Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 18, Pages 16461-16473Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b21155
Keywords
multifunctional electrocatalysts; nanocarbon; noble metal phosphides; water-splitting cells; zinc-air batteries
Funding
- Taishan Scholar Program of Shandong Province, China [ts201712045]
- Key Research and Development Program of Shandong Province [2018GGX104001]
- Natural Science Foundation of Shandong Province of China [ZR2017MB054, ZR2018BB008]
- Chinese Postdoctral Science Foundation [2018M642623]
- Ulsan National Institute of Science and Technology (UNIST) [1.180036.01]
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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 mu g), Pt (1.4 mu g), or Ir (1.6 mu g) on the electrode, the Pd3P/NPC, PtP2/NPC, and IrP2/NPC catalysts, respectively, exhibited excellent trifunctional catalytic 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.
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