ZIF-67 Derived Nanostructures of Co/CoO and Co@N-doped Graphitic Carbon as Counter Electrode for Highly Efficient Dye-sensitized Solar Cells

Jing, Hongyu; Song, Xuedan; Ren, Shan; Shi, Yantao; An, Yi; Yang, Ying; Feng, Mingqiao; Ma, Shengqian; Hao, Ce

doi:10.1016/j.electacta.2016.07.129

Cited by 97 publications

(41 citation statements)

References 39 publications

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“…In the case of Co 3 O 4 @C, SEM image confirms that the obtained N‐doped porous carbon lost original ZIF‐67 morphology (Figure E), with only a layer of N‐doped C coating on the surface of spinel Co 3 O 4 , which was confirmed by TEM image as well (Figure F). The resolved interplanar distances of ≈0.34 nm and ≈0.26 nm can be attributed to the porous C and spinel Co 3 O 4 (Figure F, inset image) . After phosphorization, the derived CoP retained dodecahedral shape of original ZIF‐67 (Figure S9, Supporting Information).…”

Section: Resultssupporting

confidence: 49%

“…The solved interplanar distance of ≈0.26 nm is consistent with (311) plane of Co 3 O 4 ( Figure 2D, inset image). [33,34] After phosphorization, the derived CoP retained dodecahedral shape of original ZIF-67 ( Figure S9, Supporting Information Figure 2J, inset image). The resolved interplanar distances of ≈0.34 nm and ≈0.26 nm can be attributed to the porous C and spinel Co 3 O 4 ( Figure 2F, inset image).…”

Section: Wileyonlinelibrarycommentioning

confidence: 98%

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MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

Zhou

Dou

Zhou

et al. 2017

Advanced Energy Materials

296

171

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transfer and sluggish kinetics process. [4][5][6] Although precious metals, such as Ir and Ru, as well as their oxides have been approved as efficient electrocatalysts for the OER, their high cost and scarcity undoubtedly prohibit the large-scale application in practice, to some extent. [5,6,7,8a] As a result, a great amount of efforts have been devoted to exploit earth-abundant metalsbased electrocatalysts, such as metal phosphates, oxides, hydroxides, chalcogenides, and nitrides for promoting the OER. However, the performance of explored catalysts is still discounted by their low conductivity and inadequate active surface area, resulting in high overpotential and limited kinetics in the OER. [9a,10b] Thus, to satisfy the requirement of efficient water splitting, the development of new materials and/or methodologies to exploit novel electrocatalysts with advantages of fast reaction rate, minimum overpotential, and long-term stability is one of current research hot topics in several research fields.Among resource-rich transition metalbased electrocatalysts, Co-based materials (e.g., Co, Co 3 O 4 , Co 8 S 9 , CoP, and CoN 4 ) have emerged as important candidates for the water splitting due to their low cost-efficiency, environmental benignity, and theoretically high catalytic activity. [11][12][13][14][15] Despite a great deal of efforts, the low intrinsic conductivity and easy self-agglomeration of these catalysts usually lead to a high overpotential and decreased reaction rate. Alternatively, the integration of Co-based materials and other electrocatalysts has been demonstrated to be able to enhance OER activity, however the poor compatibility between them in some composites is an obstacle to further optimize their efficiency. [16][17][18][19] Moreover, in some cases the active components are still not stable enough when being subjected to long time operation or accelerated degradation measurements under strong alkaline electrolytes, which also limits their application.Recently, it was demonstrated that deliberately designing well-defined 3D structures directly grown on the current collectors can endow electrocatalysts with superior water splitting performance, owing to the advantages of their fast electrolyte penetration, great electrical conductivity, and more exposed active sites. [20][21][22][23] It was noticed that Co-based metal-organic frameworks (MOFs) (as the template) derived materials with The ever-increasing demand for clean and renewable power sources has sparked intensive research on water splitting to produce hydrogen, in which the exploration of electrocatalysts is the central issue. Herein, a new strategy, metal-organic framework template-directed fabrication of hierarchically structured Co 3 O 4 @X (X = Co 3 O 4 , CoS, C, and CoP) electrocatalysts for efficient oxygen evolution reaction (OER) is developed, where Co 3 O 4 @X are derived from cobalt carbonatehydroxide@zeolitic-imidazolate-framework-67 (CCH@ZIF-67). Unique hierarchical structure and synergistic effect of resulting catalysts endo...

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Section: Resultssupporting

confidence: 49%

Section: Wileyonlinelibrarycommentioning

confidence: 98%

MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

Zhou

Dou

Zhou

et al. 2017

Advanced Energy Materials

296

171

View full text Add to dashboard Cite

show abstract

“…This result demonstrated the presence of heterojunction between CuO and Cu 2 O in CuO x nanorod surface . In addition, the HRTEM images marked at the shell part presented a interfinger distance of 0.203 nm, corresponding to (111) planes of CoO . It was worthy to notice that CoO particles were uniformly distributed in the total structure.…”

Section: Resultsmentioning

confidence: 69%

“…[18] In addition, the 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 HRTEM images marked at the shell part presented a interfinger distance of 0.203 nm, corresponding to (111) planes of CoO. [23] It was worthy to notice that CoO particles were uniformly distributed in the total structure. This particular distribution of metal center in derivatives was previously discovered by reported researches, which was beneficial to catalytic activity.…”

Section: Resultsmentioning

confidence: 98%

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam

Pan¹,

Wang²,

Cai³

et al. 2020

ChemCatChem

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The fabrication of cost‐effective and performance‐advanced electrocatalysts is in great requirements for water splitting to achieve sustainable oxygen production. A simple and effective precursor of ZIF‐67 particles mounted on Cu(OH)2 nanorods was induced by a template alignment method. After annealing, hierarchical CoO polyhedron‐decorated CuO/Cu2O (CuOx) nanorods on Cu foam (denoted as CuOx@CoO NRs/CF) were achieved, which displayed the heterojunction in CuOx components, hierarchical configuration and outward active sites. These features, verified by HRTEM, SEM, XPS and EDX, optimized the oxygen evolution reaction (OER) electrocatalyst. Benefiting from its large electrochemical surface area and the synergetic effect between CuOx and CoO, CuOx@CoO NRs/CF exhibited considerable catalytic activity with a low overpotential of 254 mV to obtain a current density of 10 mA cm−2 in alkaline electrolyte and a scarce loss of the initial catalyst activity over 24 h and over 5000 cycles. This work provides a channel to enhance the performance in OER.

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“…Owing to the characteristics of well-organized configuration, high specific surface area, and tailorable porosity, MOFs are considered to be an ideal sacrificial templates to synthesize the heteroatoms-doped carbon-based nanocatalysts. To date, an enormous of researches have concentrated on the preparation of MOFsderived hetero-atoms doped metal-carbon composites, and plentiful of MOFs have been employed for this target, such as ZIF-8 [100], ZIF-67 [101], Cu(BTC) 3 [102], and MOF-5 [103].…”

Section: Mofs Used As Sacrificial Templatesmentioning

confidence: 99%

The development of MOFs-based nanomaterials in heterogeneous organocatalysis

et al. 2018

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ZIF-67 Derived Nanostructures of Co/CoO and Co@N-doped Graphitic Carbon as Counter Electrode for Highly Efficient Dye-sensitized Solar Cells

Cited by 97 publications

References 39 publications

MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam

The development of MOFs-based nanomaterials in heterogeneous organocatalysis

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ZIF-67 Derived Nanostructures of Co/CoO and Co@N-doped Graphitic Carbon as Counter Electrode for Highly Efficient Dye-sensitized Solar Cells

Cited by 97 publications

References 39 publications

MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

MOF Template‐Directed Fabrication of Hierarchically Structured Electrocatalysts for Efficient Oxygen Evolution Reaction

Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuOx@CoO Nanorods Grown on Cu Foam

The development of MOFs-based nanomaterials in heterogeneous organocatalysis

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Self‐Supported Electrocatalysts for Efficient Oxygen Evolution Reaction: Hierarchical CuO_x@CoO Nanorods Grown on Cu Foam