Phosphorus Defect Mediated Electron Redistribution to Boost Anion Exchange Membrane‐Based Alkaline Seawater Electrolysis

Advanced Energy Materials, Год журнала: 2024, Номер 14(31)

Опубликована: Май 20, 2024

Abstract It is of essential importance to design bifunctional electrocatalysts with excellent performance for both hydrogen evolution reaction (HER) and oxygen (OER) in seawater splitting. Herein, an approach manipulating electron redistribution NiCoP treated by P defect (P v ) engineering (NiCoP @NF) presented, exhibiting catalytic activities stability toward HER/OER alkaline solution. The reduces the surface electrooxidation reconfiguration energy barrier, making it easier drive local conversion crystals active oxy(hydroxide) OER. In addition, Ni site Co NiCoOOH are sites HER OER processes, respectively. situ generated PO 4 3− adsorbed on catalyst causes spatial repulsion, preventing Cl − corrosion electrolysis. AEM electrolyzer using @NF couple achieves high activity (2.43 V at 500 mA cm −2 long‐term durability (500 over 110 h). working efficiency 1.0 M KOH as 77.0% 100 price per GGE H 2 low $ 0.87.

Язык: Английский

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Efficient Conversion of Biomass to Formic Acid Coupled with Low Energy Consumption Hydrogen Production from Water Electrolysis

Angewandte Chemie International Edition, Год журнала: 2023, Номер 62(30)

Опубликована: Май 26, 2023

The development of a new electrolytic water hydrogen production coupling system is the key to realize efficient and low-cost promote its practical application. Herein, green electrocatalytic biomass formic acid (FA) coupled has been developed. In such system, carbohydrates as glucose are oxidized FA using polyoxometalates (POMs) redox anolyte, while H2 evolved continuously at cathode. Among them, yield high 62.5 %, only liquid product. Furthermore, requires 1.22 V drive current density 50 mA cm-2 , Faraday efficiency close 100 %. Its electrical consumption 2.9 kWh Nm-3 (H2 ), which 69 % that traditional water. This work opens up promising direction for with conversion.

Язык: Английский

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Hierarchical Interconnected NiMoN with Large Specific Surface Area and High Mechanical Strength for Efficient and Stable Alkaline Water/Seawater Hydrogen Evolution

Nano-Micro Letters, Год журнала: 2023, Номер 15(1)

Опубликована: Июнь 19, 2023

NiMo-based nanostructures are among the most active hydrogen evolution reaction (HER) catalysts under an alkaline environment due to their strong water dissociation ability. However, these vulnerable destructive effects of H2 production, especially at industry-standard current densities. Therefore, developing a strategy improve mechanical strength while maintaining or even further increasing activity nanocatalysts is great interest both research and industrial communities. Here, hierarchical interconnected NiMoN (HW-NiMoN-2h) with nanorod-nanowire morphology was synthesized based on rational combination hydrothermal bath processes. HW-NiMoN-2h found exhibit excellent HER accomodation abundant sites its morphology, in which nanowires connect free-standing nanorods, concurrently strengthening structural stability withstand production 1 A cm-2. Seawater attractive feedstock for electrolysis since generation desalination can be addressed simultaneously single process. The performance seawater suggests that presence Na+ ions interferes reation kinetics, thus lowering slightly. benefiting from characteristics, deliver outstanding cm-2 130 mV overpotential over 70 h M KOH seawater.

Язык: Английский

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Nanorod Array-Based Hierarchical NiO Microspheres as a Bifunctional Electrocatalyst for a Selective and Corrosion-Resistance Seawater Photo/Electrolysis System

ACS Catalysis, Год журнала: 2023, Номер 13(8), С. 5516 - 5528

Опубликована: Апрель 8, 2023

Utilizing earth-abundant seawater over scarce freshwater for hydrogen fuel production via water electrolysis is a promising/sustainable strategy. However, the serious anodic corrosion due to competing chloride oxidation reaction significantly hampers overall stability of electrolyzer. Therefore, it demands an efficient and robust catalyst with high selectivity resistance direct splitting. Here, we present bifunctional developed by morphology engineering form nanorod array-based hierarchical NiO microspheres (NRAHM-NiO) as three-dimensional (3D) oxide/hydroxide urchin-like structure material highly selective splitting against oxidation. Benefitting from intrinsic electroactive sites, good charge transferability, fast-releasing gas bubbles, well hydrophilic surface, NRAHM-NiO exhibits outstanding evolution (HER) oxygen (OER) catalytic activity toward durable The system requires small cell voltages 1.66 2.01 V drive current densities 100 500 mA cm–2 at room temperature, respectively. Such superior compared benchmark Pt/C(−)||Pt/C(+) Pt/C(−)||IrO2(+) pair systems. Importantly, this device demonstrates specific OER in 99% faradaic efficiency without forming any chlorine species. experimental results are supported density functional theory (DFT) calculations. Powered single solar cell, integrated photolysis shows 9.9% solar-to-hydrogen (STH) efficiency.

Язык: Английский

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Te-doped NiFe2O4 stabilized by amorphous carbon layers derived from one-step topological transitions of NiFe LDHs with significantly enhanced oxygen evolution reaction

Chemical Engineering Journal, Год журнала: 2023, Номер 464, С. 142604 - 142604

Опубликована: Март 25, 2023

Язык: Английский

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