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[Display omitted] • TZO CNRs with controllable morphology and composition through a traditional metal assisted CVD technique were fabricated. • Three self-powered photodetectors were fabricated using TZO CNRs/Si heterojunction which could detect UV-NIR selectively. • IV-characteristics on illumination of UV and/or NIR radiation show good and fast response. Tellurium dioxide (TeO 2) doped zinc oxide (ZnO) composite nanorods (TZO CNRs) were first synthesized by chemical vapor deposition method on a p-type silicon substrate covered by a sputtered gold (Au) film. The morphologies, structures, compositions and optical properties of the TZO CNRs can be modulated with the TeO 2 content. Three typical self-powered TZO CNRs/Si heterojunction photodetectors named device 1, 2 and 3 according to the different TeO 2 contents and TZO CNR morphologies are designed. Device 1 based on 1.81 At% Te content TZO CNRs can detect UV lights with wavelength from 290 to 380 nm and showed a responsivity of 4.3 mA/W, a detectivity of 1.1 × 1012 cmHz1/2W−1 upon exposure to 370 nm light at a zero-bias voltage. Device 2 based on 5.86 At% Te content TZO CNRs is found to be selectively sensitive to UV and NIR lights. Device 3 based on 9.23 At% Te content TZO CNRs is found to be also selectively sensitive to NIR lights. Its most sensitive wavelength is 1040 nm with responsivity and detectivity of 24.6 mA/W and 4.12 × 1012 cmHz1/2W−1, respectively. In addition, the mechanism that led to their typical properties of these devices are also elucidated. [ABSTRACT FROM AUTHOR]

Three-dimensional hybrid structure with Ni 3 S 2 nanorod arrays as core material and NiCo hydroxide nanosheets as shell material is fabricated directly on flexible Ni foam. This hierarchical hybrid structure without any additives and binders behaves good electrochemical properties including a high specific capacitance of 1833.7 F g −1 (5.13 F cm −2 ) at a current density of 1 A g −1 , good rate capability with 88.27% capacitance retention at a current density of 20 A g −1 and great cyclic stability. Moreover, an asymmetric supercapacitor (ASC) based on NiCo hydroxide@Ni 3 S 2 hybrid structure on Ni foam as positive electrode and activated carbon as negative electrode is successfully assembled to further evaluate the electrochemical properties of the hybrid structure in a full-cell configuration. The ASC device also performs excellent electrochemical properties including a large potential window of 0–1.8 V, a high specific capacitance of 215.8 F g −1 at a current density of 1 A g −1 and long-term cycling performance. In the meantime, the ASC device also delivers a high energy density of 92.8 Wh kg −1 at a power density of 1.0 KW kg −1 . These results suggest that 3D NiCo hydroxide@Ni 3 S 2 hybrid structure has promising potential for use in high-performance supercapacitor. [ABSTRACT FROM AUTHOR]

Fiber supercapacitors have attracted public attentions because of their merits of relatively high capacitance density, flexibility and easy integration with various electronic devices. In this work, a flexible coaxial-type fiber solid-state asymmetrical supercapacitor (ASC) based on Ni 3 S 2 nanorod array electrode and pen ink electrode was successfully fabricated. The Ni 3 S 2 nanorod array electrode was synthesized by directly growing Ni 3 S 2 nanorod arrays on a nickel wire through a facile hydrothermal method and the pen ink electrode as negative electrode was synthesized by a simple dip-coating method. The solid-state ASC device presents a stable voltage window of 1.4 V and behaves a high specific capacitance of 34.9 F g −1 (87.25 F cm −1 ) at a scan rate of 10 mV s −1 . Compared with the symmetric supercapacitor (SSC) based on Ni 3 S 2 electrodes, the ASC device provide an increased energy density of 8.2 Wh kg −1 (0.81 mWh cm −3 ) at the power density of 214.6 W kg −1 (21.12 mW cm −3 ). In addition, the ASC device also exhibits excellent electrochemical stability with 93.1% of initial specific capacitance after 3000 consecutive cycles and good mechanical stability. These encouraging results present its great potential in flexible solid-state energy storage devices. [ABSTRACT FROM AUTHOR]

In this work, three dimensional Co 9 S 8 nanorod@Ni(OH) 2 nanosheet core-shell structure is directly fabricated on flexible carbon cloth by a simple low temperature hydrothermal method. This structure with good electrochemical performance could be applied for supercapacitor electrode material. Firstly, this three dimensional structure possesses high specific capacitance of 1620 F g −1 , which is 1.7 times of the specific capacitance of the pure Ni(OH) 2 electrode and 2.5 times of that of the pure Co 9 S 8 electrode. Secondly, this hybrid electrode exhibits a very high energy density of 70.0 Wh Kg −1 at the power density of 305.7 W kg −1 . In addition, the hybrid electrode displays good cycling stability with 104.5% of the initial capacitance after 2000 continuous cycles. Furthermore, the hybrid electrode with three dimensional structure possesses excellent flexibility and has almost the same cyclic voltammetry curve under different bending angles. Thus, the designed electrode holds great promises for light weight, flexible, high energy density supercapacitor applications. [ABSTRACT FROM AUTHOR]