【摘 要】
：
A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theo retical energy density.Currently,it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen re
【机 构】
：
Key Laboratory of Sensor and Sensing Technology, Gansu Academy of Sciences, Lanzhou 730000, Gansu, C
论文部分内容阅读
A Zn-air battery is a potential next-generation energy storage device owing to its extremely high theo retical energy density.Currently,it is important to explore non-precious metal electrocatalysts with high electroactivity and stability in the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for the development of Zn-air batteries.In this work,porous (Ni,Co)Se2 nanosheets were synthesized by selenizing NiCo2O4 nanosheets.By regulating the conductivity and morphology of the sample,the pre pared porous (Ni,Co)Se2 nanosheets show enhanced electrocatalytic activity for OER and ORR compared to NiCo2O4 nanosheets.The aqueous Zn-air battery using porous (Ni,Co)Se2 nanosheets as the air cathode exhibits superior charge and discharge performance (1.98V for charging and 1.17V for discharging),high specific capacity (770 mAh/g),and excellent cycle stability (140h).These results indicate that the porous (Ni,Co)Se2 nanosheets are suitable as a bifunctional electrocatalyst for future Zn-air batteries.
其他文献
The development of high-performance electrocatalysts holds the decisive key to the electrochemical CO2 reduction toward value-added products.Formic acid or formate is a desirable reduction product,but its selective production is often challenging.Tin base
An OH--slow-release strategy was established to controllably tune the (α-and β-) phase of nickel cobalt binary hydroxide in the presence of ammonium chloride.Ammonium chloride is added to the ionic solution to regulate the pH of the solution and slow down
It is of significance to design of stable and cost-effective electrocatalyst for water splitting with high efficiency in an alkaline medium. The major obstacles for practical application of water splitting devices are lack of high-efficiency and low-cost
Developing high-performance non-precious metal electrocatalysts for oxygen reduction reaction (ORR) is crucial for the commercialization of fuel cells and metal-air batteries.However,doped carbon-based materials only show good ORR activity in alkaline med
With the increasing demand for large-scale battery systems in electric vehicles (EVs) and smart renewable energy grids,organic materials including small molecules and polymers utilized as electrodes in rechargeable batteries have received increasing attra
The uniformly dispersed transition metal (Co,Ni and Fe) nanoparticles supported on the surface of La-promoted MgO were prepared via a deposition-precipitation method for hydrogen production from catalytic decomposition of ammonia.X-ray diffraction,N2 adso
In this work,the hydrogen sorption properties of the LiBH4-Mg2NiH4 composite system with the molar ratio 2∶2.5 were thoroughly investigated as a function of the applied temperature and hydrogen pressure.To the best of our knowledge,it has been possible to
Cubic phase Li7La3Zr2O12 (LLZO),a member of the Li-Garnet family,is a promising solid electrolyte and has been widely studied in recent years.However,LLZO samples prepared via conventional ambient air sintering reported in the published literature often c
Asphaltenes,complex aromatic compounds from various carbonaceous sources,could be obtained by solvent dissolution,filtration and adsorption.It was difficult to clarify the molecular structures and chemical properties of asphaltene due to its structural si
Solid sorbents with enhanced capacity and selectivity towards CO2 are crucial in the design of an efficient capture process.Among the possible alternatives,K2CO3-doped activated carbons have shown high CO2 capture capacity and rapid carbonation reaction r