Nanoporous Platinum/(Mn,AI)(3)O-4 Nanosheet Nanocomposites with Synergistically Enhanced Ultrahigh Oxygen Reduction Activity and Excellent Methanol Tolerance
Nanoporous Platinum/(Mn,AI)(3)O-4 Nanosheet Nanocomposites with Synergistically Enhanced Ultrahigh Oxygen Reduction Activity and Excellent Methanol Tolerance
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协同增强超高氧还原活性和优异甲醇耐受性的纳米孔铂/(Mn,Al)(3)O-4纳米片纳米复合材料
DOI：
10.1021/acsami.6b13840
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发表时间：
2017
影响因子：
9.5
通讯作者：
Zhang Zhonghua
中科院分区：
文献类型：
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作者：
Si Conghui;Zhang Jie;Wang Ying;Ma Wensheng;Gao Hui;Lv Lanfen;Zhang Zhonghua
目前，金属/金属氧化物复合材料被认为是潜在的氧还原反应（ORR）催化剂，用于能源相关的应用，如燃料电池。在这里，我们制作了一个高活性，低Pt负载ORR电催化剂组成的纳米多孔Pt（np-Pt）与层状（Mn，Al）3 O 4纳米片（NS）紧密接触。与Pt/C（约翰逊Matthey）催化剂相比，np-Pt/（Mn，Al）3 O 4 NS催化剂的质量标准化ORR活性提高了11.5倍，并且由于np-Pt和（Mn，Al）3 O 4之间的金属-载体相互作用，其甲醇耐受性更好。电化学实验与理论计算相结合证实了np-Pt/（Mn，Al）_3O_4NS催化剂在碱性溶液中的氧化还原反应是直接的4 e-途径。此外，电催化机制也已合理化的密度泛函理论（DFT）计算。
At present, metal/metal oxide composites are considered as potential oxygen reduction reaction (ORR) catalysts for energy-related applications like fuel cells. Here, we fabricated a high-activity, low Pt loading ORR electrocatalyst composed of nanoporous Pt (np-Pt) in intimate contact with lamellar (Mn,Al)3O4nanosheet (NS). In comparison to Pt/C (Johnson Matthey), the np-Pt/(Mn,Al)3O4NS catalyst shows a 11.5-fold enhancement in the mass-normalized ORR activity and much better methanol tolerance because of the metal–support interactions between np-Pt and (Mn,Al)3O4. Furthermore, the combination of electrochemical experiments with theoretical calculations verifies that the ORR on the np-Pt/(Mn,Al)3O4NS catalyst is a direct 4e–pathway in the alkaline solution. In addition, the electrocatalytic mechanisms have also been rationalized by density functional theory (DFT) calculations.