Optimizing the Size of Platinum Nanoparticles for Enhanced Mass Activity in the Electrochemical Oxygen Reduction Reaction
Optimizing the Size of Platinum Nanoparticles for Enhanced Mass Activity in the Electrochemical Oxygen Reduction Reaction
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DOI：
10.1002/anie.201904492
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发表时间：
2019-07-08
影响因子：
16.6
通讯作者：
Fischer, Roland A.
中科院分区：
文献类型：
--
作者：
Garlyyev, Batyr;Kratzl, Kathrin;Fischer, Roland A.
高氧还原（ORR）活性多年来一直被认为是许多能源应用的关键。在此，通过理论和实验相结合，我们制备了具有最佳尺寸的Pt纳米颗粒，用于质子交换膜燃料电池中的有效ORR。通过计算筛选，预测最佳纳米颗粒尺寸接近1、2和3 nm。为了证实我们的计算结果，我们已经解决了约1 nm大小的Pt纳米粒子的合成与金属有机框架（MOF）模板的方法的挑战。采用HR-TEM、XPS等手段对催化剂进行了表征，并采用旋转圆盘电极装置测定了催化剂的ORR活性。观测到的质量活度（0.87 +/- 0.14Amg（Pt）（-1））接近计算预测值（0.99Amg（Pt）（-1））。我们报告了迄今为止最高的质量活性纯Pt催化剂的ORR在类似的大小范围内。比活性和质量活性是Tanaka商业Pt/C催化剂的两倍。
High oxygen reduction (ORR) activity has been for many years considered as the key to many energy applications. Herein, by combining theory and experiment we prepare Pt nanoparticles with optimal size for the efficient ORR in proton-exchange-membrane fuel cells. Optimal nanoparticle sizes are predicted near 1, 2, and 3nm by computational screening. To corroborate our computational results, we have addressed the challenge of approximately 1nm sized Pt nanoparticle synthesis with a metal-organic framework (MOF) template approach. The electrocatalyst was characterized by HR-TEM, XPS, and its ORR activity was measured using a rotating disk electrode setup. The observed mass activities (0.87 +/- 0.14Amg(Pt)(-1)) are close to the computational prediction (0.99Amg(Pt)(-1)). We report the highest to date mass activity among pure Pt catalysts for the ORR within similar size range. The specific and mass activities are twice as high as the Tanaka commercial Pt/C catalysis.