Coupling Ultrafine Pt Nanocrystals over the Fe2P Surface as a Robust Catalyst for Alcohol Fuel Electro-Oxidation.
Coupling Ultrafine Pt Nanocrystals over the Fe2P Surface as a Robust Catalyst for Alcohol Fuel Electro-Oxidation.
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DOI：
10.1021/acsami.8b18029
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发表时间：
2019-02
影响因子：
9.5
通讯作者：
Fulong Wang;Bo Fang;Xu Yu;Ligang Feng
中科院分区：
文献类型：
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作者：
Fulong Wang;Bo Fang;Xu Yu;Ligang Feng
在花瓣状Fe2P表面偶联的平均粒径为2.2±1 nm的超细铂纳米晶被认为是一种新型、高效、耐用的乙醇燃料电氧化催化剂。根据d带理论，金属-载体的强耦合效应使Fe2P和铂界面之间产生了强烈的电子相互作用，从而削弱了中毒CO物种的吸附。花瓣状Fe2P的缺陷和比表面积的增加有利于铂纳米粒子的锚定和分散，以及电化学反应中的电荷转移和反应物的传输。这些特点使得铂-Fe2P催化剂体系对甲醇和乙醇的乙醇燃料电氧化具有良好的催化活性、抗中毒能力和催化稳定性，与可控的铂/碳催化剂相比。高的催化效率是由于铂和花瓣状Fe2P界面的强耦合作用，可以保持催化剂体系的机械和化学稳定性。这种磷化物负载的超细铂纳米晶将成为燃料电池中很有前途的催化剂。
Ultrafine Pt nanocrystals with an average particle size of 2.2 ± 1 nm coupled over the petaloid Fe2P surface are proposed as a novel, efficient, and robust catalyst for alcohol fuel electro-oxidation. The strong coupling effect of metal-support imparts a strong electronic interaction between the Fe2P and Pt interface that can weaken the adsorption of poisoning CO species according to the d-band theory. Defects and increased surface area of the petaloid Fe2P are beneficial to the Pt nanoparticle anchoring and dispersion as well as the charge transfer and reactant transportation during the electrochemical reaction. These features make the Pt-Fe2P catalyst system exhibit excellent catalytic activity, antipoisoning ability, and catalytic stability for alcohol fuel of methanol and ethanol electro-oxidation compared with a controlled Pt/C catalyst. The high catalytic efficiency is proposed to come from the strong coupling effect of Pt and petaloid Fe2P interface that can maintain the mechanical and chemical stability of the catalyst system. This kind of phosphide-supported ultrafine Pt nanocrystals will be a promising catalyst in fuel cells.