材料科学
催化作用
分解水
钌
氧气
铑
电极
热解
锌
无机化学
碳纤维
析氧
氢
物理化学
电化学
化学
有机化学
冶金
复合数
光催化
复合材料
作者
Qing Qin,Haeseong Jang,Lulu Chen,Gyutae Nam,Xien Liu,Jaephil Cho
标识
DOI:10.1002/aenm.201801478
摘要
Abstract Reducing the consumption of noble metals in energy devices, such as fuel cells, zinc–air batteries, and water splitting cells, is a core issue for achieving an environmentally sustainable society. Herein, two highly efficient electrocatalysts are synthesized, composed of N, P codoped carbon (NPC) modified with noble metals phosphides (Rh x P/NPC and RuP/NPC) through pyrolysis of a mixture of RhCl 3 · x H 2 O or RuCl 3 · x H 2 O, respectively, with phytic acid. Unlike the reported rhodium and ruthenium phosphides, Rh x P/NPC and RuP/NPC have a low loading of Rh (≈0.4 wt%) and Ru (≈0.5 wt%) and yet still exhibit excellent trifunctional activities for oxygen reduction, oxygen evolution, and hydrogen evolution reactions. For hydrogen evolution, Rh x P/NPC shows a Pt‐like activity and excellent durability in acidic medium. Notably, RuP/NPC becomes more active after 2000 cycles in the durability test. For oxygen reduction, both of the catalysts show a half‐wave potential of 0.89 V, which is positively shifted 40 mV relative to that of Pt/C (0.85 V) in 0.1 m KOH. In addition, Rh x P/NPC and RuP/NPC also exhibit activities superior to that of IrO 2 in oxygen evolution. Finally, zinc–air batteries and water splitting cells assembled with Rh x P/NPC and RuP/NPC catalysts display good performance.
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