催化学报 ›› 2023, Vol. 44: 50-66.DOI: 10.1016/S1872-2067(22)64148-2

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氮还原反应中氨定量假阳性结果的来源与消除方法

李雅a,1, 王震康c,1, 季浩卿c,1, 张莉芳b, 钱涛b,c, 晏成林c,d,*(), 路建美a,*()   

  1. a苏州大学材料与化学化工学部, 苏州纳米科技协同创新中心, 江苏苏州 215123
    b南通大学化学与化工学院, 江苏南通 226019
    c苏州大学能源学院, 高比能量电池和石油与化学工业关键材料核心技术国家重点实验室, 江苏苏州 215006
    d电化学电源轻工业研究所, 江苏苏州 215600
  • 收稿日期:2022-05-23 接受日期:2022-07-04 出版日期:2023-01-18 发布日期:2022-12-08
  • 通讯作者: 晏成林,路建美
  • 作者简介:1共同第一作者.
  • 基金资助:
    国家自然科学基金(52071226);国家自然科学基金(51872193);国家自然科学基金(U21A20332);江苏省自然科学基金(BK20181168);江苏省自然科学基金(BK20201171);江苏省科技厅重点研发项目(BE2020003-3);江苏省高等学校自然科学基金项目(19KJA210004);江苏省高等学校重点学科发展计划(PAPD)

Excluding false positives: A perspective toward credible ammonia quantification in nitrogen reduction reaction

Ya Lia,1, Zhenkang Wangc,1, Haoqing Jic,1, Lifang Zhangb, Tao Qianb,c, Chenglin Yanc,d,*(), Jianmei Lua,*()   

  1. aCollaborative Innovation Center of Suzhou Nano Science and Technology, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, Jiangsu, China
    bCollege of Chemistry and Chemical Engineering, Nantong University, Nantong 226019, Jiangsu, China
    cKey Laboratory of Core Technology of High Specific Energy Battery and Key Materials for Petroleum and Chemical Industry, College of Energy, Soochow University, Suzhou 215006, Jiangsu, China
    dLight Industry Institute of Electrochemical Power Sources, Suzhou 215600, Jiangsu, China
  • Received:2022-05-23 Accepted:2022-07-04 Online:2023-01-18 Published:2022-12-08
  • Contact: Chenglin Yan, Jianmei Lu
  • About author:Chenglin Yan (College of Energy at Soochow University) is a Professor and Dean of the College of Energy at Soochow University in Suzhou, China. He received his Ph.D. from Dalian University of Technology in 2008. In 2011, he became a staff scientist and a group leader at the Institute for Integrative Nanoscience at the Leibniz Institute in Dresden (Germany). His primary research interests focus on electrochemical energy storage.
    Jianmei Lu (College of Chemistry, Chemical Engineering and Materials Science at Soochow University) is a Professor of the College of Chemistry, Chemical Engineering and Materials Science and Vice Chancellor of Soochow University. She received her PhD in polymer chemistry from Zhejiang University in 1999 and was appointed as professor of Soochow University in 2000. Her current research interests involve organic and polymer electronic memory functional materials synthesis, device design and mechanism research, adsorption performance and mechanism of adsorbent materials, treatment of industrial waste water and waste gas containing volatile organic compounds and synthesis of photocatalytic functional materials.
    1 Contributed equally to this work.
  • Supported by:
    National Natural Science Foundations of China(52071226);National Natural Science Foundations of China(51872193);National Natural Science Foundations of China(U21A20332);Natural Science Foundations of Jiangsu Province(BK20181168);Natural Science Foundations of Jiangsu Province(BK20201171);Key R&D Project funded by Department of Science and Technology of Jiangsu Province(BE2020003-3);Natural Science Foundation of the Jiangsu Higher Education Institutions of China(19KJA210004);Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

摘要:

氨(NH3)广泛应用于化肥等工业化学品的生产中, 年消耗量巨大. 同时, 氨具有高氢含量和高能量密度, 可作为清洁能源载体和燃料, 具有广阔的应用前景. 因此, 合成氨工业在国民经济和社会发展中起着重要作用. 目前, 合成氨的主要采用传统的Haber-Bosch工艺, 但其严苛的操作条件导致了大量能源消耗和二氧化碳排放, 进一步加剧了全球变暖. 在全球能源危机和环境问题的背景下, 开发可再生能源驱动的绿色高效氨合成技术受到广泛关注. 其中, 以光催化和电催化为动力的氮还原反应(NRR)被认为是最有前途的方法之一.

然而, 由于N2吸附动力学缓慢, N≡N键分裂困难且析氢反应严重, 目前电催化和光催化氮还原的产率和法拉第效率都较低. 近年来, 得益于各种催化剂和电解液的发展, NRR产率和法拉第效率不断提升, 但也逐渐暴露出一些严重的问题——测试结果呈现高波动性和低重复性, 甚至假阳性, 这使得人们对NRR的发展前景产生了怀疑. 由于NRR反应的产量极低(通常为纳/微摩尔水平), 所以反应过程中的微量污染都可能严重影响NH3的定量结果, 从而导致对NRR反应体系性能的误判. 因此, 如何保证得到的产物NH3完全来自于氮气的还原是一个难题.

本文基于NRR反应整个检测流程中的污染源和不确定性, 包括来自反应物和实验装置中的杂质, 各种定量方法的固有缺陷, 甚至一些细微的定量仪器误差等, 将影响氨定量的潜在因素细分为催化剂污染、实验过程中引入的污染以及量化方法的固有缺陷等, 详细讨论了这些潜在因素如何干扰氨的最终定量结果, 并总结了已报道的相应消除干扰策略. 此外, 结合本课题组在NRR领域的研究经验, 提出了一套严格的NRR检测办法, 该办法针对NRR检测的三个阶段: 检测前、检测中和定量过程, 提出了相应建议. 最后, 对该领域的未来发展进行了展望, 提出一些关键问题和发展方向, 希望能为促进NRR研究发展提供一些借鉴.

关键词: 氮还原反应, 氨定量, 假阳性, 污染, 同位素

Abstract:

As an essential raw material for fertilizer production and promising green fuels, ammonia is significant to the national economy and social development. Recently, nitrogen reduction reaction (NRR) towards ammonia under mild conditions has received intensive attention due to environmental friendliness and low energy consumption, compared to the rigorous and contaminative Haber-Bosch process. However, as current research deepens, some fatal challenges emerged in this field‒not only high volatility and low repeatability but false‒positive results, casting serious doubts about its prospects. In this review, we summarized and discussed some potential factors that possibly induce false-positive results for accurate ammonia quantification, including the aspects of catalyst materials, experimental process, and quantification methods. And corresponding methods to eliminate these effects are also summarized. Furthermore, a promising protocol and several control principles are proposed to eliminate potential errors during ammonia quantification. This review establishes a paradigm base in NRR research field toward more accurate ammonia quantification.

Key words: Nitrogen reduction reaction, Ammonia quantification, False positives, Contamination, Isotope