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Abstract:
The anodic substitution of a sluggish oxygen evolution reaction with a more energy-saving hydrazine oxidation reaction has the potential to greatly reduce energy consumption for hydrogen production. However, the underlying mechanism of the hydrazine oxidation reaction remains ambiguous, and the existing hydrazine splitting generally requires an external power source to drive the anodic and cathodic reactions, which is not suitable for outdoor applications. In this study, we have developed a heterostructure sulfide-based catalyst that effectively catalyzes both hydrazine oxidation and hydrogen evolution reactions. Through in situ Raman spectroscopy, we have confirmed that the breakage of the nitrogen-nitrogen single bond is a pathway for the hydrazine oxidation reaction. The enhanced electrocatalytic performance is attributed to the increased active sites and accelerated electron transfer within the heterostructures, which reduced the energy barrier, thereby enabling the fabricated electrolyzer using the g-C3N4/Ni(CN)2@NiS catalyst to deliver 200 mA cm−2 with a low voltage of 0.31 V. The assembled electrolyzer can be powered by a g-C3N4/Ni(CN)2@NiS anode-equipped direct hydrazine fuel cell, achieving self-powered hydrogen production with faradaic efficiency of more than 97 %.

Keywords:
Functional electrod, Carbon nitride, Hydrogen generation, Hydrazine

Abstract:
Hydrazine oxidation (HzOR) assisted hydrogen production offers a promising
alternative to energy-intensive and sluggish oxygen evolution reaction (OER),
improving its efficiency. However, its practical implementation demands
the development of advanced electrocatalysts capable of overcoming intrinsic
kinetic and charge transfer limitations. Herein, the study reports a hybrid catalyst by anchoring a 

Keywords:
Hydrazine oxidation, Hydrogen evolution, Covalent organic framework, interfacial interaction

Abstract:
For the development of the next generation of portable energy storage devices, compression tolerant electrodes are essential, but most of previous reports focused only on carbon-based materials. Herein, gelatin methacrylate (GelMA) and poly(N-isopropylacrylamide) (PNIIPAM) were used as host to incorporate Co3O4@MoS2 Aerogel (Co3O4@MoS2 AG). The GelMa-PNIPAM (GP) was transformed into carbon network as an intrinsically compressible host template with high conductivity. The as-prepared electrode possesses a reversible compressive strain of 80% with excellent durability. Density functional theory (DFT) calculations show that the Co3O4@MoS2-AG heterostructure exhibits high electronic conductivity, low adsorption energy for OH- ions and fast electron transfer capacity, which enhance the electrochemical performance with high specific capacitance of 1026.9 at 1 A g-1 with remarkable cycling stability of 80.8% after 10,000 charge-discharge cycles. Besides, the assembled asymmetric supercapacitor based on compressible Co3O4@MoS2 AG/RGO exhibits stable energy storage performance under different compressive strains and after 100 compression-release cycles. The results of this study demonstrate the potential of metal-based electrode with high energy storage properties for wearable devices.

Keywords:
Compressible electrode, Assymetric supercapacitor, Aerogel, CO3O4, MoS2

Abstract:
Catalyst design plays a critical role in ensuring sustainable andeffective energy conversion. Electrocatalytic materials need tobe able to control active sites and introduce defects in bothacidic and alkaline electrolytes. Furthermore, producing efficientcatalysts with a distinct surface structure advances ourcomprehension of the mechanism. Here, a defect-engineeredheterointerface of ruthenium doped cobalt metal organic frame(Ru-CoMOF) core confined in MoS2 is reported. A tailored designapproach at room temperature was used to induce defects andform an electron transfer interface that enhanced the electro-catalytic performance. The Ru-CoMOF@MoS2 heterointerfaceobtains a geometrical current density of 10 mA-2 by providinghydrogen evolution reaction (HER) and oxygen evolutionreaction (OER) at small overpotentials of 240 and 289 mV,respectively. Density functional theory simulation shows thatthe Co-site maximizes the evolution of hydrogen intermediateenergy for adsorption and enhances HER, while the Ru-site, onthe other hand, is where OER happens. The heterointerfaceprovides a channel for electron transfer and promotes reactionsat the solid-liquid interface. The Ru-CoMOF@MoS2 modelexhibits improved OER and HER efficiency, indicating that itcould be a valuable material for the production of water-alkaline and acidic catalysts