电解
海水
电解质
高压电解
材料科学
聚合物电解质膜电解
电解水
氢
离解(化学)
化学工程
无机化学
化学
电极
物理化学
有机化学
工程类
地质学
海洋学
作者
Hao Shi,Tanyuan Wang,Jianyun Liu,Weiwei Chen,Shenzhou Li,Jiashun Liang,Shuxia Liu,Xuan Li,Zhao Cai,Chao Wang,Dong Su,Yangyang Huang,Lior Elbaz,Qing Li
标识
DOI:10.1038/s41467-023-39681-1
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).
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