利用具有离子选择性的纳米通道实现浓度梯度差发电

Power Generation from Concentration Gradient Using Ion-selective Nanochannels

利用纳米多孔阳极氧化铝膜的纳米孔阵列,实现了浓度梯度差发电.通过纳米孔阵列两侧浓度梯度差的改变,分析了输出功率与浓度梯度差的关系,并报道了短路电流和开路电压随时间的演化规律.基于纳米孔与输运离子的静电相互作用原理,我们发现平均孔径约25 nm的纳米多孔阳极氧化铝膜对离子输运具有选择透过性.进一步,通过引入纳米颗粒对纳米多孔阳极氧化铝膜进行修饰,输出功率提高了近18倍,而且纳米孔阵列的离子选择性发生变化.我们初步认为这可能与纳米颗粒与纳米孔阵列的复合结构的离子选择性相关.

Power generation from concentration gradient was achieved by using nanopores array of nanoporous anodic alumina membrane.The relationship between output power and the concentration gradient was analyzed by changing the difference of the concentration on the two sides of the nanopores array.Moreover,the evolution of the short-circuit current and the open-circuit voltage over time was reported.Based on the principle of electrostatic interaction between nanopores and ions,we found that the nanoporous anodic alumina membrane with the average pore diameter of about 25 nm possess the perm-selectivity of ion transport.Further,the output power was increased by nearly 18 times by introducing nanometer particles to modify the nanoporous anodic alumina membrane.It was noted that the ion permselectivity of nanopores array was changed after introducing nanoparticles.We initially considered that it may be related to the ion selectivity of the composite structure of nanoparticles and nanopores array.