3 research outputs found
Construction of bicontinuously porous Ni architecture as a deposition scaffold for high performance electrochemical supercapacitors
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A three-dimensional (3D) conductive network as the current collector is </div>
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critical to enabling high-performance power sources because it not only provides a </div>
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highly electrolytic accessible area of electroactive materials, but also facilitates </div>
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electron and electrolyte ion transport. Here, we design a facile method to construct </div>
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a secondary porous Ni structure (SPNi) on the surface of Ni foam. The SPNi-Ni </div>
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scaffold can increase the loading of active materials and facilitate transportation </div>
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of electrons and electrolyte ions. As a demonstration, after depositing Co(OH)(2) </div>
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active material, it can deliver much higher area-specific capacitance of 11.91 F/cm</div>
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(2) at a current density of 10 mA cm(-2) and cyclic stability (similar to 16% loss </div>
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after 1000 cycles) than those on the bare Ni foam under the identical current </div>
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density (3.57 F cm(-2), 30% loss after 1000 cycles). The results establish that the </div>
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bicontinuously 3D porous scaffold is a promising candidate for building up high </div>
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performance energy storage devices.</div
A three-dimensional hexagonal fluorine-doped tin oxide nanocone array: a superior light harvesting electrode for high performance photoelectrochemical water splitting
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Photonic nanostructures hold great promise in promoting light harvesting. Here </div>
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we report the first design and construction of a three-dimensional (3D) hexagonal </div>
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nanocone array of fluorine-doped tin oxide (FTO) on glass as an excellent electrode </div>
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for photoelectrochemical (PEC) water splitting. The PEC current density with </div>
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suitably deposited Ti-doped hematite at 1.23 V vs. the reversible hydrogen electrode </div>
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(RHE) was increased by 86% to 2.24 +/- 0.02 mA cm(-2) compared to that with the </div>
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planar counterpart, mainly ascribable to the special light harvesting effect and the </div>
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electrode surface area provided by 3D FTO. Upon the embedment of a gold layer to </div>
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concentrate the incident light onto the hematite layer and the deposition of the </div>
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Co-Pi catalyst with a modified procedure, the photocurrent experienced a large </div>
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cathodic shift of onset potential by 360 mV and soared to a high value of 3.39 +/- </div>
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0.01 mA cm(-2) (at 1.23 V), yielding a power conversion efficiency of 0.70% at a </div>
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potential as low as 0.88 V vs. RHE. </div
