Boosting solar hydrogen production via electrostatic interaction mediated E.coli-TiO_(2−x)biohybrid system

Hydrogen is garnering growing attention as a green energy source with zero carbon emissions.However,most hydrogen production technologies still rely on the consumption of fossil fuels and are therefore unsustainable.This has driven the search for more environmentally friendly methods of hydrogen production.In this work,we present an innovative approach to enhance hydrogen generation via electrostatic interaction in the Escherichia coli and defective titanium dioxide(TiO_(2−x))biohybrids.Our method involves narrowing the forbidden bandwidth of TiO2 while introducing defect bands into its conduction band to facilitate visible light absorption and efficient charge separation.This biohybrid system,consisting of E.coli and TiO_(2−x),demonstrates a remarkable capability to produce 1.25 mmol of hydrogen within a 3-h timeframe under visible light irradiation.This accomplishment signifies a 3.31-fold rise in hydrogen production in comparison to E.coli,signifying a substantial enhancement in hydrogen production efficiency.Furthermore,we delve into the alterations in biological metabolites associated with hydrogen production and the changes in electron transfer in different biohybrid systems.It provides valuable insights into the understanding of the intrinsic mechanisms that drive the process.This work introduces a novel and promising avenue for achieving this exciting goal.

High piezoelectricity performance in PSBZT ceramic for ultrasonic transducer

Lead zirconate titanate(PZT)ceramics possess great potential for practical applications and thus improving their piezoelectric properties is crucial.Pb0.99−xSm0.01BaxZr0.53Ti0.47O3(PSBZT)ceramics with high Curie temperature and excellent piezoelectric properties were fabricated via a conventional solid-state method,and the effect of Ba2+doping on the structural,dielectric,piezoelectric and ferroelectric properties was studied in detail.It is shown that doping of Ba2+significantly enhanced the piezoelectric properties of PSZT,the maximum d33~533 pC/N and Tc~361°C at x=0.02 were acquired.Furthermore,PSZT and PSBZT ceramics were used to prepare single element ultrasonic transducers,and their performance were compared and evaluated.The results demonstrate that the PSBZT ceramic-based transducer possesses better sensitivity and bandwidth than the PSZT ceramic-based transducer.

Reactive Transport Modeling of Long-Term CO2 Sequestration Mechanisms at the Shenhua CCS Demonstration Project,China

Carbon dioxide injection into deep saline aquifers results in a variety of strongly coupled physical and chemical processes. In this study, reactive transport simulations using a 2-D radial model were performed to investigate the fate of the injected CO2, the effect of CO2-water-rock interactions on mineral alteration, and the long-term CO2 sequestration mechanisms of the Liujiagou Formation sandstone at the Shenhua CCS（carbon capture and storage） pilot site of China. Carbon dioxide was injected at a constant rate of 0.1 Mt/year for 30 years, and the fluid flow and geochemical transport simulation was run for a period of 10 000 years by the TOUGHREACT code according to the underground conditions of the Liujiagou Formation. The results show that different trapping phases of CO2 vary with time. Sensitivity analyses indicate that plagioclase composition and chlorite presence are the most significant determinants of stable carbonate minerals and CO2 mineral trapping capacity. For arkosic arenite in the Liujiagou Formation, CO2 can be immobilized by precipitation of ankerite, magnesite, siderite, dawsonite, and calcite for different mineral compositions, with Ca（2＋）, Mg（2＋）, Fe（2＋） and Na＋ provided by dissolution of calcite, albite（or oligoclase） and chlorite. This study can provide useful insights into the geochemistry of CO2 storage in other arkosic arenite（feldspar rich sandstone） formations at other pilots or target sites.

Control of polymorphism in solution-processed organic thin film transistors by self-assembled monolayers

Polymorphism of organic semiconductor films is of key importance for the performance of organic thin film transistors(OTFTs).Herein,we demonstrate that the polymorphism of solution-processed organic semiconductors in thin film transistors can be controlled by finely tuning the surface nanostructures of substrates with self-assembled monolayers(SAMs).It is found that the SAMs of 12-cyclohexyldodecylphosphonic acid(CDPA)and 12-phenyldodecylphosphonic acid(Ph DPA)induce different polymorphs in the dip-coated films of 2-dodecyl[1]benzothieno[3,2-b][1]benzothiophene(BTBT-C12).The film of BTBT-C12 on CDPA exhibits field effect mobility as high as 28.1 cm2 V-1 s-1 for holes,which is higher than that of BTBT-C12 on Ph DPA by three times.The high mobility of BTBT-C12 on CDPA is attributable to the highly oriented films of BTBT-C12 with a reduced in-plane lattice and high molecular alignment.