Controlled synthesis of dandelion-like NiCo2O4 microspheres and their catalytic performance for peroxymonosulfate activation in humic acid degradation

Xia, Tian; Tian, Chen; Nie, Yulun; Dai, Chu; Yang, Chao; Tian, Na; Zhou, Zhaoxin; Li, Yong; Wang, Yanxin

doi:10.1016/j.cej.2017.08.115

Cited by 114 publications

(31 citation statements)

References 41 publications

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“…In Figure 6b, Ni 2p spectra has two main peaks (2p 3/2 at 853.7 eV accompanied with a shoulder, 2p 1/2 at 871.8 eV), with two satellite peak at 860.8 eV, and 879.2 eV. After fitting, Ni 2+ contains two peaks at 853.9 eV and 870.9 eV, and the peaks at 855.3 eV and 872.7 eV belonged to Ni 3+ , respectively [26]. The surface Co 3+ /Co 2+ proportions are obtained by peak area integral, and the results are summarized in Table 1.…”

Section: Textural Analysismentioning

confidence: 99%

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Wang

et al. 2019

Catalysts

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Rational design LDHs (layered double hydroxides) with 3D hierarchical hollow structures have generated widespread interest for catalytic oxidation due to the high complexity in shell architecture and composition. Herein, we reported a handy two-step method to construct a 3D hierarchical NiCo2O4/NiO nanocage. This synthetic strategy contains a partial in situ transformation of ZIF-67 (zeolitic imidazolate framework-67) into Co-NiLDH yolk-shelled structures following ethanol etching, and a structure-preserved transformation from Co-NiLDH@ZIF-67 to a biphase nanocage following calcination. CoNi-yh-T (varied reaction time and calcination temperature) nanocages were investigated systematically by Brunauer–Emmett–Teller (BET), X-ray photoelectron spectroscopy (XPS), H2- temperature-programmed reduction (TPR), NH3-temperature-programmed desorption (TPD) and studied for toluene oxidation. The CoNi-6h-350 sample showed much higher activity with 90% toluene conversion (T90) at 229 °C at a high space velocity (SV = 60,000 mL g−1 h−1) than other catalysts (T90 >240 °C). Abundant surface high valence Co ions caused by the novel hierarchical nanostructures, together with adsorbed oxygen species and abundant medium-strength surface acid sites, played a key role for catalytic activities.

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Section: Textural Analysismentioning

confidence: 99%

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Wang

et al. 2019

Catalysts

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“…Further, the Ni 2p 3/2 and Ni 2p 1/2 can be deconvoluted into seven peaks, which are two kinds of nickel components (Ni 2+ and Ni +3 ), and three shake‐up satellite (sat.) peaks (Figure 3B), respectively 36‐38 . Likewise, the core‐level Co 2p spectra can be distributed with two satellite peaks (sat.)…”

Section: Resultsmentioning

confidence: 94%

“…and four distinct spin-orbit doublets features of Co 2+ and Co 3+ species (Figure 3C), respectively. [36][37][38] However, the NCO11 and NCO12 samples assemble without satelite peaks, signifying that the absence of Co 2+ in the samples. The majority of Co atoms in the crystal lattice of the NCO11 and NCO12 samples are featured with more abundant Co 3+ cations than the NCO21 samples.…”

Section: Resultsmentioning

confidence: 99%

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Nanowire architectured porous bimetallic transition metal oxides for high performance hybrid supercapacitor applications

Sivakumar

Jung

Raj

et al. 2021

Intl J of Energy Research

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The electrochemical performance of the Faradaic battery-type binary metal oxide electrodes is dependent on the desirable architecture and the optimal cationic ratio. Herein, we report one-dimensional nanowire-like bimetallic spinel Ni x Co 3-x O 4 (NCO) electrode materials for high performance hybrid supercapacitor (HSC) applications. This unique nanowire architecture is beneficial for providing abundant exposed active sites onto the large accessible surface area, which results in facilitating ion transporting pathways. Remarkably, the optimal NCO electrode with the ratio of Ni/Co of 1 to 1 (NCO11) achieves the maximum specific capacitance of 1033 F g À1 at 1 A g À1 and the excellent rate capability of 74.55% at 30 A g À1 , far exceeding those of their single counterparts. Furthermore, the as-assembled HSCs integrating NCO11 and AC electrodes deliver large energy and power densities of 41.54 W h kg À1 and 44.95 kW kg À1 with excellent cyclic retention (96.12%).

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“…Furthermore, the high-resolution Co 2p spectrum (Figure 3E) suggested the existence of Co 2+ and Co 3+ , [23] whereas the high-resolution Ni 2p spectrum (Figure 3F) indicated the presence of Ni 2+ and Ni 3+ . [24] It is worth noticing that both redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ could provide richer redox reactions, thereby boosting the catalytic activity.…”

Section: Nanozyme Characterizationmentioning

confidence: 99%

Construction of pH‐Dependent Nanozymes with Oxygen Vacancies as the High‐Efficient Reactive Oxygen Species Scavenger for Oral‐Administrated Anti‐Inflammatory Therapy

Zhao

Yang

Zhao

et al. 2021

Adv Healthcare Materials

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It is of great significance to eliminate excessive reactive oxygen species (ROS) for treating inflammatory bowel disease (IBD). Herein, for the first time, a novel nanozyme NiCo 2 O 4 @PVP is constructed via a step-by-step strategy. Noticeably, the existence of oxygen vacancy in the NiCo 2 O 4 @PVP is helpful for capturing oxygenated compounds, while both redox couples of Co 3+ /Co 2+ and Ni 3+ /Ni 2+ will offer richer catalytic sites. As expected, the obtained NiCo 2 O 4 @PVP exhibits pH-dependent multiple mimic enzymatic activities. Benefiting from the introduction of polyvinylpyrrolidone (PVP), the NiCo 2 O 4 @PVP possesses good physiological stability and excellent biosafety in stomach and intestines' environment. Meanwhile, the NiCo 2 O 4 @PVP also presents strong scavenging activities to ROS in vitro, including • O 2 − , H 2 O 2 , as well as • OH. Furthermore, a dextran sodium sulfate (DSS)-induced colitis model is established for evaluating the anti-inflammatory activity of NiCo 2 O 4 @PVP in vivo. Based on the size-mediated and charge-mediated mechanisms, the nanozyme can pass through the digestive tract and target the inflamed site for oral-administrated anti-inflammatory therapy. More interestingly, compared with the model group, the expression levels of inflammatory factors (e.g., Interleukin-6 (IL-6), Interleukin-1𝜷 (IL-1𝜷), tumor necrosis factor-𝜶 (TNF-𝜶), and inducible nitric oxide synthase (iNOS)) in colon of mice show a significant decrease after nanozyme intervention, thereby inhibiting the development of IBD. In short, current work provides an alternative therapy for patients suffering from IBD.

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Controlled synthesis of dandelion-like NiCo2O4 microspheres and their catalytic performance for peroxymonosulfate activation in humic acid degradation

Cited by 114 publications

References 41 publications

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Self-Templating Synthesis of 3D Hierarchical NiCo2O4@NiO Nanocage from Hydrotalcites for Toluene Oxidation

Nanowire architectured porous bimetallic transition metal oxides for high performance hybrid supercapacitor applications

Construction of pH‐Dependent Nanozymes with Oxygen Vacancies as the High‐Efficient Reactive Oxygen Species Scavenger for Oral‐Administrated Anti‐Inflammatory Therapy

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