一个离子导向的不对称电解器,用于降低直接海水电解的操作电压
Hao Shi1, Tanyuan Wang2, Jianyun Liu1
1State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, 430074, Wuhan, Hubei, China.
Nature communications
|July 4, 2023
概括
这项研究引入了一种新的pH-非对称电解仪,用于高效的直接海水电解,克服腐蚀和降水等挑战,以生产负担得起的绿色.
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
- 可再生能源可再生能源是可再生能源.
背景情况:
- 直接的海水电解以生产气受到高能耗,化物腐蚀和沉形成的阻碍.
- 现有的方法很难从海水中高效,低成本地产生气.
研究的目的:
- 开发一种使用离子 (Na+) 交换膜进行直接海水电解的pH不对称电解器.
- 为了减轻 (Cl-) 腐蚀和 (Ca2+) / (Mg2+) 沉,同时降低能源消耗.
- 通过先进的催化剂设计来增强的进化动力学.
主要方法:
- 设计和制造具有Na+交换膜的pH不对称电解仪.
- 现场拉曼光谱分析催化剂性能.
- 密度函数理论 (DFT) 计算以了解反应机制.
- 电化学测试用于评估性能指标,如电流密度和电压.
主要成果:
- 电解器成功地防止了Cl-腐蚀和Ca2+/Mg2+沉.
- 在Ni-Fe-P纳米线上使用具有原子分散 (Pt) 的催化剂,可将水解离能障碍降低0.26 eV.
- 实现了高电流密度 (100 mA cm-2 在1.46 V,400 mA cm-2 在1.66 V 在80°C).
- 展示了每公斤H2的1.36美元的竞争性电力成本,达到美国能源部2025年目标.
结论:
- 与pH不对称的电解器设计为高效和成本效益的直接海水电解提供了一个有前途的解决方案.
- 开发的催化剂显著提高了进化动力学,减少了能源需求.
- 这项技术为利用丰富的海水资源进行可扩展的绿色气生产铺平了道路.
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