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Graphene Composites with Cobalt Sulfide: Efficient Trifunctional Electrocatalysts for Oxygen Reversible Catalysis and Hydrogen Production in the Same Electrolyte.
| Content Provider | Semantic Scholar |
|---|---|
| Author | Biancacci, Nicolò Li, Ligui Zhao, Dengke Kang, Xiongwu Tang, Zhenghua Chen, Shaowei |
| Copyright Year | 2017 |
| Abstract | Nitrogen and sulfur-codoped graphene composites with Co9 S8 (NS/rGO-Co) are synthesized by facile thermal annealing of graphene oxides with cobalt nitrate and thiourea in an ammonium atmosphere. Significantly, in 0.1 m KOH aqueous solution the best sample exhibits an oxygen evolution reaction (OER) activity that is superior to that of benchmark RuO2 catalysts, an oxygen reduction reaction (ORR) activity that is comparable to that of commercial Pt/C, and an overpotential of only -0.193 V to reach 10 mA cm-2 for hydrogen evolution reaction (HER). With this single catalyst for oxygen reversible electrocatalysis, a potential difference of only 0.700 V is observed in 0.1 m KOH solution between the half-wave potential in ORR and the potential to reach 10 mA cm-2 in OER; in addition, an overpotential of only 450 mV is needed to reach 10 mA cm-2 for full water splitting in the same electrolyte. The present trifunctional catalytic activities are markedly better than leading results reported in recent literature, where the remarkable trifunctional activity is attributed to the synergetic effects between N,S-codoped rGO, and Co9 S8 nanoparticles. These results highlight the significance of deliberate structural engineering in the preparation of multifunctional electrocatalysts for versatile electrochemical reactions. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://chen.chemistry.ucsc.edu/TriCat-CoS.pdf |
| PubMed reference number | 28692744v1 |
| Alternate Webpage(s) | https://doi.org/10.1002/smll.201701025 |
| DOI | 10.1002/smll.201701025 |
| Journal | Small |
| Volume Number | 13 |
| Issue Number | 33 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Ammonium C4A gene Carbon Dioxide Cobalt Composition Cyclic N-Oxides Ehlers-Danlos Syndrome Electrons Exhibits as Topic Graphene H-NS complex High Resolution Transmission Electron Microscopy Kidney Diseases MT-CO1 gene Maxillary right second molar prosthesis Nitrogen Oxides Oxygen PSPHP1 gene PersonNameUse - assigned Potassium Hydroxide Ravens colored progressive matrices Sulfides Supernumerary maxillary right third molar TBX1 wt Allele Thiourea Wash (cleansing action) X-Ray Photoelectron Spectroscopy cobaltous nitrate cobaltous sulfide contents - HtmlLinkType negative regulation of hydrogen sulfide biosynthetic process newton |
| Content Type | Text |
| Resource Type | Article |
