在高电流密度下增强尿素氧化反应的新型配Ni4N@CuCoN0.6异构的工程
Guangfu Qian1, Haotian Xu2, Liancen Li2
1Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control, School of Light Industry and Food Engineering, Guangxi University, Nanning 530004, China; Laboratory of Alternative Energy Conversion Systems, Department of Mechanical Engineering, School of Engineering, University of Thessaly, 1 Sekeri Street, Pedion Areos 38834, Greece.
一种新型的-化/化异构催化剂在铜泡上,在高电流密度下表现出尿素氧化反应 (UOR) 的异常性能,显示出尿素电解的增强活性和稳定性.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 为尿素氧化反应 (UOR) 开发高效的电催化剂对于推进尿素电解技术至关重要.
- 高电流密度运行对现有的基UOR催化剂构成重大挑战.
研究的目的:
- 合成和表征一种在铜泡 (V-doped-Ni4N@CuCoN0.6/CF) 上支的化Ni4N@CuCoN0.6异构结构作为高性能UOR电催化剂.
- 研究异质连接结构和兴奋剂对UOR活性和高电流密度稳定性的协同效应.
主要方法:
- 在铜泡上合成刷状V-doped-Ni4N@CuCoN0.6异构结构.
- 电化学表征包括循环电压测量,时测量和操作电化学阻抗光谱学.
- 在1.0 M KOH + 0.5 M尿素溶液中对催化性能的评估.
主要成果:
- V-doped-Ni4N@CuCoN0.6/CF催化剂表现出极好的UOR活性,在电流密度分别为10,500和1000mA cm-2时,其超电位为1.26V,1.40V和1.45V.
- 异质连接的形成促进了电荷再分配,增强了活性部位和尿素吸附.
- 兴奋剂优化了电子结构,改善了尿素吸附/二氧化碳脱附,并降低了反应能量障碍.
- 操作研究证实了直接的尿素氧化和高效的电子转移.
- 催化剂表现出了显著的稳定性,在80小时内保持了500 mA cm−2,这是由于其类似刷子的结构有助于释放泡和质量运输.
结论:
- 这种V-doped-Ni4N@CuCoN0.6/CF催化剂在高电流密度下是UOR的高效电催化剂.
- 异质连接,兴奋剂和独特形态的协同集成为设计先进的UOR电催化剂提供了一个有前途的策略.
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