N<sup>+</sup>-ion irradiation engineering towards the efficient oxygen evolution reaction on NiO nanosheet arrays

Xia, Baorui; Wang, Tongtong; Jiang, Xue; Li, Jun; Zhang, Tongming; Xi, Pinxian; Gao, Daqiang; Xue, Desheng

doi:10.1039/c9ta00023b

Cited by 50 publications

(27 citation statements)

References 34 publications

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“…1c). This peak was assigned to N-Ni bonding [18] and thus confirmed N doping. Figure 1d presents high-resolution Ni 2p core-level spectra.…”

Section: Resultsmentioning

confidence: 74%

“…However, this method does not allow one to change the intrinsic properties of TMOs, and the use of some dark-colored additives may remarkably deteriorate electrochromic performance, e.g., by affecting transmittance modulation. N doping has been reported as an alternative strategy for improving the intrinsic electronic conductivity of TMOs [18]. For example, Yu et al reported [20].…”

Section: Introductionmentioning

confidence: 99%

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N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

Xue

Wang

Zhang

et al. 2020

J Mater Sci: Mater Electron

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The performance of electrochromic supercapacitors (ESCs) can be improved by the use of electrodes with high electronic conductivity and ion transport ability. Herein, two-dimensional (2D) N-doped NiO ultrathin nanosheets (N-NiO UTNSs) synthesized in situ on fluorine-doped tin oxide glass were used as bifunctional ESC electrodes. These electrodes exhibited an elevated specific capacitance (540 F g -1 at 1 A g -1 ), superior cycling stability (85% capacitance retention after 10,000 cycles), and good electrochromic properties (color change from colorless to black with a transmittance modulation of 73% and a coloration efficiency of up to 83.47 cm 2 C -1 at 550 nm), which was ascribed to the high electronic conductivity of NiO (due to N doping) and the short ion diffusion path (due to the ultralow nanosheet thickness). To further explore the practical applications of N-NiO UTNSs, we constructed asymmetric ESCs by integrating NiO films with Fe 2 O 3 films and revealed that these devices displayed applied voltage-dependent colors. Two charged asymmetric ESCs connected in series could light up a red light-emitting diode and changed color synchronously with charge state alteration. Thus, our results contribute to the development of Nibased electrochromic supercapacitors exhibiting charge state-dependent color changes.

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“…1c). This peak was assigned to N-Ni bonding [18] and thus confirmed N doping. Figure 1d presents high-resolution Ni 2p core-level spectra.…”

Section: Resultsmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

Xue

Wang

Zhang

et al. 2020

J Mater Sci: Mater Electron

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“…The SA Ir doping into lattices of NiO can be directly detected from Figure 2c. Because of the different valence states of Ni and Ir positive ions, the coordination structure of the Ni–O octahedron will be destroyed and some deficient sites, for example, oxygen vacancies, [ 34,35 ] will be introduced, as shown in Figure 2e,f. Moreover, the incidentally distorted crystal lattice can be also found (Figure 2f).…”

Section: Resultsmentioning

confidence: 99%

Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation

et al. 2021

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The NiO‐based electrocatalytic oxygen evolution reaction (OER) of water splitting is recognized as a promising approach to produce clean H2 fuel. However, the OER performance is still low, and especially, the overpotential is larger than 200 mV at the current density of 10 mA cm−2. Herein, an Ir@IrNiO sample is prepared with single‐atom (SA) Ir4+ doping and surface metallic Ir nanoparticles loaded onto the NiO. Owing to the bonding of the loaded Ir with surface‐exposed Ni2+, the nearby Ni atoms exist in the +3 valence state, that is, the surface‐loaded Ir particles behave like a stabilizer for the Ni3+ sites. Under the synergistic effect of SA Ir4+ and high‐valance‐state Ni3+, the Ir@IrNiO nanostructure effectively reduces the overpotential to 195 mV at a current density of 10 mA cm−2. Moreover, it gives an Ir‐content‐normalized current density of 0.0457 A mgIr−1, 72.1 times higher than that of the best commercialized IrO2 (6.33 × 10−4 A mgIr−1), under the condition of 1.5 V versus reversible hydrogen electrode. Operando Raman and X‐ray absorption fine‐structure (XAFS) measurements reveal that there are more surface‐active species of Ni3+, which adsorb and activate water molecules to form Ni3+–*OH at low voltage, the intermediate of Ni4+–•O is then formed at a relatively high bias voltage, and then the •O is transferred to the SA Ir4+ sites to generate Ir4+–O–O with OH at increased voltage. This work can help design more SA‐based highly active OER materials.

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“…Coupling these nonprecious optical antennas with catalysts to leverage plasmon‐promoted electrocatalytic HER/OER represents an intriguing subject of future research. Furthermore, some materials, such as NiO, [ 209,210 ] MoO 3− x , [ 211,212 ] and WO 3− x , [ 213,214 ] are intrinsically active for HER/OER while manifesting pronounced plasmonic effect. They themselves can simultaneously harvest light to excite hot electrons as well as provide active sites for redox reactions.…”

Section: Light‐assisted Electrocatalytic Her/oermentioning

confidence: 99%

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

et al. 2020

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promising alternative to fossil fuels. Water electrolysis by renewable resourcederived electricity represents a facile and green route to produce H 2. [1-13] Generally, the key to implement high-performance water splitting is to develop economically viable, efficient, and robust electrocatalysts to lower the activation potential barriers. Thus far, researchers have devoted extensive enthusiasm to the investigation of electrocatalysts. Currently, most efforts have been taken on the search for new materials, [14-16] regulation of morphology, [17] crystallinity, [18] facet, [19] component, [20-24] defect, [25,26] matter phase, [27,28] or the compositing of various materials with synergy. [29-36] However, the performances of emerging nonnoble electrocatalysts still lag behind those of noble ones. To address this issue, researchers have turned their attention beyond the electrocatalysts themselves. Field-assisted electrocatalysis is the electrocatalytic reaction proceeded in the presence of a field. It represents a promising methodology since it exerts an additional degree of freedom to engineer an electrochemical process. Inspiringly, indisputable improvements in electrocatalytic hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) have been implemented with the assist of various fields, including electric field, magnetic field, strain, and light. For example, the electrocatalytic HER of a MoS 2 nanosheet is markedly boosted by simply exploiting a back gate voltage of 5 V. [37] Its overpotential at −100 mA cm −2 is decreased from 240 to 38 mV. In addition, enhancement of alkaline water electrolysis is achieved by applying a moderate magnetic field (≤450 mT) to an electrocatalytic anode consists of highly magnetic electrocatalysts. [38] Its current density increments are beyond 100%. Furthermore, the HER activity of β-PdH x increases monotonically as the applied strain increases from 0% to 4.5%. [39] Lastly, an approximately threefold increase in current density of Au-MoS 2 for electrocatalytic HER is realized upon the illumination of IR light. [40] These results undoubtedly elucidate that applying a field during electrocataly sis opens up great opportunities toward further improving electrocatalytic activity. Moreover, this approach provides merits of facile, dynamical, continuous, reversible, and universal control. Despite fascinating achievements, these investigations are relatively scattered. The underneath mechanisms and principles Hydrogen fuel is considered as one of the most clean renewable resources, warranting it a primary alternative to fossil fuels for future energy supplies. Electrocatalytic water splitting is an eco-friendly technique for high-purity hydrogen production. However, the sluggish dynamics of its two halfreactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), are tough challenges impeding the practical application of this technology. In these years, external field-assisted HER and OER have attracted extensive research interests. Herein, the effects o...

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N⁺-ion irradiation engineering towards the efficient oxygen evolution reaction on NiO nanosheet arrays

Abstract: The oxygen evolution reaction (OER) is an essential process in water splitting, which is highly relevant to the new generation of energy exploration approaches. N+ ions irradiation is an effective method for improving the OER electrocatalytic capacity of NiO.

Cited by 50 publications

References 34 publications

N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

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N+-ion irradiation engineering towards the efficient oxygen evolution reaction on NiO nanosheet arrays

Abstract: The oxygen evolution reaction (OER) is an essential process in water splitting, which is highly relevant to the new generation of energy exploration approaches. N+ ions irradiation is an effective method for improving the OER electrocatalytic capacity of NiO.

Cited by 50 publications

References 34 publications

N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

N-doped two-dimensional ultrathin NiO nanosheets for electrochromic supercapacitor

Single‐Atom Doping and High‐Valence State for Synergistic Enhancement of NiO Electrocatalytic Water Oxidation

Promoting Electrocatalytic Hydrogen Evolution Reaction and Oxygen Evolution Reaction by Fields: Effects of Electric Field, Magnetic Field, Strain, and Light

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N⁺-ion irradiation engineering towards the efficient oxygen evolution reaction on NiO nanosheet arrays