Cu NPs-embedded cross-linked microporous 3D reduced graphene hydrogels as photocatalyst for hydrogen evolution
| Autor: | Jiaxin Chen, Hongyan Liu, Gary Histand, Dan Wu, Wangxi Liu, Tingting Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Reducing agent Oxide 02 engineering and technology Microporous material 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Biomaterials chemistry.chemical_compound Colloid and Surface Chemistry chemistry Chemical engineering law Self-healing hydrogels Photocatalysis Surface plasmon resonance 0210 nano-technology Hydrogen production |
| Zdroj: | Journal of colloid and interface science. 577 |
| ISSN: | 1095-7103 |
| Popis: | Three-dimensionally (3D) structured Cu nanoparticles (NPs)-embedded graphene hydrogels were synthesized from inexpensive graphite and low-cost copper acetate by a novel self-assembly and in-situ slow-release photoreduction method. The cross-linked microporous 3D reduced graphene oxide framework ensures full contact of the photocatalyst with water and promotes electron transfer. The EDA-reduced Cu-rGH hydrogel with an 11.3% Cu NPs mass ratio exhibits the best hydrogen evolution rate (16.92 mmol·g−1·h−1). This rate is almost 17 times faster than pure Cu NPs. EDA played an important role in both forming a hydrogel as the reducing agent and slowly releasing Cu NPs as a ligand in the process of in-situ photoreduction, allowing small sized and uniformly distributed Cu NPs. Therefore, the number of reaction sites in the composite increases and the recombination of photoinduced electron-hole pairs in Cu NPs decreases. Under irradiation, the SPR-excited (surface plasmon resonance) hot electrons from Cu NPs quickly transfer through the rGH channel. 3D rGH was found to be a promising substrate for boosting hydrogen production by Cu NPs. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect