<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0872-1904</journal-id>
<journal-title><![CDATA[Portugaliae Electrochimica Acta]]></journal-title>
<abbrev-journal-title><![CDATA[Port. Electrochim. Acta]]></abbrev-journal-title>
<issn>0872-1904</issn>
<publisher>
<publisher-name><![CDATA[Sociedade Portuguesa de Electroquímica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0872-19042003000400004</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Electrochemical Oxidation of D-Sorbitol and D-Manitol on Platinum Monocrystalline Surfaces]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Proença]]></surname>
<given-names><![CDATA[L.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Silva]]></surname>
<given-names><![CDATA[A.J.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lopes]]></surname>
<given-names><![CDATA[M.I.S.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fonseca]]></surname>
<given-names><![CDATA[I.T.E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodes]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aldaz]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidade de Lisboa Faculdade de Ciências Departamento de Química e Bioquímica]]></institution>
<addr-line><![CDATA[Lisboa ]]></addr-line>
<country>Portugal</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Alicante Departamento de Química Física ]]></institution>
<addr-line><![CDATA[Alicante ]]></addr-line>
<country>España</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2003</year>
</pub-date>
<volume>21</volume>
<numero>4</numero>
<fpage>327</fpage>
<lpage>343</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_arttext&amp;pid=S0872-19042003000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_abstract&amp;pid=S0872-19042003000400004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.pt/scielo.php?script=sci_pdf&amp;pid=S0872-19042003000400004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The electrochemical oxidation of D-sorbitol and D-mannitol was studied on two sets of stepped platinum single-crystal surfaces vicinal to the basal plane (111), as well as on a set of surfaces with monoatomic steps vicinal to the surface Pt(100). The aim of this study, conducted by cyclic voltammetry, was to check the influence of the crystalline surface structure (regarding terrace and step orientations) on the electrochemical oxidation process of the two polyols in platinum. The electrochemical oxidation reactions of D-sorbitol and D-mannitol were shown to be markedly influenced by the symmetry of the bidimensional domains as well as by the distribution of the orientated defects (monoatomic steps) on the platinum surfaces. The introduction of orientated defects leads to a reduction on peak current densities along with an increase in activity at lower potentials. The terrace width is clearly decisive to the oxidation process on the set of surfaces belonging to the series Pt(S) [(n-1) (111) × (110)].]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[A oxidação electroquímica do D-sorbitol e D-manitol foi estudada para dois conjuntos de superfícies monocristalinas de platina, com degraus monoatómicos, vicinais ao plano basal (111) e ainda para um conjunto de superfícies com degraus monoatómicos vicinais à superfície Pt(100). Este estudo, por voltametria cíclica, teve por objectivo obter informação sobre a influência da geometria de sítios superfíciais (tanto da orientação dos degraus quanto da dos terraços) no processo de oxidação electroquímica dos dois polióis em platina. A reacção de oxidação electroquímica do D-sorbitol e D-manitol é sensível à simetria dos domínios bidimensionais, bem como à distribuição dos defeitos orientados (degraus monoatómicos) nas superfícies de platina. A introdução de defeitos ordenados leva a uma redução geral das densidades de corrente de pico a par de um aumento de actividade aos potenciais menos positivos. A largura dos terraços é claramente decisiva para o processo de oxidação nas superfícies pertencentes à série Pt(S) [(n-1) (111) × (110)].]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Electrochemical oxidation]]></kwd>
<kwd lng="en"><![CDATA[D-sorbitol]]></kwd>
<kwd lng="en"><![CDATA[D-manitol]]></kwd>
<kwd lng="en"><![CDATA[platinum]]></kwd>
<kwd lng="en"><![CDATA[single-crystal surfaces]]></kwd>
<kwd lng="en"><![CDATA[monoatomic steps]]></kwd>
<kwd lng="pt"><![CDATA[Oxidação electroquímica]]></kwd>
<kwd lng="pt"><![CDATA[D-sorbitol]]></kwd>
<kwd lng="pt"><![CDATA[D-manitol]]></kwd>
<kwd lng="pt"><![CDATA[platina]]></kwd>
<kwd lng="pt"><![CDATA[superfícies monocristalinas]]></kwd>
<kwd lng="pt"><![CDATA[degraus monoatómicos]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="center"><b>Electrochemical Oxidation of D-Sorbitol and D-Manitol on    Platinum Monocrystalline Surfaces</b></p>      <p>&nbsp;</p>      <p align=center><b><a name="top1"></a>L. Proença<a href="#back1">*</a>, A.J. Silva,    M.I.S. Lopes, I.T.E. Fonseca, A. Rodes <sup>a)</sup>, A. Aldaz <sup>a)</sup></b></p>      <p align=center>CECUL, Departamento de Química e Bioquímica, Faculdade de Ciências    da Universidade de Lisboa, Edifício C8, Campo Grande, 1749-016 Lisboa, Portugal.</p>      <p align=center><sup>a)</sup> Departamento de Química Física, Universidad de Alicante,  Apartado 99, E-03080  Alicante, España</p>        <p align="center">Received 10 January 2003; accepted 6 November 2003</p>     <p>&nbsp;</p>      <p><b>Abstract</b></p>      <p>The electrochemical oxidation of D-sorbitol and D-mannitol was studied on two    sets of stepped platinum single-crystal surfaces vicinal to the basal plane    (111), as well as on a set of surfaces with monoatomic steps vicinal to the    surface Pt(100). The aim of this study, conducted by cyclic voltammetry, was    to check the influence of the crystalline surface structure (regarding terrace    and step orientations) on the electrochemical oxidation process of the two polyols    in platinum.</p>        <p>The electrochemical oxidation reactions of D-sorbitol and D-mannitol were shown    to be markedly influenced by the symmetry of the bidimensional domains as well    as by the distribution of the orientated defects (monoatomic steps) on the platinum    surfaces. The introduction of orientated defects leads to a reduction on peak    current densities along with an increase in activity at lower potentials. The    terrace width is clearly decisive to the oxidation process on the set of surfaces    belonging to the series Pt(S) &#91(<i>n</i>-1) (111) &#215 (110)&#93.</p>       ]]></body>
<body><![CDATA[<p><b>Keywords</b>: Electrochemical oxidation, D-sorbitol, D-manitol, platinum,    single-crystal surfaces, monoatomic steps.</p>     <p>&nbsp;</p>     <p><b>Resumo</b></p>     <p>A oxida&ccedil;&atilde;o electroqu&iacute;mica do D-sorbitol e D-manitol foi    estudada para dois conjuntos de superf&iacute;cies monocristalinas de platina,    com degraus monoat&oacute;micos, vicinais ao plano basal (111) e ainda para    um conjunto de superf&iacute;cies com degraus monoat&oacute;micos vicinais &agrave;    superf&iacute;cie Pt(100). Este estudo, por voltametria c&iacute;clica, teve    por objectivo obter informa&ccedil;&atilde;o sobre a influ&ecirc;ncia da geometria    de s&iacute;tios superf&iacute;ciais (tanto da orienta&ccedil;&atilde;o dos    degraus quanto da dos terra&ccedil;os) no processo de oxida&ccedil;&atilde;o    electroqu&iacute;mica dos dois poli&oacute;is em platina.</p>     <p>A reac&ccedil;&atilde;o de oxida&ccedil;&atilde;o electroqu&iacute;mica do    D-sorbitol e D-manitol &eacute; sens&iacute;vel &agrave; simetria dos dom&iacute;nios    bidimensionais, bem como &agrave; distribui&ccedil;&atilde;o dos defeitos orientados    (degraus monoat&oacute;micos) nas superf&iacute;cies de platina. A introdu&ccedil;&atilde;o    de defeitos ordenados leva a uma redu&ccedil;&atilde;o geral das densidades    de corrente de pico a par de um aumento de actividade aos potenciais menos positivos.    A largura dos terra&ccedil;os &eacute; claramente decisiva para o processo de    oxida&ccedil;&atilde;o nas superf&iacute;cies pertencentes &agrave; s&eacute;rie    Pt(S) [(n-1) (111) &#215 (110)&#93.</p>     <p><b><i>Palavras-chave:</i></b> Oxida&ccedil;&atilde;o electroqu&iacute;mica,    D-sorbitol, D-manitol, platina, superf&iacute;cies monocristalinas, degraus    monoat&oacute;micos. </p>      <p>&nbsp;</p>     <p>Texto completo disponível apenas em PDF.</p>      <p>Full text only in PDF format.</p>      <p>&nbsp;</p>      ]]></body>
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