A sodium-ion-conducted asymmetric electrolyzer to lower the operation voltage for direct seawater electrolysis
发布时间：2024-12-29
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- 论文类型：
- Research Article
- 第一作者：
- Shi,Hao
- 通讯作者：
- Wang,Tanyuan,Li,Qing
- 合写作者：
- Elbaz,Lior,Huang,Yunhui,Su,Dong,Wang,Chao,Cai,Zhao,Xuan,Shuxia,Liang,Jiashun,Li,Shenzhou,Chen,Weiwei,Liu,]Jianyun
- 发表刊物：
- Nature Communications
- 所属单位：
- 华中科技大学
- 刊物所在地：
- 英国
- 文献类型：
- Article
- 卷号：
- 14
- 期号：
- 1
- 页面范围：
- 3934
- ISSN号：
- 2041-1723
- 关键字：
- Hydrogen Evolution; Water; Energy; Catalyst; Oxygen
- DOI码：
- 10.1038/s41467-023-39681-1
- 发表时间：
- 2023-07-06
- 影响因子：
- 14.7
- 摘要：
- Hydrogen produced from neutral seawater electrolysis faces many challenges including high energy consumption, the corrosion/side reactions caused by Cl-, and the blockage of active sites by Ca2+/Mg2+ precipitates. Herein, we design a pH-asymmetric electrolyzer with a Na+ exchange membrane for direct seawater electrolysis, which can simultaneously prevent Cl- corrosion and Ca2+/Mg2+ precipitation and harvest the chemical potentials between the different electrolytes to reduce the required voltage. In-situ Raman spectroscopy and density functional theory calculations reveal that water dissociation can be promoted with a catalyst based on atomically dispersed Pt anchored to Ni-Fe-P nanowires with a reduced energy barrier (by 0.26 eV), thus accelerating the hydrogen evolution kinetics in seawater. Consequently, the asymmetric electrolyzer exhibits current densities of 10 mA cm−2 and 100 mA cm−2 at voltages of 1.31 V and 1.46 V, respectively. It can also reach 400 mA cm−2 at a low voltage of 1.66 V at 80 °C, corresponding to the electricity cost of US$1.36 per kg of H2 ($0.031/kW h for the electricity bill), lower than the United States Department of Energy 2025 target (US$1.4 per kg of H2).