Highly Efficient Osmotic Energy Harvesting in Charged Boron‐Nitride‐Nanopore Membranes
Highly Efficient Osmotic Energy Harvesting in Charged Boron‐Nitride‐Nanopore Membranes
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DOI：
10.1002/adfm.202009586
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发表时间：
2021-02
影响因子：
19
通讯作者：
A. Pendse;Semih Cetindag;P. Řehák;S. Behura;Haiqi Gao;Ngoc Hoang Lan Nguyen;Tongshuai Wang;V. Berry
中科院分区：
文献类型：
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作者：
A. Pendse;Semih Cetindag;P. Řehák;S. Behura;Haiqi Gao;Ngoc Hoang Lan Nguyen;Tongshuai Wang;V. Berry
最近对纳米流体平台的高能量转换效率的研究揭示了有效利用纳米孔膜中的电动现象从盐度梯度中获取清洁能源的巨大潜力。本文提出了一种由垂直排列的氮化硼纳米孔(VA-BNNP)膜组成的纳米流体反向电渗析(NF-RED)，它可以有效地利用渗透能量。VA-BNNP的功率密度高达105W m−2，比其他孔径相近的纳米孔高出几个数量级，净功率密度为165 mW m−2(即每膜面积的功率)。采用低压化学气相沉积技术，在一维阳极氧化氧化铝孔内均匀沉积了一层薄的BN膜，制备了具有高纳米孔密度的宏观VA-BNNP膜，≈_(108)孔/−_2。这些膜可以解决高电荷态纳米孔中的离子迁移率、液体传输和发电等基本问题。结果表明，在整个盐浓度范围内，VA-BNNP中的迁移数几乎是恒定的，这与其他纳米孔系统不同。此外，研究还表明，在高盐度梯度下，沉积在纳米孔道上的BN能显著提高扩散渗透速度两个数量级，从而导致功率密度的显著增加。
Recent studies of the high energy‐conversion efficiency of the nanofluidic platform have revealed the enormous potential for efficient exploitation of electrokinetic phenomena in nanoporous membranes for clean‐energy harvesting from salinity gradients. Here, nanofluidic reverse electrodialysis (NF‐RED) consisting of vertically aligned boron‐nitride‐nanopore (VA‐BNNP) membranes is presented, which can efficiently harness osmotic power. The power density of the VA‐BNNP reaches up to 105 W m−2, which is several orders of magnitude higher than in other nanopores with similar pore sizes, leading to 165 mW m−2 of net power density (i.e., power per membrane area). Low‐pressure chemical vapor deposition technology is employed to uniformly deposit a thin BN layer within 1D anodized alumina pores to prepare a macroscopic VA‐BNNP membrane with a high nanopore density, ≈108 pores cm−2. These membranes can resolve fundamental questions regarding the ion mobility, liquid transport, and power generation in highly charged nanopores. It is shown that the transference number in the VA‐BNNP is almost constant over the entire salt concentration range, which is different from other nanopore systems. Moreover, it is also demonstrated that the BN deposition on the nanopore channels can significantly enhance the diffusio‐osmosis velocity by two orders of magnitude at a high salinity gradient, resulting in a huge increase in power density.