02936nas a2200301   4500008004100000022001400041245013700055210006900192260000800261490000700269520184900276653003702125653001802162653004202180653003002222653003002252653001702282100002002299700003002319700002902349700002502378700001802403700002002421700001802441700002602459700002402485856012502509       2024                        eng d  a1613-681000aBreaking the Pt electron symmetry and OH spillover towards ptir active center for performance modulation in direct ammonia fuel cell0 aBreaking the Pt electron symmetry and OH spillover towards ptir   cDEC0 v203 a<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>
10aammonia oxidation reaction (AOR)10ad-band center10adensity functional theory (DFT) study10adirect ammonia fuel cells10ahydroxyl spillover effect10aXAS analysis1 aBarik, Sidharth1 aKharabe, Geeta, Pandurang1 aSamal, Pragnya, Paramita1 aUrkude, Rajashri, R.1 aKumar, Sachin1 aYoyakki, Athira1 aVinod, C., P.1 aKrishnamurty, Sailaja1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/breaking-pt-electron-symmetry-and-oh-spillover-towards-ptir-active-center-performance02443nas a2200313   4500008004100000022001400041245012100055210006900176260000800245490000600253520146100259653000801720653001701728653000801745653001501753653000801768653001501776100001801791700002001809700003001829700001701859700002201876700001401898700002201912700002101934700002101955700002401976856012902000       2025                        eng d  a2366-748600aBinder-free in situ interface reconstruction of NiMoO4 nanorods over Ni(OH)2 nanosheets for efficient urea oxidation0 aBinderfree in situ interface reconstruction of NiMoO4 nanorods o  cDEC0 v93 a<p>
	Replacing the energy-intensive oxygen evolution reaction (OER) with the urea oxidation reaction (UOR) in electrochemical water splitting offers simultaneous green hydrogen production and urea-rich wastewater oxidation, enhancing energy efficiency and economic viability. In this study, a non-noble metal-based binder-free NiMoO4/Ni(OH)2/NF electrocatalyst is developed, featuring NiMoO4 nanorods anchored on Ni(OH)2 nanosheets. This unique morphology facilitates a highly active in situ reconstructed interface, delivering a current density of 134 mA cm-2 at 1.40 V (vs RHE) in 1 m KOH with 0.33 m urea, significantly outperforming its individual components. The catalyst demonstrates excellent stability over 50 h at 30 mA cm-2. When integrated into an anion exchange membrane urea electrolyser (13 cm2 area) with Pt@C/NF as the HER cathode, the system achieves 192 mA cm-2 at 1.60 V. The post-UOR studies confirm the presence of an amorphous NiMoO4-crystalline Ni(OH)2 interface, which plays a key role in enhancing the availability of the active sites to enhance the UOR performance. The improved electrochemical performance of the engineered catalyst can be ascribed to the in situ reconstructed amorphous-crystalline interface, optimal hydrophilicity, reduced charge transfer resistance, and the distinct morphology. This strategy offers a promising pathway for developing highly active electrocatalysts for energy conversion applications.</p>
10aAEM10aelectrolyser10aOWS10atomography10aUOR10awastewater1 aKumar, Yogesh1 aBarik, Sidharth1 aKharabe, Geeta, Pandurang1 aTorris, Arun1 aSingh, Mayank, U.1 aMohan, S.1 aGalave, Chaitanya1 aTekawadia, Jyoti1 aKanawade, Rajesh1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/binder-free-situ-interface-reconstruction-nimoo4-nanorods-over-nioh2-nanosheets-efficient