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寶MMC金蟲(chóng) (小有名氣)
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幫忙翻譯化學(xué)文獻(xiàn)中的英文 英譯漢2-3
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2. Transition metal nitrides (TMNs) are ideal candidates for noble metal catalyst supports in DMFCs because they are highly electrically conductive (metallic), thermally stable with high melting points, electrochemically stable in fuel cell operating conditions, and exhibit exceptional hardness and corrosion resistance. 21−23 However, in terms of fuel cell application, there are few publications dealing with metal nitrides as catalyst supports. The performance of a tungsten nitride supported on carbon black (W 2 N/C) as a non-noble electrocatalyst for the oxygen reduction reaction (ORR) in PEMFCs has been reported; this report concluded that the activity of the W 2 N/C catalyst toward the ORR was inferior to that of commercially available Pt/C catalysts already widely used in PEMFCs. 24 Titanium nitride (TiN) seems to be the most widely studied, but it suffers from wear and corrosion in acidic environments. 9,25,26 In contrast, chromium nitride (CrN) has high resistance to wear and corrosion. 27,28 CrN has been used as a coating material for bipolar plates in fuel cells, which is an important component of PEMFC stacks. 29,30 3. Various synthetic approaches to nanostructured metal nitrides have been reported including vapor deposition, nanopatterning, or other templating. 31−33 We recently reported a simple route for preparing mesoporous, conducting nitrides from Zn, Cd, or K-containing ternary transition metal oxides. 22,34,35 The reported nitride materials result from the condensation of atomic scale voids created by the evaporative loss of Zn or Cd, the replacement of 3 oxygen anions by 2 nitrogen anions, and, in most cases, the loss of oxygen to form water on the reduction of the transition metal. In the K case, the byproduct does not sublime away, but may be removed by washing with water. In this Article, we demonstrate a facile synthesis of mesoporous CrN with smaller pores and higher surface area than attainable using Zn- or Cd-containing precursor oxides from a potassium-containing oxide. We subsequently show that the CrN can be used as a Pt catalyst support for methanol electrooxidation, resulting in a Pt/CrN electrocatalyst that displays both higher electrocatalytic activity and higher corrosion resistance than the conventional Pt/C catalyst in PEMFCs. |
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RXMCDM
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寶MMC: 金幣+40, 翻譯EPI+1, ★★★很有幫助, 謝謝啦！還有幾段，謝謝！ 2013-12-01 15:41:16
寶MMC: 金幣+40, 翻譯EPI+1, ★★★很有幫助, 謝謝啦！還有幾段，謝謝！ 2013-12-01 15:41:16
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2 。在DMFCs（direct methanol fuel cells，DMFC）中，過(guò)渡金屬氮化物（ TMNs ）是一種理想的貴金屬催化劑支持物，因其為高導(dǎo)電性（金屬） ，較高熔點(diǎn)熱穩(wěn)定，在燃料電池運(yùn)行條件下電化學(xué)性質(zhì)穩(wěn)定，卓越的硬度和耐蝕性。 21-23然而，燃料電池應(yīng)用方面鮮有處理金屬氮化物作為催化劑載體的專(zhuān)著。炭黑（W 2 N / C ）支持氮化鎢作為一個(gè)非貴金屬電催化劑在PEMFC催化氧還原反應(yīng)（ ORR）的性能已見(jiàn)報(bào)道。結(jié)論是，在W 2 N / C催化劑對(duì)ORR催化活性劣于已廣泛用于PEMFC的市售Pt / C催化劑。 24氮化鈦（TIN）似乎研究最廣泛，但是易磨損，酸性環(huán)境中易受到腐蝕。 9,25,26相反，氮化鉻（氮化鉻）耐磨和耐腐蝕。 27,28CrN在燃料電池中已用作雙極板涂層材料，雙極板是燃料電池的重要組成部分。 29,30 3。已報(bào)道納米金屬氮化物合成方法包括氣相沉積，納米圖案或其他模板。 31-33最近，我們報(bào)道了制備介孔的簡(jiǎn)單路徑，對(duì)鋅，鎘，或含有K-三元過(guò)渡金屬氧化物進(jìn)行氮化。 22,34,35報(bào)告氮化物材料由Zn或Cd的蒸發(fā)損失，3氧陰離子置換由2個(gè)氮陰離子產(chǎn)生原子級(jí)的空隙縮合產(chǎn)生。并且，在大多數(shù)情況下，過(guò)渡金屬還原損失的氧形成水。在K的情況下，副產(chǎn)物不會(huì)消失，但可通過(guò)用水洗滌除去。本文中，我們展示了一個(gè)淺顯的合成具有比現(xiàn)存使用鋅或鎘含鉀氧化物前體氧化物更小的孔和更大的表面積介孔氮化鉻。我們隨后表明，氮化鉻可作為甲醇電化學(xué)氧化的Pt催化劑載體，產(chǎn)生的Pt /氮化鉻電催化劑與PEMFC傳統(tǒng)的Pt / C催化劑比較，具有更高電催化活性和更好的耐腐蝕性。 PEMFC這個(gè)詞應(yīng)該比較簡(jiǎn)單，沒(méi)有翻譯！ |
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