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利用丰富的海水资源电解制氢,一直是个极具前景的设想。然而,海水中的盐分往往会带来棘手的难题——直接电解不仅容易引发副反应、腐蚀电极,还会导致膜组件堵塞。

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(图片来源:《Nature Energy》)

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    出版时间: 2026-09-13
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    利用丰富的海水资源电解制氢,一直是个极具前景的设想。然而,海水中的盐分往往会带来棘手的难题——直接电解不仅容易引发副反应、腐蚀电极,还会导致膜组件堵塞。

    . 制氢余热让海水多产一份淡水. 科技导报, 2026 , 44 (17) : 8 -8 .
    . Science & Technology Review, 2026 , 44 (17) : 8 -8 .
    利用丰富的海水资源电解制氢,一直是个极具前景的设想。然而,海水中的盐分往往会带来棘手的难题——直接电解不仅容易引发副反应、腐蚀电极,还会导致膜组件堵塞。
    目前工业界多采用“先淡化、后电解”的折中方案。但这又引发了新的资源浪费:淡化和制氢2套系统相互独立,制氢所需的淡化水需要耗能制备;与此同时,现有的商业化碱性电解水装置在运行中,约有30% 的电能会转化为80~90℃的低品位余热,为了防止设备过热,还得额外消耗电力和冷却水来散热。
    能不能让电解槽产生的废热去承担海水淡化的工作,既供应制氢,又额外产出淡水?
    中国科学院大连化学物理研究所邓德会、刘艳廷团队将这一设想变成了现实。2026年9月15日,相关研究发表于《Nature Energy》。
    研究人员的核心思路,是将碱性水电解与负压低温蒸馏技术结合在一起。通过降低系统内部压力,海水的沸点被大幅拉低,在实验中仅需约44℃即可蒸馏。这意味着,电解槽排出的低品位余热刚好足够用来驱动海水淡化。在这一过程中,水蒸气冷凝变成纯净淡水,盐分则被截留在浓缩海水中。
    为了验证这套工艺的实战能力,团队先建成20 kW中试系统,产氢量达到3.8 Nm3/h,同时联产淡水1.2 kg/h。进一步放大至250 kW后,系统产氢量达到48Nm3/h,氢气纯度达到99.9999%,并在满足制氢自身用水需求的同时联产淡水31.6 kg/h。Nm3表示气体在标准状态下的体积(标准立方米)。
    2个系统分别开展了跨度100 d和40 d的稳定性测试,采用每天启停、稳态负荷运行4 h的方式。与仅采用淡水的传统碱性电解制氢相比,250 kW耦合系统的电能利用率提高14.4%。
    (综合:《Nature Energy》、中国科学院大连化学物理研究所官网)

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    • 首发时间:2026-10-14
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    2种不同金属材料的力学参数
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    鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
    小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
    多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
    红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
    小菇属 Mycena 11 5.26
    光柄菇属 Pluteus 5 2.39
    红菇属 Russula 17 8.13
    栓菌属 Trametes 5 2.39
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