22 research outputs found
AuCu Aerogels with Intriguing Surface Electronic Modulation as Highly Active and Stable Electrocatalysts for Oxygen Reduction and Borohydride Oxidation
Highly active and stable AuNi dendrites as an electrocatalyst for the oxygen reduction reaction in alkaline media
AuNi hierarchical dendrites were fabricated by a facile electrodeposition and dealloying method with exceptional ORR activity and remarkable long-term stability.</p
Mutations in epidermal growth factor receptor and K-ras in Chinese patients with colorectal cancer
Effects of water molecules on tribological behavior and property measurements in nano-indentation processes - a numerical analysis
Tuning electronic and composition effects in ruthenium-copper alloy nanoparticles anchored on carbon nanofibers for rechargeable Li-CO<sub>2</sub> batteries
The complete chloroplast genome of Cratoxylum cochinchinense (Hypericaceae)
Cratoxylum cochinchinense (Lour.) Blume is a tropical Asia specie limited distributed from South China to Borneo. The complete chloroplast genome of the species was found to be 157,103âbp in length, with 129 unique genes, including 37 tRNA, eight rRNA, and 84 protein-coding genes. The GC content of C. cochinchinense is 36.2%. As the first complete chloroplast genome in Hypericaceae, it shows the phylogenetic relationship within Malphigiales
Dilute Au-Containing Ag Nanosponges as a Highly Active and Durable Electrocatalyst for Oxygen Reduction and Alcohol Oxidation Reactions
Zero-dimensional
nanoparticles (NPs) have been demonstrated as the promising class
of catalysts for various chemical and electrochemical reactions. However,
the emerging AuâAg NP catalysts suffer from single functionality,
limited activity enhancement, and unsatisfactory stability problems.
Here, we report a facile kinetically controlled solution method to
prepare a new class of AuâAg nanoporous sponges (NSs) composed
of three-dimensional networks without using additional stabilizing
agents at room temperature. The unexpected shift of the d-band center
in our AuâAg NSs was observed for the first time in AuâAg
bimetallic systems, which effectively activates the AuâAg NSs
for electrochemical reactions. The robust electronic effect coupled
with abundant accessible active sites from the hierarchically porous
architecture make the bare AuâAg NSs a superior multifunctional
catalyst for oxygen reduction, ethylene glycol (EG) oxidation, and
glucose oxidation reactions compared to the commercial Pt/C electrocatalyst
in alkaline medium. The optimized AuAg<sub>3.2</sub> NSs deliver a
mass activity of 1.26 A mg<sub>Au</sub><sup>â1</sup> toward
oxygen reduction reaction, which is âź8.2 times as high as that
of the Pt/C electrocatalyst, simultaneously showing outstanding stability
with negligible activity decay after 10 000 cycles. For the anodic
reactions, these AuAg<sub>3.2</sub> NSs show extremely high activity
and stability toward both EG and glucose catalytic oxidation reactions
with a higher mass activity of 7.58 and 1.48 A mg<sub>Au</sub><sup>â1</sup>, about 3- and 18.5-fold enhancement than Pt/C, respectively.
This work provides important insights into the structural design,
performance optimization, and cost reduction to promote the practical
applications of liquid fuel cells
A Turbulent Mass Diffusivity Model for Predicting Species Concentration Distribution in the Biodegradation of Phenol Wastewater in an Airlift Reactor
In this study, a three-dimensional CFD transient model is established for predicting species concentration distribution in the biodegradation of phenol in an airlift reactor (ALR). The gasâliquid flow in the ALR is determined by the EulerâEuler method coupled with the standard k-Îľ model, and the bubble size is predicted by the population balance model (PBM). A turbulent mass diffusivity model is developed to simulate the turbulent mass transfer process and to predict the species concentration distribution. No empirical methods are needed as the turbulent mass diffusivity can be expressed by the concentration variance c2ÂŻ and its dissipation rate Îľc. A good agreement is found between simulated and experimental results in the literature. It is not reasonable to assume a constant turbulent Schmidt number because the calculated distribution of turbulent mass diffusivity is not identical to that of turbulent viscosity. Finally, the hydrodynamic characteristics and biodegradation performance of the proposed model in a novel ALR are compared with that in the original ALR