Bi‐Functional Oxygen Electrode Using Large Surface Area La1 − x Ca x CoO3 for Rechargeable Metal‐Air Battery

Shimizu, Youichi; Uemura, Kenichi; Matsuda, H.; Miura, Norio; Yamazoe, Noboru

doi:10.1149/1.2086234

Cited by 170 publications

(72 citation statements)

References 28 publications

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“…48 Work has been done in the past on electrocatalysts such as perovskites [48][49][50][51] and transition metal macrocycles 52 in order to develop alternative catalysts to the expensive noble metals 53-55 and silver. 56 Air electrodes have been used in alkaline Zn-air cells since 1930s but they contained thick porous carbon electrodes where the rate of oxygen transport was limited by the thick structure.…”

Section: Al-air Battery: a Historical Backgroundmentioning

confidence: 99%

The study of aluminium anodes for high power density Al/air batteries with brine electrolytes

Nestoridi¹,

Pletcher²,

Wood³

et al. 2008

Journal of Power Sources

186

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In this thesis aluminium alloys containing small additions of both tin (~ 0.1 wt %) and gallium (~ 0.05 wt %) are shown to dissolve anodically at high rates in sodium chloride media at room temperatures; current densities > 0.2 A cm -2 can be obtained at potentialsclose to the open circuit potential, ~ -1.5 V vs SCE. Alloys that do not contain both tin and gallium were shown not to dissolve at such a negative potential. The tin exists in the alloys as a second phase, typically as ~ 1 µm inclusions (precipitates) distributed throughout the aluminium structure, and anodic dissolution occurs to form rounded pits around the tin inclusions. The pits were different in structure from the crystallographic pits commonly observed with Al and other alloys. The change in pit structure and the negative shift in dissolution potential indicate that the AlMgSnGa alloys dissolve by a different mechanism. Although the distribution of the gallium in the alloy could not be established, it is also shown to be critical in the formation of these pits as well as maintaining their activity. The stability of the alloys to open circuit corrosion and the overpotential for high rate dissolution, both critical to battery performance, is shown to depend on factors in addition to elemental composition; both heat treatment and mechanical working influence the performance of the alloy. The correlation between alloy performance and their microstructure has been investigated.iii Imaging of the surface with a resolution of 10 -20 µm was used for the direct observation of the anodic dissolution of aluminium alloys containing Sn and Ga. The resolution allows confirmation that hydrogen evolution occurs from the Sn inclusions.

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Section: Al-air Battery: a Historical Backgroundmentioning

confidence: 99%

The study of aluminium anodes for high power density Al/air batteries with brine electrolytes

Nestoridi¹,

Pletcher²,

Wood³

et al. 2008

Journal of Power Sources

186

View full text Add to dashboard Cite

show abstract

“…A precursor amorphous gel with the desired metal ion ratios was prepared from lead nitrate, Ru nitrosyl nitrate (reagent grade) and citric acid (reagent grade) in a rotary vacuum dryer (65 o C, 50-100 rpm, 2 h) [18]. The gels were placed inside a crucible and calcined in air for 2 h at 350 o C. For a comparison, pyrochlore powders were synthesized by conventional HD [15].…”

Section: Powder Fabrication and Characterizationmentioning

confidence: 99%

“…Several oxide powders have been prepared by the amorphous citrate precursor (ACP) method and exhibited surface areas of about 10-30 m 2 /g [13][14]18]. However, little has been reported on the application of ACP for pyrochlore used in this study.…”

Section: Introductionmentioning

confidence: 99%

Electrocatalytic performance of Pb−Ru pyrochlore prepared by the amorphous citrate precursor method for bifunctional air electrodes

Lee

Sohn

2002

Met. Mater. Int.

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Pb-Ru pyrochlore has been of interest as bifunctional electrocatalyst for an air electrode. An amorphous citrate precursor (ACP) process has been optimized to prepare Pb-Ru pyrochlore powders with high surface areas with consequent improvement of its electrocatalytic performance in an air electrode. The surface area of the final powder is 30 m 2 /g, which is larger than the value obtained by the conventional hydroxide method. A PTFE-bonded gas diffusion electrode loaded with pyrochlore catalysts prepared by the ACP method showed good bifunctional performance. The electrode loaded with only 10 mg/cm 2 of pyrochlore powder prepared by ACP showed good bifunctional performance, i.e. 100 mA/cm 2 for oxygen reduction and 100 mA/cm 2 for oxygen evolution, at 0.6 and 1.6 V vs. RHE, respectively. This performance compares well to the results from lower-area pyrochlore at much higher loading.

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“…The tetragonal structure of perovskites showing the local displacements leads to the variation in electric behavior of this material (Figure 1). Many applications of perovskites (here ABO 3 ) are reported in electrodes of solid oxide fuel cells [2], metal-air batteries [3], gas sensors [4], and high-performance catalysts [5].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, 95% sensing response of CoFe 2 O 4 observes toward NO 2 compared to other gases at an operating temperature of 150°C, 5 seconds response time and 117 seconds recovery time with NO 2 gas[23]. Performing the same sensors for SO 2 , NH3 , and H 2 S was given just 3%, 6%, and 7%, respectively. The ferrites such as NiFe 2 O 4 , ZnFe 2 O 4 , MgFe 2 O 4 , ZnAl 2 O 4 , CoAl 2 O 4 , and MgAl 2 O 4 shows the gas response 10-20% for H 2 S and 1-10% for NH 3 gas at 300°C operating temperature.…”

mentioning

confidence: 99%

Perovskites-Based Nanomaterials for Chemical Sensors

Enhessari¹,

Salehabadi²

2016

Progresses in Chemical Sensor

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The perovskite structure is adopted by many compounds in solid-state chemistry. The sensitivity, selectivity, and stability of many perovskite nanomaterials have been devoted the most attention for chemical sensors. They are capable to sense the level of small molecules such as O 2 , NO, and CO. This chapter provides a comprehensive overview of perovskite nanoscale materials that concentrate on chemical sensors. The perovskite structure, with two differently sized cations, is amenable to a variety of dopant additions. This flexibility allows for the control of transport and catalytic properties, which are important for improving sensor performance. We devote the most attention on the synthesis, structural information, and sensing mechanism. We will later elaborate on the development mechanism of chemical sensors based on perovskite nanomaterials. We conclude this chapter with the personal perspectives on the directions toward future works on a novelty of nanostructured chemical sensors.

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Bi‐Functional Oxygen Electrode Using Large Surface Area La1 − x Ca x CoO3 for Rechargeable Metal‐Air Battery

Cited by 170 publications

References 28 publications

The study of aluminium anodes for high power density Al/air batteries with brine electrolytes

The study of aluminium anodes for high power density Al/air batteries with brine electrolytes

Electrocatalytic performance of Pb−Ru pyrochlore prepared by the amorphous citrate precursor method for bifunctional air electrodes

Perovskites-Based Nanomaterials for Chemical Sensors

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