ORCID Profile
0000-0002-4714-9019
Current Organisation
Wuhan University of Technology
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Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9CC02845E
Abstract: Dynamic morphological, structural and compositional changes will occur when transition metal phosphides and chalcogenides are used to catalyze the oxygen evolution reaction, which can substantially enhance their electrocatalytic performance.
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 03-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA14210H
Abstract: Fast and selective laser sintering is efficient for the treatment of TiO 2 nanoparticle film for flexible DSC applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR02169F
Abstract: Herein, an organic redox couple 1-methy-1H-tetrazole-5-thiolate (T(-)) and its disulfide dimer (T2) redox shuttle, as an electrolyte, is introduced in a p-type dye-sensitized solar cell (DSC) on the basis of an organic dye (P1) sensitizer and nanocrystal CuCrO2 electrode. Using this iodide-free transparent redox electrolyte in conjunction with the sensitized heterojunction, we achieve a high open-circuit voltage of over 300 mV. An optimal efficiency of 0.23% is obtained using a CoS counter electrode and an optimized electrolyte composition under AM 1.5 G 100 mW cm(-2) light illumination which, to the best of our knowledge, represents the highest efficiency that has so far been reported for p-type DSCs using organic redox couples.
Publisher: Wiley
Date: 21-06-2013
Abstract: Herein, we present ultrasmall delafossite-type Mg-doped CuCrO2 nanocrystals prepared by using hydrothermal synthesis and their first application as photocathodes in efficient p-type dye-sensitized solar cells. The short-circuit current density (Jsc ) is notably increased by approximately 27% owing to the decreased crystallite size and the enhanced optical transmittance associated with Mg doping of the CuCrO2 nanocrystalline s le. An open-circuit voltage (Voc ) of 201 mV, Jsc of 1.51 mA cm(-2) , fill factor of 0.449, and overall photoconversion efficiency of 0.132% have been achieved with the CuCr0.9 Mg 0.1 O2 dye photocathode sensitized with the P1 dye under optimized conditions. This efficiency is nearly three times higher than that of the NiO-based reference device, which is attributed to the largely improved Voc and Jsc . The augmentation of Voc and Jsc can be attributed to the lower valance band position and the faster hole diffusion coefficient of CuCr0.9 Mg 0.1 O2 compared to those of the NiO reference, respectively, which leads to a higher hole collection efficiency.
Publisher: American Chemical Society (ACS)
Date: 30-06-2014
DOI: 10.1021/JP409363U
Publisher: IOP Publishing
Date: 03-08-2016
DOI: 10.1088/0957-4484/27/37/375401
Abstract: Hematite (i.e., α-Fe2O3) nanorod photoanodes passivated with a phosphorus overlayer have been fabricated by decomposing sodium hypophosphite (NaH2PO2) at a low temperature over the hematite nanorod surface. Extensive scanning electron microscopy, transmission electron microscopy, x-ray diffractometry and UV-vis spectroscopy characterizations confirm that conformal deposition of an amorphous phosphorus overlayer does not change the crystal structure, morphology, and optical absorption properties of hematite photoanodes. X-ray photoelectron spectroscopy reveals that phosphorus in the deposited overlayer exists in an oxidized state. Comprehensive steady-state polarization, transient photocurrent response, and impedance spectroscopy measurements as well as Mott-Schottky analysis manifest that the phosphorus overlayer is able to effectively passivate surface states and suppress electron-hole recombination, substantially enhancing the photocurrent for water oxidation. Combining the phosphorization treatment with two-step thermal activation, a photocurrent density of 1.1 mA cm(-2) is achieved at 1.23 V versus reversible hydrogen electrode under illumination of 100 mW cm(-2), ca 55 times higher than that of the non-activated pristine hematite photoanode measured under the same conditions. The simple and fast phosphorization strategy we present here can be readily applied to passivate surfaces of other semiconductor photoelectrodes to improve their photoelectrochemical performance.
Publisher: Royal Society of Chemistry (RSC)
Date: 2014
DOI: 10.1039/C3TA14072E
Abstract: This work demonstrates CuGaO 2 as an efficient alternative to NiO as a photocathode material in dye-sensitized solar cells. A remarkable photocurrent has been achieved by the CuGaO 2 photocathode.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7SC05033J
Abstract: A notable trend in OER activity on transition metal phosphide pre-catalysts is reported. Remarkably, the tri-metallic FeCoNiP pre-catalysts exhibit exceptional apparent and intrinsic OER activities, outperforming many non-precious OER catalysts reported previously.
Publisher: Wiley
Date: 07-02-2017
Abstract: Vertically aligned Ni(OH)
Publisher: American Chemical Society (ACS)
Date: 26-02-2014
DOI: 10.1021/AM405610B
Publisher: Elsevier BV
Date: 06-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C3NR01564E
Abstract: In this paper, low-cost counter electrodes (CEs) based on water-soluble multiwall carbon nanotube (MWCNT) and Cu2ZnSnSe4 nanoparticle (CZTSe NP) composites have been successfully introduced into a quantum dot-sensitized solar cell (QDSC) system. Suitable surface modification allows the MWCNTs and CZTSe NPs to be homogeneously dispersed in water, facilitating the subsequent low-temperature spray deposition of high quality composite films with different composite ratios. The electrochemical catalytic activity of the composite CEs has been critically compared by electrochemical impedance spectroscopy and Tafel-polarization analysis. It is found that the composite CE at the MWCNT : CZTSe ratio of 0.1 offers the best performance, leading to an optimal solar cell efficiency of 4.60%, which is 50.8% higher than that of the Pt reference CE. The as-demonstrated higher catalytic activity of the composite CEs compared to their single components could be ascribed to the combination of the fast electron transport of the MWCNTs and the high catalytic activity of CZTSe NPs.
Publisher: Wiley
Date: 10-05-2017
Abstract: Cobalt selenide has been proposed to be an effective low‐cost electrocatalyst toward the oxygen evolution reaction (OER) due to its well‐suited electronic configuration. However, pure cobalt selenide has by far still exhibited catalytic activity far below what is expected. Herein, this paper for the first time reports the synthesis of new monoclinic Co 3 Se 4 thin nanowires on cobalt foam (CF) via a facile one‐pot hydrothermal process using selenourea. When used to catalyze the OER in basic solution, the conditioned monolithic self‐supported Co 3 Se 4 /CF electrode shows an exceptionally high catalytic current of 397 mA cm −2 at a low overpotential (η) of 320 mV, a small Tafel slope of 44 mV dec −1 , a turnover frequency of 6.44 × 10 −2 s −1 at η = 320 mV, and excellent electrocatalytic stability at various current densities. Furthermore, an electrolyzer is assembled using two symmetrical Co 3 Se 4 /CF electrodes as anode and cathode, which can deliver 10 and 20 mA cm −2 at low cell voltages of 1.59 and 1.63 V, respectively. More significantly, the electrolyzer can operate at 10 mA cm −2 over 3500 h and at 100 mA cm −2 for at least 2000 h without noticeable degradation, showing extraordinary operational stability.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6CC04151E
Abstract: Iron phosphide (FeP) nanorods supported on carbon fiber paper electrodes exhibit outstanding electrocatalytic activity and long-term stability toward the oxygen evolution reaction.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7SE00591A
Abstract: The influence of structural parameters of highly-ordered silicon nanowire arrays on their solar-driven HER performance is systematically investigated.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Wiley
Date: 13-04-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR00140A
Abstract: Ultrafine molybdenum sulfide (MoS
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2JM35101C
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5TA10317G
Abstract: Self-supported porous Ni–P foam is fabricated by a convenient one-step method, and exhibits excellent electrocatalytic performance towards oxygen evolution reaction. An alkaline electrolyzer constructed using two self-supported porous Ni–P foams shows superior energy efficiency of 90.2% at 10 mA cm −2 , and can sustain 1000 h under operation conditions without obvious degradation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7EE03603E
Abstract: Synergistic coupling of ruthenium with cobalt phosphide can significantly boost the hydrogen evolution performance of the hybrid catalysts in a wide pH range.
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C6SC05167G
Abstract: Ultralong single-crystalline CoP nanowires were grown on porous Co foam via a vapor–solid reaction method and used for overall electrochemical water splitting in alkaline solution.
Publisher: Wiley
Date: 07-06-2017
Abstract: A very easy and cost-effective approach to the fabrication of monolithic Co
Publisher: Elsevier BV
Date: 06-2016
Publisher: American Chemical Society (ACS)
Date: 04-04-2014
DOI: 10.1021/IC500090G
Abstract: In this work, we present one-step low temperature hydrothermal synthesis of submicrometer particulate CuAlO2 and AgAlO2 delafossite oxides, which are two important p-type transparent conducting oxides. The synthesis parameters that affect the crystal formation processes and the product morphologies, including the selection of starting materials and their molar ratios, the pH value of precursors, the hydrothermal temperature, pressure, and reaction time, have been studied. CuAlO2 crystals have been synthesized from the starting materials of CuCl and NaAlO2 at 320-400 °C, and from Cu2O and Al2O3 at 340-400 °C, respectively. AgAlO2 crystals have been successfully synthesized at the low temperature of 190 °C, using AgNO3 and Al(NO3)3 as the starting materials and NaOH as the mineralizer. The detailed elemental compositions, thermal stability, optical properties, and synthesis mechanisms of CuAlO2 and AgAlO2 also have been studied. Noteworthy is the fact that both CuAlO2 and AgAlO2 can be stabilized up to 800 °C, and their optical transparency can reach 60%-85% in the visible range. Besides, it is believed the crystal formation mechanisms uncovered in the synthesis of CuAlO2 and AgAlO2 will prove insightful guildlines for the preparation of other delafossite oxides.
Publisher: Springer Science and Business Media LLC
Date: 04-02-2014
DOI: 10.1038/SREP03961
Abstract: Over the past few decades, the field of p-type dye-sensitized solar cell (p-DSSC) devices has undergone tremendous advances, in which Cu-based delafossite nanocrystal is of prime interest. This paper presents an augment of about 87% improvement in photocurrent observed in a particular configuration of organic dye P1 sensitized CuCrO 2 delafossite nanocrystal electrode coupled with organic redox shuttle, 1-methy-1H- tetrazole-5-thiolate and its disulfide dimer when Au nanoparticles (NPs, with diameter of about 20 nm) is added into the photocathode, achieving a power convert efficiency of 0.31% (measured under standard AM 1.5 G test conditions). Detailed investigation shows that the local electrical-magnetic field effect, induced by Au NPs among the mesoporous CuCrO 2 film, can improve the charge injection efficiency at dye/semiconductor interface, which is responsible for the bulk of the gain in photocurrent.
No related grants have been discovered for Dehua Xiong.