Interaction of Ammonia with Nafion and Electrolyte in Electrocatalytic Nitrogen Reduction Study
Interaction of Ammonia with Nafion and Electrolyte in Electrocatalytic Nitrogen Reduction Study
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DOI：
10.1021/acs.jpclett.1c01714
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发表时间：
2021-07-19
影响因子：
5.7
通讯作者：
Zhang, Junliang
中科院分区：
文献类型：
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作者：
Cai, Xiyang;Iriawan, Haldrian;Zhang, Junliang
电化学氮气还原合成氨(NRR)是一种很有前途的替代Haber-Bosch工艺的方法。准确测量生产的氨需要严格的标准，这依赖于对氨特性的更深入了解。在此，我们系统地研究了氨与Nafion膜和电解液的相互作用，以揭示可能导致氨测量偏差的因素。考虑到Nafion膜对氨的低吸附速率和低扩散速率，我们展示了Nafion膜作为分离器的理想特性。但人们应该意识到膜中预先存在的可能污染物。还观察到酸性电解液与碱性电解液相比对氨有更大的亲和力。具体地说，酸性电解液更容易受到进气中潜在的氨污染的影响，而基础电解液在连续的氮气流动下更容易损失产生的氨。这些发现有助于更深入地了解氨在NRR测试中的行为，并有助于获得准确和可靠的氨测量。
Ammonia synthesis by electrochemical nitrogen reduction reaction (NRR) is a promising alternative to the Haber-Bosch process. Accurate measurement of produced ammonia requires rigorous criteria, which rely on a deeper understanding of ammonia characteristics. Herein, we systematically investigated the interaction of ammonia with Nafion membrane and electrolyte to reveal factors that may induce deviation in ammonia measurements. We demonstrated desirable characteristics of Nafion membrane as a separator in view of the low adsorption rate and low diffusion rate for ammonia. But one should be aware of the possible contaminants pre-existing in the membrane. It was also observed that the acid electrolyte had a much greater affinity for ammonia compared with base electrolyte. Specifically, the acid electrolyte is more vulnerable to potential ammonia contaminant in the feeding gas, whereas base electrolyte is inclined to lose produced ammonia under a continuous nitrogen flow. The findings provide a deeper understanding of ammonia's behavior in NRR test and help obtain accurate and credible ammonia measurements.