Back to Search
Start Over
Single-iron, cobalt, nickel, and copper-atom catalysts for the selective reduction of oxygen to H2O2.
- Source :
- Green Chemistry; 5/21/2023, Vol. 25 Issue 10, p3931-3939, 9p
- Publication Year :
- 2023
-
Abstract
- The pursuit of hydrogen peroxide (H<subscript>2</subscript>O<subscript>2</subscript>) production via two-electron electrochemical oxygen reduction reaction (ORR) is hampered by the lack of high-performance electrocatalysts. In this work, a series of single metal (i.e., Fe, Co, Ni, and Cu) atom catalysts anchored into N-doped carbon nanosheets (NCNSs) are evaluated for H<subscript>2</subscript>O<subscript>2</subscript> production at pH-universal electrolytes. The catalytic performance of the samples, including current density, H<subscript>2</subscript>O<subscript>2</subscript> selectivity, turnover of frequency (TOF), and faradaic efficiency, are characterized by electrochemical measurements. The generation of H<subscript>2</subscript>O<subscript>2</subscript> is monitored by a UV-vis spectrophotometer. Among the samples, Cu/NCNSs exhibits the best catalytic performance with a ring current density of 2.15 mA cm<superscript>−2</superscript>, TOF of 15.8 s<superscript>−1</superscript> at 0.1 V vs. reversible hydrogen electrode, Tafel slope of 88 mV dec<superscript>−1</superscript>, and H<subscript>2</subscript>O<subscript>2</subscript> selectivity of 100% at 0.57 V in alkaline media. Importantly, the Cu/NCNSs yields H<subscript>2</subscript>O<subscript>2</subscript> selectivity of 81% at 0.05 V in acidic electrolytes. In contrast, Cu nanoparticles possess an inferior current density and much lower H<subscript>2</subscript>O<subscript>2</subscript> selectivity via the 4e<superscript>−</superscript> ORR pathway. Further quantitative analysis of H<subscript>2</subscript>O<subscript>2</subscript> demonstrates that the Cu/NCNSs catalyst has an H<subscript>2</subscript>O<subscript>2</subscript> production rate of 5.1 mol g<subscript>catalyst</subscript><superscript>−1</superscript> L<superscript>−1</superscript> h<superscript>−1</superscript> in alkaline media at 0.4 V, which is larger than those in acidic media (3.2 mol g<subscript>catalyst</subscript><superscript>−1</superscript> L<superscript>−1</superscript> h<superscript>−1</superscript>) and neutral media (2.2 mol g<subscript>catalyst</subscript><superscript>−1</superscript> L<superscript>−1</superscript> h<superscript>−1</superscript>) at −0.2 V. Such performance of Cu/NCNSs renders it as one of the best catalysts for H<subscript>2</subscript>O<subscript>2</subscript> production. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 14639262
- Volume :
- 25
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Green Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 163854984
- Full Text :
- https://doi.org/10.1039/d3gc00737e