Showing papers by "Jianming Lin published in 2015"

Bifacial dye-sensitized solar cells: A strategy to enhance overall efficiency based on transparent polyaniline electrode

Abstract: Bifacial dye-sensitized solar cells: A strategy to enhance overall efficiency based on transparent polyaniline electrode

TiO2 quantum dots as superb compact block layers for high-performance CH3NH3PbI3 perovskite solar cells with an efficiency of 16.97%

Abstract: A compact TiO2 layer is crucial to achieve high-efficiency perovskite solar cells. In this study, we developed a facile, low-cost and efficient method to fabricate a pinhole-free and ultrathin blocking layer based on highly crystallized TiO2 quantum dots (QDs) with an average diameter of 3.6 nm. The surface morphology of the blocking layer and the photoelectric performance of the perovskite solar cells were investigated by spin-coating with three different materials: colloidal TiO2 QDs, titanium precursor solution, and aqueous TiCl4. Among these three treatments, the perovskite solar cell based on the TiO2 QD compact layer offered the highest power conversion efficiency (PCE) of 16.97% with a photocurrent density of 22.48 mA cm−2, a photovoltage of 1.063 V and a fill factor of 0.71. The enhancement of PCE mainly stems from the small series resistance and the large shunt resistance of the TiO2 QD layer.

Facile synthesis of Ni0.85Se on Ni foam for high-performance asymmetric capacitors

Abstract: Ni0.85Se was in situ grown on Ni foam via a facile hydrothermal process as a high-performance electrode for supercapacitors. The as-obtained Ni0.85Se electrode exhibited excellent electrochemical properties with a higher specific capacitance of 1115 F g−1 (1.34 F cm−2) and remarkable cycling stability (91.7% of the initial capacitance value remained after 1000 cycles). An asymmetric supercapacitor was fabricated successfully based on Ni0.85Se (positive electrode) and activated carbon (negative electrode). The Ni0.85Se//AC ASC can expand the operating voltage as high as 1.6 V, which led to an ultrahigh energy density of 32.2 Wh kg−1 at a power density of 789.6 W kg−1. Further, the ASC had a highlight cycle performance (only 1.7% of CT loss after 2000 cycles), so it holds promise as a potential candidate for energy storage devices.

Cobalt selenide/tin selenide hybrid used as a high efficient counter electrode for dye-sensitized solar cells

Abstract: Cobalt selenide/tin selenide (CoSe/SnSe) hybrid is successfully synthesized via a facile solvothermal method and used as an efficient Pt-free counter electrode (CE) for dye-sensitized solar cells (DSSCs). Field emission scanning electron microscopy observes that CoSe/SnSe hybrid is made up of nanosheets and nanoparticles; the nanosheets are CoSe, while the nanoparticles are SnSe. Cyclic voltammogram measurement indicates that CoSe/SnSe hybrid electrodes have larger current density than CoSe electrode and Pt electrode. Electrochemical impedance spectroscopy shows that the 3CoSe/SnSe hybrid has low charge-transfer resistance of 1.03 Ω cm2. Under simulated solar light irradiation with intensity of 100 mW cm−2 (AM 1.5), the DSSC based on the Co3SnSe4 hybrid CE achieves a power conversion efficiency of 7.71 %, which is higher than that the DSSC based on conventional Pt CE (6.89 %). The DSSCs with all as-prepared CoSe/SnSe hybrid CEs exhibit better photovoltaic performance than the DSSC with conventional Pt CE.

Preparation of PAA‐g‐PEG/PANI polymer gel electrolyte and its application in quasi solid state dye‐sensitized solar cells

Abstract: A microporous hybrid polymer of poly(acrylic acid)-g-poly(ethylene glycol)/polyaniline (PAA-g-PEG/PANI) is synthesized by a two-step solution polymerization method. The influence of aniline concentration on the conductivity of PAA-g-PEG/PANI gel electrolyte is discussed, when the concentration of aniline is 0.66 wt%, the conductivity of PAA-g-PEG/PANI gel electrolyte is 11.50 mS cm−1. Using this gel electrolyte as host, a quasi solid state dye-sensitized solar cell (QS-DSSC) is assembled. The QS-DSSC based on this gel electrolyte achieves a power conversion efficiency of 6.38% under a simulated solar illumination of 100 mW cm−2 (AM 1.5). POLYM. ENG. SCI., 55:322–326, 2015. © 2014 Society of Plastics Engineers

High‐performing dye‐sensitized solar cells based on reduced graphene oxide/PEDOT‐PSS counter electrodes with sulfuric acid post‐treatment

Abstract: Four kinds of counter electrodes are prepared with polystyrene-sulfonate doped poly(3,4-ethylenedioxythiophene) (PEDOT-PSS) as basic material, reduced graphene oxide (rGO) sheets as additives and H2SO4 as treating agent. The cyclic voltammetry and Tafel polarization are measured to evaluate catalytic activity of these counter electrodes for /I− redox couple. It is found that H2SO4 treated rGO and PEDOT-PSS hybrid counter electrode (S/rGO/PEDOT-PSS counter electrode) has the highest catalytic activity among these counter electrodes. Power conversion efficiency of the dye-sensitized solar cell with S/rGO/PEDOT-PSS counter electrode can attain to 7.065%, distinctly higher than that of the cells with the other three ones, owing to the great enhanced fill factor and short-circuit current density. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42648.

Cadmium selenide quantum dots solar cells featuring nickel sulfide/polyaniline as efficient counter electrode provide 4.15% efficiency

Abstract: Nickel sulfide decorated polyaniline (NiS/PANI) co-deposition onto fluorine-doped tin oxide (FTO) substrate using an in situ electropolymerization route and served as the counter electrode (CE) for polysulfide electrolyte in cadmium selenide (CdSe) quantum dots sensitized solar cells (QDSSCs). The NiS/PANI CE provided great electrocatalytic activity and lower charge-transfer resistance compared to the platinum (Pt), NiS and PANI CEs under the same preparation conditions prepared using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization plots characterization. It was because the photoanode was modified with a TiO2 dense layer and thioglycolic acid that the QDSSC exhibited an improved fill factor and short-circuit current density. Under optimum conditions, the QDSSC featuring a NiS/PANI counter electrode provided an enhanced power conversion efficiency of 4.15% under an illumination of 100 mW cm−2.

Preparation of nano-flower-like SnO2 particles and their applications in efficient CdS quantum dots sensitized solar cells

Abstract: Two kinds of hierarchical SnO2 particles as nano-flower-like SnO2 particles (NF-SnO2) and mesoporous-sphere-like SnO2 particles (MS-SnO2) have been synthesized and used in CdS quantum dots (QDs) sensitized solar cells (QDSSC). TEM images show that NF-SnO2 particles compose well interconnected nanoplates and MS-SnO2 spheres are consisted with large numbers of SnO2 nanoparticles with size about 7 nm. Owing to the larger Brunauer–Emmett–Teller surface area of NF-SnO2 particles, NF-SnO2 photoelectrode can load higher amounts of CdS QDs and shows enhanced light absorbance, resulting in higher short-circuit current density compared with that of MS-SnO2 photoelectrode. The electrochemical impedance spectroscopy analysis results show that the QDSSC with NF-SnO2 photoelectrode has a higher charge recombination resistance and a longer electron lifetime, so its photovoltaic performance is better than that of the QDSSC with MS-SnO2 photoelectrode. The QDSSC with NF-SnO2 photoelectrode can attain 3 % power conversion efficiency, which is higher than that of the cell with MS-SnO2 photoelectrode (1.97 %).