期刊
DALTON TRANSACTIONS
卷 49, 期 29, 页码 10250-10260出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0dt02096f
关键词
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资金
- European Structural and Investment Funds (FEEI) through - Programa operacional Competitividade e Internacionalizacao - COMPETE2020 [POCI-01-0145-FEDER-16422]
- national funds through FCT - Fundacao para a Ciencia e a Tecnologia, I.P.
- FCT [PTDC/QUI-QIN/30649/2017, UID/QUI/50006/2013-POCI/01/0145/FEDER/007265]
In the last decade we have witnessed increasing interest in the production of renewable energy and value-added chemicals through sustainable and low-cost technologies where catalysts play a crucial role. Herein, we report the application of a Ru/CNT material containing a mixture of Ru single atoms and Ru nanoparticles as a multifunctional catalyst for both the catalytic reduction of nitroarenes and the electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The catalytic activity of the Ru-CNT material was evaluated in the reduction of 4-nitrophenol (4-NP), 4-nitroaniline (4-NA) and 2-nitrophenol (2-NP) in the presence of sodium borohydride as a reducing agent at room temperature, showing high catalytic activity with normalized rate constants (k(nor)) of 19.0 x 10(3), 57.7 x 10(3)and 16.6 x 10(3)min(-1)mmol(-1)respectively. Furthermore, the catalyst could be reused in at least 10 cycles without catalytic activity loss, confirming the high stability and robustness of the material. The Ru/CNT material also showed good ORR electrocatalytic activity in alkaline medium withE(onset)of 0.76 Vvs.RHE, a diffusion-limited current density of 3.89 mA cm(-2)andn(O2)of 3.3. In addition, Ru/CNT was remarkably insensitive to methanol with a current retention of 93% (51% for Pt/C) and competitive electrochemical stability of 80% after 20 000 s. Moreover, Ru/CNT was active for the OER withj(max)= 29.5 mA cm(-2)atE= 1.86 Vvs.RHE,eta(10)= 0.50 V and good stability (eta(10)changed to 0.01 V andj(max)only decreased by approximate to 12% after 500 cycles).
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