In Situ Raman Study of Surface Reconstruction of FeOOH/Ni3S2 Oxygen Evolution Reaction Electrocatalysts DOI
Mengxin Chen, Yuanyuan Zhang, Ji Chen

et al.

Small, Journal Year: 2024, Volume and Issue: 20(23)

Published: Jan. 2, 2024

Abstract Construction of heterojunctions is an effective strategy to enhanced electrocatalytic oxygen evolution reaction (OER), but the structural active phases and synergistic mechanism still lack in‐depth understanding. Here, FeOOH/Ni 3 S 2 heterostructure supported on nickel foam (NF) through a two‐step hydrothermal‐chemical etching method reported. In situ Raman spectroscopy study surface reconstruction behaviors /NF indicates that Ni can be rapidly converted NiOOH, accompanied by phase transition from α ‐FeOOH β during OER process. Importantly, deep analysis Ni─O bond reveals FeOOH regulate lattice disorder NiOOH for improved catalytic activity. Density functional theory (DFT) calculations further confirm NiOOH/FeOOH possess strengthened adsorption O‐containing intermediates, as well lower energy barrier toward OER. As result, exhibits promising activity stability in alkaline conditions, requiring overpotential 268 mV @ 100 mA cm −2 long‐term over 200 h at current density . This work provides new perspective understanding heterogeneous electrocatalysts

Language: Английский

Iron‐Locked Hydr(oxy)oxide Catalysts via Ion‐Compensatory Reconstruction Boost Large‐Current‐Density Water Oxidation DOI Creative Commons

Jiao Liu,

Wei Du, Siying Guo

et al.

Advanced Science, Journal Year: 2023, Volume and Issue: 10(16)

Published: April 7, 2023

Nickel-iron based hydr(oxy)oxides have been well recognized as one of the best oxygen-evolving catalysts in alkaline water electrolysis. A crucial problem, however, is that iron leakage during prolonged operation would lead to oxygen evolution reaction (OER) deactivation over time, especially under large current densities. Here, NiFe-based Prussian blue analogue (PBA) designed a structure-flexible precursor for navigating an electrochemical self-reconstruction (ECSR) with Fe cation compensation fabricate highly active hydr(oxy)oxide (NiFeO

Language: Английский

Citations

47
Making Ternary‐Metal Hydroxysulfide Catalyst via Cathodic Reconstruction with Ion Regulation for Industrial‐Level Hydrogen Generation DOI
Fang Peng, Mingze Zhu,

Jiao Liu

et al.

Advanced Energy Materials, Journal Year: 2023, Volume and Issue: 13(35)

Published: July 21, 2023

Abstract Deep insight into electrochemical reconstruction aids in the decoding of electrocatalytic mechanisms and development design principles for advanced catalysts. Despite recent achievements, research concerning cathodic is still lacking compared to anodic variety. This work captures electroreductive dynamics over bimetal Ni–Mo sulfide by various in/ex situ techniques, whereby steered with ion regulation achieve a heterogeneous Ni–Mo–Fe ternary metal hydroxysulfide (NMFSOH) as robust hydrogen‐evolving catalyst that competent industrial‐level water electrolysis. The thermodynamically adaptive heterosynergism resultant NMFSOH can coordinate dissociation hydrogenation alkaline hydrogen evolution reaction even at high current densities. A flow‐type electrolyzer dual electrodes affords an electricity consumption 3.99 kW h Nm −3 electricity‐to‐hydrogen efficiency 88.7%, manifesting its competitive cost‐effectiveness toward practical applications. study showcases ion‐regulatory effective strategy construct high‐performance electrocatalysts.

Language: Английский

Citations

43
Nanoporous Nonprecious High‐Entropy Alloys as Multisite Electrocatalysts for Ampere‐Level Current‐Density Hydrogen Evolution DOI Creative Commons
Hang Shi,

Xin‐Ying Sun,

Shu‐Pei Zeng

et al.

Small Structures, Journal Year: 2023, Volume and Issue: 4(9)

Published: April 25, 2023

Developing robust nonprecious metal‐based electrocatalysts toward hydrogen evolution reaction is crucial for large‐scale production via electrochemical water splitting. Herein, surface high‐entropy NiFeCoCuTi alloy on column‐nanostructured nanoporous Ni skeleton reported as multisite electrocatalyst highly efficient in nonacidic environments by making use of heterogeneous atoms with distinct and hydroxyl adsorption behaviors to accelerate dissociation mediate intermediates combination into molecules. Associated the that facilitates electron transfer/mass transportation enables accessible abundant electroactive sites, self‐supported monolithic electrode exhibits superior (HER) electrocatalysis, low onset overpotentials Tafel slopes. It only takes overpotential ≈209 mV deliver ultrahigh current density 2 A cm −2 , along exceptional stability more than 240 h, 1 m KOH electrolyte. These outstanding properties make (HEA) attractive candidate cathode material electrolysis suggest HEAs ideal platform develop electrocatalysts.

Language: Английский

Citations

42
Interfacial built‐in electric fields facilitating surface reconstruction in heterojunction electrocatalysts for boosting water oxidation and simulated seawater oxidation DOI
Hui Xu, Lei Jin, Kun Wang

et al.

Fuel, Journal Year: 2024, Volume and Issue: 369, P. 131716 - 131716

Published: April 17, 2024

Language: Английский

Citations

37
In Situ Raman Study of Surface Reconstruction of FeOOH/Ni3S2 Oxygen Evolution Reaction Electrocatalysts DOI
Mengxin Chen, Yuanyuan Zhang, Ji Chen

et al.

Small, Journal Year: 2024, Volume and Issue: 20(23)

Published: Jan. 2, 2024

Abstract Construction of heterojunctions is an effective strategy to enhanced electrocatalytic oxygen evolution reaction (OER), but the structural active phases and synergistic mechanism still lack in‐depth understanding. Here, FeOOH/Ni 3 S 2 heterostructure supported on nickel foam (NF) through a two‐step hydrothermal‐chemical etching method reported. In situ Raman spectroscopy study surface reconstruction behaviors /NF indicates that Ni can be rapidly converted NiOOH, accompanied by phase transition from α ‐FeOOH β during OER process. Importantly, deep analysis Ni─O bond reveals FeOOH regulate lattice disorder NiOOH for improved catalytic activity. Density functional theory (DFT) calculations further confirm NiOOH/FeOOH possess strengthened adsorption O‐containing intermediates, as well lower energy barrier toward OER. As result, exhibits promising activity stability in alkaline conditions, requiring overpotential 268 mV @ 100 mA cm −2 long‐term over 200 h at current density . This work provides new perspective understanding heterogeneous electrocatalysts

Language: Английский

Citations

35