Nanoionics phenomenon in proton-conducting oxide: Effect of dispersion of nanosize platinum particles on electrical conduction properties

Matsumoto, Hiroshige; Furuya, Yoshihisa; Okada, Sachio; Tanji, Takayoshi; Ishihara, Tatsumi

doi:10.1016/j.stam.2007.09.008

Cited by 13 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In case of the “Ohmic” BZCY/Pd junctions, the [

{normalH}_{normali}^{\cdot}

] in the interfacial region of BZCY electrolyte is not depleted according to the hole–proton equilibrium because Ohmic contact accepts relatively high [h • ] in the interfacial region (Figure c,e), whereas allowable [

{normalH}_{normali}^{\cdot}

] in the interfacial region of the Schottky‐type junction would be much lower than that of the Ohmic contact because of lowering [h • ] in the interfaces (Figure d,f). In fact, it has been reported that the SrZr 0.9 Y 0.1 O 3 /Pd junction which forms Schottky‐type potential barrier with wide depletion layer at the interface shows lessened conductivity because the proton concentrations in the interfacial layer becomes smaller than those of the SrZr 0.9 Y 0.1 O 3 bulk . These imply that the proton incorporation via “Ohmic” BZCY/Pd junction is much faster than that via Schottky‐type junction due to the relatively large acceptable concentrations of hydrogen defects ([

{normalH}_{normali}^{\cdot}

]) in the interfacial region (Figure e).…”

Section: Discussionmentioning

confidence: 99%

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions

et al. 2017

View full text Add to dashboard Cite

natural power electricity without relying on fossil fuels, and thus a fierce development race is going on to make "clean hydrogen" economically and technologically viable. Advent of hydrogen economy, however, cannot be realized until technical issues related to hydrogen production, transportation, and a storage infrastructure are clear. Ammonia is a highly efficient hydrogen carrier since it can be easily liquefied to store and transport at room temperature, is widely available, is carbon-free, and has hydrogen capacity larger than the liquid hydrogen. [1][2][3][4] Hence, it is strongly motivated to utilize ammonia in fuel cells for the direct conversion of ammonia chemical energy to electricity in a high efficiency. The proton conducting ceramic fuel cells (PCFCs) using protonconducting oxide electrolytes, such as BaZr x Ce 0.8−x Y 0.2 O 3−δ, is promising as a direct ammonia type fuel cell operating at the intermediate temperature (IT) range (400-600 °C) for stationary applications. [4][5][6][7][8][9] Because water formation in PCFCs is mainly progressive at the cathode side, unlike solid oxide fuel cells (SOFCs), and therefore, mixing of the ammonia fuels into the exhaust water is precluded, thereby eliminating repurification of water exhaust and simplifying total systems. Moreover, formation of environmentally hazardous substances NO x at the anode is discouraged if the proton conductivity is much higher than the minor oxide ion conductivity.Although the resistivity and related activation energy of proton conductors are smaller than oxide ion conductors used in SOFCs, the performances of the current PCFCs, however, are far behind the SOFCs even with pure H 2 fuels because of large interfacial polarization due to a lack of suitable cathode [10][11][12][13][14] and the deteriorated microstructural electrolyte. [15][16][17][18] Meanwhile, exceptionally high power output has been reported in the IT range for hydrogen membrane fuel cell (HMFC), [19][20][21][22][23] which comprises a thin proton conducting ceramic electrolyte supported on a dense hydrogen permeable metal anode with the anode reactions driven by separation of the monoatomic hydrogen dissolves into protons and electrons at electrolyte/ nonporous-anode solid-solid interfaces (Figure 1a). Regardless of its simple cell structure, the HMFC based on BaCe 0.8 Y 0.2 O 3 (BCY) thin film and Pd foil has achieved the maximum power density of 1.4 W cm −2 at 600 °C, [19,20] which is still higher than the average performances of recently reported highly efficiency PCFCs at the temperatures. [24][25][26][27] Here, we report on the highly

show abstract

“…In case of the “Ohmic” BZCY/Pd junctions, the [

{normalH}_{normali}^{\cdot}

{normalH}_{normali}^{\cdot}

{normalH}_{normali}^{\cdot}

]) in the interfacial region (Figure e).…”

Section: Discussionmentioning

confidence: 99%

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The potential of nanoionics to create a super-ionic composite conductor represents a particularly fascinating and practical application. This can be created by engineering an ionic composite with appropriately spaced metal nanoparticles (NPs) to create a percolating space charge region that acts as a fast pathway for ion conduction [7][8][9][10][11]. One key issue with this approach is the need to prevent agglomeration of the metal NPs during the processing of the super-ionic composite.…”

Section: Introductionmentioning

confidence: 99%

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Simonds

Subramaniyan

O’Hayre

et al. 2012

Journal of Magnetic Resonance

View full text Add to dashboard Cite

“…Cerversa et al [46] have compared the protonic conduction of nanostructured BaZr 0.8 Y 0.2 O 3 − δ and found a contradictory effect when comparing with the overall conduction for the bulk conductivity of BaZr 0.8 Y 0.2 O 3 − δ which was already reported by Kreuer [85]. Matsumoto et al [120] made an experimental observation and established a marked change in the electrical properties in the proton conductor SrZr 0.9 Y 0.1 O 3−δ by dispersing fine platinum particles. An experimental comparative study was made with pure SrZr 0.9 Y 0.1 O 3−δ and Pt/ SrZr 0.9 Y 0.1 O 3−δ .…”

Section: Grain Boundary Conductivity In Nanoperovskitesmentioning

confidence: 91%

“…But some perovskites showed a decrease in conductivity due to the higher resistance shown by the grain boundaries. By incorporating a threshold amount of metals like platinum, it was observed that the electrical conductivity of protonic and oxide ionic conductors could be brought down significantly [120]. In certain cases, additional doping has also improved the conductivity [121][122][123][124][125].…”

Section: Grain Boundary Conductivity In Nanoperovskitesmentioning

confidence: 99%

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

Madhavan

Ashok

2014

Ionics

View full text Add to dashboard Cite

Perovskite materials exhibiting proton and oxide ion conductivities have been utilized for various energyrelated applications such as solid oxide fuel cells (SOFCs), hydrogen production, gas sensors, etc. Nowadays, perovskites are being synthesized as nanoperovskites and studied for catalytic activity and energy-related applications. In this article, their synthesis in brief, the mechanism of proton and oxide ion conduction, and some specific properties and behaviors of few nanoperovskites as oxide ion and proton conductors and applications have been reported and discussed.

show abstract

Nanoionics phenomenon in proton-conducting oxide: Effect of dispersion of nanosize platinum particles on electrical conduction properties

Cited by 13 publications

References 11 publications

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

Contact Info

Product

Resources

About

Nanoionics phenomenon in proton-conducting oxide: Effect of dispersion of nanosize platinum particles on electrical conduction properties

Cited by 13 publications

References 11 publications

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr0.1Ce0.7Y0.2O3−δ/Pd Oxide‐Metal Junctions

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr0.1Ce0.7Y0.2O3−δ/Pd Oxide‐Metal Junctions

Conduction electron resonance used to determine size of palladium nanoparticles in proton conducting ceramics

Review on nanoperovskites: materials, synthesis, and applications for proton and oxide ion conductivity

Contact Info

Product

Resources

About

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions

High‐Efficiency Direct Ammonia Fuel Cells Based on BaZr_0.1Ce_0.7Y_0.2O₃₋_δ/Pd Oxide‐Metal Junctions