Simultaneous photocatalytic H2 production
and preparation
of high-value chemicals by the selective oxidation of organic substances
is of great significance for solar energy utilization and conversion.
Herein, a Pt-modified 2D/2D CdS/Fe2O3 Z-scheme
heterojunction was dexterously designed for photocatalytic dehydrogenation
coupling of benzylamine with high performance and product selectivity.
The Z-scheme charge transfer in CdS/Fe2O3 greatly
boosts charge separation and maintains the strong redox capacity of
photogenerated electrons and holes. Impressively, the loading of the
Pt cocatalyst not only provides rich H2 production active
sites to further accelerate charge separation and H2 production
kinetics but also facilitates the condensation of N-benzylideneamine
with benzylamine for N-benzylidenebenzylamine production and NH3 releasing. The selectivity for CN coupling products
is significantly enhanced and the C–C coupling side reaction
is greatly suppressed. With sufficient benzylamine substrate and visible
light irradiation, the optimal Pt/CdS/Fe2O3 composite
displays a high H2 production rate of 39.4 mmol h–1 g–1 with a quantum efficiency of 32.81% at 420
nm, and the selectivity of benzylamine oxidation to N-benzylidenebenzylamine
is above 90%.
Graphite is the major anode material of commercial lithium‐ion batteries (LIBs), and thus improving its cycling stability is an effective approach to extend battery life. In this study, succinic anhydride group, methoxyethanol, and methoxypolyethylene glycol segments are chemically bonded to the surfaces of graphite particles by the Diels‐Alder and the subsequent esterification reactions. The synthesized functionalized graphites are excellent in water dispersibility. The electrochemical results indicate that the functionalization slightly reduces the initial coulombic efficiencies of the graphite anodes, but significantly changes the cycling stability and high C‐rate performance of the corresponding lithium‐ion cells. In particular, the cell based on the graphite functionalized by long‐chain polyethylene glycol exhibits an improvement of 24.1 % in cycle life compared with the pristine graphite. Further analysis shows that these trace organic groups change the properties of the solid‐electrolyte interface (SEI) layer depositing on the graphite surfaces, and therefore influence the performance of the cells.
It is very difficult to make a liquid crystal display (LCD) that is flexible. However, for an optically re-writable LCD (ORWLCD), only the spacers and the substrates need to be flexible because the driving unit and the display unit are separate and there are no electronics in the display part of ORWLCD. In this paper, three flexible-spacer methods are proposed to achieve this goal. A cholesteric liquid crystal colored mirror with a polarizer behind it is used as the colored reflective backboard of an ORWLCD. Polyethersulfone substrates and flexible spacers are used to make the optically re-writable cell insensitive to mechanical force.
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