Dezhou Zheng

Facile synthesis of large-area manganese oxide nanorod arrays as a high-performance electrochemical supercapacitor

Large-area manganese oxide nanorod arrays (MONRAs) and herringbones (MOHBs) were successfully synthesized on F-doped SnO2 coated glass (FTO) substrates by a simple electrochemical method. Cyclic voltammetry (CV) and galvanostatic charge/discharge measurements demonstrated that the MONRAs and MOHBs exhibited excellent specific capacitance and good cycling stability in 0.5 M Na2SO4 aqueous solution. For example, the specific capacitance of the MONRAs achieves as high as 660.7 F g−1 at a scan rate of 10 mV s−1 and 485.2 F g−1 at a current density of 3 A g−1, respectively. Furthermore, the presented method may be extended to allow similar MONRs with a specific capacitance of 583.6 F g−1 to grow on flexible Ti foil, which may have great potential application in fabricating flexible supercapacitors.

Facile synthesis of free-standing CeO(2) nanorods for photoelectrochemical applications.

Free-standing CeO(2) nanorods with different morphology grew directly on Ti substrates via an electrochemical assembly process, and their absorption edges show a remarkable red-shift to the visible region. Moreover, photoelectrochemical cell (PEC) measurements demonstrate these CeO(2) nanorods exhibit a photovoltaic response under visible light illumination (λ≥ 390 nm).

Facile electrochemical synthesis of single crystalline CeO2 octahedrons and their optical properties.

We developed a simple electrochemical process for the large-scale fabrication of single crystalline CeO(2) octahedrons and nanospheres from DMSO aqueous solution. The octahedrons with some structural defects have a size ranging from 200 to 300 nm. Moreover, highly crystalline CeO(2) nanospheres were also obtained via this electrochemical process based on the oriented attachment mechanism. The absorption edge of octahedrons and spheres shows a red-shift, and that of the octahedrons was near the visible region.

Porous CeO2 nanowires/nanowire arrays: electrochemical synthesis and application in water treatment

Herein, we present a template- and surfactant-free electrochemical method for the fabrication of hierarchical porous CeO2 NWs and NWAs. These porous NWs/NWAs have diameters of 50–200 nm and lengths of up to several micrometres. Both the NWs and NWAs exhibit an excellent ability to remove Congo red in wastewater treatment.

Activated carbon fiber paper with exceptional capacitive performance as a robust electrode for supercapacitors

Herein, a facile and available electrochemical activation approach has been developed to markedly boost the capacitive performance of carbon fiber paper (CFP). The activated CFP could deliver a significant areal capacitance of 1.56 F cm−2 at a high current density of 5 mA cm−2 with excellent rate capability and cycling performance.

General electrochemical assembling to porous nanowires with high adaptability to water treatment

We report a facile, general and scalable approach towards porous La(OH)3/Pr(OH)3/Nd(OH)3 nanowires based on a gas bubble template electrochemical assembly process, and they exhibit a high adaptability for removing Congo red from water.

Facile and Efficient Electrochemical Synthesis of Lanthanum Hydroxide Nanospindles and Nanorods

Herein, we report a template- and surfactant-free electrochemical approach for the preparation of La(OH) 3 nanospindles and nanorods on F-doped SnO 2 substrates. The morphology of the deposits is easily tuned by adjusting the concentration of dimethyl sulfoxide. Moreover, the as-synthesized products show an environmental engineering application due to their remarkable capability in removing organic dye from water.

Controllable growth of La(OH)3 nanorod and nanotube arrays

Large-scale La(OH)3 nanorod/nanotube arrays have grown directly on Cu substrates via a template-free electrodeposition and selective etching process.

A Confinement Strategy for Stabilizing ZIF‐Derived Bifunctional Catalysts as a Benchmark Cathode of Flexible All‐Solid‐State Zinc–Air Batteries

Carbon composites with embedded metal/metal oxides represent a group of versatile electrochemical catalysts that has attracted extensive research attention. However, the beauty of this concept is marred by the severe carbon evaporation and the aggregation of metal species during their synthetic process, leading to the diminishment in active sites and catalytic durability. To address this issue, this study demonstrates the feasibility of utilizing Al2 O3 nanolayer to trap volatile carbon and nitrogen species and alleviate the aggregation of Co species during the pyrolysis of the Zn/Co-ZIFs (ZIF = zeolitic imidazolate framework). With the confinement effect of an Al2 O3 nanolayer, the derived Co3 O4 -embedded N-doped porous carbon grown on carbon cloth presents outstanding bifunctional catalytic activity with a small potential difference of 787 mV between the half-wave potential of the oxygen reduction reaction and an overpotential at 10 mA cm-2 of the oxygen evolution reaction. More impressively, an advanced flexible rechargeable zinc-air battery in all-solid-state configuration is assembled, which achieves the maximum power density of 72.4 mW cm-3 and good cycling stability. The insights produced in this work will provide guidance for the rational design of metal/carbon hybrid catalysts and low-cost renewable energy systems.