Facile synthesis of NiS hierarchical hollow cubes via Ni formate frameworks for high performance supercapacitors

Ma, Xin; Zhang, Li; Xu, Guancheng; Zhang, Chuyang; Song, Huijun; He, Yitao; Zhang, Chi; Jia, Dianzeng

doi:10.1016/j.cej.2017.03.033

Cited by 140 publications

(38 citation statements)

References 50 publications

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“…The corresponding pore diameter distribution plots were inset to each panel in Figures 4 and S5, where one can find that NiS 2 /C and Fe-NiS 2 /C-X samples consist of hierarchical pore structures, with both micropores (< 2.0 nm) and mesopores of 2.0~10.0 nm. As is well documented, mesopores are beneficial to the mass/ions diffusion and transport process and, hence, the presence of abundant mesopores may improve the electrochemical reaction kinetics [24]. It is evident that the introduction of Fe to the lattices of NiS 2 can enhance the specific surface area, and it is most likely that the introduction of heteroatom Fe to the lattices of NiS 2 causes structural defects although the radius of Fe 3+ close to that of Ni 2+ [29] and, hence, impedes the growth of large-scale NiS 2 crystals, which finally leads to an increased surface roughness for Fe-NiS 2 /C-30 (Figure 1c,d), as compared with NiS 2 /C (Figure 1b).…”

Section: Resultsmentioning

confidence: 98%

“…The synthesis process of a series of Fe-NiS2/C-X samples was schematically illustrated in Scheme 1, where NiS2/C composite nanoparticles were firstly synthesized by in situ vulcanization and carbonization of the Ni-containing MOF nanoparticles via a solvothermal method [24], while a secondary solvothermal treatment subsequently doped ferric ions into the crystalline lattices of NiS2. Figure S1) and show a spindle-like particle morphology, with a predominant length in the range of 100-500 nm (Figures 1a and S2a,b).…”

Section: Resultsmentioning

confidence: 99%

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Solvothermally Doping NiS2 Nanoparticles on Carbon with Ferric Ions for Efficient Oxygen Evolution Catalysis

et al. 2019

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Exploring efficient non-precious metal based electrocatalysts for the oxygen evolution reaction (OER) is a prerequisite to implement the widespread application of a water electrolyzer and metal-air batteries. Herein, Fe-doped NiS2 nanoparticles on a carbon matrix (Fe-NiS2/C) are facilely prepared via a two-step solvothermal process, where Ni-containing metal organic frameworks (Ni-MOFs) are vulcanized in situ and carbonized by a solvothermal method to form abundant NiS2 nanoparticles homogeneously distributed on a carbon matrix (NiS2/C), followed by doping with ferric ions via a similar solvothermal treatment. The resulting Fe-NiS2/C nanoparticle composites show a rougher surface than the NiS2/C parent, likely due to the formation of more structural defects after ferric ion doping, which maximizes the exposure of active sites. Moreover, ferric ion doping can also regulate the surface electronic state to reduce the activation energy barrier for OER on NiS2/C sample. With these merits, the best sample Fe-NiS2/C-30 only requires a potential of +1.486 V (vs. RHE) to reach an OER current density of 10 mA cm−2 and can retain 96.85% of its initial current after continuous working for about 10 h in 1.0 M KOH aqueous solution, along with a small Tafel slope of 45.66 mV/dec, outperforming a commercial RuO2 catalyst. The results in this work enrich the method to tailor the catalytic activity of transition metal sulfides for electrochemical energy technologies.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Solvothermally Doping NiS2 Nanoparticles on Carbon with Ferric Ions for Efficient Oxygen Evolution Catalysis

et al. 2019

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“…Common battery-type transition metal compounds used as cathode materials, such as nickel oxide, 93 cobalt oxide, 25,94 nickel sulfide, 95,96 and cobalt phosphide, 97 usually behave poor electrical conductivity, slow ion diffusion, and bad cycling stability, thus inducing low rate performance. Such transition metal compounds with low rate performance are not able to meet the needs and greatly limit practical applications.…”

Section: High-conductivity Electrode Materialsmentioning

confidence: 99%

High-rate transition metal-based cathode materials for battery-supercapacitor hybrid devices

Song

Shi

et al. 2021

Nanoscale Adv.

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“…The two synthetic methods are basically the same in the first half part, MoO 3 primary nuclei is formed by the initial reaction. When the amount of primary nuclei continues to accumulate to a certain order of magnitude, these nanoparticles began to grow up due to Ostwald ripening [27,28] and spontaneously gathered together to minimize surface energy and make the whole reaction system tend to thermodynamic equilibrium [29]. When PVP is added to the reaction system, it promotes the directional growth of MoO 3 particles.…”

Section: Formation Mechanismmentioning

confidence: 99%

Facile synthesis of novel MoO3 nanoflowers for high-performance gas sensor

Zeng

2019

J Mater Sci: Mater Electron

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In our work, the novel sparsely and compactly MoO 3 nanoflowers were synthesized by a hydrothermal method assisted with polyvinyl pyrrolidone (PVP) and without any template, respectively. Through X-ray diffraction and scanning electron microscopy, we can confirm that we have prepared high purity MoO 3 and can observe that both nanoflowers are formed by self-assembly of thin nanosheets. They have similar morphology, size and formation mechanism, but differ from pore size and quantity. Because of the above differences, sparsely MoO 3 nanoflowers have a larger specific surface area and form more enclosed micro-reaction chambers that make it difficult for ethanol to escape. Allowing gas molecules to be more widely distributed among the sparsely sample surface and obtained fully reaction time. Thus, the gas sensor based on compactly MoO 3 nanoflowers exhibits a better response and recovery characteristic.

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Facile synthesis of NiS hierarchical hollow cubes via Ni formate frameworks for high performance supercapacitors

Cited by 140 publications

References 50 publications

Solvothermally Doping NiS2 Nanoparticles on Carbon with Ferric Ions for Efficient Oxygen Evolution Catalysis

Solvothermally Doping NiS2 Nanoparticles on Carbon with Ferric Ions for Efficient Oxygen Evolution Catalysis

High-rate transition metal-based cathode materials for battery-supercapacitor hybrid devices

Facile synthesis of novel MoO3 nanoflowers for high-performance gas sensor

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