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Scaling-Free Cathodes: Enabling Electrochemical Extraction of High-Purity Nano-CaCO3 and -Mg(OH)2 in Seawater
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-24 , DOI: 10.1021/acs.est.4c04700 Wenda Kang 1 , Shiyu Meng 1, 2 , Yuchen Zhao 1 , Jiyuan Xu 1 , Shuai Wu 3 , Kun Zhao 4 , Shuo Chen 1 , Junfeng Niu 4 , Hongtao Yu 1 , Xie Quan 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2024-07-24 , DOI: 10.1021/acs.est.4c04700 Wenda Kang 1 , Shiyu Meng 1, 2 , Yuchen Zhao 1 , Jiyuan Xu 1 , Shuai Wu 3 , Kun Zhao 4 , Shuo Chen 1 , Junfeng Niu 4 , Hongtao Yu 1 , Xie Quan 1
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For electrochemical application in seawater or brine, continuous scaling on cathodes will form insulation layers, making it nearly impossible to run an electrochemical reaction continuously. Herein, we report our discovery that a cathode consisting of conical nanobundle arrays with hydrophobic surfaces exhibits a unique scaling-free function. The hydrophobic surfaces will be covered with microbubbles created by electrolytic water splitting, which limits scale crystals from standing only on nanotips of conical nanobundles, and the bursting of large bubbles formed by the accumulation of microbubbles will cause a violent disturbance, removing scale crystals automatically from nanotips. Benefiting from the scaling-free properties of the cathode, high-purity nano-CaCO3 (98.9%) and nano-Mg(OH)2 (99.5%) were extracted from seawater. This novel scaling-free cathode is expected to eliminate the inherent limitations of electrochemical technology and open up a new route to seawater mining.
中文翻译：
无结垢阴极：能够电化学萃取海水中的高纯度纳米 CaCO3 和 -Mg(OH)2
对于海水或盐水中的电化学应用，阴极上的连续结垢将形成绝缘层，使得电化学反应几乎不可能连续进行。在此，我们报告了我们的发现，即由具有疏水表面的圆锥形纳米束阵列组成的阴极表现出独特的无结垢功能。疏水表面会被电解水分解产生的微气泡覆盖，这限制了水垢晶体只能站立在圆锥形纳米束的纳米尖端上，微气泡积累形成的大气泡的破裂会引起剧烈的扰动，自动将水垢晶体从圆锥形纳米束中去除。纳米尖端。受益于阴极的无结垢特性，从海水中提取出高纯度纳米CaCO 3 (98.9%)和纳米Mg(OH) 2 (99.5%)。这种新型的无结垢阴极有望消除电化学技术的固有局限性，开辟海水开采的新途径。
更新日期：2024-07-24
中文翻译：
无结垢阴极：能够电化学萃取海水中的高纯度纳米 CaCO3 和 -Mg(OH)2
对于海水或盐水中的电化学应用，阴极上的连续结垢将形成绝缘层，使得电化学反应几乎不可能连续进行。在此，我们报告了我们的发现，即由具有疏水表面的圆锥形纳米束阵列组成的阴极表现出独特的无结垢功能。疏水表面会被电解水分解产生的微气泡覆盖，这限制了水垢晶体只能站立在圆锥形纳米束的纳米尖端上，微气泡积累形成的大气泡的破裂会引起剧烈的扰动，自动将水垢晶体从圆锥形纳米束中去除。纳米尖端。受益于阴极的无结垢特性，从海水中提取出高纯度纳米CaCO 3 (98.9%)和纳米Mg(OH) 2 (99.5%)。这种新型的无结垢阴极有望消除电化学技术的固有局限性，开辟海水开采的新途径。
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