@article {47674,
	title = {Seed-mediated growth of Pt on high-index faceted Au nanocrystals: the ag lining and implications for electrocatalysis},
	journal = {ACS Applied Nano Materials},
	volume = {4},
	year = {2021},
	month = {SEP },
	pages = {9155-9166},
	type = {Article},
	abstract = {Bimetallic Au@Pt nanocrystals (NCs) offer a unique combination of plasmonic and catalytic properties and are a growing field of research. Herein, we report an unusual observation in the behavior of silver ions (Ag+) which was found to play a dominant role in dictating the Pt deposition in a seed-mediated growth method. {\textquoteleft}While the literature is replete with various instances of Ag-assisted Pt deposition whereby higher concentration of Ag+ translates into a thicker Pt shell, in the present study, contradictory observations were made. In the presence of lower amounts of Ag+, thick Pt shells were visualized, while at higher concentrations of Ag+, the extent of Pt deposition via the galvanic replacement reaction was reduced. Additionally, the presence of Ag was deemed necessary for the Pt deposition to take place, either in the form of an underpotential deposition layer on the Au NCs or by introducing Ag+ in the growth solution. We have demonstrated our findings on two different Au NCs enclosed with high-index facets, concave cuboid, and elongated tetrahexahedra, which mirror similar observations and provide generality to our claim. To the best of our knowledge, the time required for Pt deposition on the Au core in the present work is the least among the reported seed-mediated routes. Furthermore, this work, besides presenting a facile and general route for the amalgamation of catalytic and plasmonic properties in hybrid Pt-Au NCs, sheds light on the mechanistic aspects of Ag-assisted wet-chemical generation of bimetallic Au@Pt NCs. The overall electrocatalytic performance of our Au@Pt NCs toward the oxygen reduction reaction was realized to be impressive.},
	keywords = {bimetallic nanostructure, galvanic replacement reaction, high-index facet, oxygen reduction reaction, seed-mediated growth, underpotential deposition},
	doi = {10.1021/acsanm.1c01714},
	author = {Roy, Debashree and Rajendra, Ranguwar and Gangadharan, Pranav K. and Pandikassala, Ajmal and Kurungot, Sreekumar and Ballav, Nirmalya}
}
@article {47055,
	title = {Toward pH independent oxygen reduction reaction by polydopamine derived 3D interconnected, iron carbide embedded graphitic carbon},
	journal = {ACS Applied Materials \& Interfaces},
	volume = {13},
	year = {2021},
	month = {FEB },
	pages = {8147-8158},
	type = {Article},
	abstract = {<p>Recent advancements on the development of nonprecious electrocatalysts with iron (Fe) incorporated active centers have generated confidence on realizing cost-effective proton exchange membrane fuel cells (PEMFCs). However, most of these catalysts that emerged as a substitution for the platinum supported on carbon (Pt/C) catalysts in oxygen reduction reaction (ORR) are active under basic conditions, and their feasibility in PEMFCs remains as a challenge. In this scenario, this work reports the synthesis of a Pt-free oxygen reduction electrocatalyst prepared by the annealing of polydopamine grown melamine foam. The prepared catalyst has a three-dimensional (3D) interconnected bilayer network structure possessing the carbon nitride backbone wrapped by graphitic carbon layer bearing iron carbides and nitrides as the active centers (3DFePDC). Interestingly, the 3D-FePDC catalyst displayed an ORR activity both under acidic and basic conditions. Whereas the ORR performance of 3D-FePDC closely matches that of the commercial Pt/C in the basic medium, it displays only a low overpotential value of 60 mV under acidic conditions compared to its Pt counterpart. The kinetics of ORR on 3DFePDC is found to be similar to the four-electron (4e) reduction pathway displayed by Pt/C. Testing of a PEMFC in a single cell mode by using 3D-FePDC as the cathode catalyst and Nafion membrane delivered a maximum power density of 278 mW cm(-2), which is a promising value expected from a system based on the nonprecious metal cathode. Ultimately, as a cost-effective catalyst that can effectively perform irrespective of the pH conditions, 3D-FePDC offers significant prospects in the areas like fuel cells and metal-air batteries which work in acidic and/or basic conditions.</p>
},
	keywords = {acidic medium, electrocatalyst, fuel cell, graphitic carbon, Iron carbide, nitrogen doping, nonprecious metal, oxygen reduction reaction},
	issn = {1944-8244},
	doi = {10.1021/acsami.0c18036},
	author = {Gangadharan, Pranav K. and Pandikassala, Ajmal and Kurungot, Sreekumar}
}
@article {47826,
	title = {Tuning of oxygen reduction pathways through structural variation in transition metal-doped Ba2In2O5},
	journal = {ChemElectroChem},
	volume = {9},
	year = {2022},
	month = {JAN},
	pages = {e202101163},
	type = {Article},
	abstract = {Abstract Oxygen reduction reaction (ORR) can take place either through a two-electron pathway to form H2O2 or through a four-electron pathway to form H2O. Both the reactions are important in the respective fields, viz., H2O2 production as well as fuel cell technology, and rational design of catalysts is mandatory to acquire high energy efficiency in both cases. Here, we report the structure-electrochemical property correlation of a series of perovskite related brownmillerite compounds, Ba2In0.75M0.25O5 (M=Mn/Fe/Co/Ni/Cu), synthesized by solid-state method. On transition metal doping, octahedral distortions were observed, and the highly disordered material tends to follow the 4e transfer mechanism. More symmetrical structures followed the 2e pathway to form H2O2 as the product with high peroxide selectivity. The distortion in the octahedral arrangement can be a descriptor to finetune the selectivity of the catalysts towards the 2e and 4e pathways of ORR.},
	keywords = {brownmillerite, Descriptors, Electrochemical H2O2 synthesis, Octahedral distortion, oxygen reduction reaction},
	doi = {10.1002/celc.202101163},
	author = {Thundiyil, Shibin and Pandikassala, Ajmal and Kurungot, Sreekumar and Devi, R. Nandini}
}
@article {48324,
	title = {Pt-anchored-zirconium phosphate nanoplates as high-durable carbon-free oxygen reduction reaction electrocatalyst for PEM fuel cell applications},
	journal = {Advanced Sustainable Systems},
	volume = {7},
	year = {2023},
	month = {FEB},
	type = {Article},
	abstract = {<p>
	Commercially available platinum-supported carbon (Pt/C) catalysts are the most widely used oxygen reduction reaction (ORR) electrocatalysts in polymer electrolyte membrane fuel cells (PEMFCs). However, inadequate active triple-phase boundary formation and carbon oxidation in Pt/C during PEMFC operation shorten its lifetime and efficiency. In this direction, a new class of carbon-free electrocatalysts for ORR is prepared by dispersing Pt nanoparticles on ZrP (Zirconium phosphates) nanoplates. In one case (ZrP@Pt), the Pt nanoparticles are found to be closely distributed and completely covering the ZrP nanoplates, whereas in the second case (Pt/ZrP), the Pt nanoparticles selectively restrict dispersion along the edges of the support. ZrP as the support displays an intrinsic proton conductivity of approximate to 0.5 x 10(-4) S cm(-1) at 70 degrees C, with an activation energy (E-a) of 0.19 eV. Pt/ZrP shows better durability after 3000 start-stop cycles. The mass activity of Pt/ZrP is increased by 4.6 times compared to Pt/C, which exhibits a loss in mass activity by 1.37 times. The single-cell level validation of ZrP@Pt, Pt/ZrP, and Pt/C as the electrocatalysts in PEMFC at an operating potential of 0.60 V shows the achievable current densities of 0.600, 0.890, and 0.890 A cm(-2).</p>
},
	keywords = {carbon-free electrocatalysts, fuel cells, oxygen reduction reaction, zirconium phosphate},
	issn = {2366-7486},
	doi = {10.1002/adsu.202200330},
	author = {Kumar, Sachin and Yoyakki, Athira and Pandikassala, Ajmal and Soni, Roby and Kurungot, Sreekumar}
}
