Bimetallic nickel-molybdenum/tungsten nanoalloys for high-efficiency hydrogen oxidation catalysis in alkaline electrolytes.
Bimetallic nickel-molybdenum/tungsten nanoalloys for high-efficiency hydrogen oxidation catalysis in alkaline electrolytes.
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DOI：
10.1038/s41467-020-18585-4
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发表时间：
2020-09-22
影响因子：
16.6
通讯作者：
Yu SH
中科院分区：
文献类型：
--
作者：
Duan Y;Yu ZY;Yang L;Zheng LR;Zhang CT;Yang XT;Gao FY;Zhang XL;Yu X;Liu R;Ding HH;Gu C;Zheng XS;Shi L;Jiang J;Zhu JF;Gao MR;Yu SH
氢氧化物交换膜燃料电池提供了采用无铂族金属催化剂来克服缓慢的氧还原反应的可能性。不幸的是，铂上的超快氢氧化反应（HOR）通过将电解质从酸切换到碱而降低至少两个数量级，从而导致高铂族金属负载。在这里，我们表明，镍-钼纳米合金与tetraxylMoNi 4相可以有效地催化在碱性电解液中的HOR。该催化剂表现出3.41毫安/平方厘米的高表观交换电流密度，并且非常稳定，这是最新技术的Pt/C催化剂的1.4倍。有了这种催化剂，我们进一步证明了耐受一氧化碳中毒的能力。在类似设计的WNi 4催化剂上也观察到显著的HOR活性。我们将这种显著的HOR反应性归因于合金效应，该合金效应使得氢在镍上和羟基在钼（钨）上的最佳吸附成为可能，这协同促进了Volmer反应。氢氧化反应（HOR）催化剂的缺乏阻碍了氢氧化物交换膜燃料电池的应用。在此，作者报道了在碱中具有显著HOR活性的MoNi 4和WNi 4纳米合金，其中MoNi 4优于Pt/C催化剂。
Hydroxide exchange membrane fuel cells offer possibility of adopting platinum-group-metal-free catalysts to negotiate sluggish oxygen reduction reaction. Unfortunately, the ultrafast hydrogen oxidation reaction (HOR) on platinum decreases at least two orders of magnitude by switching the electrolytes from acid to base, causing high platinum-group-metal loadings. Here we show that a nickel-molybdenum nanoalloy with tetragonal MoNi4 phase can catalyze the HOR efficiently in alkaline electrolytes. The catalyst exhibits a high apparent exchange current density of 3.41 milliamperes per square centimeter and operates very stable, which is 1.4 times higher than that of state-of-the-art Pt/C catalyst. With this catalyst, we further demonstrate the capability to tolerate carbon monoxide poisoning. Marked HOR activity was also observed on similarly designed WNi4 catalyst. We attribute this remarkable HOR reactivity to an alloy effect that enables optimum adsorption of hydrogen on nickel and hydroxyl on molybdenum (tungsten), which synergistically promotes the Volmer reaction. The lack of efficient and cost-effective catalysts for hydrogen oxidation reaction (HOR) hampers the application of hydroxide exchange membrane fuel cells. Here, authors reported bimetallic MoNi4 and WNi4 nanoalloys with marked HOR activity in alkali, among which MoNi4 outperforms the Pt/C catalyst.
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影响因子：
41.2
作者：
Chattot R;Le Bacq O;Beermann V;Kühl S;Herranz J;Henning S;Kühn L;Asset T;Guétaz L;Renou G;Drnec J;Bordet P;Pasturel A;Eychmüller A;Schmidt TJ;Strasser P;Dubau L;Maillard F
通讯作者：
Maillard F
影响因子：
3.7
作者：
Funke, H;Scheinost, AC;Chukalina, M
通讯作者：
Chukalina, M
影响因子：
16.6
作者：
Ni, Weiyan;Krammer, Anna;Hu, Xile
通讯作者：
Hu, Xile
用于乙醇电氧化的超薄Pt-Mo-Ni纳米线催化剂的设计
影响因子：
13.6
作者：
Mao J;Chen W;He D;Wan J;Pei J;Dong J;Wang Y;An P;Jin Z;Xing W;Tang H;Zhuang Z;Liang X;Huang Y;Zhou G;Wang L;Wang D;Li Y
通讯作者：
Li Y
影响因子：
56.9
作者：
Helm, Monte L.;Stewart, Michael P.;DuBois, Daniel L.
通讯作者：
DuBois, Daniel L.