wileyonlinelibrary.comAs a typical transition-metal dichalcogenide, MoS 2 is a promising electrocatalyst for HER. Both computational and experimental results have confi rmed that the HER activity of MoS 2 stemmed from the sulfur edges, whereas the basal planes were catalytically inert. [ 16,17 ] As a result, nanosized MoS 2 should be more active for HER electrocatalysis than the relatively inert bulk forms due to the presence of more exposed sulfur edges. Besides, the electrical conductivity of catalysts is crucial to the catalytic activity because a high conductivity can ensure a fast electron transfer during a catalytic process. [ 18,19 ] It is well-known that MoS 2 exhibits poor intrinsic conductivity originated from its large bandgap, [ 20 ] which signifi cantly limits the overall HER rate. The past years have witnessed expanding endeavors in improving the conductivity of MoS 2 -based electrocatalysts. Carbon materials have been widely used to improve the catalytic activity of MoS 2 , relying on their unique physicochemical properties. Dai and coworkers synthesized MoS 2 /RGO composite and achieved high HER catalytic activity at a low overpotential. [ 21 ] Chorkendorff and co-workers reported a highly active and stable carbon fi bre/ MoS x composite for electrochemical hydrogen evolution. [ 22 ] Cheng and co-workers synthesized CoS 2 /RGO-CNT composites for high effi cient HER electrocatalysts. [ 23 ] Such fi ndings suggest the signifi cance of carbon materials in HER electrocatalysis. MoS 2 /carbon composites have been successfully applied for the electrocatalytic HER, where carbon materials play the role of hosting MoS 2 as well as enhancing the conductivity of the composites.Although the HER properties of MoS 2 /carbon composites have been investigated, the electrocatalytic activity of MoS 2 supported on carbon materials in the form of a conducting polymer fi lm has not been studied. In this work, we synthesized MoS 2 on the reduced graphene oxide-modifi ed carbon nanotube/ polyimide (PI/CNT-RGO) fi lm by an electrochemical method. CNT can greatly improve the mechanical and electrical properties of CNT/polymer composites, leading to the good conductivity and mechanical properties of PI/CNT fi lm. [ 24,25 ] PI/CNT fi lm can be used over a wide temperature range of −200 to 300 °C and in the condition of strong acid or alkaline. We prepared PI/CNT fi lm and modifi ed the fi lm with RGO which further improved the conductivity of PI/CNT fi lm and affected the morphology of

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In 3+ doped Cu 2Àx Se nanostructures have been successfully synthesized on a flexible carboxyl functionalized multi-walled carbon nanotubes/polyimide (COOH-MWCNTs/PI) membrane substrate by an electrochemical codeposition method. In this work, the focus was on the effect of different In 3+ doping concentrations upon the morphological, structural, optical and photoelectrical properties of Cu 2Àx Se. Two different kinds of nanostructures, nanoflowers and nanolayers, were obtained. The crystallinity of Cu 2Àx Se was improved by doping with In 3+ . The atomic ratio of Cu, Se in Cu 2Àx Se nanolayers is about 1.85 : 1.00, and the atomic % of In is 1.32, confirming the presence of indium. The optical absorption intensity increased with an increase in the doping content of indium ions. However, In 3+ had no effect upon the band gap and absorption edge. The effect of In 3+ dopant on the photoelectric properties was investigated by photocurrent-time and current-voltage (I-V) measurements, which demonstrated that the photoelectric properties of Cu 2Àx Se were improved by doping with In 3+ . This result is significant for the fabrication of optoelectronic nanomaterials and photodetectors based on In 3+ -doped Cu 2Àx Se nanoflowers and nanolayers.

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We report the fabrication of a catechol (CC) sensor based on an In-modified ZnO/carbon nanotubepolyimide (In-ZnO/PI-CNT) film by using a simple electrochemical method. The decoration of In nanoparticles and control of the size and morphology of In nanostructures provide a great opportunity to improve the catalytic activity of ZnO nanosheets. In nanoparticles supported on the ZnO nanosheets exhibit relatively large surface areas and can enhance the electron transfer. An In-ZnO/PI-CNT film is more active for the catalysis of CC than the ZnO/PI-CNT film and the In(3.79%)-ZnO/PI-CNT film shows the best catalytic activity. The In(3.79%)-ZnO/PI-CNT film sensor exhibits a wide linear range, good long-term stability and reproducibility, and performs well for detection of CC in real water samples. The In(3.79%)-ZnO/PI-CNT film holds great potential for the fabrication of efficient sensors.

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