Ruthenium single atoms implanted on NiS<sub>2</sub>-FeS<sub>2</sub> nanosheet heterostructures for efficacious water electrolysis

Ghising, Ram Babu; Pan, Uday Narayan; Kandel, Mani Ram; Dhakal, Purna Prasad; Sidra, Saleem; Kim, Do Hwan; Kim, Nam Hoon; Lee, Joong Hee

doi:10.1039/d3ta05630a

Cited by 10 publications

(3 citation statements)

References 58 publications

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“…Specifically, an ultralow overpotential of 10 mV is required to reach a current density of 10 mA cm –2 for FeCoP/NF, which is better than FeP/NF (35 mV), CoP/NF (97 mV), commercial Pt/C catalyst supported on Ni foam, pure Ni foam, and many other recently reported (non)noble metal-based HER electrocatalysts (Figure g and Table S1). − Besides, FeCoP/NF can deliver 100, 200, and 500 mA cm –2 at overpotentials of 57, 86, and 119 mV, respectively (Figure S10), which is better than FeP/NF (204, 305, and 467 mV) and CoP/NF (182, 227, and 331 mV).…”

Section: Resultsmentioning

confidence: 99%

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Wang,

Zhai,

Wang

et al. 2024

ACS Nano

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Water electrolysis assisted by hydrazine has emerged as a prospective energy conversion method for achieving efficient hydrogen generation. Due to the potential coincidence region (PCR) between the hydrogen evolution reaction (HER) and the electro-oxidation of hydrazine, the hydrazine oxidation reaction (HzOR) offers distinct advantages in terms of strategy amalgamation, device architecture, and the broadening of application horizons. Herein, we report a bifunctional electrocatalyst of interfacial heterogeneous Fe 2 P/ Co 2 P microspheres supported on Ni foam (FeCoP/NF). Benefiting from the strong interfacial coupling effect between Fe 2 P and Co 2 P and the three-dimensional microsphere structure, FeCoP/NF exhibits outstanding bifunctional electrocatalytic performance, achieving 10 mA cm −2 with low overpotentials of 10 and 203 mV for HER and HzOR, respectively. Utilizing FeCoP/NF for both electrodes in HzOR-assisted water electrolysis results in significantly reduced potentials of 820 mV for 1 A cm −2 in contrast to the electro-oxidation of alternative chemical substrates. The presence of a potential coincidence region makes the application of self-activated seawater electrolysis realistic. The gas production behavior at different current densities in this interesting hydrogen production system is discussed, and some rules that are distinguished from conventional water electrolysis are summarized. Furthermore, a new self-powered hydrogen production system with a direct hydrazine fuel cell, rechargeable Zn-hydrazine battery, and hydrazine-assisted seawater electrolysis is proposed, emphasizing the distinct benefits of HzOR and its potential role in electrochemical energy conversion technologies powered by renewable sources.

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Section: Resultsmentioning

confidence: 99%

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Wang,

Zhai,

Wang

et al. 2024

ACS Nano

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“…1−4 Among them, the OER is an anodic reaction of hydrogen production by water splitting. 5,6 Compared to the two-electron reaction of a simple hydrogen evolution reaction (HER) system, OER requires more energy to overcome the slow kinetics of the four-electron reaction. 7−10 Therefore, the OER is a rate-controlled reaction of overall water splitting.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrogen production from water splitting can achieve high purity, sustainable hydrogen production and zero carbon emissions and is considered to be one of the most promising hydrogen production technologies. − Among them, the OER is an anodic reaction of hydrogen production by water splitting. , Compared to the two-electron reaction of a simple hydrogen evolution reaction (HER) system, OER requires more energy to overcome the slow kinetics of the four-electron reaction. − Therefore, the OER is a rate-controlled reaction of overall water splitting. In general, expensive and scarce noble metals (such as RuO 2 ) are still considered to be the best electrocatalysts for OER. , Therefore, the development of low-cost, high-activity, and stable catalysts is essential to promoting the efficiency of water splitting.…”

Section: Introductionmentioning

confidence: 99%

Defect Engineering in Sn-Doped NiS/Ni₃S₂ Nanostructures for Oxygen Evolution Reaction

Li,

Feng,

Jiang

et al. 2024

ACS Appl. Nano Mater.

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Nickel-based sulfides have been proven to be excellent oxygen evolution reaction (OER) electrocatalysts due to their excellent electrical conductivity, but their poor stability hinders their application in practical applications. To address this issue, defect engineering has been proposed as a viable strategy to enhance the electronic structure of the catalyst and further boost the OER performance. Herein, a MOF-derived Sn-doped NiS/Ni 3 S 2 nanostructure grown in situ on nickel foam (Sn− Ni x S y /NF) has been designed as an active OER electrocatalyst. The morphology of the material was significantly impacted by the addition of the Sn elements, nanorods modified with nanoparticles providing more active sites. Moreover, the introduction of Sn elements induced the generation of sulfur vacancies (V s ), enhanced electron transfer, promoted electron redistribution, and increased the charge transfer rate. All of these endow the Sn−Ni x S y /NF-T with exceptionally low overpotentials of 104 and 286 mV to achieve a current density of 10 and 100 mA cm −2 for OER. Moreover, the Sn−Ni x S y /NF-T showed long-term stability, maintaining 100 h at current densities of 100 mA cm −2 . In short, this work opened a route for engineering defects to boost the OER.

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The Combination of Electronic Structure and Lattice Strain Engineering for Multi‐Powered Hydrazine‐Assisted Seawater Electrolysis System at High Current Densities

Wang,

Yan,

Wang

et al. 2024

Advanced Energy Materials

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The utilization of hydrazine in aiding water electrolysis presents a promising avenue for achieving highly efficient hydrogen production through energy conversion. Herein, bifunctional electrocatalyst of urchin‐like iron, nickle‐codoped cobalt phosphide supported on Ni foam (FeNi‐CoP/NF) is reported. Benefitting from the combined electronic structure and lattice strain engineering by Fe and Ni‐ codoping, the hydrazine‐assisted seawater electrolysis assembled with FeNi‐CoP/NF as both electrodes can achieve an industrial‐level current density of 1.5 A cm−2 at a record‐setting voltage of 163 mV at 70 °C and sustain stable operation for hundreds of hours in seawater environment. The existence of a potential coincidence region lends credibility to the feasibility of implementing self‐activated hydrazine‐assisted seawater electrolysis. Based on theoretical calculations, the separate and synergistic effects of electronic structure and lattice strain engineering are investigated and an integrated illustration of these two strategies on enhancing hydrogen evolution and hydrazine oxidation activity is provided. Moreover, an innovative multi‐powered hydrogen generation system featuring a direct hydrazine fuel cell, rechargeable Zn‐hydrazine battery, and hydrazine‐assisted seawater electrolysis is proposed, underscoring the unique advantages of hydrazine oxidation reaction and its prospective contribution to electrochemical energy conversion technologies powered by sustainable sources.

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Ruthenium single atoms implanted on NiS₂-FeS₂ nanosheet heterostructures for efficacious water electrolysis

Abstract: Ruthenium single atoms implanted on NiS2-FeS2 nanosheet heterostructures for efficacious water electrolysis.

Cited by 10 publications

References 58 publications

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Defect Engineering in Sn-Doped NiS/Ni₃S₂ Nanostructures for Oxygen Evolution Reaction

The Combination of Electronic Structure and Lattice Strain Engineering for Multi‐Powered Hydrazine‐Assisted Seawater Electrolysis System at High Current Densities

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Ruthenium single atoms implanted on NiS2-FeS2 nanosheet heterostructures for efficacious water electrolysis

Abstract: Ruthenium single atoms implanted on NiS2-FeS2 nanosheet heterostructures for efficacious water electrolysis.

Cited by 10 publications

References 58 publications

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Taking Advantage of Potential Coincidence Region: Insights into Gas Production Behavior in Advanced Self-Activated Hydrazine-Assisted Alkaline Seawater Electrolysis

Defect Engineering in Sn-Doped NiS/Ni3S2 Nanostructures for Oxygen Evolution Reaction

The Combination of Electronic Structure and Lattice Strain Engineering for Multi‐Powered Hydrazine‐Assisted Seawater Electrolysis System at High Current Densities

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Product

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Ruthenium single atoms implanted on NiS₂-FeS₂ nanosheet heterostructures for efficacious water electrolysis

Defect Engineering in Sn-Doped NiS/Ni₃S₂ Nanostructures for Oxygen Evolution Reaction