Ligand-Bound CO as a Nonclassical Route toward Efficient Photocatalytic CO Reduction with a Ni N-Confused Porphyrin.

Implementing the synergistic effects between the metal and the ligand has successfully streamlined the energetics for CO activation and gained high catalytic activities, establishing the important breakthroughs in photocatalytic CO reduction. Herein, we describe a Ni(II) N-confused porphyrin complex () featuring an acidic N-H group. It is readily deprotonated and exists in an anion form during catalysis.

Pulse Electrolysis Turns on CO Methanation through N-Confused Cupric Porphyrin.

Breaking the D symmetry in the square-planar M-N configuration of macrocycle molecular catalysts has witnessed enhanced electrocatalytic activity, but at the expense of electrochemical stability. Herein, we hypothesize that the lability of the active Cu-N motifs in the N-confused copper (II) tetraphenylporphyrin (CuNCP) could be overcome by applying pulsed potential electrolysis (PPE) during electrocatalytic carbon dioxide reduction. We find that applying PPE can indeed enhance the CH selectivity on CuNCP by 3 folds to reach the partial current density of 170 mA cm at >60 % Faradaic efficiency (FE) in flow cell.

A generalized multipath delayed-choice experiment on a large-scale quantum nanophotonic chip.

Bohr's complementarity is one central tenet of quantum physics. The paradoxical wave-particle duality of quantum matters and photons has been tested in Young's double-slit (double-path) interferometers. The object exclusively exhibits wave and particle nature, depending measurement apparatus that can be delayed chosen to rule out too-naive interpretations of quantum complementarity.

Single longitudinal mode GaAs-based quantum dot laser with refractive index perturbation.

We report on the design, fabrication, and characterization of single longitudinal mode InAs/GaAs quantum dot lasers emitting at the 1.3 µm communication band. The influence of simply etched surface high-order gratings in the ridge of the Fabry-Perot lasers has been studied.

Ultra-broadband tunable single- and double-mode InAs/InP quantum dot external-cavity laser emitting around 1.65 μm.

We report an ultra-wide tunable single- and double-mode InAs/InP quantum dot (QD) external-cavity (EC) laser in a Littrow configuration. By combining the high modal gain of the QD material in the long wavelength range and an anti-reflection/high-reflection facet coating, the entire single-mode tuning range was increased up to 190 nm under a relatively low constant pulsed injection current. Furthermore, the tunable range was further increased to 230 nm at different bias currents.

Continuously tunable mode-spacing of a dual-mode external cavity InAs/InP quantum dot laser.

A tunable double-mode external cavity InAs/InP quantum dot laser based on a dual-Littrow configuration is demonstrated. A 115 nm single-mode tuning spectrum with obviously varied mode intensity has been obtained. A modified tuning method has been adopted to realize continuously tunable mode-spacing between two modes.

Hydrogen sulfide improves drought tolerance in Arabidopsis thaliana by microRNA expressions.

Hydrogen sulfide (H2S) is a gasotransmitter and plays an important role in many physiological processes in mammals. Studies of its functions in plants are attracting ever growing interest, for example, its ability to enhance drought resistance in Arabidopsis. A general role of microRNAs (miRNAs) in plant adaptive responses to drought stress has thereby increased our interest to delve into the possible interplay between H2S and miRNAs.

Surface acylation of cellulose whiskers by drying aqueous emulsion.

A simple chemical modification route to confer high hydrophobicity to crystalline cellulose surface was demonstrated using tunicin whiskers as model material. An alkyenyl succinic anhydride (ASA) aqueous emulsion was mixed with cellulose suspension, freeze-dried, and heated to 105 degrees C. The bulk degree of substitution (DS) was evaluated by FT-IR spectrometry, elemental analysis, and weight gain.