01589nas a2200217 4500008004100000022001400041245010700055210006900162260000900231300001600240490000700256520085900263100002001122700001701142700001701159700002501176700001801201700001801219700001701237856011701254 2025 eng d a1477-922600aAtomically dispersed Co-Cu dual active sites in carbon networks as an efficient oxygen electrocatalyst0 aAtomically dispersed CoCu dual active sites in carbon networks a cOCT  a15500-155110 v543 a

Single-atom metal-based electrocatalysts offer extended advantages by maximizing the utilization of active sites but often suffer from complex synthesis processes and low-density metal loading. The present work showcases a strategic design for integrating highly dense cobalt-copper dual atoms dispersed on a nitrogen-rich porous carbon network (CoCu-NGC). The atomically dispersed CoCu-NGC outperforms the ORR and OER activities of their single metallic counterparts (Co-NGC or Cu-NGC) and conventional noble-metal based electrocatalysts (Pt/C and RuO2). Benefitting from the electronic modulation in the dual SAC system, the CoCu-NGC displayed outstanding bifunctional performance with low Delta E values of 0.69 V in freshwater and 0.78 V in seawater, highlighting it as a potential alternative to the costly state-of-art electrocatalysts.

1 aSinha, Nibedita1 aDas, Chandni1 aPal, Santanu1 aUrkude, Rajashri, R.1 aAhmed, Tanbir1 aGhosh, Biplab1 aRoy, Poulomi uhttps://library.ncl.res.in/content/atomically-dispersed-co-cu-dual-active-sites-carbon-networks-efficient-oxygen02252nas a2200265 4500008004100000022001400041245012200055210006900177260000800246300001200254490000700266520136800273653002101641653002301662653002001685653002401705653002301729100001701752700002001769700001801789700001701807700001801824700001701842856012701859 2025 eng d a1613-681000aChlorophobic iron hydrogen phosphite as OER-active electrocatalyst in anion exchange membrane (sea)water electrolysis0 aChlorophobic iron hydrogen phosphite as OERactive electrocatalys cAUG a25057810 v213 a

Seawater electrolysis is recognized as a promising technology to cater to the worldwide drive for sustainable hydrogen production; however, its practical viability is often hindered by the inevitable anode corrosion arising from the electrode side reactions owing to the presence of high chloride content which eventually degrade the electrode performance eventually. Herein, the design of unprecedented ammonium iron hydrogen phosphite (FeHPhi) along with a trace amount of Cu, is reported as the unique and much desired electrode material for seawater electrolysis due to its special chloride repellant nature along with great electrocatalytic activity toward water oxidation. The [HPO3](2-) oxoanion as Lewis base in the structure effectively restricts chloride ions, while the Fe center acts as Lewis acid offering an active site for water oxidation, also well-supported theoretically. Leveraging this frustrated Lewis pair combination, the electrocatalyst achieves a high current density of 500 mA cm(-2) at 344 mV overpotential in alkaline real seawater with impressive robustness to sustain for 200 h when operated under chlorine evolution reaction dominating region (>2 V). The electrocatalyst also demonstrates superior performance in anion exchange membrane freshwater and seawater electrolysis, demonstrating its potential applicability.

10aAEM electrolyzer10achloride repellant10aelectrocatalyst10ahydrogen production10aseawater oxidation1 aDas, Chandni1 aSinha, Nibedita1 aNair, Aathira1 aPal, Santanu1 aJoshi, Kavita1 aRoy, Poulomi uhttps://library.ncl.res.in/content/chlorophobic-iron-hydrogen-phosphite-oer-active-electrocatalyst-anion-exchange-membrane02411nas a2200241 4500008004100000022001400041245015000055210006900205260000900274300001600283490000600299520157000305653002001875653001901895653002101914653002001935653001601955100002001971700001701991700001702008700001702025856012702042 2025 eng d a2574-096200aEnergy-saving H2 production through H2S electrolysis accompanying solid sulfur recovery using a Ni3S2/Ni3N heterostructure as the electrocatalyst0 aEnergysaving H2 production through H2S electrolysis accompanying cSEP  a13631-136440 v83 a

The thermodynamically feasible electrochemical sulfion oxidation reaction (SOR) is advantageous for degrading the toxic H2S pollutant into the value-added chemical sulfur but often suffers from catalyst passivation due to blockage of electroactive sites by accumulation of solid sulfur. The strategic design of electrocatalysts with enhanced electrochemical activity and improved sulfur tolerance is thereby crucial to fully harness the benefits of the SOR. In this work, we developed nickel sulfide nanorods decorated with nickel nitride nanoparticles directly grown on conductive nickel foam as an efficient trifunctional electrocatalyst for the SOR, oxygen evolution reaction (OER), and hydrogen evolution reaction (HER). Optimized Ni3S2/Ni3N showed lower electrode potentials of 0.25, 1.487, and 0.89 V to achieve a benchmark current density of 10 mA cm(-2) for the SOR, OER, and HER, respectively. The hybrid H2S electrolysis setup employing a Ni3S2/Ni3N electrocatalyst drastically reduced the cell potential by 1.24 V compared to that of conventional water electrolysis at a current density of 200 mA cm(-2). Having said that, heterostructure formation not only enhances the activity for the SOR but also helps to avoid sulfur poisoning, enabling the electrocatalyst to sustain for 100 long hours at a high current density of 100 mA cm(-2). Consequently, the approach with the developed electrocatalyst has the ability to reduce the energy consumption by 59.22%, which can make rigorous, economically viable H-2 production driven by solar energy.

10aenergy-economic10aH-2 production10aH2S electrolysis10aheterostructure10asolidsulfur1 aSinha, Nibedita1 aDas, Chandni1 aPal, Santanu1 aRoy, Poulomi uhttps://library.ncl.res.in/content/energy-saving-h2-production-through-h2s-electrolysis-accompanying-solid-sulfur-recovery02529nas a2200277 4500008004100000022001400041245014800055210006900203260000800272300001600280490000700296520157200303653001901875653002401894653002201918653002901940653001601969653002301985100001702008700002002025700001702045700002302062700001802085700001702103856013102120 2025 eng d a1944-824400aEnhanced electrocatalytic performances of NiCr layered double hydroxides by oxalate intercalation in anion exchange membrane water electrolysis0 aEnhanced electrocatalytic performances of NiCr layered double hy cJUN a37863-378780 v173 a

Layered double hydroxides (LDHs) have attracted much attention these days in the field of water electrolysis due to easy modulation in their layered structure and properties. Herein, NiCr-LDH has been developed, and its interlayer spacing has been considerably increased by oxalate intercalation. Such increased interlayer spacing allows easy access of hydroxides to a large number of electroactive sites and thereby boosts the electrocatalytic performances both for oxygen and hydrogen evolution reactions. Being very active toward both the electrocatalytic reactions, the oxalate-intercalated NiCr-LDH was further explored in an alkaline anion exchange membrane water electrolyzer (AEMWE), achieving 800 mA cm-2 at 1.88 V cell voltage at an operating temperature of 60 degrees C. In fact, the electrolyzer efficiency has been determined to be as high as 69.66%, and the calculated H2 production cost was found to be \$0.97 per gasoline-gallon equivalent, which is well below the targeted cost by the Department of Energy, USA. The electrocatalyst was also examined in harsh alkaline media, like highly saline or seawater, which also indicated its ability to carry out sustainable seawater electrolysis, restricting chlorides to a great extent. Interestingly, post-electrolysis characterization reveals the fact that oxalate decomposition aided carbonate formation within interlayers of NiCr-LDH, and high affinity toward hydroxides is responsible for restricting chlorides during the electrolysis process, apart from the great electrocatalytic activity.

10aAnion exchange10ahydrogen production10ainterlayerspacing10aLayered double hydroxide10aSustainable10awater electrolyzer1 aPal, Santanu1 aSinha, Nibedita1 aDas, Chandni1 aChauhan, Inderjeet1 aAhmed, Tanbir1 aRoy, Poulomi uhttps://library.ncl.res.in/content/enhanced-electrocatalytic-performances-nicr-layered-double-hydroxides-oxalate-intercalation02390nas a2200205 4500008004100000022001400041245014600055210006900201260000800270300001600278490000700294520164200301100001701943700002101960700001701981700002001998700001802018700001702036856013102053 2025 eng d a2040-336400aNiFeMo layered triple hydroxide and MXene heterostructure for boosted oxygen evolution reaction in anion exchange membrane water electrolysis0 aNiFeMo layered triple hydroxide and MXene heterostructure for bo cMAY a12094-121070 v173 a

Efficient, low cost and stable electrocatalysts are highly desirable for overcoming the sluggish kinetics of the oxygen evolution reaction (OER) in alkaline water electrolysis for hydrogen production. Interfacial engineering of heterostructures is quite beneficial for improving charge transfer efficiency at the interface. In this context, heterostructures of layered triple hydroxides (LTHs) and MXenes have shown great potential as OER electrocatalysts owing to their 2D-2D structure and unique physiochemical properties. Coupling LTHs with MXenes can potentially enhance their conductivity and stability, thereby boosting OER activity. In this study, we report a heterointerface between NiFeMo-LTH on Ti3C2Tx MXene, which exhibited superior catalytic activity and stability in alkaline freshwater and seawater, reducing the activation energy. Importantly, the heterostructure achieved a current density of 100 mA cm-2 at the cost of 292 mV and 340 mV overpotentials in alkaline saline water and real seawater, respectively, and showed robustness over 100 h without hypochlorite formation in alkaline real seawater, exhibiting corrosion-resistant behaviour. Moreover, NiFeMo-LTH/MXene explored in alkaline anion exchange membrane water electrolyzer (AEMWE) achieved a current density of 750 mA cm-2 at 2.16 V cell voltage at an operating temperature of 60 degrees C with an energy efficiency of 60.5%. Raman analysis and XPS analysis post stability test demonstrated easy electron transfer from LTH to MXene at the heterointerface, leading to the formation of NiOOH electroactive species that facilitated the OER activity.

1 aPal, Santanu1 aChaturvedi, Ekta1 aDas, Chandni1 aSinha, Nibedita1 aAhmed, Tanbir1 aRoy, Poulomi uhttps://library.ncl.res.in/content/nifemo-layered-triple-hydroxide-and-mxene-heterostructure-boosted-oxygen-evolution-reaction