Phosphorus‐Modified Amorphous High‐Entropy CoFeNiCrMn Compound as High‐Performance Electrocatalyst for Hydrazine‐Assisted Water Electrolysis

Small, Journal Year: 2023, Volume and Issue: 19(42)

Published: June 22, 2023

Exploiting highly active and bifunctional catalysts for both hydrogen evolution reaction (HER) hydrazine oxidation (HzOR) is a prerequisite the acquisition. High-entropy materials have received widespread attention in catalysis, but high-performance electrodes are still lacking. Herein, novel P-modified amorphous high-entropy CoFeNiCrMn compound developed on nickel foam (NF) by one-step electrodeposition strategy. The achieved CoFeNiCrMnP/NF delivers remarkable HER HzOR performance, where overpotentials as low 51 268 mV realized at 100 mA cm-2 . improved cell voltage of 91 further demonstrated assessing constructed hydrazine-assisted water electrolyser, which almost 1.54 V lower than HER||OER system. Experimental results confirm important role each element regulating bifuncational performance catalysts. main influencing elements seem to be Fe Ni HER, while P-modification Cr metal may contribute lot HzOR. These synergistic advantages help energy barriers improve kinetics, resulting excellent activity CoFeNiCrMnP/NF. work offers feasible strategy develop self-supporting electrode with overall splitting.

Language: Английский

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The self-reconstruction of Co-modified bimetallic hydroxysulfide nanosheet arrays for efficient hydrazine assisted water splitting

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 49, P. 489 - 497

Published: Aug. 23, 2023

Language: Английский

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Anion-modulated CoP electrode as bifunctional electrocatalyst for anion-exchange membrane hydrazine-assisted water electrolyser

Materials Horizons, Journal Year: 2023, Volume and Issue: 10(11), P. 5277 - 5287

Published: Jan. 1, 2023

The hydrazine oxidation reaction (HzOR) is considered as a promising alternative process of the oxygen evolution (OER) to realize more energy-efficient hydrogen generation. However, lack highly active bifunctional catalysts poses huge challenge this strategy. In work, we report novel and universal electrodeposition strategy rationally synthesize self-supporting electrode. utilization ammonium fluoride helps modulate not only morphology CoP, but also synchronous formation an anion-modified structure, leading excellent performance. optimal F-CoP/CF exhibits small potentials -90 mV 41 at 1 A cm-2, high stability low Tafel slopes 28 dec-1 3.26 for HER HzOR, respectively. efficient stable activity can be further confirmed in anion-exchange membrane hydrazine-assisted water electrolyzer (0.49 V cm-2). Utilizing density functional theory calculations, optimized adsorption energy molecules intermediates well rate-determining step HzOR are demonstrated F-CoP.

Language: Английский

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Microenvironment regulation strategies of single-atom catalysts for advanced electrocatalytic CO2 reduction to CO

Nano Energy, Journal Year: 2023, Volume and Issue: 118, P. 108967 - 108967

Published: Oct. 10, 2023

Language: Английский

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Interface Engineering of a Hierarchical P-Modified Co/Ni₃P Heterostructure for Highly Efficient Water Electrolysis Coupled with Hydrazine Degradation

ACS Sustainable Chemistry & Engineering, Journal Year: 2023, Volume and Issue: 11(38), P. 14186 - 14196

Published: Sept. 12, 2023

Energy-saving water electrolysis is an ideal strategy to realize the grid-scale generation of hydrogen fuel, especially by coupling with alternating hydrazine oxidation reaction (HzOR). However, lack self-supporting electrodes excellent bifunctional performance key problem high operating voltages. Herein, a unique electrodeposition first developed design (P–Co/Ni3P)A3/NF (NF = nickel foam) electrode, which has hierarchical heterostructure for more active sites and robust interface interactions, resulting in activity. The electrode exhibits small potentials −10 −79 mV at 10 mA cm–2 as well low Tafel slopes 45 1.8 dec–1 evolution (HER) HzOR, respectively. Inspiringly, extremely small-cell voltage 50 required current density 300 two-electrode device, 1.77 V lower than that overall splitting (1.82 V) system. Density functional theory calculations confirm construction P–Co/Ni3P achieves improvement calculated adsorption energy H2O molecule (ΔGH2O), ΔGH*, dehydrogenation kinetics intermediates, thereby accelerating electrocatalytic activity HER/HzOR. Our suggests possibility development other material synthesis optimization production.

Language: Английский

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Realizing highly-efficient urea oxidation via decreasing the energy barrier of deprotonation over regulated electronic structure of Co doped Ni(OH)2

Applied Surface Science, Journal Year: 2023, Volume and Issue: 640, P. 158391 - 158391

Published: Sept. 7, 2023

Language: Английский

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Hierarchical Cobalt–Nickel Phosphide/Molybdenum Disulfide Hybrid Electrocatalyst Triggering Efficient Hydrogen Generation in a Wider pH Range

ACS Applied Energy Materials, Journal Year: 2023, Volume and Issue: 6(18), P. 9577 - 9584

Published: Sept. 11, 2023

Structural engineering of the molybdenum disulfide (MoS2) retains its importance for application hydrogen evolution reaction (HER) in a full pH range. However, catalytic performance reported MoS2-based materials, especially neutral conditions, is unsatisfactory. Herein, an effective synergy between CoP, Ni2P, and MoS2 nanosheets established via simple strategy, which constructs self-supporting (CoP/Ni2P/MoS2–CC) electrode endowed with abundant active sites, optimal electronic structure, improved charge transfer capability. The optimized CoP/Ni2P/MoS2–CC sample shows low overpotentials 335, 119, 211 mV at 100 mA cm–2 neutral, alkaline, acidic electrolytes small Tafel slopes 63, 62, 82 dec–1, respectively. Remarkably, medium superior to that most hybrid electrocatalysts. Our work proves facile feasible strategy promote pH-universal activities heterogeneous structures production.

Language: Английский

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Rational design of tungsten-doped cobalt molybdate nanosheet arrays for highly active ethanol-assisted hydrogen production

International Journal of Hydrogen Energy, Journal Year: 2023, Volume and Issue: 48(88), P. 34244 - 34254

Published: June 7, 2023

Language: Английский

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Electronic structural engineering of bimetallic Bi-Cu alloying nanosheet for highly-efficient CO2 electroreduction and Zn-CO2 batteries

Nano Research, Journal Year: 2023, Volume and Issue: unknown

Published: Nov. 24, 2023

Language: Английский

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Modulation of charge structure in Bi/Bi2O3-In2O3@C for efficient CO2 electroreduction to formate

Journal of Colloid and Interface Science, Journal Year: 2024, Volume and Issue: 678, P. 913 - 923

Published: Sept. 23, 2024

Language: Английский

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