State Electrochem. 2020, 24, 2997–3002

Discerning the oscillatory electrochemical response during electrodeposition of cobalt in the presence of but-2-yne-1,4-diol - Journal of Solid State ElectrochemistryWe present a new observation of electrochemical oscillation during the reduction of Co2+ from sulfate solution in the presence of but-2-yne-1,4-diol (butynediol) as an additive. Cyclic voltammetry, hydrodynamic voltammetry at galvanostatic condition, and electrochemical impedance spectroscopic studies suggest that the electrochemical oscillation observed was a relaxation type and was the manifestation of adsorbed hydrogen formation by electrochemical reduction of protons on cobalt and their chemical removal by semi-hydrogenation of butynediol to butenediol during the initial stages of electrodeposition.

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