Rapid oxygen diffusive lithium–oxygen batteries using a restacking-inhibited, free-standing graphene cathode film

Jung, In‐Sun; Kwon, Hyuk Jae; Kim, Mokwon; Kim, Doyoung; Kim, Jung-Hwa; Lee, Hyangsook; Yun, Dong‐Jin; Byun, Sunjung; Yu, Da-Eun; An, Hyeong-Geun; Jang, Jaeduck; Im, Dongmin; Lee, Hyoyoung

doi:10.1039/c9ta00320g

Cited by 15 publications

(8 citation statements)

References 42 publications

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“…Basically, nanosheets suffer from the restacking issue during thermal annealing, which will result in low surface area, thus active sites might be blocked . According to the SEM and TEM results, nanoparticles were in‐situ generated during thermal annealing, and these nanoparticles acted as pillars to support the adjacent nanosheets.…”

Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Zhang

et al. 2020

ChemSusChem

104

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H 2 production via electrocatalytic water splitting is greatly hindered by the sluggish oxygen evolution reaction (OER). The urea oxidation reaction (UOR) draws specific attention not only because of its lower theoretical voltage of 0.37 V compared with OER (1.23 V), but also for treating sewage water. Herein, Ni/NiO nanosheets with an ultrathin N-doped C layer containing a Schottky Ni and NiO heterointerface is constructed. Because of the self-driven charge redistribution at the heterointerface, janus charge domains are successfully created to drive the cleavage of urea molecules. Meanwhile, the synergistic effect between N-doped C and Ni/NiO restrains the deactivation of active sites in alkaline solution. The catalyst displays 1.35 V for UOR at 10 mA/cm 2 , 0.27 V lower than that of OER. The final potential increase is only 2 mV after long-term stability test of 12 h for UOR, much smaller than the uncoated sample (38 mV). The present work shows that C-coated transition metal nanomaterials with oxygen vacancies and a Schottky heterointerface are promising candidates for simultaneously boosting UOR with both high activity and long-term stability.

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Section: Resultsmentioning

confidence: 99%

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Zhang

et al. 2020

ChemSusChem

104

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“…The cyclic voltammetry (CV) curves under high pure O 2 (Figure 2a) was measured from 2 to 4.5 V versus Li/Li + at a scan rate of 0.2 mV s −1 , which reveal that there are two peaks for both 3DHG-Mo/Mo 2 C-800 and 3DHG-Mo 2 C-900 cathodes, and they are totally different from the 3DHG-Mo-700 and 3DHG sample. 32 Simultaneously, the ORR peaks of 3DHG-Mo/Mo 2 C-800 are similar to those of 3DHG-Mo 2 C-900. Notably, the onset potential of 3DHG-Mo/Mo 2 C-800 is about 2.67 V, which is higher than that of 3DHG-Mo 2 C-900 (about 2.65 V) and 3DHG-Mo-700 (2.44 V).…”

Section: Electrochemical Properties In Lobsmentioning

confidence: 64%

“…To investigate the electrochemical properties of all the hybrids, the samples and PVDF were mixed in a ratio of 9:1 and rolled as the cathodes to assemble into 2032-type batteries for electrochemical tests. The cyclic voltammetry (CV) curves under high pure O 2 (Figure a) was measured from 2 to 4.5 V versus Li/Li + at a scan rate of 0.2 mV s –1 , which reveal that there are two peaks for both 3DHG-Mo/Mo 2 C-800 and 3DHG-Mo 2 C-900 cathodes, and they are totally different from the 3DHG-Mo-700 and 3DHG sample . Simultaneously, the ORR peaks of 3DHG-Mo/Mo 2 C-800 are similar to those of 3DHG-Mo 2 C-900.…”

Section: Resultsmentioning

confidence: 87%

“…Noteworthy, the battery with the cathode with 3DHG-Mo/Mo 2 C-800 exhibits superior current rate performances (∼360 cycles). To better illustrate the superiority of the 3DHG-Mo/Mo 2 C-800 cathode, a comparison between the cycling performances and overpotential of our cathode and those main Mo–C cathodes reported so far are presented in Figure g, ,,,,− wherein the 3DHG-Mo/Mo 2 C-800 cathode has the longest cycle life (∼360 cycles) accompanied with a very low overpotential (∼0.52 V).…”

Section: Resultsmentioning

confidence: 97%

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Heterojunction-Composited Architecture for Li–O₂ Batteries with Low Overpotential and Long-Term Cyclability

Wang

Sun

et al. 2020

ACS Appl. Energy Mater.

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The crucial issue among lithium−oxygen batteries (LOBs) lies in the development of highly efficient catalysts to improve their large discharge−charge polarization, poor rate capability, and short cycle life. Herein, a composite of three-dimensional honeycomb graphenesupported a Mo/Mo2C heterojunction has been synthesized and can be utilized as a self-supported LOB cathode directly. The LOBs based on the Mo/Mo2C heterojunction composite cathode show a low overpotential of 0.52 V, a high discharge capacity of about 12016 mAh g−1 at 100 mA g−1, and a long-term cyclability (about 360 cycles) under a restricted capacity of 1000 mAh g−1 at 100 mA g−1, which exceeds the features of the majority of Mo-based catalysts for LOBs reported so far. Based on both experimental tests and density functional calculations, it is confirmed that the outstanding electrochemical performance is closely associated with a hierarchical porous structure for convenient oxygen/electrolyte diffusion, a large number of activity sites (interfaces/defects) for high capacity, and a high conductivity with metallic bonds for good rate capability. The method can be extended to prepare other metal based heterojunctions.

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“…Researchers use different thin‐film and chemical bath deposition techniques to fabricate flexible electrodes for battery applications. Materials with high electrical conductivity and large surface area such as graphene, carbon nanotubes (CNTs), carbon microfibers, carbon black, activated carbons from plants, and conductive polymers have been used in battery applications. Among these, CNTs are promising components of electroactive composites.…”

Section: Introductionmentioning

confidence: 99%

Development of printable, flexible nickel‐iron batteries based on composite electrodes

et al. 2019

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We present flexible nickel-iron batteries with printable multiwalled carbon nanotube (MWCNTs) based electrodes. All the metal composites are prepared via a single-step precipitation reaction to synthesize metal hydroxides on the MWCNTs. High loading of the conductive materials enhances reactivity. Compared with Ni(OH) 2 -CNT, β-NiOOH increases output energy due to higher discharge voltage in flexible cells. Cyclic voltammogram shows that the iron electrode underwent a two-step redox reaction among Fe, Fe(II), and Fe(III).The flexible Ni-Fe battery has higher charge-discharge efficiency when using 6 M KOH electrolyte saturated with LiOH, and with 5% Co(NO 3 ) 2 added to anode. The anode exhibits a specific capacity of more than 300 mAh g −1 . All the components and the flexible cells themselves show good performance under bending conditions and the fabrication methods are also suitable for scale-up via printing techniques. K E Y W O R D Scarbon nanotube, flexible nickel-iron battery, printable battery

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Rapid oxygen diffusive lithium–oxygen batteries using a restacking-inhibited, free-standing graphene cathode film

Abstract: The rapid oxygen diffusion of corrugated 2D graphene sheets enhances the capacity and cycle life of lithium air batteries.

Cited by 15 publications

References 42 publications

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Heterojunction-Composited Architecture for Li–O₂ Batteries with Low Overpotential and Long-Term Cyclability

Development of printable, flexible nickel‐iron batteries based on composite electrodes

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Rapid oxygen diffusive lithium–oxygen batteries using a restacking-inhibited, free-standing graphene cathode film

Abstract: The rapid oxygen diffusion of corrugated 2D graphene sheets enhances the capacity and cycle life of lithium air batteries.

Cited by 15 publications

References 42 publications

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Oxygen Vacancy‐rich Ni/NiO@NC Nanosheets with Schottky Heterointerface for Efficient Urea Oxidation Reaction

Heterojunction-Composited Architecture for Li–O2 Batteries with Low Overpotential and Long-Term Cyclability

Development of printable, flexible nickel‐iron batteries based on composite electrodes

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Heterojunction-Composited Architecture for Li–O₂ Batteries with Low Overpotential and Long-Term Cyclability