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幫忙翻譯化學(xué)論文中的英文 英譯漢14-15
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14. Pt/CuNWs, PtNTs (Cu), PtNTs (Ag), Pt/C, and BPPt were examined for ORR activity with RDE experiments (Figure 3). Kinetic activity was evaluated at 0.9 V vs RHE during anodic voltammograms at 1600 rpm and 20 mV s−1 in an oxygen saturated 0.1 M HClO4 electrolyte. 19,20 Catalyst activity for ORR was normalized to the total metal mass (M), Pt mass (Pt), and dollar (Figure 4 and Supporting Information, Figure S.6). Pt/CuNWs produced a metal mass activity of 0.082 A mg M−1 , within 97% of PtNTs (Cu). Pt/CuNWs further produced a Pt mass activity of 0.45 A mg Pt−1 , 3.5% greater than the DOE Pt target. Pt/CuNWs exhibited a dollar activity of 9.8 A $−1 , 1.4% greater than the dollar target, calculated from the DOE mass activity target. Catalysts were also evaluated in terms of area activity. Of particular interest was the large area activity of Pt/CuNWs and PtNTs (Cu), each exceeding the former DOE target by 2.1 times, Pt/C by 6.2 times, and reaching 77% the activity of BPPt. Pt/CuNWs and PtNTs (Cu) further exceeded the area activity of PtNTs (Ag) by 43%. 15. Electronic tuning potentially contributed to the high area activity of Pt/CuNWs and PtNTs (Cu). The CuNW template and Cu alloying within the Pt layer introduced compressive strain, widening the Pt d-band and shifting the center further from the Fermi level; the d-band center shift weakened oxygen chemisorption, improving ORR activity. 21 The d-band e ff ect for Pt Cu systems was previously con fi rmed on the following: a Pt shell on Pt Cu nanoparticles; 22 a Pt overlayer on Cu; 23 and a Pt Cu alloy. 23 |
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2樓2013-11-17 21:38:48
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14。鉑/ CuNWs，PtNTs（銅），PtNTs（銀）的Pt / C和BPPT用RDE實(shí)驗(yàn)檢測(cè)氧還原活性（圖3）。在0.9 V vs RHE1600轉(zhuǎn)每分和20 mV每秒動(dòng)氧氣飽和的0.1M高氯酸電解質(zhì)陽(yáng)極伏安法力進(jìn)行動(dòng)力活性測(cè)定。19,20 ORR催化活性以總金屬質(zhì)量（M），鉑質(zhì)量（Pt）和美元成本（圖4和支持信息，圖S.6）進(jìn)行標(biāo)化。鉑/ CuNWs產(chǎn)生0.082每毫克質(zhì)量的金屬質(zhì)量活性，為PtNTs（銅）的97％。鉑/ CuNWs產(chǎn)生的鉑質(zhì)量活性為0.45A每毫克Pt，比美國(guó)能源部的Pt標(biāo)準(zhǔn)高出3.5％。鉑/ CuNWs的美元活性為9.8A每美元，比美國(guó)能源部的質(zhì)量美元活性目標(biāo)高1.4％。催化劑活性同時(shí)采用了區(qū)域活性方式。特別是Pt/ CuNWs和PtNTs（銅）的巨大區(qū)域活性，均遠(yuǎn)超美國(guó)能源部以前的目標(biāo)，超過(guò)2.1倍，Pt / C超過(guò)6.2倍，達(dá)到了BPPT活性的77％。鉑/ CuNWs和PtNTs（Cu）的進(jìn)一步突破PtNTs（銀）的區(qū)域活性，超過(guò)43％。 15。電子調(diào)諧很大程度決定Pt/ CuNWs和PtNTs（銅）的高區(qū)域活性。鉑層內(nèi)的CuNW模板及銅合金引入壓應(yīng)變，拉大了鉑的d帶和使中心遠(yuǎn)離費(fèi)米能級(jí);d帶中心偏移減弱氧的化學(xué)吸附，提高氧還原活性。 21 鉑銅系統(tǒng)的d帶效應(yīng)以前證實(shí)如下：鉑殼上的Pt Cu納米銅顆粒;22 銅上鉑覆層;23，鉑銅合金。23 |
3樓2013-11-28 23:14:00
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