Publications by authors named "Fenyang Tian"
The lattice oxygen mechanism (LOM) endows NiFe layered double hydroxide (NiFe-LDH) with superior oxygen evolution reaction (OER) activity, yet the frequent evolution and sluggish regeneration of lattice oxygen intensify the dissolution of active species. Herein, we overcome this challenge by constructing the NiFe hydroxide/NiMo alloy (NiFe-LDH/NiMo) heterojunction electrocatalyst, featuring the NiMo alloy as the oxygen pump to provide oxygenous intermediates and electrons for NiFe-LDH. The released lattice oxygen can be timely offset by the oxygenous species during the LOM process, balancing the regeneration of lattice oxygen and assuring the enhancement of the durability.
View Article and Find Full Text PDFAlloying has significantly upgraded the oxygen reduction reaction (ORR) of Pd-based catalysts through regulating the thermodynamics of oxygenated intermediates. However, the unsatisfactory activation ability of Pd-based alloys toward O molecules limits further improvement of ORR kinetics. Herein, the precise synthesis of nanosheet assemblies of spin-polarized PdCu-FeO in-plane heterostructures for drastically activating O molecules and boosting ORR kinetics is reported.
View Article and Find Full Text PDFArticle Synopsis
- Researchers developed a new type of nanosheet catalyst, Mo-PdPtNiCuZn, which combines single-atom and high-entropy-alloy features for better energy conversion in electrocatalysis.
- The catalyst showed impressive performance in methanol oxidation, achieving a high mass activity and excellent durability.
- The combination of Mo single atoms and tensile strain optimizes the catalyst's structure, improving reaction pathways and reducing barriers, making it a promising solution for CO-tolerant electrocatalysts.
Rationally designing broad-spectrum photocatalysts to harvest whole visible-light region photons and enhance solar energy conversion is a "holy grail" for researchers, but is still a challenging issue. Herein, based on the common polymeric carbon nitride (PCN), a hybrid co-catalysts system comprising plasmonic Au nanoparticles (NPs) and atomically dispersed Pt single atoms (PtSAs) with different functions was constructed to address this challenge. For the dual co-catalysts decorated PCN (PtSAs-Au/PCN), the PCN is photoexcited to generate electrons under UV and short-wavelength visible light, and the synergetic Au NPs and PtSAs not only accelerate charge separation and transfer though Schottky junctions and metal-support bond but also act as the co-catalysts for H evolution.
View Article and Find Full Text PDFArticle Synopsis
- A new hierarchical Z-scheme photocatalyst, MnO/MnInS (MISO), was developed for effectively reducing Cr(VI) in wastewater across a wide pH range.
- The optimized 2.0-MISO photocatalyst achieved nearly 100% reduction efficiency in a pH range of 2.1-5.6 under visible light, significantly outperforming its pure components.
- The catalyst also demonstrated high efficiency in reducing Cr(VI) in actual industrial wastewater and showed promise under natural light conditions, while DFT calculations confirmed the connection between its components and proposed a photocatalytic mechanism.
Article Synopsis
- Medium-entropy alloy aerogels (MEAAs) combine the benefits of multimetallic alloys and aerogels, making them promising for catalytic applications despite challenges in achieving a single-phase structure.
- A new strategy for creating ultralight 3D porous MEAAs with a density of just 39.3 mg/cm³ is introduced, utilizing auto-combustion and low-temperature reduction to ensure proper mixing of metal precursors.
- These MEAAs demonstrate superior catalytic performance in methanol oxidation, showcasing high activity levels and enabling a more efficient methanol-oxidation-assisted water electrolyzer that operates at a significantly lower voltage than traditional systems.
Ultrathin nanosheet catalysts deliver great potential in catalyzing the oxygen reduction reaction (ORR), but encounter the ceiling of the surface atomic utilizations, thus presenting a challenge associated with further boosting catalytic activity. Herein, a kind of PdPtCu ultrathin nanorings with increased numbers of electrocatalytically active sites is reported, with the purpose of breaking the activity ceiling of conventional catalysts. The as-made PdPtCu nanorings possess abundant high-index facets at the edge of both the exterior and interior surfaces.
View Article and Find Full Text PDFNanoarray catalysts supported on substrates provide an opportunity for industrially promising overall water splitting at large current densities. However, most of the present electrocatalysts show high overpotentials at a large current density, inducing a low efficiency for industrial water electrolysis. Herein, using the classic NiCoP nanorod arrays as the basic catalyst model, we presented a trace W and Mo co-doped strategy to boost the overall water splitting electrocatalysis at an industrial current density.
View Article and Find Full Text PDFArticle Synopsis
- The sluggish kinetics of the anodic oxygen evolution reaction (OER) in electrochemical hydrogen production can hinder sustainable energy development.
- Researchers developed a hybrid catalyst made from mesoporous cobalt ferrite phosphides on reduced graphene oxide (rGO) through a simple method, allowing for more active sites and improved electron and ion flow.
- The new catalyst (mCoFeP/rGO) demonstrates excellent performance with low overpotential and high stability, making it a promising option for efficient OER and water splitting in electrolyzers.