Yonghong Bing scite author profile

In this critical review, we present the current technological advances in proton exchange membrane (PEM) fuel cell catalysis, with a focus on strategies for developing nanostructured Pt-alloys as electrocatalysts for the oxygen reduction reaction (ORR). The achievements are reviewed and the major challenges, including high cost, insufficient activity and low stability, are addressed and discussed. The nanostructured Pt-alloy catalysts can be grouped into different clusters: (i) Pt-alloy nanoparticles, (ii) Pt-alloy nanotextures such as Pt-skins/monolayers on top of base metals, and (iii) branched or anisotropic elongated Pt or Pt-alloy nanostructures. Although some Pt-alloy catalysts with advanced nanostructures have shown remarkable activity levels, the dissolution of metals, including Pt and alloyed base metals, in a fuel cell operating environment could cause catalyst degradation, and still remains an issue. Another concern may be low retention of the nanostructure of the active catalyst during fuel cell operation. To facilitate further efforts in new catalyst development, several research directions are also proposed in this paper (130 references).

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Electric-field-induced redistribution of polar nano-regions in a relaxor ferroelectric

Zhong

et al. 2006

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Relaxor ferroelectrics, with their strong dependence of polarization on the applied electric field, are of considerable technological importance. On a microscopic scale, however, there exists competition as well as coexistence between short-range and long-range polar order. The conventional picture is that the polar nano-regions (PNRs) that appear at high temperatures beyond the Curie transition, form nuclei for the field-induced long-range order at low temperatures. Here, we report high-energy X-ray diffuse-scattering measurements on the relaxor Pb(Zn(1/3)Nb(2/3))O(3) (PZN) to study the short-range polar order under an electric field applied along the [111] direction. In contrast to conventional expectations, the overall diffuse-scattering intensity is not suppressed. On the other hand, the field induces a marked change on the shape of the three-dimensional diffuse-scattering intensity pattern, corresponding to a redistribution of PNRs in real space. We show that these surprising results are consistent with a model in which the PNRs with [110]-type polarizations, orthogonal to that of the surrounding environment, are embedded and persist in the [111]-polarized ferroelectric order of the bulk.

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Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

165

106

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The microstructure and phase transition in relaxor ferroelectric Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) and its solid solution with PbTiO 3 (PT), PMN-xPT, remain to be one of the most puzzling issues of solid state science. In the present work we have investigated the evolution of the phase symmetry in PMN-xPT ceramics as a function of temperature (20 K < T < 500 K) and composition (0 ≤ x ≤ 0.15) by means of high-resolution synchrotron x-ray diffraction. Structural analysis based on the experimental data reveals that the substitution of Ti 4+ for the complex B-site (Mg 1/3 Nb 2/3 ) 4+ ions results in the development of a clean rhombohedral phase at a PT-concentration as low as 5%. The results provide some new insight into the development of the ferroelectric order in PMN-PT, which has been discussed in light of the kinetics of polar nanoregions and the physical models of the relaxor ferroelectrics to illustrate the structural evolution from a relaxor to a ferroelectric state.

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Empirical scaling of the dielectric permittivity peak in relaxor ferroelectrics

et al. 2003

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Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Ground state of the relaxor ferroelectric Pb(Zn1/3Nb2/3)O3 Xu, Guangyong; zhang, Z.; Bing, Y.; Ye, Z.-G.; Stock, C.; Shirane, G.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevB.67.104102Physical Review B, 67,10 High energy x-ray diffraction measurements on Pb(Zn 1/3 Nb 2/3 )O 3 ͑PZN͒ single crystals show that the system does not have a rhombohedral symmetry at room temperature as previously believed. The phase ͑X͒ in the bulk of the crystal gives Bragg peaks similar to that of a nearly cubic lattice with a slight tetragonal distortion. The Bragg profile remains sharp with no evidence of size broadening due to the polar microcrystals. However, in our preliminary studies of the skin, we have found the expected rhombohedral ͑R͒ phase as a surface state. On the other hand, studies on an electric-field poled PZN single crystal clearly indicate a rhombohedral phase at room temperature.

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Yonghong Bing

Nanostructured Pt-alloy electrocatalysts for PEM fuel cell oxygen reduction reaction

Electric-field-induced redistribution of polar nano-regions in a relaxor ferroelectric

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

Empirical scaling of the dielectric permittivity peak in relaxor ferroelectrics

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
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Yonghong Bing

Nanostructured Pt-alloy electrocatalysts for PEM fuel cell oxygen reduction reaction

Electric-field-induced redistribution of polar nano-regions in a relaxor ferroelectric

Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3Ye1, Bing2, Gao3 et al. 2003Phys. Rev. B

Empirical scaling of the dielectric permittivity peak in relaxor ferroelectrics

Ground state of the relaxor ferroelectricPb(Zn1/3NbXu1, Zhong2, Bing3 et al. 2003Phys. Rev. B869771View full textAdd to dashboardCite

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Development of ferroelectric order in relaxor(1−x)Pb(Mg1/3
Ye
¹
,
Bing
²
,
Gao
³

et al. 2003
Phys. Rev. B

Ground state of the relaxor ferroelectricPb(Zn1/3Nb
Xu
¹
,
Zhong
²
,
Bing
³

et al. 2003
Phys. Rev. B
86
9
77
1
View full text Add to dashboard Cite