Coupling a Low Loading of IrP2, PtP2, or Pd3P with Heteroatom-Doped Nanocarbon for Overall Water-Splitting Cells and Zinc-Air Batteries.
Coupling a Low Loading of IrP2, PtP2, or Pd3P with Heteroatom-Doped Nanocarbon for Overall Water-Splitting Cells and Zinc-Air Batteries.
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DOI：
10.1021/acsami.8b21155
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发表时间：
2019-04
影响因子：
9.5
通讯作者：
Qing Qin;Haeseong Jang;Lulu Chen;Ping Li;Tao Wei;Xien Liu;Jaephil Cho
中科院分区：
文献类型：
--
作者：
Qing Qin;Haeseong Jang;Lulu Chen;Ping Li;Tao Wei;Xien Liu;Jaephil Cho
贵金属基催化剂是目前最先进的电催化剂，适用于许多应用，例如能源转换和化学工业。由于贵金属成本高且稀缺，减少使用是实现可扩展应用的实用方法。在此，首次通过 IrCl4、PdCl2 或 PtCl4 与植酸的混合物在氨气氛下热解合成了三种由贵金属磷化物（IrP2、Pd3P 或 PtP2）纳米颗粒与 N,P 共掺杂纳米碳组成的新型电催化剂。通过在电极上超低负载 Pd (1.5 μg)、Pt (1.4 μg) 或 Ir (1.6 μg)，Pd3P/NPC、PtP2/NPC 和 IrP2/NPC 催化剂分别对氧还原反应、析氢反应和析氧反应表现出优异的三功能催化活性。值得注意的是，基于 IrP2/NPC、Pd3P/NPC 和 PtP2/NPC 的水分解电池分别只需要 1.62、1.65 和 1.68 V 即可提供 10 mA cm-2 的电流密度。此外，基于IrP2/NPC、Pd3P/NPC和PtP2/NPC的锌空气电池表现出比Pt/C更高的比容量。 IrP2/NPC 在可充电锌空气电池中表现出与 Pt/C-IrO2 相当的性能。
Noble metal-based catalysts are currently the most advanced electrocatalysts for many applications, such as for energy conversion and for chemical industry. Because of the high cost and scarcity of noble metals, reducing the usage is a practical way to achieve scalable applications. Herein, for the first time, three novel electrocatalysts composed of noble metal phosphide (IrP2, Pd3P, or PtP2) nanoparticles with N,P-codoped nanocarbon were synthesized by the pyrolysis of mixtures of IrCl4, PdCl2, or PtCl4 with phytic acid under an ammonia atmosphere. With an ultralow loading of Pd (1.5 μg), Pt (1.4 μg), or Ir (1.6 μg) on the electrode, the Pd3P/NPC, PtP2/NPC, and IrP2/NPC catalysts, respectively, exhibited excellent trifunctional catalytic activities for the oxygen reduction reaction, hydrogen evolution reaction, and oxygen evolution reaction. Notably, the IrP2/NPC-, Pd3P/NPC-, and PtP2/NPC-based water-splitting cells required only 1.62, 1.65, and 1.68 V, respectively, to deliver the current density of 10 mA cm-2. Furthermore, the IrP2/NPC-, Pd3P/NPC-, and PtP2/NPC-based zinc-air batteries exhibited higher specific capacities than that of Pt/C. IrP2/NPC exhibited a comparable performance to that of Pt/C-IrO2 for use in rechargeable zinc-air batteries.