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| 13. Catalyst ECSAs were determined during cyclic voltammo- grams in an argon saturated 0.1 M HClO 4 electrolyte at a scan rate of 20 mV s−1 (Figure 2). ECSAs were calculated by the charge associated with hydrogen adsorption. ECSAs were further verified with the charge associated with carbon monoxide oxidation (Supporting Information, Figure S.5). Carbon monoxide oxidation voltammograms were performed by holding a potential of 0.2 V vs RHE for 20 min, the fi rst 10 min in a carbon monoxide saturated electrolyte (10% carbon monoxide, balance nitrogen) and the second 10 min in an argon saturated 0.1 M HClO 4 electrolyte; following potential holding, a voltammogram was immediately performed at 20 mV s−1 . ECSAs for Pt/CuNWs, PtNTs (Cu), PtNTs (Ag), and Pt/C were determined to be 5.5, 5.6, 15.2, and 60.1 m 2 g−1 ,respectively, on a total mass basis. On a Pt mass basis, Pt/CuNWs, PtNTs (Cu), PtNTs (Ag), and Pt/C had ECSAs of 30.6, 5.9, 15.7, and 60.1 m 2 g−1 , respectively. Pt/CuNWs had a much higher ECSA than PtNT (Cu) because of an increased Pt utilization. While PtNTs (Cu) had an 11 nm wall thickness, Pt/ CuNWs were estimated to have an approximate Pt coating of 2 nm. Cu was also unstable during cyclic voltammetry and ORR experiments because of a low dissolution potential; because of the ease of electrochemically removing Cu, it was unlikely that Pt/CuNWs contained Cu impurities on the surface during ORR testing. Complete removal of Cu was further con fi rmed by the lack of Cu features in the cyclic voltammograms. |
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13。催化劑的ECSA通過循環(huán)伏安法在氬氣飽和的0.1M高氯酸電解質(zhì)20毫伏每秒的掃描速率（圖2）條件下測(cè)定。 ECSA計(jì)算采用與氫吸附相關(guān)聯(lián)的電荷。ECSA通過一氧化碳氧化電荷（支持信息，圖S.5）進(jìn)一步驗(yàn)證。一氧化碳氧化伏安法為0.2伏的電位Vs20分鐘，最初的10分鐘在一氧化碳飽和的電解質(zhì)（10％的一氧化碳，氮平衡），然后10分鐘在氬氣飽和的0.1M高氯酸電解質(zhì);然后保持電位，立即在20 mV每秒進(jìn)行伏安法測(cè)定。以總質(zhì)量計(jì)算，鉑/ CuNWs，PtNTs（Cu），PtNTs（Ag）和鉑/ C的ECSA分別為5.5，5.6，15.2，60.1m2每克。以Pt質(zhì)量計(jì)，鉑/ CuNWs，PtNTs（Cu），PtNTs（Ag）和鉑/ C的ECSA分別為30.6 ECSAs，5.9，15.7，和60.1m2每克。因?yàn)樵黾恿烁嗟腜t,Pt / CuNWs的ECSA比PTNT（銅）高得多。雖然PtNTs（銅）11納米的厚壁，鉑/ CuNWs有約2納米鉑涂層。因?yàn)榈腿芙怆娢谎h(huán)伏安法和ORR實(shí)驗(yàn)，銅也是不穩(wěn)定的。因?yàn)殡娀瘜W(xué)去除銅極容易，Pt/ CuNWs在ORR測(cè)定過程中表面含有銅雜質(zhì)是不可能的。Cu的完全去除經(jīng)無銅特征循環(huán)伏安圖得以證實(shí)。 adsorption似乎應(yīng)為absorption , m 2 g−1中的2似乎應(yīng)為平方。 |
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