Multilayer hollow MnCo2O4 microsphere with oxygen vacancies as efficient electrocatalyst for oxygen evolution reaction

Zeng, Kai; Wei, Li; Zhou, Yu; Sun, Zhihui; Lu, Chengyi; Jin, Yan; Choi, Jin‐Ho; Yang, Ruizhi

doi:10.1016/j.cej.2020.127831

Cited by 114 publications

(45 citation statements)

References 43 publications

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“…In addition, bimetallic oxides MnCo 2 O 4 (ref. 22) and CoFe 2 O 4 , 23 and ternary oxide Mn 0.6 Zn 0.4 Co 2 O 4 (ref. 24) have also been demonstrated to be highly active OER electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Duan

Wang

et al. 2022

Sustainable Energy Fuels

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Section: Introductionmentioning

confidence: 99%

Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Duan

Wang

et al. 2022

Sustainable Energy Fuels

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“…As discussed above, vacancy defects can modify the electronic structure of metal oxides, thereby increasing the electrical conductivity. [40][41][42] The C 1s spectra can be divided into three peaks at 284.8 eV, 286.1 eV, and 288.1 eV, which can be attributed to CÀ C with adventitious carbon or defect, CÀ O on the g-C 3 N 4 surface, and sp 2 -bonded N=CÀ N (Figure 2e), respectively. [43,44] It can be seen from Figure 2f, the N 1s spectra can be deconvoluted into four peaks at 398.5 eV, 399.2 eV, 399.9 eV, and 400.9 eV.…”

Section: Resultsmentioning

confidence: 99%

Doping and Vacancy Engineering in a Sandwich‐like g‐C₃N₄/NiCo₂O₄ Heterostructure for Robust Oxygen Evolution

et al. 2022

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Herein, N doping and O vacancy were simultaneously introduced into a g-C 3 N 4 /NiCo 2 O 4 heterostructure by a simple reflux and calcination strategy. The constructed g-C 3 N 4 displayed a porous lamellar structure with N-doped carbon. Furthermore, numerous ultrathin NiCo 2 O 4 nanosheets with abundant O vacancies tend to grow vertically on the porous g-C 3 N 4 lamellar, forming a sandwich-like heterostructure. The prepared sandwich-like g-C 3 N 4 /NiCo 2 O 4 heterostructure exhibited excellent oxygen evolution reduction (OER) activity with a low overpotential of 294 mV at 10 mA cm À 2 .Meanwhile, the heterostructure presented superior long-term stability, retaining a current density of 97.9% after a 50 h chronoamperometry test. The outstanding OER performance is ascribed to the synergistic effect of doping and vacancy engineering in the catalyst, the strong coupling interaction between g-C 3 N 4 and NiCo 2 O 4 , and the porous sandwich-like structure with abundant active sites. Therefore, the synthetic strategy of g-C 3 N 4 /NiCo 2 O 4 heterostructure can be extended to fabricate high-performance noble metal-free electrocatalysts for water splitting.

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“…Other oxygen‐deficient MOs including Co 3 O 4 , [ 131 ] α‐Fe 2 O 3 , [ 132 ] BiVO 4 /TiO 2 , [ 133 ] SnO 2 , [ 134 ] MnCo 2 O 4 , [ 135 ] SnTiO, [ 136 ] NiCo 2 O 4 , [ 137 ] LaCoO 3 , [ 138 ] MnO 2 , [ 139 ] and Bi 2 MoO 6 , [ 140 ] can also be produced by plasma treatment.…”

Section: Synthetic Approaches Of Oxygen‐deficient Mosmentioning

confidence: 99%

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

Wan

Wang

et al. 2022

Adv Energy and Sustain Res

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Supercapacitors (SCs) have attracted considerable research interest because of their complementary role to dominated lithium-ion batteries (LIBs) for powering the electrified society. [1] In contrast to the bulk-involved reactions for energy storage in LIBs, SCs mainly store charges in the electric double layers (EDLs) via electrostatic adsorption where highly porous and conductive materials, for example, activated carbons, are needed. [2] This storage mechanism allows SCs to exhibit excellent rate capability, long cyclic life, and high safety; therefore, it is indispensable in many fields. [3] However, despite these advantages, the limited charge storage space within electrode materials considerably restricts the energy density of SCs. To overcome this limitation, tremendous efforts have been devoted to the search for electrode materials that employ alternative charge-storage mechanisms that can improve energy storage. [4] Some metal oxides (MOs) can afford extremely fast surface redox reactions which compare favorably with those of electrostatic charge adsorption at the EDLs. Although these processes are faradaic in nature, they show an excellent rate capability that is similar to that of the EDL charge storage in the porous carbon electrodes of current SCs. Then, these MOs are defined as pseudocapacitive materials, and they can improve the energy density of current SCs. [5] The theoretical capacitance of the MO-based electrodes can be calculated using Equation (1) [6] Cwhere n, F, M, and V represent the number of transferred electrons, Faraday constant (C mol À1 ), the molar mass of the MOs (g mol À1 ), and operating voltage window (V), respectively. The specific capacitance of the typical MO electrode materials is summarized in Table 1.The MOs should have suitable electronic structures, desired electrical conductivity, and sufficient active sites to facilitate surface redox reactions. To this end, tremendous progress has been realized via research efforts in recent decades. [7] Heteroatomdoping has been widely used to engineer electronic structures. [8] Zeng et al. [9] synthesized a Ti-doped Fe 2 O 3 @poly

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Multilayer hollow MnCo2O4 microsphere with oxygen vacancies as efficient electrocatalyst for oxygen evolution reaction

Cited by 114 publications

References 43 publications

Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Doping and Vacancy Engineering in a Sandwich‐like g‐C₃N₄/NiCo₂O₄ Heterostructure for Robust Oxygen Evolution

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

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Multilayer hollow MnCo2O4 microsphere with oxygen vacancies as efficient electrocatalyst for oxygen evolution reaction

Cited by 114 publications

References 43 publications

Nanosized high entropy spinel oxide (FeCoNiCrMn)3O4 as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Nanosized high entropy spinel oxide (FeCoNiCrMn)3O4 as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Doping and Vacancy Engineering in a Sandwich‐like g‐C3N4/NiCo2O4 Heterostructure for Robust Oxygen Evolution

Oxygen‐Deficient Metal Oxides for Supercapacitive Energy Storage: From Theoretical Calculation to Structural Regulation and Utilization

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Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Nanosized high entropy spinel oxide (FeCoNiCrMn)₃O₄ as a highly active and ultra-stable electrocatalyst for the oxygen evolution reaction

Doping and Vacancy Engineering in a Sandwich‐like g‐C₃N₄/NiCo₂O₄ Heterostructure for Robust Oxygen Evolution