@article {49360,
	title = {Breaking the Pt electron symmetry and OH spillover towards ptir active center for performance modulation in direct ammonia fuel cell},
	journal = {Small},
	volume = {20},
	year = {2024},
	month = {DEC},
	type = {Article},
	abstract = {<p>
	The growing interest in low-temperature direct ammonia fuel cells (DAFCs) arises from the utilization of a carbon-neutral ammonia source; however, DAFCs encounter significant electrode overpotentials due to the substantial energy barrier of the *NH2 to *NH dehydrogenation, compounded by the facile deactivation by *N on the Pt surface. In this work, a unique catalyst, Pt4Ir@AlOOH/NGr i.e., Pt4Ir/ANGr, is introduced composed of PtIr alloy nanoparticles controllably decorated on the pseudo-boehmite phase of AlOOH-supported nitrogen-doped reduced graphene (AlOOH/NGr) composite, synthesized via the polyol reduction method. The detailed studies on the structural and electronic properties of the catalyst by XAS and VB-XPS reveal the possible electronic modulations. The optimized Pt4Ir/ANGr composition exhibits a significantly improved onset potential and mass activity for AOR. The DFT study confirms the OHad species spillover by AlOOH and Pt4Ir (100) facilitates the conversion of the *NH2 to *NH with minimal energy barriers. Finally, testing of DAFC at the system level using a membrane electrode assembly (MEA) with Pt4Ir/ANGr as the anode catalyst, demonstrating the suitability of the catalyst for its practical applications. This study thus uncovers the potential of the Pt4Ir catalyst in synergy with ANGr, largely addressing the challenges in hydrogen transportation, storage, and safety within DAFCs. In this article, a versatile catalyst, Pt4Ir/ANGr, is introduced composed of PtIr alloy nanoparticles decorated on AlOOH/NGr composite. The AlOOH provides an -OH-rich surface conducive to the facile adsorption and decoration of the PtIr alloy nanoparticles and OHad species spillover from AlOOH to the Pt4Ir active center during AOR, further validating the higher experimental activity obtained in Pt4Ir/ANGr. image</p>
},
	keywords = {ammonia oxidation reaction (AOR), d-band center, density functional theory (DFT) study, direct ammonia fuel cells, hydroxyl spillover effect, XAS analysis},
	issn = {1613-6810},
	doi = {10.1002/smll.202406589},
	author = {Barik, Sidharth and Kharabe, Geeta Pandurang and Samal, Pragnya Paramita and Urkude, Rajashri R. and Kumar, Sachin and Yoyakki, Athira and Vinod, C. P. and Krishnamurty, Sailaja and Kurungot, Sreekumar}
}
@article {49236,
	title = {Nanotrap infused ultrathin hybrid composite material for rapid and highly selective entrapment of 99TcO4-},
	journal = {CHEMICAL SCIENCE},
	volume = {15},
	year = {2024},
	month = {NOV},
	pages = {18463-18475},
	type = {Journal Article},
	keywords = {Adsorption, CAPTURE, EFFICIENT, Metal-organic framework, Removal, TECHNETIUM},
	issn = {2041-6520},
	doi = {10.1039/d4sc04010d},
	author = {Mandal, Writakshi and Fajal, Sahel and Majumder, Dipanjan and Sengupta, Arijit and Let, Sumanta and Urkude, Rajashri R. and Shirolkar, Mandar M. and Torris, Arun and Ghosh, Sujit K.}
}
@article {49080,
	title = {Role of nitrogen doping in modulating ruthenium nanocatalysts for enhanced electrochemical hydrogen evolution reaction in alkaline medium},
	journal = {Chemistry of Materials },
	volume = {36},
	year = {2024},
	month = {APR },
	pages = {4262-4274},
	type = {Article},
	abstract = {<p>
	Nitrogen doping has become a fundamental approach to enhance the catalytic performance of carbon materials across various applications. The introduction of nitrogen creates defects and active sites, promoting the formation of small metal particles and strengthening the metal-support interaction within carbon materials. However, the challenge lies in developing sustainable and cost-effective methods for synthesizing nitrogen-doped carbon materials. In this study, we present a sustainable approach for the synthesis of ruthenium on nitrogen-doped carbon catalysts (Ru-CCP) using chitosan as a nitrogen and carbon source. Unlike traditional methods, our process avoids the use of additional nitrogen precursors and templates, streamlining the synthesis while using a renewable resource. The synthesized material exhibits an exceptional performance in the electrochemical hydrogen evolution reaction (HER) in alkaline conditions by achieving a current density of 25 mA cm(-2) at an impressively low overpotential of 46 mV, outperforming Pt/C under similar conditions. The detailed studies on structural and electronic properties of the materials using X-ray absorption spectroscopy (XAS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and transmission electron microscopy (TEM) revealed that the remarkable catalytic activity is upheld by the unique interplay between Ru delta+ and surface nitrogen moieties, notably pyridinic and pyrrolic nitrogen. Here, we demonstrate the control of particle size and electronic environment around the metal atom via the interaction of nitrogen and unravel the role of nitrogen doping in tuning the catalytic performance. In addition, this work offers insights into efficient HER catalyst design and emphasizes the potential of biomass-derived materials like chitosan in advancing clean hydrogen production for renewable energy applications.</p>
},
	issn = {0897-4756},
	doi = {10.1021/acs.chemmater.3c03169},
	author = {Korampattu, Lavanya and Barik, Sidharth and Pandikassala, Ajmal and Urkude, Rajashri R. and Kurungot, Sreekumar and Dhepe, Paresh L.}
}
@article {49195,
	title = {Transient Electro-Graphitization of MOFs Affecting the Crystallization of Ruthenium Nanoclusters for Highly Efficient Hydrogen Evolution},
	journal = {ADVANCED FUNCTIONAL MATERIALS},
	volume = {34},
	year = {2024},
	month = {AUG},
	type = {Journal Article},
	keywords = {amorphous ruthenium, crystallization control, graphitic nanostructure},
	issn = {1616-301X},
	doi = {10.1002/adfm.202315460},
	author = {Karim, Golam Masud and Patra, Amalika and Deb, Sujit Kumar and Upadhya, Hemanta and Das, Snehasish and Mukherjee, Priyam and Ahmad, Waleed and Barman, Narad and Thapa, Ranjit and Dambhare, V, Neha and Rath, Arup Kumar and Das, Jaysri and Manna, Uttam and Urkude, Rajashri R. and Oh, Youngtak and Maiti, Uday Narayan}
}
