Bi/BiFe(oxy)hydroxide for sustainable lattice oxygen-boosted electrocatalysis at a practical high current density

Jo, Seunghwan; Park, Woon Bae; Lee, Keon Beom; Choi, Hyeongguen; Lee, Kug‐Seung; Ahn, Docheon; Lee, Young-Woo; Sohn, Kee‐Sun; Hong, John; Sohn, Jung Inn

doi:10.1016/j.apcatb.2022.121685

Cited by 12 publications

(3 citation statements)

References 52 publications

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“…The valence states of BiFeO 3 and BiFeO 3-X were determined via XPS analysis (Figure 2 and Supplementary Materials, Figure S5). In the Bi 4f region (Figure 2(d)), Bi 3+ (159.0 and 164.5 eV), although dominant in BiFeO 3 , occurred at a significantly lower concentration than elemental bismuth (Bi 0 : 158.0 and 163.0 eV) in BiFeO 3-X , owing to the oxygen deficiency [24][25][26]. Similarly, the elemental iron (Fe 0 ) peak occurred at binding energies of approximately 709.0 and 721.9 eV in BiFeO 3-X .…”

Section: Resultsmentioning

confidence: 99%

Enhancing the Electrochemical Energy Storage Performance of Bismuth Ferrite Supercapacitor Electrodes via Simply Induced Anion Vacancies

Pak

Lee

et al. 2023

International Journal of Energy Research

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Increasing the content of anion vacancies may yield significant improvement in the overall electrochemical energy-storing performance of perovskite materials, where the vacancy sites act as highly favorable ion diffusion paths. However, a detailed study on energy storage mechanism at binary cation sites under the anion deficiency should be further explored in supercapacitor electrode materials. In this study, a simple hydrothermal method and hydrogen gas exposure processes were used to generate oxygen vacancies in the crystal of BiFeO3 (BiFeO3-X) to enhance the overall electrochemical properties. At a current density of 1 A g−1, the BiFeO3-X supercapacitor electrode exhibits a large specific capacitance (461.9 F g−1, 923.8 mF cm-2, and 145.3 mAh g-1) and a high cycling stability (94.4%) after 2,000 cycles. Electrochemical analysis reveals that the oxygen vacancy sites can further increase the electrochemical activity of Bi sites, which is mostly suppressed in the pure crystal lattice, resulting in synergistic energy storage behavior of binary cation sites.

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Section: Resultsmentioning

confidence: 99%

Enhancing the Electrochemical Energy Storage Performance of Bismuth Ferrite Supercapacitor Electrodes via Simply Induced Anion Vacancies

Pak

Lee

et al. 2023

International Journal of Energy Research

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“…However, the OER at the anode involves four electron transfers, which is a complex multi-step and inherently slow kinetic process. [17][18][19][20] During the OER, oxygen molecules are produced by multiple electron/proton coupling processes, and the reaction is highly dependent on the pH value. The half-cell reaction of the OER can occur in alkaline media following: 4OH − ↔ 2H 2 O + O 2 + 4e − , and in acidic media following: 2H 2 O ↔ 4H + + O 2 + 4e − .…”

Section: Introductionmentioning

confidence: 99%

Recent progress of manganese dioxide based electrocatalysts for the oxygen evolution reaction

He,

Kang,

et al. 2023

Ind. Chem. Mater.

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“…[24] In addition to transition metal-based catalysts, heavy main group metalbased catalysts (HMGMCs), i.e., catalysts with a metal active center, have also gained increasing attention in catalyzing the OER. [25][26][27] Main group heavy metals have a large number of electron layers, and the extranuclear electrons have a strong positive shielding effect on the nucleus. As a result, the p-band electrons of the valence layer are easily lost, causing the metal active center to reach a high valence state and thus providing a unique advantage for the catalysis of redox reactions.…”

Section: Introductionmentioning

confidence: 99%

Tracing the Effects of Nitrogen Doping and Sulfur Vacancy in Surging OER Electrocatalytic Activity of Bismuth Sulfide Nanorods

Zhang

Wang

et al. 2023

Advanced Sustainable Systems

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Bismuth sulfide has become an attractive candidate in the electrocatalytic oxygen evolution reaction (OER), owing to its open coordination sites, unpaired electron orbitals, and mild electronegativity, but its OER performance is hindered by many deficiencies. The combination of heteroatom construction and vacancy engineering has been used to improve the OER performance of bismuth‐based electrocatalysts, but few studies can clearly describe the roles of dopants and vacancies in improving OER performance. Herein, N dopants and S vacancies in Bi2S3 nanorods via one‐step NH3/Ar plasma etching to investigate the enhanced OER performance are constructed. N dopants and S vacancies both regulated the intrinsic charge ordering of Bi2S3 nanorods, enhancing the p‐band center and Fermi level while also boosting the electroconductivity and wettability of the material. In addition, density functional theory calculations suggest that N doping promoted the adsorption of Bi sites, while S vacancies favored the desorption of S sites. Under the synergistic effects of N dopants and S vacancies, Bi2S3‐based electrocatalysts exhibited a low overpotential of 374 mV at 10 mA cm−2 and satisfactory durability, demonstrating a feasible strategy for exploiting main group element OER electrocatalysts.

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Bi/BiFe(oxy)hydroxide for sustainable lattice oxygen-boosted electrocatalysis at a practical high current density

Cited by 12 publications

References 52 publications

Enhancing the Electrochemical Energy Storage Performance of Bismuth Ferrite Supercapacitor Electrodes via Simply Induced Anion Vacancies

Enhancing the Electrochemical Energy Storage Performance of Bismuth Ferrite Supercapacitor Electrodes via Simply Induced Anion Vacancies

Recent progress of manganese dioxide based electrocatalysts for the oxygen evolution reaction

Tracing the Effects of Nitrogen Doping and Sulfur Vacancy in Surging OER Electrocatalytic Activity of Bismuth Sulfide Nanorods

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