An integrated solar cell with built-in energy storage capability
An integrated solar cell with built-in energy storage capability
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DOI：
10.1016/j.electacta.2020.136368
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发表时间：
2020-07
影响因子：
6.6
通讯作者：
Husain Almakrami;Zi Wei;Guanzhou Lin;Xinfang Jin;Ertan Agar;Fuqiang Liu
中科院分区：
文献类型：
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作者：
Husain Almakrami;Zi Wei;Guanzhou Lin;Xinfang Jin;Ertan Agar;Fuqiang Liu
由于光固有的间歇性，太阳能必须存储在光伏系统的外部电池中，导致系统脆弱且昂贵。如果外部电池被内部电池取代，内部存储集成可以以极低的成本提供高度健壮的系统。尽管染料敏化太阳能电池具有优异的光电转换效率，但其存储能力不足。在这项工作中，我们展示了一种集成的太阳能存储电池，由于其集成的能量存储能力，即使在黑暗中也有可能提供太阳能。该电池建立在染料敏化太阳能电池平台上，使用光致变色wo3电极，能够在白天同时产生和储存电荷，并在夜间释放储存的电荷。具体来说，研究了三种不同批次的wo3纳米颗粒，每种纳米颗粒都具有独特的粒径，并研究了它们与太阳能存储电池的兼容性和内置存储容量。研究结果表明，wo3粒径最大（~ 100 nm）的太阳能储能电池具有最佳的瞬态电压电流特性。另一方面，中等粒径（60 ~ 95 nm）的wo3在长时间的光充电过程中表现出最好的存储容量。这些比较研究揭示了电极的形态差异，活性表面积，孔隙率相关的电子传递和氧化还原扩散系数对电极的光/电化学性能有重大影响。
Due to inherent intermittency nature of light, solar energy must be stored within external batteries in photovoltaic systems, resulting in systems that are fragile and expensive. Internal storage integration can offer highly robust systems at substantially low cost if external batteries are replaced by internal ones. Despite excellent photovoltaic power conversion efficiencies of dye-sensitized solar cells, they are short of storage capability. In this work, we demonstrate an integrated solar storage cell that can potentially deliver solar power even in darkness owing to its integrated energy storage capability. The cell was built upon the dye-sensitized solar cell platform using a photochromic WO3electrode and had the ability to simultaneously generate and store charges during the day and discharge the stored charges during night. Specifically, three different batches of WO3nanoparticles, each of unique particle size, were investigated in terms of their compatibility with the solar storage cell and built-in storage capacity. Our results revealed that the solar storage cell with the largest WO3particle size (∼100 nm) exhibited the best transient voltage-current characteristics. On the other hand, intermediate WO3particle size (60–95 nm) displayed the best storage capacity when undergoing a prolonged photocharging. These comparative investigations shed light on the morphological difference in electrode, active surface area, porosity-dependent electron transport, and redox diffusion coefficient that have a significant impact on the photo/electrochemical properties of the electrodes.