Rational design and synergistic effect of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves for highly selective electrochemical CO_(2)reduction

The electrocatalytic CO_(2)reduction reaction(CO_(2)RR)is regarded as a promising route for renewable energy conversion and storage,but its development is limited by the high overpotential and low stability and selectivity of electrocatalysts.Moreover,it is complicated to accurately adjust the nanostructure of electrocatalysts,which impacts repeatability.Herein,we propose the rational design and controlled preparation of ultrafine Ag nanodots decorated fish-scale-like Zn nanoleaves(Ag-NDs/Zn-NLs)for highly selective electrocatalytic CO_(2)reduction.The Ag-NDs/Zn-NLs can be in-situ grown on copper foil with simple electrodeposition and replacement reactions.Benefiting from the coordination and synergistic effect of Zn and Ag species,the reconstruction of Zn surface and the agglomeration of Ag-NDs are efficiently prevented,bringing high activity and durable electrocatalytic stability for CO_(2)-to-CO conversion.The Faradaic efficiency for CO production reaches 85.2%at a moderate applied potential of-1.0 V vs.reversible hydrogen electrode(RHE).This study provides a promising approach for controlling the catalytic activity and selectivity of CO_(2)RR through the structural adjustment and decoration of transition metal based nanocatalysts.

Mirror-twin induced bicrystalline InAs nanoleaves

In this study, leaf-like one-dimensional InAs nanostructures were grown by the metal-organic chemical vapor deposition method. Detailed structural charac- terization suggests that the nanoleaves contain relatively low-energy {122} or {133} mirror twins acting as their midribs and narrow sections connecting the nanoleaves and their underlying bases as petioles. Importantly, the mirror twins lead to identical lateral growth of the twinned structures in terms of crystallography and polarity, which is essential for the formation of lateral symmetrical nanoleaves. It has been found that the formation of nanoleaves is driven by catalyst energy minimization. This study provides a biomimic of leaf found in nature by fabricating a semiconductor nanoleaf.

[0001]-Oriented InN Nanoleaves and Nanowires: Synthesis,Growth Mechanism and Optical Properties

Novel indium nitride （INN） leaf-like nanosheets and nanowires have been grown on Si substrate by chemical vapor deposition method. The characterization results indicate that the samples are single-crystalline, and the growth direction of the nanowires and nanoleaves is [0001]. The growth mechanism of the InN nanoleaves is following the pattern of vapor-liquid-solid process with a three-step growth process. In addition, the room temperature photoluminescence spectra of two nanostructures show band-to-band emissions around 0.706 eV, where the emission from single nanoleaf is stronger than nanowire, showing potential for applications in optoelectronic devices.

水热法制备WO3纳米阵列及其在钙钛矿太阳电池中的应用（英文）

以不同浓度的钨源溶液通过水热法制备了W03纳米树叶阵列和W03纳米片阵列，并研究了其形貌、晶相和吸收光谱。基于WO3纳米树叶阵列作为骨架层的钙钛矿太阳电池实现了4．96％的光电转化效率（PCE），且开路电压（Voc）为0．48V，短路电流密度（Jsc）为19．66mA．cm-2，填充因子（fF）为0．52。基于WO3纳米片阵列的太阳电池的PCE，Voc，Jsc和fF分别为0．27％，0．14V，5．96mA·cm-2，0．32。WO3纳米阵列与空穴传输材料的直接接触增加了电子和空穴的复合，不利于电池的开路电压和填充因子。