National Renewable Energy Laboratory , Golden, Colorado 80401, United States.
ACS Appl Mater Interfaces. 2017 Feb 1;9(4):3785-3791. doi: 10.1021/acsami.6b15725. Epub 2017 Jan 18.
The development of catalytic materials for the hydrogen oxidation, hydrogen evolution, oxygen reduction or oxygen evolution reactions with high reaction rates and low overpotentials are key goals for the development of renewable energy. We report here Ru(0) nanoclusters supported on nitrogen-doped graphene as high-performance multifunctional catalysts for the hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR), showing activities similar to that of commercial Pt/C in alkaline solution. For HER performance in alkaline media, sample Ru/NG-750 reaches 10 mA cm at an overpotential of 8 mV with a Tafel slope of 30 mV dec. The high HER performance in alkaline solution is advantageous because most catalysts for ORR and oxygen evolution reaction (OER) also prefer alkaline solution environment whereas degrade in acidic electrolytes. For ORR performance, Ru/NG effectively catalyzes the conversion of O into OH via a 4e process at a current density comparable to that of Pt/C. The unusual catalytic activities of Ru(0) nanoclusters reported here are important discoveries for the advancement of renewable energy conversion reactions.
开发具有高反应速率和低过电位的用于氢气氧化、氢气析出、氧气还原或氧气析出反应的催化材料是开发可再生能源的关键目标。我们在此报告了负载在氮掺杂石墨烯上的 Ru(0)纳米簇作为高效多功能催化剂，用于在碱性溶液中具有与商业 Pt/C 相似活性的析氢反应 (HER) 和氧还原反应 (ORR)。对于碱性介质中的 HER 性能，样品 Ru/NG-750 在 8 mV 的过电势下达到 10 mA cm，塔菲尔斜率为 30 mV dec。在碱性溶液中具有高 HER 性能是有利的，因为大多数用于 ORR 和氧气析出反应 (OER) 的催化剂也更喜欢碱性溶液环境，而在酸性电解质中会降解。对于 ORR 性能，Ru/NG 通过 4e 过程有效地将 O 催化转化为 OH，其电流密度可与 Pt/C 相媲美。这里报道的 Ru(0)纳米簇的异常催化活性是推进可再生能源转化反应的重要发现。
