CoMn2O4 Spinel Nanoparticles Grown on Graphene as Bifunctional Catalyst for Lithium-Air Batteries

Wang, Long; Zhao, Xin; Lu, Yuhao; Xu, Maowen; Zhang, Dawei; Ruoff, Rodney S.; Stevenson, Keith J.; Goodenough, John B

doi:10.1149/2.068112jes

Cited by 227 publications

(199 citation statements)

References 29 publications

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“…Figure 1 shows the loss percentage of weight and derivative weight loss profile of the dried catalyst precursor (carbonate) under a 2 % O 2 /Ar flow, from this profile it can be seen that the weight loss happens in three events at 499, 716 and 1152 K. The weight loss is 40 % of total weight of the catalyst during calcination. The loss at 499 K is endothermic and can be assigned to the loss of adsorbed water, the second weight loss (*22 %) at 716 K can be assigned tothe decomposition of a carbonate [28]. From the mass loss we assign this to magnesium carbonate to give (Co,Mn)(Co,Mn) 2 O 4 /MgO (this is in keeping with the XRD patterns shown in Fig.…”

Section: Resultssupporting

confidence: 64%

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Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Muneam

Hadi²,

Kareem³

et al. 2016

Int J Ind Chem

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A (Co,Mn)(Co,Mn) 2 O 4 /MgO catalyst was prepared by simple co-precipitation from an aqueous solution of the mixed metal salts using sodium carbonate. The calcination of the precipitate was characterized by TGA and XRD showing the generation of (Co,Mn)(Co,Mn) 2 O 4 /MgO by 773 K. The catalyst had a surface area of 45 m 2 g -1 in the fully calcined state (873 K) and was characterized by XRD and TGA. Characterization by TPR of the catalyst calcined at different temperatures revealed an annealing process that lowered the surface energy of the catalyst thereby inhibiting reduction. The calcined catalyst was active for the dehydrogenation of isopropanol to acetone and propene with the peak reaction temperature *428 K and a second reaction zone around 613 K related to strongly bound alcohol. Lattice oxygen was reactive from 463 K converting adsorbed alcohol into carbon dioxide.

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Section: Resultssupporting

confidence: 64%

“…However, to produce a compound with a specific stoichiometry, co-precipitation is the preferred route. Nevertheless supported cobalt-manganese oxide spinel has been prepared on graphene by an impregnation route [28] and used as a bifunctional catalyst.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Muneam

Hadi²,

Kareem³

et al. 2016

Int J Ind Chem

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“…Although cell failure due to Li dendrite formation has been extensively studied for Li-ion battery application 15 , it is not clear if such a mechanism is applicable to the Li-O 2 batteries because of the differences in the cell construction, materials and operating environments. At present, the studies on the cyclability and stability of Li-O 2 batteries have been primarily focused on the cathode catalysts [16][17][18][19][20][21][22][23][24][25][26][27][28][29] , electrolytes [30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] , binder 45 and so on. For example, the electrolyte decomposition was found during the cycling of Li-O 2 batteries, which led to the formation of by-products such as H 2 O, CO 2 , insoluble Li salts, and the eventual degradation of the cathode and the separator [33][34][35][36][46][47][48][49][50][51] .…”

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confidence: 99%

Reversibility of anodic lithium in rechargeable lithium–oxygen batteries

et al. 2013

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Non-aqueous lithium-air batteries represent the next-generation energy storage devices with very high theoretical capacity. The benefit of lithium-air batteries is based on the assumption that the anodic lithium is completely reversible during the discharge-charge process. Here we report our investigation on the reversibility of the anodic lithium inside of an operating lithium-air battery using spatially and temporally resolved synchrotron X-ray diffraction and three-dimensional micro-tomography technique. A combined electrochemical process is found, consisting of a partial recovery of lithium metal during the charging cycle and a constant accumulation of lithium hydroxide under both charging and discharging conditions. A lithium hydroxide layer forms on the anode separating the lithium metal from the separator. However, numerous microscopic 'tunnels' are also found within the hydroxide layer that provide a pathway to connect the metallic lithium with the electrolyte, enabling sustained iontransport and battery operation until the total consumption of lithium.

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“…Overpotential (and capacity) values of non-aqueous and hybrid Li-air cells utilizing various catalysts are summarized in Table 4 13,71-91) and Table 5 53,92,133,154,164) respectively. Also refer to Fig.…”

Section: Survey Of Catalyst Research In Li-air Cellsmentioning

confidence: 99%

Practical Challenges Associated with Catalyst Development for the Commercialization of Li-air Batteries

Park

Kim

Seo

et al. 2014

Journal of Electrochemical Science and Technology

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ABSTRACT:Li-air cell is an exotic type of energy storage and conversion device considered to be half battery and half fuel cell. Its successful commercialization highly depends on the timely development of key components. Among these key components, the catalyst (i.e., the core portion of the air electrode) is of critical importance and of the upmost priority. Indeed, it is expected that these catalysts will have a direct and dramatic impact on the Li-air cell's performance by reducing overpotentials, as well as by enhancing the overall capacity and cycle life of Li-air cells. Unfortunately, the technological advancement related to catalysts is sluggish at present. Based on the insights gained from this review, this sluggishness is due to challenges in both the commercialization of the catalyst, and the fundamental studies pertaining to its development. Challenges in the commercialization of the catalyst can be summarized as 1) the identification of superior materials for Li-air cell catalysts, 2) the development of fundamental, material-based assessments for potential catalyst materials, 3) the achievement of a reduction in both cost and time concerning the design of the Li-air cell catalysts. As for the challenges concerning the fundamental studies of Li-air cell catalysts, they are 1) the development of experimental techniques for determining both the nano and micro structure of catalysts, 2) the attainment of both repeatable and verifiable experimental characteristics of catalyst degradation, 3) the development of the predictive capability pertaining to the performance of the catalyst using fundamental material properties. Therefore, under the current circumstances, it is going to be an extremely daunting task to develop appropriate catalysts for the commercialization of Li-air batteries; at least within the foreseeable future. Regardless, nano materials are expected to play a crucial role in this field.

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CoMn2O4 Spinel Nanoparticles Grown on Graphene as Bifunctional Catalyst for Lithium-Air Batteries

Cited by 227 publications

References 29 publications

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Preparation and characterization of (Co,Mn)(Co,Mn)2O4/MgO catalysts

Reversibility of anodic lithium in rechargeable lithium–oxygen batteries

Practical Challenges Associated with Catalyst Development for the Commercialization of Li-air Batteries

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