ARC Centre of Excellence for Functional Nanomaterials, School of Chemical Engineering, The University of New South Wales, Sydney New South Wales 2052, Australia.
Phys Chem Chem Phys. 2011 Aug 7;13(29):13421-6. doi: 10.1039/c1cp20412b. Epub 2011 Jun 24.
Tungsten oxide (WO(3)) electrodes subjected to a positive bias are self-photorecharged with alkali cations in the electrolyte during visible light illumination. Upon photoexcitation, part of the photogenerated charges generated by WO(3) is stabilized by the cations and stored in situ within the WO(3) framework. This light-induced storage of charges is subsequently utilized in dark conditions in an on-demand manner and is able to be recharged in the successive illumination cycles. The amount of charges stored is shown to be dependent on the cation ionic radii and the presence of these intercalated cations is verified by X-ray diffraction (XRD) and inductively coupled plasma mass spectroscopy (ICP-MS). This self-photorecharge and on-demand charge-release phenomena demonstrate the ability of WO(3) to supply photoexcited charges under dark condition in a photoelectrochemical reaction with greater flexibility.
氧化钨（WO(3)）电极在可见光照射下会受到正偏压的影响，自光电荷在电解质中与碱金属阳离子结合。在光激发下，WO(3)产生的部分光生电荷被阳离子稳定，并在 WO(3)骨架内原位存储。这种光诱导的电荷存储随后可以在黑暗条件下按需使用，并在连续的光照循环中进行再充电。存储的电荷量取决于阳离子的离子半径，通过 X 射线衍射（XRD）和电感耦合等离子体质谱（ICP-MS）验证了这些嵌入阳离子的存在。这种自光电荷和按需电荷释放现象表明，WO(3)在光电化学反应中具有在黑暗条件下提供光激发电荷的能力，具有更大的灵活性。
