01900nas a2200181   4500008004100000022001400041245012300055210006900178260000900247300001400256490000600270520122500276100002101501700002001522700002301542700002401565856012901589       2020                        eng d  a2516-023000aNiFe layered double hydroxide-decorated N-doped entangled-graphene framework: a robust water oxidation electrocatalyst0 aNiFe layered double hydroxidedecorated Ndoped entangledgraphene   cAPR   a1709-17170 v23 a<p>Three dimensional (3D) porous carbon materials are highly desirable for electrochemical applications owing to their high surface area and porosity. Uniformly distributed porosity in the 3D architecture of carbon support materials allows reactant molecules to access more electrochemically active centres and simultaneously facilitate removal of the product formed during electrochemical reactions. Herein, we have prepared a nitrogen-doped entangled graphene framework (NEGF), decorated with NiFe-LDH nanostructures by an in situ solvothermal method followed by freeze-drying at high vacuum pressure and low temperature. The freeze-drying method helped to prevent the restacking of the graphene sheets and the formation of a high surface area nitrogen-doped entangled graphene framework (NEGF) supported NiFe-LDHs. The incorporation of the NEGF has significantly reduced the overpotential for the electrochemical oxygen evolution reaction (OER) in 1 M KOH solution. This corresponds to an overpotential reduction from 340 mV for NiFe-LDHs to 290 mV for NiFe-LDH/NEGF to reach the benchmark current density of 10 mA cm(-2). The preparation of the catalyst is conceived through a low-temperature scalable process.</p>
1 aManna, Narugopal1 aAyasha, Nadeema1 aSingh, Santosh, K.1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/nife-layered-double-hydroxide-decorated-n-doped-entangled-graphene-framework-robust-water02891nas a2200313   4500008004100000022001400041245016200055210006900217260000800286300001400294490000700308520176200315653003302077653002402110653001402134653002502148653001302173653004502186653003402231100003002265700001802295700002002313700002502333700002002358700001802378700002602396700002402422856013102446       2025                        eng d  a1944-824400aHydrogel electrolyte-mediated in situ Zn-anode modification and the Ru-RuO2/NGr-coated cathode for high-performance solid-state rechargeable Zn-air batteries0 aHydrogel electrolytemediated in situ Znanode modification and th  cJAN  a3188-32040 v173 a<p>
	This work aims to deal with the challenges associated with designing complementary bifunctional electrocatalysts and a separator/membrane that enables rechargeable zinc-air batteries (RZABs) with nearly solid-state operability. This solid-state RZAB was accomplished by integrating a bifunctional electrocatalyst based on Ru-RuO2 interface nanoparticles supported on nitrogen-doped (N-doped) graphene (Ru-RuO2/NGr) and a dual-doped poly(acrylic acid) hydrogel (d-PAA) electrolyte soaked in KOH with sodium stannate additive. The catalyst shows enhanced activity and stability toward the two oxygen reactions, i.e., oxygen reduction and evolution reactions (ORR and OER), with a very low potential difference (Delta E) of 0.64 V. The computational insights bring out the electronic factors contributing to the enhanced catalytic activity of Ru-RuO2/NGr based on the charge density difference (CDD) between the interfaces. The disadvantages of the existing solid-state RZABs, such as their limited lifespan brought on by passivation, dendritic growth, corrosion, and shape change, have also been taken into account. The introduction of the stannate additive to the electrolyte induced an in situ Zn-anode modification, which subsequently improved the interfacial stability of the ZABs and, hence, the battery life cycles. The experimental observations reveal that, during the charging process, the Sn nanoparticles enable the homogeneous Zn deposition on the surface of the anode. Thus, the in situ Zn-anode surface modification assisted in achieving a high-rate cycle capability, viz., the homemade catalyst-based system exhibited continuous charge-discharge cycles for 20 h at a current density of 2.0 mA cm-2, with each cycle lasting for 5 min.</p>
10aBifunctional Electrocatalyst10aCore-ShellStructure10aDFT study10aelectrolyte additive10aHydrogel10asolid-state rechargeable zinc-airbattery10aX-ray absorption spectroscopy1 aKharabe, Geeta, Pandurang1 aVerma, Tushar1 aBarik, Sidharth1 aUrkude, Rajashri, R.1 aAyasha, Nadeema1 aGhosh, Biplab1 aKrishnamurty, Sailaja1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/hydrogel-electrolyte-mediated-situ-zn-anode-modification-and-ru-ruo2ngr-coated-cathode-high