We developed a novel moisture-induced power generator (MPG) by utilizing Berlin green (BG) as an active material to enhance its moisture-electric energy transformation (MEET) performance. The bilayer-based MPG device was fabricated by stacking a BG/graphene oxide/cellulose nanofiber (BGC) composite layer on a NaCl/cellulose nanofiber (NC) composite layer. Moisture adsorption onto the NC layer triggered the dissociation and spontaneous diffusion of the sodium ions toward the BGC layer due to the ion concentration gradient. The adsorption of positive sodium ions onto the BGC layer induced electron transfer from the counter electrode through the external wire, generating electricity. Furthermore, the insertion of sodium ions into the BG framework reduced BG to Prussian blue, generating additional electricity. This synergistic interplay of physical and electrochemical processes resulted in excellent MEET performance: 1.17 V and 2770 μA cm⁻² at 90% relative humidity. These values are two and ten times higher than those of the bilayer MPG without BG, respectively. In particular, the current density of BGC–NC is the highest value that has been reported to date.

中文翻译：

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柏林绿色框架高效湿电能源转换的协同效应

我们利用柏林绿（BG）作为活性材料开发了一种新型湿气感应发电机（MPG），以增强其湿气-电能转换（MEET）性能。基于双层的 MPG 器件是通过将 BG/氧化石墨烯/纤维素纳米纤维 (BGC) 复合层堆叠在 NaCl/纤维素纳米纤维 (NC) 复合层上制成的。由于离子浓度梯度，NC 层上的水分吸附引发了钠离子向 BGC 层的解离和自发扩散。 BGC 层上吸附正钠离子，诱导电子通过外部导线从对电极转移，从而产生电能。此外，将钠离子插入 BG 框架中，将 BG 还原为普鲁士蓝，从而产生额外的电力。这种物理和电化学过程的协同相互作用带来了优异的 MEET 性能：90% 相对湿度下为1.17 V 和 2770 μA cm ^-2 。这些值分别比没有 BG 的双层 MPG 高两倍和十倍。特别是，BGC-NC的电流密度是迄今为止报道的最高值。