Hybrid Structure Of Nanoparticles Research Articles

Fabricating Spinel-Type High-Entropy Oxides of (Co, Fe, Mn, Ni, Cr)3O4 for Efficient Oxygen Evolution Reaction.

Fabricating efficient oxygen evolution reaction (OER) electrocatalysts is crucial for water electrocatalysis. Herein, the spinel-type high-entropy oxides of (Co, Fe, Mn, Ni, Cr)3O4 were synthesized through the high-temperature calcination approach. The influences of calcination temperatures on structures and electrochemical properties were investigated. The optimized catalyst of HEO-900 contains the hybrid structure of regular polyhedrons and irregular nanoparticles, which is beneficial for the exposure of electrochemically active sites. It was identified that the abundant high-valence metal species of Ni3+, Co3+, Fe3+, Mn4+, and Cr3+ are formed during the OER process, which is generally regarded as the electrochemically active sites for OER. Because of the synergistic effect of multi-metal active sites, the optimized HEO-900 catalyst indicates excellent OER activity, which needs the overpotential of 366 mV to reach the current density of 10 mA cm-2. Moreover, HEO-900 reveals the prominent durability of running for 24 h at the current density of 10 mA cm-2 without clear delay. Therefore, this work supplies a promising route for preparing high-performance multi-metal OER electrocatalysts for water electrocatalysis application.

Develop Synthesis and Characterization of Dual-Faced Porous Silicon/Gold Nanoparticle Hybrid Structures

Develop Synthesis and Characterization of Dual-Faced Porous Silicon/Gold Nanoparticle Hybrid Structures

One-step process to obtain manganese-assisted laser-induced multi-layer graphene-like carbon supercapacitor

Laser-induced graphene (LIG) technology has made it possible to prepare graphene-based supercapacitors on a large scale and at low cost. However, the performance of graphene-based supercapacitors fabricated solely by laser still has a great potential for improvement. In this work, we obtained high-performance supercapacitors based on manganese-assisted laser-induced multi-layer graphene-like carbon (MLIGC) by a simple process. Poly-(m-phenylene isophthalamide) (PMIA) papers treated with modifier (KMnO4) were used as substrates. Modifier not only deepened the cross-sectional carbonization and achieveed uniform dispersing of manganese oxide nanoparticles, but also changeed the surface properties of MLIGC. Benefit from the hybrid structure of manganese oxide nanoparticles uniformly dispersed inside multi-layer graphene-like carbon (LIGC) prepared by one-step laser process, the combination of electric double-layer capacitance and pseudocapacitance allows for a further breakthrough in capacity while maintaining excellent cycling stability. Specifically, the supercapacitors achieve an area capacity of 72.4 mF cm−2 at 0.2 mA cm−2, which is 25 times higher than the control. In addition to the significant capacity increase, the addition of the modifier also achieveed a significant impedance reduction (almost one ninth of the control) and demonstrateed excellent cycling stability (nearly 100 % capacity retention after 7500 cycles at 10 mA cm−2). More importantly, the method is simple, fast, low-cost and high-efficiency, which provides a new path for the large-scale preparation of planar carbon-based supercapacitors.

Visible light‐enhanced and degradable SERS substrates based on g‐C3N4/Au NP hybrid structures

AbstractIn this study, a visible light‐activated and degradable surface‐enhanced Raman spectroscopy (SERS) substrate was fabricated based on graphite carbon nitride (g‐C3N4) and gold nanoparticle (Au NP) hybrid structures. By using porous structure of g‐C3N4 as the support, Au NP arrays can be formed through sputtering of a thin Au film. Typical surface Raman enhancement effect can be observed by using p‐toluenethiol as the probe molecule. Interestingly, it was found that the Raman signal of probe molecules could be enhanced 2.7 times by pre‐illumination of visible light for a short time within 2 min, while the Raman signal decreased significantly about five times with further long‐term irradiation of more than 60 min. The electromagnetic enhancement effect of Au NP array on semiconductor materials with various extinction coefficients was studied by FDTD simulations. Furthermore, a charge transfer enhancement mechanism was proposed based on band structure of g‐C3N4/Au NP hybrid substrate and molecular orbitals. Our experimental and simulation results demonstrated an approach to construct a visible light‐activated SERS substrate with enhancement and degradation properties based on porous organic semiconductors.

The hybrid structure of nanoflower-like CoxMnyNizO4 nanoparticles embedded biomass-lignin carbon nanofibers as free-standing and binder-free electrodes for high performance supercapacitors

We introduced the concept of a novel hybrid faradaic structure as a mechanism to improve the performance of biomass-derived carbon-based supercapacitors (SCs). Organic-inorganic hybrid composition, nanostructures, porosity, surface area and active redox reactions were carefully designed. We reported the facile, cost-effective and environmentally friendly fabrication of pure lignin carbon nanofibers (LCNFs) incorporated with flower-like, multi-metal and intrinsically capacitive ([email protected]2) nanoparticles in a flexible and binder-free electrode for SCs by the electrospinning technique using various electrolytes (1 M Na2SO4, 0.5 M KI and 1 M Na2SO4 +0.5 M KI). Mechanically robust LCNFs were used as a free-standing electrode and characterized for electrochemical performance using a two-electrode system in a Swagelok cell. Specific capacitance of the LCNFs in 1 M Na2SO4 electrolyte (current density 0.1 A/g) of 129 F/g increased to 200 F/g when adding 1 % manganese oxide nanoparticles that introduced intrinsic capacitance into the nanofibers. This value further increased to 303 F/g by adding 1 % Ni-Co to the manganese oxide. The nanoflower morphology significantly increased the surface area via micro and mesopore modification on carbonization and via macropore expansion on activation. After applying a mixed electrolyte (1 M Na2SO4 + 0.5 M KI), the capacitance reached 400 F/g and remained stable up to 1000 GDC cycles. Using the same composite nanofibers, 1,021 F/g was achieved using 0.5 M KI as an electrolyte. However, the latter system appeared unstable beyond 200 GDC cycles, suggesting that it can be applied as a disposable fast-charge supercapacitor. In the presence of a chemically-stable, highly-porous and partially-conductive carbon matrix, we concluded that interplay between the multi-metal oxides and electrolytes increased oxidation numbers, thereby boosting the faradaic reaction and enhancing electronic conductivity.

Vanadium hexacyanoferrate nanoparticles connected by cross-linked carbon nanotubes conductive networks for aqueous zinc-ion batteries

Prussian blue analogues (PBAs) have attracted increasing attention in the field of aqueous zinc-ion batteries (AZIBs) with the advantages of an open framework with adjustable valence and easy synthesis. However, due to the disadvantages of unstable structure and insufficient active sites, PBAs as cathode materials for AZIBs still have problems such as low specific capacity or poor cycle performance. In this work, a simple in-situ co-precipitation method is used to grow vanadium hexacyanoferrate (VHCF) nanoparticles on carbon nanotubes (CNTs), which aims to improve the conductivity of electrode materials by introducing a conductive skeleton of CNTs. This hybrid structure of VHCF nanoparticles and CNTs promotes electron transport between VHCF nanoparticles, thereby effectively improving the utilization of the material. Benefiting from the inherent sufficient channels for ions insertion/extraction of VHCF and the excellent conductivity of CNTs, the VHCF/CNTs hybrid as AZIBs cathode material shows excellent zinc storage performance with a high reversible capacity of 97.8 mAh g−1 at 50 mA g−1 and a discharge specific capacity of 52.7 mAh g−1 after 1000 cycles at 3200 mA g−1. This work provides a new idea for the design of high-performance PBAs-based cathodes for AZIBs.

MoO3-templated synthesis of TiO2@C-Ni microtubes for efficient catalysis and protein adsorption

The hybrid structure of metallic Ni nanoparticles (NPs)-decorated micro/nanotubes has the merits of both unique property of Ni NPs and tubular structure of micro/nanotubes, which is highly desired for many applications. In this study, Ni NPs decorated porous TiO2 microtubes with N-doped carbon layer from polydopamine (PDA) are directly synthesized by an extend stöber method, mussel chemistry and subsequent annealing treatment for the first time. In the synthetic process, a shell layer of nickel ion-embedded in polydopamine (PDA-Ni2+) was covered on the MoO3@TiO2 microcables by nickel ion mediated dopamine polymerization in ammonia solution, resulting in the formation of amorphous TiO2@PDA-Ni2+ microtubes. Notably, the coating of PDA-Ni2+ layer and the dissolution of the MoO3 cores were easily achieved within one-step reaction, greatly facilitating the synthetic progress. After being annealed in nitrogen atmosphere at different temperature, the TiO2@C-Ni microtubes with anatase, rutile phase of TiO2 can be obtained. Benefiting from the high coverage of Ni NPs, large specific surface area as well as one dimensional tubular structure, the as-prepared TiO2@C-Ni microtubes exhibited excellent performance on adsorption for histidine-rich proteins as well as the reduction of 4-nitrophenol. These results may pave a new avenue on constructing 1D TiO2-based microtubes for potential applications in energy storage, photocatalysis etc.

Plasmon-enhanced dye-sensitized solar cells through porphyrin-silver nanoparticle hybrid structures: Experimental and computational studies

Surface plasmon resonance of silver nanoparticles (Ag NPs) was used to improve light absorption of porphyrins in plasmon-enhanced porphyrin-sensitized solar cells (PSSCs). Porphyrins with different substituents consisting –H, -Me, -MeO, –F, -Cl, -Br, –CO2H, –SO3H, –NO2, and –NH2 were used to study the effect of the interactions between photoactive dye molecules and plasmonic Ag NPs on the performance of PSSCs. The obtained results revealed that zinc tetra(4-carboxyphenyl)porphyrin and zinc tetra(4-aminophenyl)porphyrin have made the biggest impact on the performance of plasmon-enhanced PSSCs. Computational studies were done to study the electronic properties of porphyrin molecules with electron-withdrawing and electron-donating substituents interacted with Ag NPs. The theoretical studies confirmed that the electronic nature of substituents of porphyrins has a considerable effect on the electronic properties of porphyrin-AgNPs systems. In continue, [email protected] core-shell NPs were prepared to overcome the challenge of corrosion of Ag plasmonic nanoparticles. The results showed that using [email protected] systems, in many cases, the performance of PSSCs is increased relative to corresponding porphyrins but is decreased relative to porphyrin-AgNPs systems.

Paper-Based Electrochemical Biosensors for Voltammetric Detection of miRNA Biomarkers Using Reduced Graphene Oxide or MoS2 Nanosheets Decorated with Gold Nanoparticle Electrodes.

Paper-based biosensors are considered simple and cost-efficient sensing platforms for analytical tests and diagnostics. Here, a paper-based electrochemical biosensor was developed for the rapid and sensitive detection of microRNAs (miRNA-155 and miRNA-21) related to early diagnosis of lung cancer. Hydrophobic barriers to creating electrode areas were manufactured by wax printing, whereas a three-electrode system was fabricated by a simple stencil approach. A carbon-based working electrode was modified using either reduced graphene oxide or molybdenum disulfide nanosheets modified with gold nanoparticle (AuNPs/RGO, AuNPs/MoS2) hybrid structures. The resulting paper-based biosensors offered sensitive detection of miRNA-155 and miRNA-21 by differential pulse voltammetry (DPV) in only 5.0 µL sample. The duration in our assay from the point of electrode modification to the final detection of miRNA was completed within only 35 min. The detection limits for miRNA-21 and miRNA-155 were found to be 12.0 and 25.7 nM for AuNPs/RGO and 51.6 and 59.6 nM for AuNPs/MoS2 sensors in the case of perfectly matched probe-target hybrids. These biosensors were found to be selective enough to distinguish the target miRNA in the presence of single-base mismatch miRNA or noncomplementary miRNA sequences.

Synthesis of fluorescent graphene quantum dots from graphene oxide and their application in fabrication of GQDs@AgNPs nanohybrids and sensing of H2O2

Graphene oxide (GO) with hydrophilic properties supports the scalable production of highly desirable material graphene. GO nanosheets were prepared with a modified Hummers method, whereas the oxidative cutting technique was used to synthesize graphene quantum dots (GQDs). The surface and structural morphology of both GO and GQDs were examined and compared. In GO, photoluminescence originated mainly due to the conductive electrons present in the sp2 localized sites and the excimer formation. In contrast, in GQDs, PL is increased due to numerous defects present on their surfaces. The pH plays a crucial role in tuning the blue and green PL of GQDs hence the optical properties. The developed GQDs with functional groups act as a solo reducing and stabilizing agent in producing the GQDs-silver nanoparticles (GQDs@AgNPs) hybrid structure, which exhibits strong surface plasmon resonance along with GQDs absorption. Further, GQDs alone support sensing of hydrogen peroxide (H2O2) in an aqueous medium, thus acting as a sensing probe like the GQDs@AgNPs nanohybrids.

Fabrication and Measurement of Fiber Optic Localized Surface Plasmon Resonance Sensor Based on Hybrid Structure of Dielectric Thin Film and Bilayered Gold Nanoparticles

Localized surface plasmon resonance (LSPR) sensor with hybrid structure of dielectric thin film and bilayered gold nanoparticles (AuNPs) on an optical fiber is proposed to enhance the sensitivity. The increased number of nanoparticles per unit plane due to the bilayer structure contributes to the upgrade in the sensitivity by improving the LSPR effect and extending the sensing area. The bilayered AuNPs will be particularly important in the application of fiber optic LSPR (FO LSPR) sensors because the optical fiber has a small cross-sectional area. The Al <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> thin film by atomic layer deposition is inserted between the first and second layers of AuNPs. The dielectric spacer can also help to improve the sensitivity by concentrating the electric field due to its high refractive index and ensuring a nanometer gap between nanoparticles. The monolayer and bilayer with AuNPs are prepared on the optical fibers, respectively. In each FO LSPR sensor, refractive index sensitivities are also analyzed and compared. In the sensor with bilayered AuNPs, a sensitivity improvement of approximately 2.3 times is confirmed. This strategy can be a breakthrough to increase the sensing area of the FO LSPR sensor without modifying the structure of the optical fiber.

Electrochemical stability of TiO2 nanotubes deposited with silver and gold nanoparticles in aqueous environment

Nano-modification of titanium nanotubes (TNT), especially the incorporation of metal nanoparticles is very common and allows to achieve unique properties. However, current research is focused on developing a new method of covering with metal nanoparticles and specifying its properties, completely omitting the mechanism of nanoparticle growth on nanotubes and its stability.The aim of this work was to elaborate the titanium nanotube-silver/gold nanoparticle hybrid structure, examine its stability in aqueous solution, i.e. phosphate buffered saline (PBS), and Milli-Q water, as well as carry out the electrochemical characteristics of a hybrid structure.The first significant observation is no differences in nanotubes-nanoparticles structure is observed in PBS solution, which is commonly used by other authors. The obtained results measured in Milli-Q water indicated that gold nanoparticles were definitely less stable on titanium nanotubes surface than the silver nanoparticles. Stability ranges for AgNPs and AuNPs on the surface of TNT were established. The optimal volume used in washing procedure was 1−10 ml per 1 cm2 of TNT for AgNPs/TNT and 10−33 μl per 1 cm2 of TNT for AuNPs/TNT. Additionally, the electrochemical analysis confirmed that AgNPs/TNT are characterized by higher resistance, and lower reactance, which suggests that this kind of functionalization is more appropriable for biosensing. However, AuNPs/TNT are characterized by more positive open circuit potential, and redox stability, favorable for protein/drug immobilization.

Insights into the Formation of DNA-Magnetic Nanoparticle Hybrid Structures: Correlations between Morphological Characterization and Output from Magnetic Biosensor Measurements.

Understanding the binding mechanism between probe-functionalized magnetic nanoparticles (MNPs) and DNA targets or amplification products thereof is essential in the optimization of magnetic biosensors for the detection of DNA. Herein, the molecular interaction forming hybrid structures upon hybridization between DNA-functionalized magnetic nanoparticles, exhibiting Brownian relaxation, and rolling circle amplification products (DNA-coils) is investigated by the use of atomic force microscopy in a liquid environment and magnetic biosensors measuring the frequency-dependent magnetic response and the frequency-dependent modulation of light transmission. This approach reveals the qualitative and quantitative correlations between the morphological features of the hybrid structures with their magnetic response. The suppression of the high-frequency peak in the magnetic response and the appearance of a new peak at lower frequencies match the formation of larger sized assemblies upon increasing the concentration of DNA-coils. Furthermore, an increase of the DNA-coil concentration induces an increase in the number of MNPs per hybrid structure. This study provides new insights into the DNA–MNP binding mechanism, and its versatility is of considerable importance for the mechanistic characterization of other DNA-nanoparticle biosensor systems.

Vastly improved solar-light induced water splitting catalyzed by few-layer MoS2 on Au nanoparticles utilizing localized surface plasmon resonance

Photocatalytic water splitting with few-layer MoS2 as photocatalysts has been an efficient hydrogen production method in recent years. Previous studies have shown that active edge sites play an important part in the efficiency enhancement. In this work, excellent photocatalytic properties for hydrogen production in water splitting under simulated solar light (with AM1.5G filter) with few-layer MoS2/Au nanoparticle (NPs) hybrid structures have been demonstrated. Few-layer MoS2 fabricated by thermal decomposition shows outstanding photocatalytic activity, as high as 179 mmolg−1h−1, for hydrogen production with Na2S as a sacrificial reagent. The high efficiency is attributed to high surface to volume ratio as well as huge amount of active sites of few-layer MoS2 nanoflakes. Moreover, hydrogen production efficiency was further significantly improved to 285 mmolg−1h−1 by forming few-layer MoS2 on Au NPs with optimized size and spacing utilizing both high surface to volume ratio as well as enhanced near-fields induced by localized surface plasmon resonances (LSPR). The work realizes a feasible and easily-recycled hybrid structure for highly efficient hydrogen production.

Ammonia Sensing Characteristics of a Platinum (Pt) Hybrid Structure/GaN-Based Schottky Diode

A hybrid structure of platinum nanoparticles (Pt NPs) and a Pt thin film are employed to fabricate a new Pt NP/Pt thin film/GaN-based Schottky diode-type ammonia sensor. Pt NPs are formed by a drop coating and UV illumination approach. The increased surface-area-to-volume ratio and “spillover” effect of Pt NPs are beneficial in ammonia sensing. Due to the synergistic catalytic activity of Pt NPs and Pt thin film, the studied device shows good ammonia sensing properties, including a high sensing response of 522.1 under 1000-ppm NH3/air gas at 473 K and an extremely low detecting level of 0.4-ppm NH3/air. A thermodynamic analysis is employed to study the related ammonia sensing mechanism. Furthermore, a Kalman filter and the related algorithm are introduced to effectively reduce the redundant data without affecting the original sensing results. Based on the good performance and advantages of a relatively simple structure and easy fabrication, the studied device is promising for ammonia sensing and wireless transmission applications.

Hybrid Nanostructures for Electrochemical Reduction of Carbon Dioxide

Producing fuels by reduction of carbon dioxide (CO2) is one of the key solutions that would be a groundbreaking impact not only on global energy also environmental sustainability. The success of this revolutionary technology depends on products that forms from reduction of CO2. Therefore it is important to develop effective catalytic materials for facilitating the CO2 reduction process. However, current catalysts do not have high efficiency and good selectivity. These existing catalysts are leading to multiple products. Major reported CO2 reduction catalysts are limited with two-electron reduced products that results formation of CO and formate. The formation of hydrocarbon products that have multiple proton and electron transfers is still one of the major scientific challenges that needs to be addressed. Currently, there is no identified catalyst that can facilitate CO2 reduction to selective hydrocarbon fuels with good efficiency due to the minute mechanistic understanding. Here, we will discuss tuning the hybrid structure of metal-oxide nanoparticles and two-dimensional (2D) layered materials as an efficient and selective CO2 reduction electrocatalyst with the density functional theory calculations, which reveals the unusual electrocatalytic properties of hybrid structure creating intrinsic chemical and electronic coupling and assist to understand the mechanism beyond the process.

Enhanced Plasmonic Particle Trapping Using a Hybrid Structure of Nanoparticles and Nanorods.

Plasmon-enhanced particle trapping was demonstrated using a hybrid structure of nanoparticles and nanorods. In order to intensify localized surface plasmon resonance (LSPR), gold nanoparticles (AuNPs) were deposited on zinc oxide nanorods (ZnONRs). The synergistic effect caused by the hybrid structure was identified experimentally. Numerical analysis revealed that the LSPR-induced photophysical processes such as plasmonic heating and near-field enhancement were improved by the existence of ZnONRs. The role of the ZnONR in enhancing the particle-trapping velocity was explored by examining the scattered electric field, Poynting vector, and temperature gradient over the nanostructures calculated from the simulation. It was found that polystyrene microparticles and Escherichia coli cells were successfully trapped by using the ZnONR/AuNP plasmonic structure. A relatively high dielectric constant and nanorod geometry of ZnO enabled the hybrid substrate to enhance trapping performance, compared with a control case fabricated using only gold nanoislands.

Dual-plasmonic Au/graphene/Au-enhanced ultrafast, broadband, self-driven silicon Schottky photodetector

High-performance photodetectors are desirable for various applications, including multi-wavelength image sensing, communication, and safety monitoring. In this study, we report the construction of a dual-surface plasmon-enhanced silicon Schottky photodetector using Au nanoparticles (NPs)/graphene/Au NPs hybrid structure as the electrode. It was found that the as-assembled device exhibited broad sensitivity, ranging from ultraviolet to near-infrared light (360–1330 nm) at room temperature, with a high response speed of 360 ns and a 3 dB bandwidth of 780 kHz at zero bias. Further theoretical simulation based on the finite-element method revealed that good device performance is associated with the contribution of the Au NPs/graphene/Au NPs electrode: intense dual-plasmonic resonance coupling is induced in a hybrid structure of two layers of metallic NPs separated by a uniform monolayer graphene. It not only can enhance light trapping and the localized electric field at the resonant and off-resonant wavelength regions, but is also beneficial for the tunneling of hot electrons. This work demonstrated the great potential of dual-plasmonic resonance coupling in optoelectronic devices and will lead to the development of advanced plasmonic devices.

Nanocarbon phase transformations controlled by solubility of carbon species in gold nanoparticles

The hybrid structures of carbon nanomaterials reveal the excellent properties and open new windows for the applications of carbon-based nanomaterials. However, the structural transformation of carbon nanomaterials should be better understood to design the new hybrid carbon nanomaterials. For this reason, we explore the growth of carbon nanorods composed of nanocrystalline graphite sheets and amorphous carbon nanoparticles by plasma enhanced hot filament chemical vapor deposition using Au film as the catalyst. The results indicate that the carbon nanorods are a hybrid structure of nanocrystalline graphite sheets and amorphous carbon nanoparticles formed via the large Au nanoparticles. The studies of transformation mechanism indicate that the solubility of C2 and C3 carbon species in the Au nanoparticles plays an important role in the conversion between graphite carbon and amorphous carbon. Moreover, the solubility of C, C2 and C3 carbon species in the Au nanoparticles can control the graphitic nanostructure and morphology. Furthermore, the study on the photoluminescence of carbon nanorods indicates the synthesized carbon nanorods emit the ultraviolet and green light at room temperature, which originates from the hydrocarbon radicals on the carbon nanorods and the transition between π* and π bands of sp2 carbon clusters in the carbon nanorods, respectively. The results enable us not only to control the structure of carbon nanomaterials but also develop the next-generation optoelectronic devices based on carbon nanomaterials.

Topotactic Transformation of Solvated MgCr-LDH Nanosheets to Highly Efficient Porous MgO/MgCr2O4 Nanocomposite for Photocatalytic H2 Evolution.

The hybrid structure of nanoparticles (NPs) with nanosheets has the advantage of both anisotropic properties of NPs and large specific surface areas of nanosheets, which is desirable for many technological applications. In this study, MgCr2O4 spinel NPs decorated on highly porous MgO nanosheets forming MgO/MgCr2 O4( x) nanocomposites were synthesized by a one pot coprecipitation method followed by a heat treatment process of the solvated wet gel of MgCr-LDH with polar solvent N, N-dimethylformamide (DMF) at 400 °C. This novel synthetic methodology generates materials consisting of porous metal oxides nanosheets adhered with spinel phase NPs due to the slow generation of gases such as H2O, CO2, and NH3 under moderate temperature during the heat treatment process. The synergistic effect of much wider band gap MgO nanosheets and narrow band gap MgCr2O4 NPs added increased stability due to the stronger bonding coordination of MgCr2O4 NPs with MgO nanosheets. The obtained MgO/MgCr2 O4( x) nanocomposites possess large specific surface areas, highly porous structure, and excellent interface between MgCr2O4 NPs and MgO nanosheets, which proved from N2 sorption isotherm, TEM, HR-TEM study. With metallic ratio of MgCr3:1, MgO/MgCr2O4(MgCr3:1) nanocomposites exhibit highest H2 evolution rate of 840 μmolg-12h-1, which was 2 times higher than that of pure MgCr2O4(420 μmolg-12h-1). The LSV measurement study of MgO/MgCr2O4 (MgCr3:1) nanocomposite shows an enhancement of light current density of 0.22 μA/cm2 at potential bias of -1.1 V. The Mott-Schottky analysis suggested the band edge positions of the n-type constituents and formation of n-n type heterojunctions in MgO/MgCr2O4 (MgCr3:1) nanocomposite, which facilitates the flow of charge carriers. The EIS and Bode phase plot of MgO/MgCr2O4 (MgCr3:1) nanocomposite signifies the lower interfacial charge transfer resistance and higher lifetime of electrons (2.7 ms) for enhanced H2 production. Lastly, the enhanced photocatalytic H2 production activity and long-term stability of MgO/MgCr2O4(MgCr3:1) could be attributed to maximum specific surface area, porous structure, close intimacy contact angle between two cubic phases of MgCr2O4 NPs and MgO nanosheets, abundant oxygen vacancies sites, reduced charge transfer resistance and suitable band edge potential to drive the thermodynamic energy for H2 production. This work highlighted an effective strategy for the synthesis of cost-effective 2D porous heterojunctions nanocomposite photocatalyst for promising applications in the field of clean H2 production utilizing abundant solar energy.