Iron‐nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities

Hu, Hua‐Shuai; Si, Si; Liu, Ruijie; Wang, Chong‐Bin; Feng, Yuan‐Yuan

doi:10.1002/er.5636

Cited by 25 publications

(19 citation statements)

References 58 publications

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“…4,5 The demand for high active and durable electrocatalysts based on earth-abundant elements has been an important topic. [6][7][8] Transition metal oxides are one of main alternative catalysts for OER, with the performance close to IrO 2 or RuO 2 in alkaline media. [9][10][11][12][13][14] Among them, cobalt-based oxides, especially Co 3 O 4 that constituted of Co 2+ and Co 3+ , have drawn great attention as competitive candidates with feasible abundance, low cost, and relatively high stability in alkaline environment.…”

Section: Introductionmentioning

confidence: 99%

High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

Yin

et al. 2021

Intl J of Energy Research

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To reduce the overpotential of electrocatalytic oxygen evolution reaction (OER) for high-efficiency water splitting, a series of 2 to 5 nm ultrafine spinel Co 3 O 4 nanoparticles (NPs) with varied amount of lattice-doped Te (XTe-Co 3 O 4 , X represents the nominal molar ratio Te/Co of 0, 2, 4, 6, 8%) as catalysts were prepared through a simple hydrothermal synthesis method. The 6% Te-Co 3 O 4 catalyst was optimized to obtain the overpotential as low as 313 mV at 10 mA cm À2 , a small Tafel slope of 75 mV dec À1 in 1 M KOH for OER, outperforming this series and many reported Co 3 O 4 -based catalysts. Te doping introduced lattice distortion and resulted in smaller size of Te-Co 3 O 4 NPs with enlarged surface area for more accessible active sites. Oxygen vacancies were created to modify the electronic structure, improve the active sites density, and decrease the kinetic energy barriers of XTe-Co 3 O 4 . The electronic conductivity of 6%Te-Co 3 O 4 was improved to accelerate the charge transfer efficiency. All these effects contributed to promoting the reaction kinetics and minimizing the OER overpotentials for high-performance electrocatalysis.

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Section: Introductionmentioning

confidence: 99%

High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

Yin

et al. 2021

Intl J of Energy Research

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“…Figure c shows the Fe 2p XPS spectrum, in which two main peaks located at 711.9 and 725.3 eV belong to Fe 2p 3/2 and Fe 2p 1/2 of Fe 3+ , respectively Figure d displays the O 1s spectrum, where O1 (at 532.4 eV) represents hydroxyl oxygen adsorbed on the surface of water molecules, O2 (at 531.3 eV) stands for the oxygen vacancy (Ov), and O3 (at 529.9 eV) indicates metal-oxygen. ,− The presence of oxygen vacancies (Ov) could enhance electrical conductivity, accelerate surface redox kinetics, and create plenty of active sites, thus promoting the activity for the OER process vastly. − …”

Section: Resultsmentioning

confidence: 99%

NiFe Layered Double Hydroxide/FeOOH Heterostructure Nanosheets as an Efficient and Durable Bifunctional Electrocatalyst for Overall Seawater Splitting

et al. 2021

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Electrolysis of seawater can not only desalinate seawater but also produce high-purity hydrogen. Nevertheless, the presence of chloride ions in seawater will cause electrode corrosion and also undergo a chlorine oxidation reaction (ClOR) that competes with the oxygen evolution reaction (OER). Therefore, highly efficient and long-term stable electrocatalysts are needed in this field. In this work, an advanced bifunctional electrocatalyst based on NiFe layered double hydroxide (LDH)/FeOOH heterostructure nanosheets (NiFe LDH/FeOOH) was synthesized on nickel–iron foam (INF) via a simple electrodeposition method. The NiFe LDH/FeOOH electrode demonstrates excellent electrocatalytic activity and stability, which results from the strong interaction between FeOOH and NiFe LDH. Furthermore, ex situ X-ray photoelectron spectroscopy (XPS) and in situ Raman spectroscopy revealed the catalytic process and also demonstrated that the NiFe LDH/FeOOH heterostructure could facilitate the formation of active NiOOH species in the reaction. The obtained NiFe LDH/FeOOH catalyst displays low overpotentials of 181.8 mV at 10 mA·cm–2 for hydrogen evolution reaction (HER) and 286.2 mV at 100 mA·cm–2 for OER in the 1.0 M KOH + 0.5 M NaCl electrolyte. Furthermore, it also exhibits a low voltage of 1.55 V to achieve the current density of 10 mA·cm–2 and works steadily for 105 h at 100 mA·cm–2 for overall alkaline simulated seawater splitting. This work will afford a valid strategy for designing a non-noble metal catalyst for seawater splitting.

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“…Figure 3D depicts the Fe2p spectra, the peaks of 712 and 725 eV or so are ascribed to Fe2p3/2 and F I G U R E 1 FESEM images of (A) CA-400; (B) CA@Fe(1:3)-600; (C) CA@Fe(1:3)-700; (D) CA@Fe(1:3)-800; (E) CA@Fe(1:4)-800; (F) CA@Fe(1:5)-800 Fe2p1/2, respectively. 29,30 Compared with CA@Fe(1:3)-600 and CA@Fe(1:3)-700, CA@Fe(1:3)-800 shifts to lower binding energy of Fe2p. Generally speaking, the decrease in binding energy reflects an enhanced electron screening effect, suggesting more electron density and faster charge transfer in CA@Fe(1:3)-800.…”

Section: Resultsmentioning

confidence: 99%

“…However, CA@Fe(1:3)‐600 and CA@Fe(1:3)‐700 almost have no pyridine‐N ingredient in themselves. Figure 3D depicts the Fe2p spectra, the peaks of 712 and 725 eV or so are ascribed to Fe2p3/2 and Fe2p1/2, respectively 29,30 . Compared with CA@Fe(1:3)‐600 and CA@Fe(1:3)‐700, CA@Fe(1:3)‐800 shifts to lower binding energy of Fe2p.…”

Section: Resultsmentioning

confidence: 99%

Biomass carbon dual‐doped with iron and nitrogen for high‐performance electrocatalyst in water splitting

Zhou

Yan²,

Xiang

et al. 2021

Int J Energy Res

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Energy crisis has become an urgent problem in the world. Hydrogen is a continuous and clean energy, but traditional electrocatalytic materials for water splitting have the shortcomings including high cost and low hydrogen production efficiency. Herein, we prepare a biomass carbon-based electrocatalyst doped with iron and nitrogen. The overpotential of so-obtained CA (abbreviation of "carbon from amaranth") @Fe(1:3)-800 is only 265 mV at 10 mA cm −2 for oxygen evolution reaction (OER), as well as the Tafel slope is 76.7 mV dec −1 , which are much superior to the results of CA-800 (the overpotential is 514 mV and the Tafel slope is 160.2 mV dec −1 ). It shows the positive influences of dual-doping with iron and nitrogen in biomass carbon. Our work opens up a low-cost and green avenue for fabricating high-performance electrocatalyst in hydrogen production field.

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Iron‐nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities

Cited by 25 publications

References 58 publications

High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

NiFe Layered Double Hydroxide/FeOOH Heterostructure Nanosheets as an Efficient and Durable Bifunctional Electrocatalyst for Overall Seawater Splitting

Biomass carbon dual‐doped with iron and nitrogen for high‐performance electrocatalyst in water splitting

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Iron‐nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities

Cited by 25 publications

References 58 publications

High‐performance Te‐doped Co 3 O 4 nanocatalysts for oxygen evolution reaction

High‐performance Te‐doped Co 3 O 4 nanocatalysts for oxygen evolution reaction

NiFe Layered Double Hydroxide/FeOOH Heterostructure Nanosheets as an Efficient and Durable Bifunctional Electrocatalyst for Overall Seawater Splitting

Biomass carbon dual‐doped with iron and nitrogen for high‐performance electrocatalyst in water splitting

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High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction

High‐performance Te‐doped Co ₃ O ₄ nanocatalysts for oxygen evolution reaction