质子捐赠阳离子使膜电极组件中的高效和稳定的酸性CO2减少成为可能.
Shijia Feng1,2, Ziang Liu2, Dongfang Cheng3
1National Laboratory of Solid State Microstructures, School of Sustainable Energy and Resources, Jiangsu Key Laboratory of Artificial Functional Materials, Collaborative Innovation Center of Advanced Microstructures, Frontiers Science Center for Critical Earth Material Cycling, Nanjing University, Nanjing 210008, China.
氨 (NH4+) 通过增强选择性和降低电压,改善酸性系统中的电化学二氧化碳减排 (CO2R). 这种新的方法为可持续化学品生产提供了稳定高效的途径.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 可持续化学 可持续化学
背景情况:
- 酸性膜电极组件 (MEA) 中的电化学CO2减排 (CO2R) 对可持续化学生产具有前景,但在选择性,电池电压和稳定性方面面临挑战.
- 目前使用酸的方法提高了选择性,但由于水的质子捐赠能力较弱,由于高过电位和降水而受到影响,导致运行问题.
- 解决这些局限性对于将CO2R技术推向实际应用至关重要.
研究的目的:
- 引入和评估氨 (NH4+) 作为酸性MEAs中的双重功能阴离子和质子捐赠体,用于电化学CO2减排.
- 为了证明NH4+如何同时提高选择性,减少过量的潜能,提高运行稳定性.
- 为了克服 CO2R 过程中水等传统质子捐赠者的局限性.
主要方法:
- 在酸性MEA中利用NH4+作为离子和质子捐赠体,并使用CoPc@CNT-NH2催化剂.
- 研究NH4+向催化剂表面的电迁移,以稳定中间体并管理局部质子度.
- 在有限的质子传输条件下,与水相比,分析NH4+的质子捐赠能力.
- 评估NH4+对二碳酸盐分解和沉物管理的影响.
- 在特定条件下运行系统 (100 mA cm-2,60°C) 并在110小时内评估性能.
主要成果:
- NH4+显示了增强的二氧化碳中间稳定性和降低局部质子度,导致高选择性.
- NH4+的优越的质子捐赠能力降低了质子屏障,降低了CO2R过电和电池电压.
- NH4+在较低温度下促进了高效的二碳酸盐分解,促进了沉物的去除,并使NH3/NH4+循环稳定.
- 在100 mA cm-2和60°C时实现了平均86%的CO2-CO选择性.
- 在2.84V的平均电池电压下,经过110多小时的稳定运行,能效达40.6%.
结论:
- 氨 (NH4+) 在酸性MEAs中有效地作为质子捐赠离子,同时提高CO2R选择性,减少过量的电位,提高运行稳定性.
- 这一战略克服了水作为质子捐赠者的关键局限性,为更高效和实用的电化学二氧化碳减排铺平了道路.
- 这些发现代表了基于酸性MEA的CO2R的重大进步,使该技术更接近现实世界的实施.
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