Carbon fiber paper supported interlayer space enlarged Ni2Fe-LDHs improved OER electrocatalytic activity

Zhong, Haihong; Cheng, Xiaokang; Xu, Hantao; Li, Lin; Li, Dianqing; Tang, Pinggui; Alonso‐Vante, Nicolas; Feng, Yongjun

doi:10.1016/j.electacta.2017.11.098

Cited by 43 publications

(24 citation statements)

References 37 publications

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“…[15] For instance, Ni 2 Fe-LDH supported on ac onductive carbon fiber showed good activity toward OER with al ow overpotential of 289 mV to reach ac urrent density of 10 mA cm À2 (h 10 ) and as mall Ta fel slope of 39 mV dec À1 . [16] In comparison, NiCo-LDH nanosheet arrays grown on nickel foam displayed ar elatively similar h 10 of 290 mV,b ut with ah igherT afel slope of 113mVdec À1 . [17] Various methods have been developed to improve the OER activity of LDH-based materials including exfoliation, doping, and hybridization.…”

Section: Introductionmentioning

confidence: 94%

“…[60,61] Further,t he presence of Ni 2 + and Co 2 + can help to stabilizeF e 3 + and connect Fe 3 + to the conducting electrode. [16] The synergetic cooperation of all the above factors leads to the high electrocatalytic activity of NiCo-1.0Fe LDH. The sudden decrease in the OER activity of NiCo-1.5Fe may be attributed to the formation of electrically insulating FeOOH resultingf rom the high Fe content (13.6 wt.…”

Section: Oer Performancementioning

confidence: 99%

“…LDHs refer to a class of 2D compounds composed of divalent and trivalent metal cations, which are able to combine electrochemically active elements, such as Ni, Fe, and Co . For instance, Ni 2 Fe‐LDH supported on a conductive carbon fiber showed good activity toward OER with a low overpotential of 289 mV to reach a current density of 10 mA cm −2 ( η 10 ) and a small Tafel slope of 39 mV dec −1 . In comparison, NiCo‐LDH nanosheet arrays grown on nickel foam displayed a relatively similar η 10 of 290 mV, but with a higher Tafel slope of 113 mV dec −1 .…”

Section: Introductionmentioning

confidence: 99%

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Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

et al. 2019

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Layered double hydroxides (LDHs) containing first‐row transition metals such as Fe, Co, and Ni have attracted significant interest for electrocatalysis owing to their abundance and excellent performance for the oxygen evolution reaction (OER) in alkaline media. Herein, the assembly of holey iron‐doped nickel‐cobalt layered double hydroxide (NiCo‐LDH) nanosheets (‘holey nanosheets’) is demonstrated by employing uniform Ni–Co glycerate spheres as self‐templates. Iron doping was found to increase the rate of hydrolysis of Ni–Co glycerate spheres and induce the formation of a holey interconnected sheet‐like structure with small pores (1–10 nm) and a high specific surface area (279 m2 g−1). The optimum Fe‐doped NiCo‐LDH OER catalyst showed a low overpotential of 285 mV at a current density of 10 mA cm−2 and a low Tafel slope of 62 mV dec−1. The enhanced OER activity was attributed to (i) the high specific surface area of the holey nanosheets, which increases the number of active sites, and (ii) the improved kinetics and enhanced ion transport arising from the iron doping and synergistic effects.

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Section: Introductionmentioning

confidence: 94%

Section: Oer Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

et al. 2019

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“…Hydroxide-layered materials are typically synthesized using well-known methods, such as solvo/hydro-thermal [8,9,[18][19][20] and co-precipitation approaches [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

“…Similarly to the hydrothermal synthesis of NiCo LDH, the product is collected after several hours as a result of the slow dropwise addition and/or ageing of the mixed solution [8,9,21,22,26,27].…”

Section: Introductionmentioning

confidence: 99%

Impact of cation redox chemistry on continuous hydrothermal synthesis of 2D-Ni(Co/Fe) hydroxides

et al. 2019

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Continuous hydrothermal flow synthesis (CHFS) is a facile, upscalable and costefficient synthetic method enabling the nanostructuring of advanced functional materials in steady conditions, i.e. not in batch synthesis. In this paper, we use CHFS to crystallize NiCo-and NiFe-Hydroxides in water solution with 2D nanofeatures. By tuning the synthetic parameters, we disclose the key role of the cation redox chemistry in the transition between two competitive phases: from 2D-nanoplatelets of brucite to layered double hydroxides (LDH). For controlling the precipitation of different Ni,Fe,Co-Hydroxide phases, we propose the combined use of an oxidizing (H 2 O 2 ) and a complexing agent (NH 3 ). At temperatures as low as 80 °C, the presence of H 2 O 2 and a low concentration of NH 3 favour the Ni 2+ /Co 3+ over Ni 2+ /Co 2+ oxidation states, shifting the product structure from brucite phase (temperatures > 80 °C) to LDH. Conversely, for the NiFe-Hydroxides the transition from LDH (temperatures ≤ 80 °C) to brucite phase (temperatures > 80 °C) is controlled by the reaction temperature only. Due to the high stability ofFe 3+ , the synthesis of NiFe products by CHFS does not require oxidizing and complexing agents, resulting in a robust process for large-scale production.

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Layered Metal Oxide Nanosheets with Enhanced Interlayer Space for Electrochemical Deionization

et al. 2023

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Carbon fiber paper supported interlayer space enlarged Ni2Fe-LDHs improved OER electrocatalytic activity

Cited by 43 publications

References 37 publications

Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

Holey Assembly of Two‐Dimensional Iron‐Doped Nickel‐Cobalt Layered Double Hydroxide Nanosheets for Energy Conversion Application

Impact of cation redox chemistry on continuous hydrothermal synthesis of 2D-Ni(Co/Fe) hydroxides

Layered Metal Oxide Nanosheets with Enhanced Interlayer Space for Electrochemical Deionization

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