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Nanocone-Modified Surface Facilitates Gas Bubble Detachment for High-Rate Alkaline Water Splitting
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-09-07 , DOI: 10.1002/aenm.202302073 Qiu Ren 1 , Longsheng Feng 2 , Congwang Ye 2 , Xinzhe Xue 1 , Dun Lin 1 , Samuel Eisenberg 1 , Tianyi Kou 3 , Eric B. Duoss 2 , Cheng Zhu 2 , Yat Li 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-09-07 , DOI: 10.1002/aenm.202302073 Qiu Ren 1 , Longsheng Feng 2 , Congwang Ye 2 , Xinzhe Xue 1 , Dun Lin 1 , Samuel Eisenberg 1 , Tianyi Kou 3 , Eric B. Duoss 2 , Cheng Zhu 2 , Yat Li 1
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The significant amount of gas bubbles generated during high-rate alkaline water splitting (AWS) can be detrimental to the process. The accumulation of bubbles will block the active catalytic sites and hinder the ion and electrolyte diffusion, limiting the maximum current density. Furthermore, the detachment of large bubbles can also damage the electrode's surface layer. Here, a general strategy for facilitating bubble detachment is demonstrated by modifying the nickel electrode surface with nickel nanocone nanostructures, which turns the surface into underwater superaerophobic. Simulation and experimental data show that bubbles take a considerably shorter time to detach from the nanocone-modified nickel foil than the unmodified foil. As a result, these bubbles also have a smaller detachment size and less chance for bubble coalescence. The nanocone-modified electrodes, including nickel foil, nickel foam, and 3D-printed nickel lattice, all show substantially reduced overpotentials at 1000 mA cm−2 compared to their pristine counterpart. The electrolyzer assembled with two nanocone-modified nickel lattice electrodes retains >95% of the performance after testing at ≈900 mA cm−2 for 100 h. The surface NC structure is also well preserved. The findings offer an exciting and simple strategy for enhancing the bubble detachment and, thus, the electrode activity for high-rate AWS.
中文翻译：
纳米锥改性表面有利于气泡脱离以实现高速碱性水分解
高速碱性水分解 (AWS) 过程中产生的大量气泡可能对该过程有害。气泡的积累会阻塞活性催化位点并阻碍离子和电解质扩散，限制最大电流密度。此外，大气泡的脱离也会损坏电极的表层。在这里，通过用镍纳米锥纳米结构修饰镍电极表面，将表面变成水下超疏气的，展示了促进气泡脱离的一般策略。模拟和实验数据表明，与未改性的镍箔相比，气泡从纳米锥改性的镍箔上分离所需的时间要短得多。因此，这些气泡的脱离尺寸也较小，气泡合并的机会也较小。纳米锥改性电极，包括镍箔、镍泡沫和 3D 打印镍晶格，与原始电极相比，在 1000 mA cm -2下的过电势均显着降低。由两个纳米锥改性镍晶格电极组装而成的电解槽在约900 mA cm -2下测试100小时后仍保持>95%的性能。表面NC结构也保存完好。这些发现提供了一种令人兴奋且简单的策略来增强气泡脱离，从而增强高速率 AWS 的电极活性。
更新日期：2023-09-07
中文翻译：
纳米锥改性表面有利于气泡脱离以实现高速碱性水分解
高速碱性水分解 (AWS) 过程中产生的大量气泡可能对该过程有害。气泡的积累会阻塞活性催化位点并阻碍离子和电解质扩散，限制最大电流密度。此外，大气泡的脱离也会损坏电极的表层。在这里，通过用镍纳米锥纳米结构修饰镍电极表面，将表面变成水下超疏气的，展示了促进气泡脱离的一般策略。模拟和实验数据表明，与未改性的镍箔相比，气泡从纳米锥改性的镍箔上分离所需的时间要短得多。因此，这些气泡的脱离尺寸也较小，气泡合并的机会也较小。纳米锥改性电极，包括镍箔、镍泡沫和 3D 打印镍晶格，与原始电极相比，在 1000 mA cm -2下的过电势均显着降低。由两个纳米锥改性镍晶格电极组装而成的电解槽在约900 mA cm -2下测试100小时后仍保持>95%的性能。表面NC结构也保存完好。这些发现提供了一种令人兴奋且简单的策略来增强气泡脱离，从而增强高速率 AWS 的电极活性。
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