No abstract

TMAP-TEMPO represents an extremely stable redox-active radical organic for an AORFB posolyte. An all-organic AORFB based on TMAP-TEMPO and BTMAP-Vi exhibits an OCV of 1.1 V and a long lifetime, featuring a concentrationindependent temporal capacity retention rate of >99.974% per h, or a capacity retention rate of 99.993% per cycle over 1,000 consecutive cycles.

Due to the promising applications in low-cost and high performance photovoltaic and thermoelectric devices, there has been a booming development of syntheses of colloidal I-III-VI 2 and I 2 -II-IV-VI 4 (I ¼

All-inorganic cesium lead-halide perovskite nanocrystals have emerged as attractive optoelectronic nanomaterials owing to their stabilities and highly efficient photoluminescence. Herein we report a new type of highly luminescent perovskite-related CsPb2 Br5 nanoplatelets synthesized by a facile precipitation reaction. The layered crystal structure of CsPb2 Br5 promoted an anisotropic two-dimensional (2D) crystal growth during the precipitation process, thus enabling the large-scale synthesis of CsPb2 Br5 nanoplatelets. Fast anion exchange has also been demonstrated in as-synthesized CsPb2 Br5 nanoplatelets to extend their photoluminescence spectra to the entire visible spectral region. The large-scale synthesis and optical tunability of CsPb2 Br5 nanoplatelets will be advantageous in future applications of optoelectronic devices.

Recently, porous hydrophobic/oleophilic materials (PHOMs) have been shown to be the most promising candidates for cleaning up oil spills; however, due to their limited absorption capacity, a large quantity of PHOMs would be consumed in oil spill remediation, causing serious economic problems. In addition, the complicated and time-consuming process of oil recovery from these sorbents is also an obstacle to their practical application. To solve the above problems, we apply external pumping on PHOMs to realize the continuous collection of oil spills in situ from the water surface with high speed and efficiency. Based on this novel design, oil/water separation and oil collection can be simultaneously achieved in the remediation of oil spills, and the oil sorption capacity is no longer limited to the volume and weight of the sorption material. This novel external pumping technique may bring PHOMs a step closer to practical application in oil spill remediation.

No abstract

Development of highly active and durable oxygen-evolving catalysts in acid media is a major challenge to design proton exchange membrane water electrolysis for producing hydrogen. Here, we report a quadruple perovskite oxide CaCu 3 Ru 4 O 12 as a superior catalyst for acidic water oxidation. This complex oxide exhibits an ultrasmall overpotential of 171 mV at 10 mA cm −2 geo , which is much lower than that of the state-of-the-art RuO 2 . Moreover, compared to RuO 2 , CaCu 3 Ru 4 O 12 shows a significant increase in mass activity by more than two orders of magnitude and much better stability. Density functional theory calculations reveal that the quadruple perovskite catalyst has a lower Ru 4d-band center relative to RuO 2 , which effectively optimizes the binding energy of oxygen intermediates and thereby enhances the catalytic activity.

Membranes whichallow fast and selective transport of protons and cations are required for aw ide range of electrochemical energy conversion and storage devices,such as proton-exchange membrane (PEM) fuel cells (PEMFCs) and redox flowbatteries (RFBs). Herein we report anew approach to designing solution-processable ion-selective polymer membranes with both intrinsic microporosity and ion-conductive functionality.P olymers are synthesized with rigid and contorted backbones,w hich incorporate hydrophobic fluorinated and hydrophilic sulfonic acid functional groups,t op roduce membranes with negatively charged subnanometer-sized confined ionic channels.T he ready transport of protons and cations through these membranes,a nd the high selectivity towards nanometer-sized redox-active molecules,e nable efficient and stable operation of an aqueous alkaline quinone redox flowb attery and ahydrogen PEM fuel cell.