Study of the Active Sites in Porous Nickel Oxide Nanosheets by Manganese Modulation for Enhanced Oxygen Evolution Catalysis

Tian, Tian; Gao, Hong; Zhou, Xichen; Zheng, Lirong; Wu, Jianfeng; Li, Kai; Ding, Yong

doi:10.1021/acsenergylett.8b01206

Cited by 145 publications

(88 citation statements)

References 60 publications

(102 reference statements)

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“…Faradaic efficiency test was performed to further prove that the observed current densities originate from water oxidation rather than side reactions . The generated O 2 by CuO x @CoO NRs/CF at a constant oxidative current of 80 mA was directly measured by drainage method (the H 2 generated from graphite electrode in three‐electrode system), as shown in Figure S14.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…A current density of 10 mA cm −2 with only 240 mV overpotential and ∼80 mA cm −2 at 1.5 V for 0.1Fe−CoNiO/NF, which is better than many of reported OER electrocatalysts (Table S2). Tafel slopes are illustrated in Figure c, showing a slope of 36.8 mV dec −1 for 0.1Fe−CoNiO/NF, which is much smaller than Ni foam (91.8 mV dec −1 ), CoNiO (84.6 mV dec −1 ), Fe−Ni(OH) 2 /NF is (51.5 mV dec −1 ), as well as the benchmark catalysts including Ni−Fe LDH hollow nanostructures (49.4 mV dec −1 ), Ni−Co−P hollow nanobricks (46 mV dec −1 ), Fe‐doped NiPS 3 nanosheets (46 mV dec −1 ), CoP@Ti 3 C 2 −MXene (51 mV dec −1 ) and ultrathin Co 3 O 4 nanomeshes (76 mV dec −1 ), and most of reported OER electrocatalysts (Table S1). The smaller Tafel slopes indicating an excellent kinetic performance.…”

Section: Figurementioning

confidence: 99%

FeCoNi Ternary Spinel Oxides Nanosheets as High Performance Water Oxidation Electrocatalyst

Kong

Bai

et al. 2020

ChemCatChem

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FeCoNi spinel oxides nanosheets array directly supported on the Ni foam substrate were prepared via a facile wet chemical method with 2-methylimidazole as a structure directing agent and subsequently annealing. The as-prepared 0.1FeÀ CoNiO/NF offers high intrinsic catalytic activity, high surface area and good conductivity, resulting in enhanced activity for the oxygen evolution reaction (OER) in the alkaline solution. It demonstrates an ultralow overpotentials of 240 mV at 10 mA cm À 2 and a small Tafel slope of 36.8 mV dec À 1 , with attractive durability during long-term operation in 1 M KOH solution.Hydrogen is one of clean energy with irreplaceable advantages over energy sources such as wind and nuclear power. [1] Natural gas reforming is the main approach to produce hydrogen. However, natural gas reforming needs external energy input and release CO 2 as by-product, [2] never mind that the produced H 2 from this cost more energy for the further purifications process. In contrast, Photo/electrocatalytic water splitting has the advantage of effectively producing high purity hydrogen, but it is also suffering from many drawbacks such as high overpotential and low efficiency. [3] Oxygen evolution reaction (OER) with a four-electron transfer process is a half reaction for overall water splitting, which is more complicated and kinetically sluggish. [4] So far, noble metal like iridium (Ir), ruthenium (Ru) and their compounds were realized as efficient water oxidation catalysts. [5] However, the scarce and high cost of these materials limit their large-scale commercial applications. Thus it is urgent to prepare high-performance OER catalysts based on less noble elements.Among various low-cost OER catalysts, one promising candidate is spinel-structured oxides, due to its outstanding electrocatalysis performance and corrosion resistance in alkaline environment. [6] Typically, Co 3 O 4 has triggered considerable interest due to its earth abundance and easy to prepare. However, limited by low catalytic activity and poor electrical conductivity, Co 3 O 4 still presents high OER overpotentials. [7] In this regard, a number of strategies have been developed to solve these issues. Highly conductive substrates (such as graphite, single-walled carbon nanotubes and metal foam) are employed to improve the conductivity and increase the number of active sites of the catalyst. [8] Another option is to improve water oxidation through the modulation of electronic structures by doping. [9] It has been found that Ni has good interaction strength with OH ads , satisfying the Sabatier principle for catalyst design. [10] As a result, NiCo-based spinel oxides has gained considerable interest due to its excellent electrochemical activity. [11] Further, Fe-doping has been demonstrated as an effectively approach to improve the charge transport between the catalyst and the electrolytes. [12] On the hand, microstructure control has been employed to optimize the catalysis performance. [9] For instance, Co 3 O 4 crystals with different morpholo...

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“…Furthermore, N‐doped sites provide confined space for the metal single atoms by regulating the porous channels of the carbon material. Compared to other heteroatom‐doped carbon materials, metal oxides, metal carbides, metal nitrides, etc. NPC nanomaterials are abundant, facile to prepare, and suitable for large‐scale preparation and practical electrocatalytic applications.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen‐Doped Porous Carbon Supported Nonprecious Metal Single‐Atom Electrocatalysts: from Synthesis to Application

et al. 2019

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Nonprecious metal single‐atom materials have attracted extensive attention in the field of electrocatalysis due to their low cost, high reactivity, high selectivity, and high atomic utilization. However, the high surface energy of a single atom causes agglomeration during preparation and catalytic measurement, resulting in damage to the catalytic sites. The strong interaction between substrate and monoatoms is the key factor to prevent the aggregation of individual metal atoms, and the geometry and electronic structure of the catalysts can be adjusted to optimize the catalytic activity. Due to the hierarchically pores, high specific surface area, and defect effect, nitrogen‐doped porous carbon (NPC) has been widely studied as an ideal nonprecious metal single‐atom support, which synergistically enhance the electrocatalytic performance toward oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, carbon dioxide reduction reaction, and nitrogen reduction reaction with non‐noble metal single atoms. This review summarizes the controllable synthesis, characterization, theoretical calculation, and application of M (M = Co, Fe, Ni, Cu, Zn, Mo, etc.) single atoms on nitrogen‐doped porous carbon. Finally, the future development and challenges of nitrogen‐doped porous carbon supported nonprecious metal single‐atom electrocatalysts for practical commercialization are concluded.

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Study of the Active Sites in Porous Nickel Oxide Nanosheets by Manganese Modulation for Enhanced Oxygen Evolution Catalysis

Cited by 145 publications

References 60 publications

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

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

FeCoNi Ternary Spinel Oxides Nanosheets as High Performance Water Oxidation Electrocatalyst

Nitrogen‐Doped Porous Carbon Supported Nonprecious Metal Single‐Atom Electrocatalysts: from Synthesis to Application

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Study of the Active Sites in Porous Nickel Oxide Nanosheets by Manganese Modulation for Enhanced Oxygen Evolution Catalysis

Cited by 145 publications

References 60 publications

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

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

FeCoNi Ternary Spinel Oxides Nanosheets as High Performance Water Oxidation Electrocatalyst

Nitrogen‐Doped Porous Carbon Supported Nonprecious Metal Single‐Atom Electrocatalysts: from Synthesis to Application

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

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