A membrane-free flow electrolyzer operating at high current density using earth-abundant catalysts for water splitting.
A membrane-free flow electrolyzer operating at high current density using earth-abundant catalysts for water splitting.
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DOI：
10.1038/s41467-021-24284-5
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发表时间：
2021-07-06
影响因子：
16.6
通讯作者：
Yan N
中科院分区：
文献类型：
--
作者：
Yan X;Biemolt J;Zhao K;Zhao Y;Cao X;Yang Y;Wu X;Rothenberg G;Yan N
电化学水裂解是最可持续的制氢方法之一。由于与结构和材料相关的固有约束，常规碱性水电解槽和新兴质子交换膜电解槽分别遭受低效率和高材料/操作成本。在此，我们设计了一种无膜流动电解槽，具有类似于螺旋桨的结构和循环操作模式，用于解耦的整体水分解。该电池由两个物理分隔的隔室组成，其中含有流动的富H2阴极电解液和富O2阳极电解液，可提供纯度> 99.1%的H2。它的低内部欧姆电阻、高活性但价格实惠的双功能催化剂和高效的质量传输使水在2.1 V偏压下以750 mA cm−2的电流密度裂解。电解器在去离子水和普通自来水中同样有效。这项工作展示了通过电池结构和材料设计结合不同电解槽概念的优势进行水分解的机会，为可持续制氢开辟了途径。海水电解对于不依赖淡水的电网规模氢气生产来说是有希望的，但高能源成本和有害的氯化学物质降低了其实际潜力。在这里，作者开发了一种节能的混合海水电解槽，用于无氯制氢和N2 H4降解。
Electrochemical water splitting is one of the most sustainable approaches for generating hydrogen. Because of the inherent constraints associated with the architecture and materials, the conventional alkaline water electrolyzer and the emerging proton exchange membrane electrolyzer are suffering from low efficiency and high materials/operation costs, respectively. Herein, we design a membrane-free flow electrolyzer, featuring a sandwich-like architecture and a cyclic operation mode, for decoupled overall water splitting. Comprised of two physically-separated compartments with flowing H2-rich catholyte and O2-rich anolyte, the cell delivers H2 with a purity >99.1%. Its low internal ohmic resistance, highly active yet affordable bifunctional catalysts and efficient mass transport enable the water splitting at current density of 750 mA cm−2 biased at 2.1 V. The eletrolyzer works equally well both in deionized water and in regular tap water. This work demonstrates the opportunity of combining the advantages of different electrolyzer concepts for water splitting via cell architecture and materials design, opening pathways for sustainable hydrogen generation. Seawater electrolysis is promising for grid-scale H2 production without freshwater reliance, but high energy costs and detrimental Cl chemistry reduce its practical potential. Here, authors developed an energy-saving hybrid seawater electrolyzer for chlorine-free H2 production and N2H4 degradation.
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影响因子：
7.2
作者：
Clarke, R. E.;Giddey, S.;Badwal, S. P. S.
通讯作者：
Badwal, S. P. S.
影响因子：
8.6
作者：
Hua, Bin;Sun, Yi-Fei;Luo, Jing-Li
通讯作者：
Luo, Jing-Li
影响因子：
5.4
作者：
Liu, Chang;Carmo, Marcelo;Lehnert, Werner
通讯作者：
Lehnert, Werner
影响因子：
56.7
作者：
Dotan, Hen;Landman, Avigail;Grader, Gideon S.
通讯作者：
Grader, Gideon S.
金属有机骨架基CoP/还原氧化石墨烯：用于整体水分解的高性能双功能电催化剂
影响因子：
8.4
作者：
Jiao L;Zhou YX;Jiang HL
通讯作者：
Jiang HL