An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

Guo, Jian; Gadipelli, Srinivas; Yang, Yuchen; Li, Zhuangnan; Lu, Yue; Brett, Dan J. L.; Guo, Zhengxiao

doi:10.1039/c8ta10925g

Cited by 129 publications

(76 citation statements)

References 66 publications

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“…Such structures partly inherit the original structural attributes of MOFs and can gain substantial electrical conductivity, stability and chemical selectivity by post-treatment process (e.g., annealing). [55][56][57] From the next section, the strategies for synthesizing structure/chemistrytailored MOF-based materials will be discussed in detail.…”

Section: Significance Of Pores For Eesmentioning

confidence: 99%

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Yang

et al. 2021

Advanced Energy Materials

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101

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energy storage (EES)-primarily supercapacitors and metal-ion batteries (MIBs, e.g., lithium-ion batteries (LIBs), sodiumion batteries (SIBs), and potassium-ion batteries (PIBs)).Both supercapacitors and batteries typically consist of current collectors, electrodes, electrolyte, and a separator. By applying a suitable potential between current collectors, the charge/discharge process takes place mediated by the electrode materials, and the electrolyte ions (i.e., the charge carriers) are accordingly driven to travel across the separator so as to connect the circuit. In recent years, solidstate electrolytes (SSEs) are also under popular development to enhance cell voltage (energy density) and safety of the devices. [1] Upon charging, electrical energy is converted to electrostatic potential for supercapacitors and to chemical energy for batteries, and vice versa. Therefore, each device has pros and cons. Supercapacitors usually provide a high power density (i.e., a fast charge/ discharge velocity) due to the fast physical charge-discharge process across the interfaces between electrode materials and the electrolyte solutions, while the energy density is usually small (≈5 Wh kg −1 ). In comparison, batteries often offer a large energy density (i.e., a large specific energy capacity of ≈200 Wh kg −1 ) attributed to the chemical redox reactions which take place throughout the whole volume of electrode materials, while the operation rate is relatively slow. [2] To construct desirable energy storage devices, porous materials have been widely adopted, particularly for electrodes and SSEs. These materials typically feature a large fraction of interconnected or reticulated porosity with a high specific surface area (SSA), offering numerous potential active sites and mass transfer channels. For example, porous materials based on nanocarbons (e.g., carbon nanotubes, graphene), conducting polymers, and conjugated microporous polymers with high electrical conductivity and large SSAs have been frequently adopted for supercapacitors, [3] while porous carbons, MoS 2 , and metal oxides have been used for LIBs because of the theoretically large stoichiometric lithium content in the respectively lithiated compound and an accelerated Li diffusion rate inside the pores. [4][5][6] Despite considerable progress made so far, these porous materials fall short of sufficiently large SSAs and readily tunable pores, which constrain the upper limit for the performance optimization and affect an accurate investigation of the structure-performance relationship.Metal-organic frameworks (MOFs) feature rich chemistry, ordered micro-/ mesoporous structure and uniformly distributed active sites, offering great scope for electrochemical energy storage (EES) applications. Given the particular importance of porosity for charge transport and catalysis, a critical assessment of its design, formation, and engineering is needed for the development and optimization of EES devices. Such efforts can be realized via the design of reticular chemistry, multiscale...

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Section: Significance Of Pores For Eesmentioning

confidence: 99%

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Yang

et al. 2021

Advanced Energy Materials

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101

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“…In addition, cobalt nitrate hexahydrate was reduced to elemental cobalt aer a high temperature treatment at 900 C, and the standard peaks of cobalt appeared at 44.32 , 52.12 , and 76.20 , corresponding to (111), (200), and (220) crystal planes, respectively. 41 Compared with the standard map (PDF89-4307), 42 it is a-Co with a face-centered cubic structure and formed on the surface of CNTs aer hightemperature treatment. With increasing hydrothermal temperature, the diffraction peak of Co becomes narrower, and the intensity gradually increases.…”

Section: Resultsmentioning

confidence: 99%

Cobalt and nitrogen codoped carbon nanotubes derived from a graphitic C₃N₄ template as an electrocatalyst for the oxygen reduction reaction

Zhang

et al. 2020

Nanoscale Adv.

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“…The arrangement of periodic lattice fringes with a d-spacing of 0.21, 0.204, and 0.21 nm correspond to the (111) planes of metallic Co, Ni and Fe nanoparticles, respectively (Figure 2c, 2e, 2 g). [6,14,15] In general, the TM nanoparticles or MÀ N x B/C species are surrounded by 10 to 15 nm thick graphitic layers. XPS was performed to investigate the chemical bonding and the electronic interaction of the TM with Scheme 1.…”

Section: Physicochemical Catalysts Characterizationsmentioning

confidence: 99%

“…[3,4] When integrated in a graphitic carbon matrix such as carbon nanotubes or nanosheets typically via high-temperature pyrolysis methods the transition metals (TM) or their oxides (TMO) often exhibit high performance for bifunctional ORR/OER electrocatalytic stability and activity. [5,6] Most synthetic routes lead to nanoparticle agglomeration and the density of catalytic active sites often decreases drastically during electrocatalysis with a concomitant decline in activity. Sometimes, harsh conditions such as acid washing are employed to dissolve excess metal particles or to introduce porosity.…”

Section: Introductionmentioning

confidence: 99%

Trace Metal Loading of B‐N‐Co‐doped Graphitic Carbon for Active and Stable Bifunctional Oxygen Reduction and Oxygen Evolution Electrocatalysts

et al. 2021

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Understanding the structure-property relations of non-precious metal heteroatom co-doped carbon electrocatalysts exhibiting high activity as well as long-term durability for both ORR and OER remains challenging but is indispensable for the development of bifunctional ORR/OER electrocatalysts. We propose B-N-co-doped graphitic 2D carbon nanostructures impregnated with controlled amount of transition metals (M-BCN; M=Co, Ni, Fe, Cu) as bifunctional ORR/OER electrocatalysts. Co-BCN outperformed the Ni-, Fe-, Cu-based BCN catalysts exhibiting potential values of 0.87 V and 1.62 V at À 1 mA/cm 2 and 10 mA/ cm 2 during ORR and OER, respectively. Importantly, Co-BCN shows bifunctional cyclic stability (Δη; E OER À E ORR = 0.75 V) of up to 300 cycles in 1 M KOH for a duration of 20 h with total activity loss of only 10.2 % (ORR) and 6.2 % (OER), respectively. A low loading of the metal precursors was used to preserve porosity and to facilitate the formation of metal nanoparticles or MÀ N x B/C type species embedded in the graphitic carbon layers. The B-N-co-doped graphitic layers also protect the embedded metal nanoparticles explaining the observed longterm stability.

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An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

Abstract: Low-temperature etching of ZIF-67 is proposed for ultra-small cobalt/cobalt-oxide nanoparticles in nitrogen-doped graphene-networks as an efficient electrocatalyst for the oxygen reduction reaction.

Cited by 129 publications

References 66 publications

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Cobalt and nitrogen codoped carbon nanotubes derived from a graphitic C₃N₄ template as an electrocatalyst for the oxygen reduction reaction

Trace Metal Loading of B‐N‐Co‐doped Graphitic Carbon for Active and Stable Bifunctional Oxygen Reduction and Oxygen Evolution Electrocatalysts

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An efficient carbon-based ORR catalyst from low-temperature etching of ZIF-67 with ultra-small cobalt nanoparticles and high yield

Abstract: Low-temperature etching of ZIF-67 is proposed for ultra-small cobalt/cobalt-oxide nanoparticles in nitrogen-doped graphene-networks as an efficient electrocatalyst for the oxygen reduction reaction.

Cited by 129 publications

References 66 publications

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Porosity Engineering of MOF‐Based Materials for Electrochemical Energy Storage

Cobalt and nitrogen codoped carbon nanotubes derived from a graphitic C3N4 template as an electrocatalyst for the oxygen reduction reaction

Trace Metal Loading of B‐N‐Co‐doped Graphitic Carbon for Active and Stable Bifunctional Oxygen Reduction and Oxygen Evolution Electrocatalysts

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Cobalt and nitrogen codoped carbon nanotubes derived from a graphitic C₃N₄ template as an electrocatalyst for the oxygen reduction reaction