Molybdenum disulfide (MoS2) has attracted extensive attention as a non-noble metal electrocatalyst for hydrogen evolution reaction (HER). Controlling the skeleton structure at the nanoscale is paramount to increase the number of active sites at the surface. However, hydrothermal synthesis favors the presence of the basal plane, limiting the efficiency of catalytic reaction. In this work, perfect hollow MoS2 microspheres capped by hollow MoS2 nanospheres (hH-MoS2) were obtained for the first time, which creates an opportunity for improving the HER electrocatalytic performance. Benefiting from the controllable hollow skeleton structure and large exposed edge sites, high-efficiency HER activity was obtained for stacked MoS2 thin shells with a mild degree of disorder, proving the presence of rich active sites and the validity of the combined structure. In general, the obtained hollow micro/nano MoS2 nanomaterial exhibits optimized electrocatalytic activity for HER with onset overpotential as low as 112 mV, low Tafel slope of 74 mV decade(-1), high current density of 10 mA cm(-2) at η = 214 mV, and high TOF of 0.11 H2 s(-1) per active site at η = 200 mV.
Core/shell nano-structuring of metal oxide semiconductors and their photocatalytic studies AIP Conf. Proc. 1512, 34 (2013); 10.1063/1.4790898Surface effects on the optical and photocatalytic properties of graphene-like ZnO:Eu3+ nanosheetsThe molybdenum disulfide (MoS 2 )@ZnO nano-heterojunctions were successfully fabricated through a facile three-step synthetic process: prefabrication of the ZnO nanoparticles, the synthesis of MoS 2 nanoflowers, and the fabrication of MoS 2 @ZnO heterojunctions, in which ZnO nanoparticles were uniformly self-assembled on the MoS 2 nanoflowers by utilizing polyethyleneimine as a binding agent. The photocatalytic activities of the composite samples were evaluated by monitoring the photodegradation of methylene blue (MB). Compared with pure MoS 2 nanoflowers, the composites show higher adsorption capability in dark and better photocatalytic efficiency due to the increased specific surface area and improved electron-hole pair separation. After irradiation for 100 min, the remaining MB in solution is about 7.3%. Moreover, the MoS 2 @ZnO heterojunctions possess enhanced field emission properties with lower turn-on field of 3.08 V lm À1 and lower threshold field of 6.9 V lm À1 relative to pure MoS 2 with turn-on field of 3.65 V lm À1 and threshold field of 9.03 V lm À1 . V C 2014 AIP Publishing LLC. [http://dx.
The combinations of hollow MoS 2 micro@nano-spheres were successfully fabricated through a one-step hydrothermal method. A possible growth mechanism was presented in detail based on time-dependent experimental facts. Besides, the photocatalytic activities of the samples were evaluated by monitoring the photodegradation of methylene blue (MB). The adsorption value of 150 mg g À1 shows a strong adsorption capability in the dark. After irradiation for only 30 min, the remaining MB in solution is about 9.7%. Moreover, the humidity sensing properties of the samples were measured for the first time. The results revealed high sensitivity at high RH, small humidity hysteresis, fast response and recovery times, and good stability. The greatest sensitivity is 32.19 nF/% RH and the maximum hysteresis is $6.3% RH.For humidity cycling of 17.2-89.5-17.2% RH, the response and recovery times are $140 s and $80 s, respectively. Capacitance fluctuations for one month are less than AE7% at various relative humidities (RHs).
A novel hierarchical MoS2@SnO2 hetero-nanoflower was successfully synthesized by a facile, two-step hydrothermal method without using any additives or surfactants. One possible growth mechanism of the hetero-nanostructure was presented in detail based on OH(-) ion-dependent experimental facts. Due to the formation of the p-n junctions and the increased specific surface area in the composites, an outstanding photocatalytic activity of the as-prepared sample was obtained by monitoring the photodegradation of methylene blue (MB). According to the data, after irradiation for 100 min, the remaining MB in solution is about 26% for MoS2 nanoflowers and 9.5% for MoS2@SnO2 hetero-nanoflowers. Moreover, an excellent field-emission performance was obtained from MoS2@SnO2 hetero-nanoflower relative to the pure MoS2 with the turn-on field decreasing from 4.2 V μm(-1) to 3.4 V μm(-1) and the threshold field decreasing from 6.2 V μm(-1) to 5.2 V μm(-1), which is mainly attributed to the increased field-emission points and MoS2-SnO2 heterojunction.
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