Metal-organic framework (MOF)-based catalysts are gaining attention due to their tunable properties. In this study, we synthesized MOF based Ni and Co doped iron selenide (NiCoFeSe) hexagonal nanorods electrocatalyst. This NiCoFeSe catalyst exhibited outstanding performance in the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and urea oxidation reaction (UOR) with impressively low overpotentials of 220, 275 mV for HER, 230, 330 mV for OER, and 210, 300 mV for UOR at current densities of 50 and 100 mAcm−2, respectively. Additionally, we fabricate a wireless flexible and rigid photovoltaic-electrochemical device utilizing NiCoFeSe as both the anode and cathode, achieving an impressive solar-to-hydrogen efficiency of 11.1%. Furthermore, we developed an anion exchange membrane water electrolyzer with NiCoFeSe as anode and cathode, achieving a current density of 1.07 Acm−2 at 1.85 V, along with a cell efficiency of 69.67% and an energy consumption of 47.85 kWh to produce 1 kg of hydrogen. 

Efficient Green Hydrogen Production Through Metal–Organic Framework-Derived Ni and Co Mediated Iron Selenide hexagonal nanorods and Wireless coupled with Photovoltaics for Urea and Alkaline Water Electrolysis

In this work, a binder-free energy-storage electrode material of Ag nanoparticles coated nickel cobalt selenide (NiCoSe2) on Ni foam (NF) was first proposed. Wherein, NiCoSe2 was synthesized by one-step hydrothermal method using ascorbic acid as reductant, and the coating of Ag nanoparticles on NiCoSe2 were performed by magnetron sputtering method. The specific surface area was greatly increased due to the deposited Ag nanoparticles, and in this way the impedance of the electrode decreased, and the electrochemical properties were enhanced. When the magnetron sputtering time is 10 s, Ag/NiCoSe2 electrode exhibits the most excellent performances. However, further increase of sputtering time may result in the over cover on NiCoSe2, with great deterioration in electrochemical behavior. Single NiCoSe2 electrode possesses an area capacitance of 1600.7 mF cm−2 at a current density of 2 mA cm−2, while Ag/NiCoSe2 electrode could reach up to 2280 mF cm−2. The asymmetric supercapacitor (ASC) assembled by Ag/NiCoSe2 and activated carbon (AC) electrodes shows a high energy density of 0.171 mWh cm−2 as well as a power density of 17.340 mW cm−2, and the cyclic stability remains at 90.1% after 4000 cycles, which is superior to 83.7% of the NiCoSe2 single electrode. 

Enhanced performances of NiCoSe2 electrode coated with Ag nanoparticles by magnetron sputtering for the applications of asymmetric supercapacitors

Advancement in energy storage technologies is directly related to social development. As an advanced energy storage technology, supercapacitors (SCs) have gained significant attention owing to their exceptional performance in terms of energy density and power density. Electrodes are the most important components of a supercapacitor cell; thus, this review primarily deals with various types of transition metal-based electrodes. Specifically, bimetallic nickel and cobalt (NiCo)-chalcogenides and phosphides have received great attention due to their preeminent specific capacitance, tunable electronic structure, redox chemistry, presence of multiple oxidation states, and morphological tenability. However, applications of these materials in practical applications are hindered by their volumetric expansion during charge/discharge, low rate-capability, and low cyclic stability. This review highlights the advancement of three-dimensional (3D) NiCo-chalcogenides and phosphide electrodes over two-dimensional (2D) electrodes as the structure tends to improve electrocatalytic activity and stability in NiCo-based hybrid devices. Researchers have developed a number of modifications to obtain optimized, enhanced energy density and power density of these materials. In addition, advances on metal organic framework (MOF)-derived 3D architecture NiCo-chalcogenides and phosphide electrodes for SCs are discussed in detail, and their performances are also summarized. This report also outlines major challenges and some of the issues for increasing the performance of SCs, and future research perspectives are suggested. 

Comprehensive Review on Bimetallic (Ni and Co)-Chalcogenides and Phosphides with Three-Dimensional Architecture for Hybrid Supercapacitor Application

Abstract Thin‐films of metal‐organic frameworks (MOFs) have widespread potential applications, especially with the emergence of glass‐forming MOFs, which remove the inherent issue of grain boundaries and allow coherent amorphous films to be produced. Herein, it is established that atomic layer deposition (ALD) of zinc oxide lends excellent control over the thickness and localization of resultant polycrystalline and glass zeolitic imidazole framework‐62 (ZIF‐62) thin‐films within tubular α‐alumina supports. Through the reduction of the chamber pressure and dose times during zinc oxide deposition, the resultant ZIF‐62 films are reduced from 38 µm to 16 µm, while the presence of sporadic ZIF‐62 (previously forming as far as 280 µm into the support) is prevented. Furthermore, the glass transformation shows a secondary reduction in film thickness from 16 to 2 µm. 

Control of ZIF-62 and ag ZIF-62 Film Thickness within Asymmetric Tubular Supports through Pressure and Dose Time Variation of Atomic Layer Deposition.

Conjugated microporous polymers (CMPs) are a novel class of microporous materials highly regarded as exceptional building blocks for the fabrication of high-performance organic solvent nanofiltration membranes. However, preparing CMP thin films remains a challenge, primarily due to the formation of insoluble powders via traditional solvothermal synthesis. Here, we introduce the innovative oxidative molecular layer deposition (oMLD) method for the fabrication of robust CMP membranes utilizing 3,3′-bithiophene (33DT) monomers. The oMLD method enables the direct fabrication of CMP thin films on substrates of varying shapes and allows precise control over membrane structure and separation performance by simply altering the deposition cycles. Benefiting from the abundant micropores and highly cross-linked structure, the resulting CMP membranes facilitate rapid solvent transport and present size-dependent solute–solute separations. In applications involving high-value separations, the P33DT membrane proves effective for pharmaceutical separation in organic solvents. To the best of our knowledge, this work represents the pioneering instance of fabricating CMP membranes via oMLD, significantly broadening the available preparation methods and potential separation applications for CMP membranes. 

Precise Fabrication of Robust Conjugated Microporous Polymer Membranes via Oxidative Molecular Layer Deposition for Efficient Organic Solvent Nanofiltration

Electrode materials play an important role in determining the electrochemical performance of supercapacitors. As the negative electrode material for supercapacitors, Fe2O3 has been receiving a lot of attention. However, its low electrical conductivity and ion storage capacity have become urgent problems to be solved. In this paper, Fe2O3@FeSe2 heterostructures were prepared by a sequence of hydrothermal synthesis followed by template calcination. The SEM, XRD, TEM, and XPS characterizations show that the preparation of the heterostructure is successful. In addition, the electrode material exhibited 526.3 mF cm−2 in 1 M Na2SO4. Moreover, the retention rate was as high as 80.3 % after cycling for 4000 cycles at a high rate of 10 mA cm−2. Based on the first-principles calculations, it can be seen that the construction of the heterostructure effectively increases the total DOS of the electrode material and also generates a new built-in electric field. This facilitates the transfer of electrons, which results in the electrode material exhibiting good electrochemical properties. To further verify the practical application performance of the electrode material, it was matched and assembled with MnO2. The assembled hybrid supercapacitor has an operating voltage of 2.0 V and a specific capacitance of 155 mF cm−2. The energy density is up to 86 uWh cm−2 at a power density of 2 mWh cm−2. In addition, the device has good stability and shows good potential for application. 

Fe2O3@FeSe2 heterostructure as high-performance supercapacitor negative electrode material

ZIF-8-based electrodes with confined intercalation properties for sodium-ion supercapacitors

Preparation of High‐Performance BTO/PVDF Piezoelectric Pressure Sensors Based on Soybean Rhizobacteria Mimicry Using Electrostatic Spinning‐Thermal Pressing Method

Growing Magnetic NiCo-LDH Nanosheets on the Ni@CoSe2 Surface to Enhance Energy Storage Capacity in Asymmetric Supercapacitors

Regular nanoarrays are ideal structures for supercapacitors; however, they often require multiple operations during their preparation.

One-step electrodeposition preparation of NiCoSe2@carbon cloth as a flexible supercapacitor electrode material

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