Hydroxide Nanosheets Research Articles

Electrochemical Determination of Hydrazine Based on Modified Screen-Printed Carbon Electrode

Abstract A new strategy for the electrochemical sensing of hydrazine based on Ni-Fe layered double hydroxide nanosheets modified screen-printed carbon electrode (Ni-Fe LDH NSs/SPCE) was studied. The techniques such as differential pulse voltammetry (DPV), cyclic voltammetry (CV), and chronoamperometry were utilized to evaluate the application of Ni-Fe LDH NSs modified SPCE for hydrazine determination. The results from CV exhibit that Ni-Fe LDH NSs/SPCE can significantly increase the oxidation peak current of hydrazine and also reduce the required over-potential. The quantitative determination of hydrazine was performed by DPV technique. This sensor showed a linear response to hydrazine in the concentration range of 0.05 to 670.0 µM. The limit of detection for hydrazine based on the modified SPCE was 0.02 µM. Furthermore, the Ni-Fe LDH NSs/SPCE platform presented satisfactory recoveries and reliabilities in river and well water samples, indicating the application potential of this developed electrochemical sensor for hydrazine determination in water samples.

Unveiling the performance of ultrathin bimetallic CoxNi1−x(OH)2 nanosheets for pseudocapacitors and oxygen evolution reaction

Bimetallic Co–Ni hydroxide nanosheets for pseudocapacitors and oxygen evolution reaction.

Enhanced oxygen evolution reaction performance of flower-like CoHS @NCDs through in-situ coupling of Nitrogen-Doped carbon dots and cobalt hydroxide nanosheets

Enhanced oxygen evolution reaction performance of flower-like CoHS @NCDs through in-situ coupling of Nitrogen-Doped carbon dots and cobalt hydroxide nanosheets

Directed Electron Modulation Stabilizes Iridium Oxide Clusters for High‐Current‐Density Oxygen Evolution

AbstractThe rapid advancement of the green hydrogen industry has driven a surge in demand for devices that operate over a broad range of current density. Despite this, the development of stable iridium‐based catalysts for high‐current‐density applications in oxygen evolution reactions remains a significant challenge. In this study, directed electron modulation (DEM) of iridium oxide clusters on cobalt hydroxide nanosheets is achieved using a cyclic Joule heating strategy in pure water. The strategy achieves a rapid change of environmental energy during electronic modulation through Joule heating, which ensures strong electronic coupling between IrO2 and Co(OH)2 without significant changes in initial catalyst nanostructure and cluster size. Directed electron modulation optimizes the reactant adsorption ability of the active center (IrO2 cluster) and corresponding reaction kinetics are improved, resulting in the catalyst (DEM‐IrO2@Co(OH)2‐NF) showing excellent performance. The DEM‐IrO2@Co(OH)2‐NF exhibits excellent catalytic activity in alkaline electrolytes with only 296 mV overpotential up to 1 A cm−2 and no significant degradation in 1000 h stability test at 1 A cm−2. Additionally, the anion exchange membrane electrolyzer using DEM‐IrO2@Co(OH)2‐NF||Pt/C requires only 1.68 V at 1 A cm−2 and remains stable for 200 h. This work will provide new directions for optimization of active centers.

Coupling Probiotics with CaO2 Nanoparticle-Loaded CoFeCe-LDH Nanosheets to Remodel the Tumor Microenvironment for Precise Chemodynamic Therapy.

Chemodynamic therapy (CDT) has become an emerging cancer treatment strategy with advantages of tumor-specificity, high selectivity, and low systemic toxicity. However, it usually suffers from low therapeutic efficacy. This is caused by low hydroxyl radical (·OH) yield arising because of the relatively high pH, overexpressed glutathione, and low H2O2 concentration in the tumor microenvironment (TME). Herein, a probiotic metabolism-initiated pH reduction and H2O2 supply-enhanced CDT strategy is reported to eradicate tumors by generating ·OH, in which Lactobacillus acidophilus is coupled with CoFeCe-layered double hydroxide nanosheets loaded with CaO2 nanoparticles (NPs) as a chemodynamic platform for high-efficiency CDT (CaO2/LDH@L. acidophilus). Owing to the hypoxia tropism of L. acidophilus, CaO2/LDH@L. acidophilus exhibits increased accumulation at tumor sites compared with the CaO2/LDH. The CaO2 NPs loaded on CoFeCe-LDH nanosheets are decomposed into H2O2 in the TME. L. acidophilus metabolite-induced pH reduction (<5.5) and CaO2-mediated in situ H2O2 generation synergistically boost ·OH generation activity of the CoFeCe-LDH nanosheets, effectively damaging cancer cells and ablating tumors with a tumor inhibition rate of 96.4%, 2.32-fold higher than that of CaO2/LDH. This work demonstrates that probiotics can function as a tumor-targeting platform to remodel the TME and amplify ROS generation for highly efficient and precise CDT.

Co-In Bimetallic Hydroxide Nanosheet Arrays With Coexisting Hydroxyl and Metal Vacancies Anchored on Rod-Like MOF Template for Enhanced Photocatalytic CO2 Reduction.

Layered double hydroxides (LDHs) can serves as catalysts for CO2 photocatalytic reduction (CO2PR). However, the conventionally synthesized LDHs undergo undesired aggregation, which results in an insufficient number of active sites and limits the desirable electron transfer required for CO2PR. The metal-organic framework (MOF) template-grown LDHs demonstrate excellent promise for exploiting the strengths of both MOFs and LDHs. Herein, the in situ growth of MIL-68(In)-NH2 MOF-templated Co-In bimetallic catalyst (CoIn-LDH/MOF) having an ultrathin nanosheet morphology on the preserved rod-like MOF template is demonstrated. Compared to the conventionally grown bimetallic LDH (CoIn-LDH), CoIn-LDH/MOF not only exposes more active sites but also possesses hydroxyl vacancies (VOH) and Co vacancies (VCo). Thus, CoIn-LDH/MOF performs a higher CO generation rate of 2320µmol g-1 h-1 during CO2PR, demonstrating improved activity and selectivity than those in CoIn-LDH. Experiments coupled with calculations reveal that the CoIn-LDH/MOF-driven CO2PR follows the *COOH pathway. The lower energy barriers for the formation of *COOH and CO(g) can be attributed to the coexistence of VOH and VCo in CoIn-LDH/MOF, effectively promoting charge transfer and enhancing CO2PR performance. This study provides a new strategy to obtain high-performant LDH-based catalysts with improved morphology.

Metal Doping Enabling Defective CoMo-Layered Double Hydroxide Nanosheets as Highly Efficient Photosensitizers for NIR-II Photodynamic Cancer Therapy.

Photodynamic therapy (PDT) is attracting widespread attention as a promising strategy for tumor treatment. However, the efficacy of PDT is severely limited by the insufficient tissue penetration depth of the light source and low reactive oxygen species (ROS) generation efficiency. Herein, the metal doping strategy is reported to construct a series of defect-rich M-doped amorphous CoMo-layered double hydroxide (a-M-CoMo-LDH, M = Mn, Cu, Al, Ni, Mg, Zn) photosensitizers (PSs) for NIR-II PDT. Especially, M-doped CoMo-LDH nanosheets are synthesized through a simple hydrothermal method and then etched by acid treatment to prepare defect-rich a-M-CoMo-LDH nanosheets. Under NIR-II 1270 nm laser irradiation, the defect-rich a-Zn-CoMo-LDH nanosheets exhibit the optimal PDT performance compared with other a-M-CoMo-LDH nanosheets, and also possess much higher ROS production activity (3.9 times) than that of the pristine a-CoMo-LDH, with a singlet oxygen quantum yield up to 1.86, which is the highest among all the reported PSs. After polyethylene glycol (PEG) modification, the a-Zn-CoMo-LDH-PEG nanosheets can function as an effective inorganic PS for PDT, effectively inducing cell apoptosis in vitro and eradicating tumors in vivo. Notably, transcriptome sequencing analysis and further molecular validation highlight the critical role of the apoptotic/p53/AMPK/oxidative phosphorylation signaling pathways in a-Zn-CoMo-LDH-PEG-induced cancer cell apoptosis.

PAD4 Inhibitor‐Loaded Layered Double Hydroxide Nanosheets as a Multifunctional Nanoplatform for Photodynamic Therapy‐Mediated Tumor Metastasis Treatment (Small 50/2024)

PAD4 Inhibitor‐Loaded Layered Double Hydroxide Nanosheets as a Multifunctional Nanoplatform for Photodynamic Therapy‐Mediated Tumor Metastasis Treatment (Small 50/2024)

Nickel-Cobalt Layered Double Hydroxide Nanosheet-Decorated 3D Interconnected Porous Ni/SiC Skeleton for Supercapacitor.

In this study, a three-dimensional (3D) interconnected porous Ni/SiC skeleton (3D Ni/SiC) was synthesized by binder-free hydrogen bubble template-assisted electrodeposition in an electrolyte containing Ni2+ ions and SiC nanopowders. This 3D Ni/SiC skeleton served as a substrate for directly synthesizing nickel-cobalt layered double hydroxide (LDH) nanosheets via electrodeposition, allowing the formation of a nickel-cobalt LDH nanosheet-decorated 3D Ni/SiC skeleton (NiCo@3D Ni/SiC). The multiscale hierarchical structure of NiCo@3D Ni/SiC was attributed to the synergistic interaction between the pseudocapacitor (3D Ni skeleton and Ni-Co LDH) and electrochemical double-layer capacitor (SiC nanopowders). It provided a large specific surface area to expose numerous active Ni and Co sites for Faradaic redox reactions, resulting in an enhanced pseudocapacitance. The as-fabricated NiCo@3D Ni/SiC structure demonstrated excellent rate capability with a high areal capacitance of 1565 mF cm-2 at a current density of 1 mA cm-2. Additionally, symmetrical supercapacitor devices based on this structure successfully powered commercial light-emitting diodes, indicating the potential of as-fabricated NiCo@3D Ni/SiC in practical energy storage applications.

Long-Cycling, Fast-Charging Lithium Metal Batteries Enabled by Nickel-Carbon Composite Nanosheet Arrays Modified Lithium Metal Anodes.

Lithium (Li) metal anode, one of the most promising candidates for next-generation rechargeable batteries, has always suffered from uneven Li deposition/stripping. To address this issue, this work designs a novel nickel-carbon composite modified Li metal anode (FNC-NF) by carbonizing fluoride nickel hydroxide nanosheet arrays grown on nickel foam (NF). These electrochemical tests present that the conductive and lithiophilic FNC can effectively restrain the growth of Li dendrites during the cycling of Li deposition/stripping at large capacities up to 10 mAh cm-2. This result is attributed to the featured FNC composition combining a core of nickel hydroxide and a mixed coating of defective carbon and Ni nanoparticles, and the unique hierarchical morphology of the FNC-NF integrating porous NF and vertically aligned FNC nanosheets. Consequently, the FNC-NF presents a stable coulombic efficiency performance after 900 cycles with an average of 99.23% for half cells, a lifespan over 3200 h for symmetric cells at 1 mA cm-2 and 1 mAh cm-2, and a remarkable cycling stability at large current densities of up to 15 mA cm-2 at 1 mAh cm-2. Moreover, the Li||FNC-NF||LiFePO4 full cells show superior capacity retention and cycling stability at 1 C.

Synergistic Interfaces of Pd Nanocrystals and Metal Hydroxides for Ethanol Oxidation Reaction

Introduction As one of the environmentally friendly power generation methods, alcohol fuel cells using bioalcohols have gained attention. Ethanol offers advantages such as low toxicity and an existing distribution network. However, its power generation efficiency is limited by the ethanol oxidation reaction (EOR) at the anode. In an alkaline environment, Pd-based catalysts are regarded as promising candidates due to high intrinsic catalytic activities. Thus, improving the catalytic activity of Pd-based catalysts is a challenging issue to meet the requirements of commercial applications. Several metal hydroxides achieved to improve catalytic activities of Pd nanoparticles for EOR, however, previous studies have not systematically investigated the effects of the kinds of metal hydroxide, structure of the contacting interface, and facets of the materials on catalytic activities of composite catalysts, lacking effective design guide of highly active electrocatalysts. In this study, we synthesize composite electrocatalysts of cubic and octahedral Pd nanoparticles (Pd-NPs) with well-defined facets and monolayer metal hydroxide nanosheets with containing Ni, Fe and Mn, and systematically elucidate highly active interfacial sites between Pd and metal hydroxides for EOR. Experimental The cubic and octahedral Pd (c-Pd, o-Pd) were synthesized by liquid phase synthesis using shape-controlling agents. The multi-metal hydroxide nanosheets were synthesized by exfoliating layered double hydroxides, resulting in FeNi hydroxide nanosheets (FeNi-NS) and MnNi hydroxide nanosheets (MnNi-NS). The suspensions of Pd-NPs and metal hydroxide nanosheets were mixed to synthesize the composite catalysts (Pd/NS). The samples were coated onto a glassy carbon rotating electrode and used as a working electrode. The ethanol oxidation reaction (EOR) was conducted using three electrodes system with a Hg/HgO reference electrode and a Pt wire counter electrode. The catalytic performances were evaluated by a cyclic voltammetry measurement in an Ar-saturated 1.0 mol dm-3 KOH aqueous solution containing 1.0 mol dm-3 ethanol. Results and Discussion SEM and TEM observations confirmed that c-Pd and o-Pd nanoparticles exposed (100) and (111) facets on their surfaces, respectively. Crystallographic diffraction peaks specific to these facets were observed in electron diffraction patterns. STEM observations of Pd/NS revealed that the faceted surface of Pd-NPs was modified with FeNi-NS and MnNi-NS (Fig. 1). The valence states of Pd in the composite catalysts changed to the oxidative states compared to that of the corresponding pristine Pd-NPs due to modification of nanosheets. All catalysts showed anodic peaks originated from ethanol oxidation in the rage of 0.5 and 0.9 V vs RHE. The composite catalysts showed higher current density than that of the pristine Pd-NPs, indicating that nanosheet modification enhanced the catalytic activities of Pd by change in valence states. The Pd/MnNi-NS composite catalysts showed higher activity than Pd/FeNi-NS composite catalysts. This suggests that higher hydroxide ion affinity of MnNi-NS facilitated the dehydrogenation reaction in EOR. While the c-Pd was superior for EOR than the o-Pd in the pristine Pd-NPs, the o-Pd/NS showed higher EOR performances than those of c-Pd/NS. The results suggest that the combination of metal hydroxides and the Pd (111) facet provides highly active interfacial sites for EOR.Fig. 1. The composite catalysts of FeNi-NS and (a)c-Pd and (b)o-Pd. Figure 1

Enhanced Mass Transportation for the Oxygen Evolution Reaction in Flexible Mesoporous Hydrogel Electrodes

Water electrolysis is of great importance for the hydrogen production from renewable energy. The efficiency of water electrolysis depends highly on the performance of anodes because of the high overpotential of the oxygen evolution reaction (OER). Mesoporous electrodes with high surface area and relatively small pore size (2-50 nm) have attracted much attention as highly active OER electrodes; however, the mass transportation of generated oxygen molecules and hydroxide ions in mesopores often limit the OER current density.In this study, we propose a novel class of materials, namely flexible mesoporous hydrogel electrodes which consist of assemblies of CoOOH nanosheets. Flexible mesoporous hydrogel electrodes were prepared by electrochemical deposition of cobalt hydroxide nanosheets modified with tris(hydroxymethyl)aminomethane (depicted as Co-ns [1]) on nickel substrates. Co-ns formed a house-of-cards assembly, having characteristics of hydrogels, during the deposition process. The surface modifying group of Co-ns was anodically decomposed and Co-ns was transformed into CoOOH nanosheets. Because of the weak connections among CoOOH nanosheets the resultant assemblies provided flexible mesoporous frameworks.The flexible mesoporous electrodes with different thicknesses (4-37 μm) were prepared, changing the deposition time. The porosity of the flexible mesoporous electrodes were estimated to be approximately 97% because of the very thin thickness of the CoOOH nanosheets. Rigid mesoporous electrodes with Co3O4 frameworks with different thicknesses (11-60 μm) were also prepared by dip-coating method, using Pluronic F127 as a template. The porosity of the rigid mesoporous electrodes was approximately 78%. The electrochemical tests were performed in a three electrode cell at 30 ºC.The OER polarization curves of the flexible mesoporous electrodes and the rigid mesoporous electrodes in 1.0 M KOH electrolyte are shown in the Figure 1. The OER current densities of the rigid mesoporous electrodes depend quantitatively on the thickness of the films at 1.50 V vs. RHE, though the current densities became independent of the thickness of the films at 1.60 V vs. RHE. On the other hand, the OER current densities of the flexible mesoporous electrodes depend quantitatively on the thickness of the films at wide potential region, even at 1.60 V vs. RHE, indicating that the high mass transport ability of generated oxygen molecules and hydroxide ions in the mesopores.In conventional rigid mesoporous electrodes, oxygen bubbles should form within mesopores with defects, i.e. large nanospace and cracks, and the generated bubbles plug the mass transport paths. The flexible mesoporous hydrogel electrodes are expected to have defect-less mesoporous structures because they can change the mesoporous structures flexibly to reduce defects, and defects can be self-healed once they are formed. It is also expected that the flexible frameworks change their mesoporous structure to optimize the mass transportation path during OER.In conclusion, novel mesoporous hydrogel electrodes were prepared for the first time by the electrochemical deposition of Co-ns. The flexible mesoporous hydrogel electrodes exhibited high OER performance, depending on the thickness of the films quantitatively at high current density region. Flexible mesoporous hydrogel electrodes are promising as novel types of electrodes to improve the efficiency of water electrolysis. This work was supported by the JSPS KAKENHI (grant number 24K01580).

Preparation and electrochemical performance of PPyNTs/NiCo-LDH for asymmetric supercapacitors

Supercapacitors possess remarkable benefits in terms of electrochemical energy storage, whereas the inherent defects, such as suboptimal power density, limit commercial employment. Here, NiCo double hydroxide (NiCo-LDH) nanosheets with ZIF-67 as the precursor were fabricated and anchored on the surface of polypyrrole nanotubes (PPyNTs) to prepare composite electrode materials (PPyNTs/NiCo-LDH). Electrochemical test results show that the electrode material possesses 1802 F g−1 specific capacitance under a 1 A g-1 current density. Furthermore, it shows a retention of 50.2 % for capacitance after 5000 cycles with 10 A g-1 current density. To examine the practical performance of the materials, aqueous asymmetric supercapacitors PPyNTs/NiCo-LDH//AC were assembled, with up to 115 F g−1 specific capacitance at 1 A g-1 under a stabilized output voltage of 1.5 V, and possessing a high energy density of 35.94 Wh kg−1 at a power density of 760.2 W kg−1. Meanwhile, the capacitance retention of 65.3 % after 5000 cycles.

FeCo Bimetallic ZIF Derivatives Decorated with CoFe-LDH to Promote Bifunctional Oxygen Electrocatalysis Activation.

Reasonably screening the targeted oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) constituents and constructing high-efficiency and stabilized ORR/OER bifunctional electrocatalysts are pivotal for the advancement of rechargeable zinc-air batteries (ZABs). Here, CoFe layered double hydroxide (CoFe-LDH) nanosheets are deposited on nitrogen-doped graphite-carbon polyhedra with FeCo alloy nanoparticles (FeCo/LDH-NGCP). Due to the synergic effect between FeCo-NGCP, CoFe-LDH and FeCo/LDH-NGCP, the electrocatalyst with the abundant and accessible active sites can provide good charge/mass transfer, and thus shows wonderful ORR and OER bifunctional electrocatalytic performance. In ORR tests, FeCo/LDH-NGCP catalyst displays larger half-wave potential (E1/2, 0.89 V vs. 0.85 V), higher limiting current density (JL, 5.91 mA/cm2 vs. 5.14 mA/cm2) and better stability than commercial Pt/C. As for OER, FeCo/LDH-NGCP possesses a smaller overpotential (η) of 299.6 mV at a current density of 10 mA/cm2 and more durable stability than commercial RuO2 (330.6 mV). Furthermore, in ZAB tests, the cycling stability of ZAB-FeCo/LDH-NGCP (over 470 h) outperforms the ZAB-Pt/C+RuO2 (92 h) with commercial electrocatalyst (Pt/C+RuO2). Therefore, the FeCo/LDH-NGCP catalyst offers a new perspective to construct ZABs bifunctional catalysts and their commercial application in ZABs.

Aqueous exfoliated 2D cobalt-iron-layered double hydroxide nanosheets: Effect of Co:Fe ratio on electrocatalytic oxygen evolution reaction

The water exfoliation strategy is utilized to synthesize ultrathin monolayers of 2-dimensional cobalt-iron-layered double hydroxide nanosheets (CFL-NS) for application in the electrocatalytic oxygen evolution reaction (OER). These nanosheets exhibit a hexagonal crystal structure, and their zeta potential varies between +30 mV and +36 mV, depending on the Co:Fe ratio. The electron microscopy analysis reveals aggregated ultrathin nanosheets with a lateral size of ∼75 nm and the formation of very small nanoparticles due to the tearing of CFL-NS. The bulk CFL and CFL-NS with Co:Fe ratio of 3:1 demonstrate outstanding OER performance, with an overpotential of 305 and 299 mV at a current density of 10 and 25 mA cm−2, respectively. Additionally, they exhibit a high electrochemical active surface area (ECSA) of 8.5 cm2, a Tafel slope of 47 mV dec−1, and excellent electrocatalytic stability during a chronoamperometric test of 24 h. This study underscores the benefits of an aqueous LDH exfoliation strategy for achieving enhanced electrocatalytic performance of CFL-NS.

TiO2 nanorod arrays modified by NiFe-layered double hydroxide nanosheets for boosting photoelectrochemical water splitting

TiO2 nanorod arrays modified by NiFe-layered double hydroxide nanosheets for boosting photoelectrochemical water splitting

Trimetallic FeNiCo layered double hydroxide catalysts for industrial-level electrochemical glycerol upgrading

Electrocatalytic conversion of glycerol, a byproduct of biodiesel production, into high value-added chemicals presents a transformative approach for biomass valorization. However, developing stable catalysts that consistently achieve industrial-grade current density at low potentials remains challenging. Herein, a highly efficient FeNiCo-Co(OH)2 electrocatalyst for the glycerol oxidation, by leveraging interconnected FeNiCo layered double hydroxide (LDH) nanosheets grown on a Co(OH)2 precursor is developed. This catalyst achieves an impressive current density of 1000 mA cm−2 at a low voltage of 1.38 V, exhibiting remarkable selectivity for formate and glycollate production. This superior performance stems from the optimized electronic structure and synergistic interactions within the FeNiCo LDHs, enabling the formation of high-valent species at lower potentials, efficient handling reaction intermediates, reduced charge transfer resistance, upward d band center and optimized mass transport, thereby enhancing glycerol adsorption and oxidation. Notably, the electrode exhibits stable operation at 120 mA cm−2 for 32 h and yields 227.50 and 104.17 mmol cm−2 for formate and glycollate, respectively, at industrial current densities for 8 h. This study unveils a novel transition metal-based glycerol oxidation reaction electrocatalyst and lays a foundation for its industrial application, highlighting significant advancements in biomass valorization.

Novel large-scale integrated non-precious metal electrodes for efficient and stable oxygen evolution reaction at high current density in 2.5 kW anion exchange membrane water electrolysis

The utilization of non-precious catalysts to substitute precious metal catalysts on anode side under high current density conditions and with long-term resistance is crucial for the implementation of alkaline anion-exchange membrane water electrolysis (AEMWE) applications. To accommodate industrial applications, a combination of chemical solution and electrodeposition was used to construct NiFeCo layered double hydroxide and NiS nanosheet heterostructures on Ni foam (NiFeCo LDH/NiS/NF). Both experiments and theoretical calculations show that the heterogeneous structure reduces the activation energy barrier of the catalytic reaction and provides an appropriate electronic structure. This not only guarantees the exposure of the active site but also adjusts the local coordination environment and chemisorption properties. Consequently, the reduction in energy barrier affects the rate-determining step (RDS) from *O to *OOH, as well as the energy barriers of all four steps in the oxygen evolution reaction (OER). Consequently, the optimized NiFeCo LDH/NiS/NF catalyst demonstrates a low voltage of 288 mV to operate 1.0 A cm−2. Additionally, the catalyst was conducted with commercial Pt/C coated onto carbon paper (Pt/C/CP) for 2 × 2 cm2 AEMWE exhibited 1.63 V cell voltage to attain 1 A cm−2 and operated for 2100 h from 1 A cm−2 to 2.5 A cm−2 (1.69 V to 1.92 V). Further, the catalyst was prepared scalable to 15 × 15 cm2 for application into a 2.5 kW AEMWE device, which required only 1.77 V at 60 °C to catch 1 A cm−2 for 1000 h, which shows extremally promising application for stable AEMWE device.

Nickel coated paper electrode constructed by interfacial electrodeposition for biomass upgrading at industrial current density

Substituting the kinetically slow oxygen evolution reaction (OER) with biomass electrooxidation significantly decreases the energy demand of water electrolysis. However, exploring and optimizing efficient electrocatalysts remains a challenge for large−scale production of valuable chemicals and hydrogen. Herein, we have constructed a nickel coated paper electrode (NiCo@Ni/CP) composed of crystalline Ni metal and amorphous NiCo hydroxide nanosheets layers via interfacial electrodeposition on carbon paper (CP) for monosaccharide oxidation reactions (MOR), which achieved a formate yield of 82.4 %. Remarkably, the flow electrolyzer maintained an industrial−grade current density of 1 A cm−2 at 1.70 V with exceptional stability over 100 h, also displaying significant co−generation Faradaic efficiencies of approximately 80.0 % and 97.3 % for formate and hydrogen production, respectively. The superior performance is attributed to the redistribution of electrons at the Ni and amorphous NiCo hydroxide interface, which enhances charge transfer and reactant adsorption by adjusting the d−band center, hence reducing deprotonation and C−C bond cleavage energies of xylose during MOR. This work provides a promising strategy for the design of efficient catalysts for biomass upgrading and the production of hydrogen at high current densities.

Res@LDH: A Novel Nanohybrid Therapeutic for Ischemia-Reperfusion Injury with Dual Reactive Oxygen Species Scavenging Efficiency.

Ischemic stroke poses a global health challenge, necessitating effective therapeutic interventions given the limited time window for thrombolytic therapy. Here, we present Res@LDH, a novel nanohybrid therapeutic agent boasting a dual reactive oxygen species scavenging efficiency of approximately 90%. Comprising Ge-containing layered double hydroxide nanosheets (Ge-LDH) as a drug nanocarrier and resveratrol as a neuroprotective agent, Res@LDH demonstrates enhanced permeability across the blood-brain barrier, ensuring high biocompatibility and stability. We explored the potential of Res@LDH in mitigating oxidative stress injury induced by middle cerebral artery occlusion and reperfusion in mice, as well as H2O2-induced cytotoxicity in HT22 cells. Our experiments unveil Res@LDH's capacity to ameliorate neurological deficits, reduce the infarction volume, mitigate blood-brain barrier disruption, exhibit a robust antioxidant activity, and dampen the release of proinflammatory cytokines. Moreover, Res@LDH treatment markedly attenuates microglial and astrocytic activation. Leveraging a pioneering synthetic approach harnessing Ge-LDH and resveratrol, Res@LDH emerges as a promising strategy for addressing ischemia-reperfusion injury, offering a concise solution to current therapeutic challenges.