Defect‐Rich Heterogeneous MoS₂/NiS₂ Nanosheets Electrocatalysts for Efficient Overall Water Splitting

Advanced Science, Journal Year: 2019, Volume and Issue: 6(14)

Published: May 20, 2019

Abstract Designing and constructing bifunctional electrocatalysts is vital for water splitting. Particularly, the rational interface engineering can effectively modify active sites promote electronic transfer, leading to improved splitting efficiency. Herein, free‐standing defect‐rich heterogeneous MoS 2 /NiS nanosheets overall are designed. The abundant interfaces in not only provide rich electroactive but also facilitate electron which further cooperate synergistically toward electrocatalytic reactions. Consequently, optimal show enhanced performances as This study may open up a new route rationally maximize their electrochemical performances, help accelerate development of nonprecious

Language: Английский

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Ultrahigh-Loading of Ir Single Atoms on NiO Matrix to Dramatically Enhance Oxygen Evolution Reaction

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(16), P. 7425 - 7433

Published: March 15, 2020

Engineering single-atom electrocatalysts with high-loading amount holds great promise in energy conversion and storage application. Herein, we report a facile economical approach to achieve an unprecedented high loading of single Ir atoms, up ∼18wt%, on the nickel oxide (NiO) matrix as electrocatalyst for oxygen evolution reaction (OER). It exhibits overpotential 215 mV at 10 mA cm-2 remarkable OER current density alkaline electrolyte, surpassing NiO IrO2 by 57 times 46 1.49 V vs RHE, respectively. Systematic characterizations, including X-ray absorption spectroscopy aberration-corrected Z-contrast imaging, demonstrate that atoms are atomically dispersed outermost surface stabilized covalent Ir-O bonding, which induces isolated form favorable ∼4+ oxidation state. Density functional theory calculations reveal substituted atom not only serves active site but also activates reactivity NiO, thus leads dramatically improved performance. This synthesis method developing catalysts can be extended other paves way industrial applications catalysts.

Language: Английский

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Engineering active sites on hierarchical transition bimetal oxides/sulfides heterostructure array enabling robust overall water splitting

Nature Communications, Journal Year: 2020, Volume and Issue: 11(1)

Published: Oct. 29, 2020

Rational design of the catalysts is impressive for sustainable energy conversion. However, there a grand challenge to engineer active sites at interface. Herein, hierarchical transition bimetal oxides/sulfides heterostructure arrays interacting two-dimensional MoOx/MoS2 nanosheets attached one-dimensional NiOx/Ni3S2 nanorods were fabricated by oxidation/hydrogenation-induced surface reconfiguration strategy. The NiMoOx/NiMoS array exhibits overpotentials 38 mV hydrogen evolution and 186 oxygen 10 mA cm-2, even surviving large current density 500 cm-2 with long-term stability. Due optimized adsorption energies accelerated water splitting kinetics theory calculations, assembled two-electrode cell delivers industrially relevant densities 1000 record low voltages 1.60 1.66 V excellent durability. This research provides promising avenue enhance electrocatalytic performance engineering interfacial toward large-scale splitting.

Language: Английский

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Interface Engineering of Hierarchical Branched Mo‐Doped Ni₃S₂/Ni_xP_y Hollow Heterostructure Nanorods for Efficient Overall Water Splitting

Advanced Energy Materials, Journal Year: 2020, Volume and Issue: 10(17)

Published: March 16, 2020

Abstract Rational design and construction of bifunctional electrocatalysts with excellent activity durability is imperative for water splitting. Herein, a novel top‐down strategy to realize hierarchical branched Mo‐doped sulfide/phosphide heterostructure (Mo‐Ni 3 S 2 /Ni x P y hollow nanorods), by partially phosphating Mo‐Ni /NF flower clusters, proposed. Benefitting from the optimized electronic structure configuration, nanorod structure, abundant heterogeneous interfaces, as‐obtained multisite electrode has remarkable stability electrocatalytic in hydrogen evolution reaction (HER)/oxygen (OER) 1 m KOH solutions. It possesses an extremely low overpotential 238 mV at current density 50 mA cm −2 OER. Importantly, when assembled as anode cathode simultaneously, it merely requires ultralow cell voltage 1.46 V achieve 10 , over 72 h, outperforming most reported Ni‐based materials. Density functional theory results further confirm that doped can synergistically optimize Gibbs free energies H O‐containing intermediates (OH*, O*, OOH*) during HER OER processes, thus accelerating catalytic kinetics electrochemical This work demonstrates importance rational combination metal doping interface engineering advanced

Language: Английский

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2D Transition Metal Dichalcogenides: Design, Modulation, and Challenges in Electrocatalysis

Advanced Materials, Journal Year: 2020, Volume and Issue: 33(6)

Published: June 24, 2020

Hydrogen has been deemed as an ideal substitute fuel to fossil energy because of its renewability and the highest density among all chemical fuels. One most economical, ecofriendly, high-performance ways hydrogen production is electrochemical water splitting. Recently, 2D transition metal dichalcogenides (also known TMDs) showed their utilization potentiality cost-effective evolution reaction (HER) catalysts in electrolysis. Herein, recent representative research efforts systematic progress made TMDs are reviewed, future opportunities challenges discussed. Furthermore, general methods synthesizing materials introduced detail advantages disadvantages for some specific provided. This explanation includes several important regulation strategies creating more active sites, heteroatoms doping, phase engineering, construction heterostructures, synergistic modulation which capable optimizing electrical conductivity, exposure catalytic barrier electrode material boost HER kinetics. In last section, current obstacles chances development electrocatalysts proposed provide insight into valuable guidelines fabricating effective electrocatalysts.

Language: Английский

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Water Splitting: From Electrode to Green Energy System

Nano-Micro Letters, Journal Year: 2020, Volume and Issue: 12(1)

Published: June 17, 2020

Abstract Hydrogen (H 2 ) production is a latent feasibility of renewable clean energy. The industrial H obtained from reforming natural gas, which consumes large amount nonrenewable energy and simultaneously produces greenhouse gas carbon dioxide. Electrochemical water splitting promising approach for the production, sustainable pollution-free. Therefore, developing efficient economic technologies electrochemical has been an important goal researchers around world. utilization green systems to reduce overall consumption more production. Harvesting converting environment by different can efficiently decrease external power consumption. A variety producing , such as two-electrode electrolysis water, driven photoelectrode devices, solar cells, thermoelectric triboelectric nanogenerator, pyroelectric device or water–gas shift device, have developed recently. In this review, some notable progress made in cells discussed detail. We hoped review guide people pay attention development system generate pollution-free energy, will realize whole process with low cost, sustainability conversion.

Language: Английский

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Recent advances in transition-metal-sulfide-based bifunctional electrocatalysts for overall water splitting

Journal of Materials Chemistry A, Journal Year: 2021, Volume and Issue: 9(9), P. 5320 - 5363

Published: Jan. 1, 2021

This review summarizes recent advances relating to transition metal sulfide (TMS)-based bifunctional electrocatalysts, providing guidelines for the design and fabrication of TMS-based catalysts practical application in water electrolysis.

Language: Английский

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Atomic heterointerface engineering overcomes the activity limitation of electrocatalysts and promises highly-efficient alkaline water splitting

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(10), P. 5228 - 5259

Published: Jan. 1, 2021

This review summarizes the recent progress of atomic heterointerface engineering to overcome activity limitation electrocatalysts for water splitting and elaborates its electron effect ensemble effect, etc.

Language: Английский

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Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Chemical Reviews, Journal Year: 2024, Volume and Issue: 124(7), P. 3694 - 3812

Published: March 22, 2024

Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts the two half-reactions of (e.g., and oxygen evolution reactions, HER OER) separately, there growing interest designing bifunctional electrocatalysts, which are able to catalyze both OER. In addition, considering high overpotentials required OER while limited value produced oxygen, is another rapidly exploring alternative oxidation reactions replace hybrid toward energy-efficient generation. This Review begins with an introduction on fundamental aspects splitting, followed thorough discussion various physicochemical characterization techniques that frequently employed probing active sites, emphasis reconstruction during redox electrolysis. The design, synthesis, performance diverse based noble metals, nonprecious metal-free nanocarbons, overall acidic alkaline electrolytes, thoroughly summarized compared. Next, their application also presented, wherein anodic include sacrificing agents oxidation, pollutants oxidative degradation, organics upgrading. Finally, concise statement current challenges future opportunities presented hope guiding endeavors quest sustainable

Language: Английский

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Activating and optimizing the activity of NiCoP nanosheets for electrocatalytic alkaline water splitting through the V doping effect enhanced by P vacancies

Journal of Materials Chemistry A, Journal Year: 2019, Volume and Issue: 7(42), P. 24486 - 24492

Published: Jan. 1, 2019

We design V doped NiCoP nanosheets with P vacancies induced by Ar plasma as a cost-effective and bifunctional electrocatalyst for overall water splitting.

Language: Английский

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