Experimental and theoretical investigation of reconstruction and active phases on honeycombed Ni3N-Co3N/C in water splitting

Huang, Chao; Zhang, Biao; Wu, Yuzheng; Ruan, Qingdong; Liu, Liangliang; Su, Jianjun; Tang, Yongbing; Liu, Rugeng; Chu, Paul K.

doi:10.1016/j.apcatb.2021.120461

Cited by 75 publications

(42 citation statements)

References 43 publications

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“…Generally, two conditions are favorable to the generation of Ni-based heterostructure via epitaxial growth. [42,45,46] One is the small lattice mismatch between Ni-based heterophases. The other is that the Ni atoms-centered facet of one phase could be bridged well with the Ni atoms-centered or non-Ni atoms-centered phase of another phase in the Ni-based heterophasic system during epitaxial growth.…”

Section: Resultsmentioning

confidence: 99%

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

et al. 2022

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Developing an efficient and non‐precious pH‐universal hydrogen evolution reaction electrocatalyst is highly desirable for hydrogen production by electrochemical water splitting but remains a significant challenge. Herein, a hierarchical structure composed of heterostructured Ni2P‐Ni12P5 nanorod arrays rooted on Ni3S2 film (Ni2P‐Ni12P5@Ni3S2) via a simultaneous corrosion and sulfidation is built followed by a phosphidation treatment toward the metallic nickel foam. The combination of theoretical calculations with in/ex situ characterizations unveils that such a unique sequential phase conversion strategy ensures the strong interfacial coupling between Ni2P and Ni12P5 as well as the robust stabilization of 1D heteronanorod arrays by Ni3S2 film, resulting in the promoted water adsorption/dissociation energy, the optimized hydrogen adsorption energy, and the enhanced electron/proton transfer ability accompanied with an excellent stability. Consequently, Ni2P‐Ni12P5@Ni3S2/NF requires only 32, 46, and 34 mV overpotentials to drive 10 mA cm−2 in 1.0 m KOH, 0.5 m H2SO4, and 1.0 m phosphate‐buffered saline electrolytes, respectively, exceeding almost all the previously reported non‐noble metal‐based electrocatalysts. This work may pave a new avenue for the rational design of non‐precious electrocatalysts toward pH‐universal hydrogen evolution catalysis.

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Section: Resultsmentioning

confidence: 99%

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

et al. 2022

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“…The in situ Raman spectra of Co‐S v ‐MoS 2 show a peak at 479 cm −1 stemming from Co‐OOH/Co‐OH bonds (Figure S17, Supporting Information). [ 61,62 ] Figure 4e displays the corresponding Tafel slopes. Co‐S v ‐MoS 2 exhibits a Tafel slope of 128 ± 4 mV dec −1 , which is less than that of RuO 2 (145 ± 6 mV dec −1 ), suggesting superior OER kinetics possibly due to the large ratio of Co 3+ /Co 2+ .…”

Section: Resultsmentioning

confidence: 99%

Enhanced Activities in Alkaline Hydrogen and Oxygen Evolution Reactions on MoS₂ Electrocatalysts by In‐Plane Sulfur Defects Coupled with Transition Metal Doping

Leng

Zhang

et al. 2022

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Abstract2D transition metal disulfides (TMDs) are promising and cost‐effective alternatives to noble‐metal‐based catalysts for hydrogen production. Activation of the inert basal plane of TMDs is crucial to improving the catalytic efficiency. Herein, introduction of in‐plane sulfur vacancies (Sv) and 3d transition metal dopants in concert activates the basal planes of MoS2 (M‐Sv‐MoS2) to achieve high activities in the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Acetate introducing mild wet chemical etching removes surface S atoms facilitating subsequent cation exchange between the exposed Mo atoms and targeted metal ions in solution. Density‐functional theory calculation demonstrates that the exposed 3d transition metal dopants in MoS2 basal planes serve as multifunctional active centers, which not only reduce ΔGH* but also accelerate water oxidation. As a result, the optimal Ni‐Sv‐MoS2 and Co‐Sv‐MoS2 electrocatalysts show excellent stability and alkaline HER and OER characteristics such as low overpotentials of 101 and 190 mV at 10 mA cm−2, respectively. The results reveal a strategy to activate the inert MoS2 basal planes by defect and doping co‐engineering and the technique can be extended to other types of TMDs for high‐efficiency electrocatalysis beyond water splitting.

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“…At the same time, it has been found that the catalytic effect is mainly caused by the nanoclusters, while the carbon matrix itself has a little catalytic effect. Ni 3 N has been widely reported as active species of OER. − Therefore, the main reason for the improvement of OER performance after N 2 -plasma treatment is the formation of active Ni 3 N. In addition to the activity of Ni 3 N itself, the conductivity of the carbon substrate which acts as a charge transfer channel is also very important for the improvement of OER performance. In our study, N 2 -plasma treatment will not only lead to the conversion of Ni to Ni 3 N but also lead to the N doping of the amorphous carbon substrate.…”

Section: Resultsmentioning

confidence: 99%

“…The OER activity of Ni–N@5min and other similar Ni-based electrocatalysts reported recently have been compared and listed as a table (shown in Table S1). It is found that the OER overpotential of Ni–N@5min nanoclusters is much lower than the previously reported Ni 3 N-related electrocatalysts under similar experiment conditions, including Co-doped Ni/Ni 3 N heterostructure nanosheets, Ni 3 N/N-doped carbon nanotubes, and so on. − The value of Tafel slope is also competitive in various catalysts. The overpotential values were also calculated at high current density (50 and 100 mA/cm 2 ) (Table S1).…”

Section: Resultsmentioning

confidence: 99%

Boosting the OER Performance of Nitrogen-Doped Ni Nanoclusters Confined in an Amorphous Carbon Matrix

Hou

Shi

et al. 2022

Inorg. Chem.

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Nanoclusters are ideal electrocatalysts due to their high surface activity. However, their high activities also lead to serious agglomeration and performance attenuation during the catalytic process. Here, highly dispersed Ni nanoclusters (∼3 nm) confined in an amorphous carbon matrix are successfully fabricated by pulsed laser deposition, followed by rapid temperature annealing treatment. Then, the Ni nanoclusters are further doped with nitrogen element through a clean N2 radio frequency plasma technology. It is found that the nitrogen-doped Ni nanoclusters obtained under optimized conditions showed superior OER performance with a very low overpotential of 240 mV at a current density of 10 mA/cm2, together with good stability. The excellent OER performance of the nanoclusters can be attributed to the unique confined structure and nitrogen doping, which not only provide more active sites but also improve the conductivity. Our work provides a controllable method for the construction of a novel confined structure with controllable nitrogen doping, which can be used as a high-efficiency OER electrocatalyst.

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Experimental and theoretical investigation of reconstruction and active phases on honeycombed Ni3N-Co3N/C in water splitting

Cited by 75 publications

References 43 publications

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

Enhanced Activities in Alkaline Hydrogen and Oxygen Evolution Reactions on MoS₂ Electrocatalysts by In‐Plane Sulfur Defects Coupled with Transition Metal Doping

Boosting the OER Performance of Nitrogen-Doped Ni Nanoclusters Confined in an Amorphous Carbon Matrix

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Experimental and theoretical investigation of reconstruction and active phases on honeycombed Ni3N-Co3N/C in water splitting

Cited by 75 publications

References 43 publications

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

Sequential Phase Conversion‐Induced Phosphides Heteronanorod Arrays for Superior Hydrogen Evolution Performance to Pt in Wide pH Media

Enhanced Activities in Alkaline Hydrogen and Oxygen Evolution Reactions on MoS2 Electrocatalysts by In‐Plane Sulfur Defects Coupled with Transition Metal Doping

Boosting the OER Performance of Nitrogen-Doped Ni Nanoclusters Confined in an Amorphous Carbon Matrix

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Enhanced Activities in Alkaline Hydrogen and Oxygen Evolution Reactions on MoS₂ Electrocatalysts by In‐Plane Sulfur Defects Coupled with Transition Metal Doping