Remarkable enhancement of the electrochemical properties of Co3O4 nanowire arrays by in situ surface derivatization of an amorphous phosphate shell

Chen, Mingyue; Li, Wenhui; Ma, Wenhao; Qi, Pengcheng; Wang, Shiyu; Lu, Yu; Tang, Yiwen

doi:10.1039/c8ta06965d

Cited by 41 publications

(14 citation statements)

References 40 publications

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“…The electrochemical capacitive behaviors of the Co 3 O 4 nanomaterials were also investigated by CP tests. Figure 6c, d exhibited the CP curves of Co 3 O 4 nanocubes and nanosheets at various current density, which were acquired over a potential from 0 to 0.45 V. The appearance of distinct potential plateaus in all curves of the two sample demonstrated the pseudocapacitance characteristics, which was consistent with the conclusions obtained from CV curves [50]. According to Eq.…”

Section: Resultssupporting

confidence: 81%

Egg Albumin-Assisted Hydrothermal Synthesis of Co3O4 Quasi-Cubes as Superior Electrode Material for Supercapacitors with Excellent Performances

et al. 2019

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Novel Co3O4 quasi-cubes with layered structure were obtained via two-step synthetic procedures. The precursors were initially prepared via hydrothermal reaction in the presence of egg albumin, and then the precursors were directly annealed at 300 °C in air to be converted into pure Co3O4 powders. It was found that the size and morphology of final Co3O4 products were greatly influenced by the amount of egg albumin and hydrothermal durations, respectively. Such layered Co3O4 cubes possessed a mesoporous nature with a mean pore size of 5.58 nm and total specific surface area of 80.3 m2/g. A three-electrode system and 2 M of KOH aqueous electrolyte were employed to evaluate the electrochemical properties of these Co3O4 cubes. The results indicated that a specific capacitance of 754 F g−1 at 1 A g−1 was achieved. In addition, the Co3O4 cubes-modified electrode exhibited an excellent rate performance of 77% at 10 A g−1 and superior cycling durability with 86.7% capacitance retention during 4000 repeated charge-discharge process at 5 A g−1. Such high electrochemical performances suggest that these mesoporous Co3O4 quasi-cubes can serve as an important electrode material for the next-generation advanced supercapacitors in the future.

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Section: Resultssupporting

confidence: 81%

Egg Albumin-Assisted Hydrothermal Synthesis of Co3O4 Quasi-Cubes as Superior Electrode Material for Supercapacitors with Excellent Performances

et al. 2019

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“…78-1970) or Co 2 NiO 4 (JCPDS card no. 02-1074), , and the measured interplanar spacing of 0.21 nm could be indexed to the (200) planes of NiO (JCPDS card no. 47-1049) .…”

Section: Results and Discussionmentioning

confidence: 99%

“…02-1074), or the (200) planes of NiO (JCPDS card no. 47-1049), 7,30 as shown in Figure 2. This indicates the occurrence of a process of new Ni/ Co oxides such as Co 3 O 4 , Co 2 NiO 4 , or NiO with a lowcrystallinity phase separation from the NiCoBO x species after being annealed in air at high temperatures (about 300−400 °C).…”

Section: Introductionmentioning

confidence: 98%

Tuning Oxidation Degrees of Low-Crystallinity Porous Ni–Co–B–O/C Nanocomposites for High-Performance Hybrid Supercapacitors

Qiu

Kong

et al. 2020

Energy Fuels

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Boron-containing transition metal materials are new kinds of promising electrode materials for supercapacitors due to their good electrochemical activity, cost-effectiveness, and eco-friendliness. Here, through the oxidation of amorphous porous Ni− Co bimetallic borate nanosheets/C nanoaggregate precursor, a series of Ni−Co−B−O/C nanocomposites are fabricated. By adjusting the oxidation temperatures, the concentration of the oxidized-borate species near the surface was well-tuned. This results in creating different concentrations of the "electron-unsaturated" O atoms, which can accept extra electrons easily and promote the absorption/diffusion of electrolyte ions. Meanwhile, the hierarchically porous characteristic and low-crystallinity structure of the precursor are successfully maintained. Employed as an electrode, the optimized Ni−Co−B−O/C nanocomposite shows a specific capacity of 1139 C g −1 at 1 A g −1 and 83.5% capacitance retention after 2000 cycles. When assembled with reduced graphene oxide into a hybrid supercapacitor, a high energy density of 48.2 W h kg −1 at a power density of 429.8 W kg −1 , high rate capability, and excellent stability were achieved, indicating great application potential in energy storage applications.

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“…18 After the phosphating process, the surface of P-SnO 2 /CNFs becomes smoother and the particles in nanofiber become smaller, which could be due to the surface derivatization of nanofibers to an amorphous Pcontaining product. 19 From the selected area electron diffraction (SAED) images (inset of Figure 2c and Figure S1c) of P-SnO 2 /CNFs and SnO 2 /CNFs, no diffraction dots or rings are found. This suggests that both SnO 2 /CNFs and P-SnO 2 /CNFs are amorphous.…”

mentioning

confidence: 99%

“…Obviously, the surface of SnO 2 /CNFs is quite rough and there are many small particles on the surface of carbon nanofibers, which might be caused by the decomposition of metal precursor and removal of polymer composition (Figure S1). After the phosphating process, the surface of P-SnO 2 /CNFs becomes smoother and the particles in nanofiber become smaller, which could be due to the surface derivatization of nanofibers to an amorphous P-containing product . From the selected area electron diffraction (SAED) images (inset of Figure c and Figure S1c) of P-SnO 2 /CNFs and SnO 2 /CNFs, no diffraction dots or rings are found.…”

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confidence: 99%

Stable Rooted Solid Electrolyte Interphase for Lithium-Ion Batteries

Jiang

Liu

Wang

et al. 2021

J. Phys. Chem. Lett.

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Metal oxide-based materials are attractive anode candidates for lithium-ion batteries (LIBs) because of their high theoretical capacity. However, these materials suffer from large volume expansion and poor stability of solid electrolyte interphase (SEI) during the charge–discharge process, casusing rapid capacity degradation. Herein, we report that Li3PO4-rooted and intact SEI in situ formed on the phosphate-modified SnO2/CNFs during cycling. The phosphate anions in the anode, could serve as the root to form Li3PO4 by bonding with Li ions and participate in the formation of the SEI, thus firmly anchoring and stabilizing the SEI layer. The rooted Li3PO4 and enriched LiF in the SEI could synergistically enhance the Li-ion diffusion, significantly reduce the volume expansion, and lead to ultrastable cycling performance over 1100 charge–discharge cycles at 1 A g–1. This work provides a new avenue for forming stable SEI rooted into the anode and inspires the development of interface engineering toward electrochemical energy storage.

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Remarkable enhancement of the electrochemical properties of Co₃O₄ nanowire arrays by in situ surface derivatization of an amorphous phosphate shell

Abstract: It is a highly desirable but still a challenging task to find a simple, fast and straightforward method to greatly improve the electrochemical properties of a Co3O4 electrode for pseudocapacitors.

Cited by 41 publications

References 40 publications

Egg Albumin-Assisted Hydrothermal Synthesis of Co3O4 Quasi-Cubes as Superior Electrode Material for Supercapacitors with Excellent Performances

Egg Albumin-Assisted Hydrothermal Synthesis of Co3O4 Quasi-Cubes as Superior Electrode Material for Supercapacitors with Excellent Performances

Tuning Oxidation Degrees of Low-Crystallinity Porous Ni–Co–B–O/C Nanocomposites for High-Performance Hybrid Supercapacitors

Stable Rooted Solid Electrolyte Interphase for Lithium-Ion Batteries

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