02305nas a2200313 4500008004100000022001400041245012200055210006900177260000900246300001200255490000800267520128400275653000801559653000801567653000801575653001001583653005201593100001801645700001901663700002801682700002201710700001701732700002001749700002301769700002401792700002201816700002301838856013001861 2021 eng d a0021-979700aEnhanced electrocatalytic activity of PtRu/nitrogen and sulphur co-doped crumbled graphene in acid and alkaline media0 aEnhanced electrocatalytic activity of PtRunitrogen and sulphur c cMAY  a154-1630 v5903 a

The low mass activity and high price of pure platinum (Pt)-based catalysts predominantly limit their large-scale utilization in electrocatalysis. Therefore, the reduction of Pt amount while preserving the electrocatalytic efficiency represents a viable alternative. In this work, we prepared new PtRu2 nanoparticles supported on sulphur and nitrogen co-doped crumbled graphene with trace amounts of iron (PtRu2/PF) electrocatalysts. The PtRu2/PF catalysts exhibited enhanced electrocatalytic performance and stability for the hydrogen evolution reaction (HER) at pH = 0. Moreover, the prepared PtRu2/PF electrocatalyst displayed higher HER activity than commercial 20% Pt/C. The PtRu2/PF catalyst achieved a current density of 10 mA cm(-2) at an overpotential value of only 22 mV for HER, performing better activity than many other Pt-based electrocatalysts. Besides, the PtRu2/PF revealed a good performance for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) in alkaline media. The PtRu2/PF catalyst recorded a current density of 10 mA cm(-2) at an overpotential of only 270 mV for OER in KOH (1.0 M) solution and an onset potential of 0.96 V vs. RHE (at 1 mA cm(-2)) for ORR in KOH (0.1 M) solution. (C) 2021 Elsevier Inc. All rights reserved.

10aHER10aOER10aORR10aPtRu210aSulphur and nitrogen co-doped crumbled graphene1 aPang, Liuqing1 aMiao, Yuanyuan1 aBhange, Siddheshwar, N.1 aBarras, Alexandre1 aAddad, Ahmed1 aRoussel, Pascal1 aAmin, Mohammed, A.1 aKurungot, Sreekumar1 aSzunerits, Sabine1 aBoukherroub, Rabah uhttp://library.ncl.res.in/content/enhanced-electrocatalytic-activity-ptrunitrogen-and-sulphur-co-doped-crumbled-graphene-acid02470nas a2200301 4500008004100000022001400041245011900055210006900174260000800243300001600251490000700267520146700274653001401741653003601755653001801791653000801809653001801817100002501835700002201860700002001882700002201902700001501924700002801939700002501967700002001992700002902012856012702041 2022 eng d a1944-824400aImprovement in oxygen evolution performance of NiFe layered double hydroxide grown in the presence of 1T-Rich MoS20 aImprovement in oxygen evolution performance of NiFe layered doub cJUL a31951-319610 v143 a

NiFe layered double hydroxide (NiFe LDH) grown in the presence of MoS2 (rich in 1T phase) shows exceptional performance metrics for alkaline oxygen evolution reaction (OER) in this class of composites. The as-prepared NiFe LDH/MoS2 composite (abbreviated as MNF) exhibits a low overpotential (eta(10)) of 190 mV; a low Tafel slope of 31 mV dec(-1); and more importantly, a high stability in its performance manifested by the delivery of current output for 45 h. It is important to note that this could be achieved with an exceedingly low loading of 0.14 mg cm(-2). The mass activity of this composite (97 A g(-1)) is about 14 times greater than that of the conventional RuO2 (7 A g(-1) ) at eta = 200 mV. When normalized with respect to the total metal content, a mass activity of 1000 A g(-1) (eta = 300 mV) was achieved. Impedance analysis further reveals that the significant reduction in charge-transfer resistance and hence high current density (5 times greater as compared to NiFe LDH at eta = 300 mV) observed for MNF is associated with interfacial adsorption kinetics of intermediates (R-1). Significant enhancement in the intrinsic activity of MNF over LDH has been observed through normalization of current with the electrochemically active surface area. Computational studies suggest that the Ni centers in the composite act as the active sites for OER, which is well-corroborated with the observed postreaction appearance of Ni3+ species.

10aImpedance10aLDH-MoS2 hybrid electrocatalyst10amass activity10aOER10aoverpotential1 aChakraborty, Soumita1 aMarappa, Shivanna1 aAgarwal, Sakshi1 aBagchi, Debabrata1 aRao, Ankit1 aVinod, Chathakudath, P.1 aPeter, Sebastian, C.1 aSingh, Abhishek1 aEswaramoorthy, Muthusamy uhttp://library.ncl.res.in/content/improvement-oxygen-evolution-performance-nife-layered-double-hydroxide-grown-presence-1t02196nas a2200217 4500008004100000022001400041245011600055210006900171260000800240300001000248490000700258520141700265653003201682653002201714653002201736653003401758653000801792100003101800700002701831856012001858 2024 eng d a0360-319900aNanocrystalline (NixCo(1-x))3(PO4)2@FeSe2/NF as a promising OER electrocatalyst for alkaline water electrolysis0 aNanocrystalline NixCo1x3PO42FeSe2NF as a promising OER electroca cMAR a74-810 v593 a

Affordable and sustainable hydrogen production is the need of the hour owing to the mounting global pursuit for the hydrogen economy. Water splitting is the premier go -to method to produce green hydrogen at a larger scale in which the half -cell Oxygen Evolution Reaction (OER) demands a larger amount of energy expenditure due to its sluggish kinetics. Hence, designing an efficient OER electrocatalyst, especially for alkaline water electrolysis that offers alternatives to the usage of precious group metals is a pressing priority. Herein, we report a novel nanocrystalline electrocatalyst consisting of two components, namely cobalt nickel phosphate and iron diselenide synthesised via a two-step electrodeposition at room temperature. The combination of the two components on the porous nickel foam substrate exhibits an overpotential of 272 mV at 100 mA/cm2 in 1 M KOH showing a low Tafel slope of a mere 38 mV/dec with appreciable retention even after 24 h of stability test at a relatively higher current density. The surface reconstruction that occurs when FeSe2 is electrodeposited on (Ni0.35Co0.65)3(PO4)2@NF and the synergy between the two components is the primary reason for the improved performance. Thus, this work highlights the ambient synthesis of a highly durable earth -abundant metal -based electrocatalyst which exceeds the performance of the standard Ru/C by a decent margin.

10aAlkaline Water Electrolysis10aAmbient synthesis10aElectrodeposition10aNon-PGM based Electrocatalyst10aOER1 aChristi, Darren, Sebastian1 aSelvaraj, Kaliaperumal uhttp://library.ncl.res.in/content/nanocrystalline-nixco1-x3po42fese2nf-promising-oer-electrocatalyst-alkaline-water