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Silver Compositing Boosts Water Electrolysis Activity and Durability of RuO2 in a Proton-Exchange-Membrane Water Electrolyzer
Small Science ( IF 11.1 ) Pub Date : 2023-07-18 , DOI: 10.1002/smsc.202300055 Jiayi Tang 1 , Yijun Zhong 1 , Chao Su 2 , Zongping Shao 1
Small Science ( IF 11.1 ) Pub Date : 2023-07-18 , DOI: 10.1002/smsc.202300055 Jiayi Tang 1 , Yijun Zhong 1 , Chao Su 2 , Zongping Shao 1
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Proton-exchange-membrane water electrolyzers (PEMWEs) are of particular interest for green hydrogen production, where the oxygen evolution reaction (OER) at the anode largely determines the overall efficiency. Up to now, only ultrafine IrO2 catalyst gives desirable performance, while its scarcity and high cost inhibit the widespread application. RuO2 catalyst is the most promising alternative, while its practical application is greatly hindered by poor durability. Herein, the greatly boosted performance of conventional sub-micrometer RuO2 by compositing with Ag is reported, and both the morphology of Ag and the compositing way significantly affect the electrolysis performance. The PEMWE fabricated with a two-layer RuO2/Ag nanowire (NWs) composite anode achieves 1.77 A cm−2 at 2.00 V, due to a prominent 44.6 times increase of the electronic conductivity, which greatly improves the catalyst utilization. In addition, mass transportation at high-current-density region is enhanced due to the highly porous feature of Ag NW layer. Long-term stability under high current density of 1 A cm−2 for 100 h is proved with the composite anode, due to the suppressed degradation of RuO2 by silver compositing. This work may accelerate the widespread commercialization of PEMWEs by providing a new way for developing IrO2-free anode.
中文翻译：
银复合提高质子交换膜水电解槽中 RuO2 的水电解活性和耐久性
质子交换膜水电解槽 (PEMWE) 对于绿色氢气生产特别感兴趣，其中阳极的析氧反应 (OER) 在很大程度上决定了整体效率。迄今为止，只有超细IrO 2催化剂具有良好的性能，但其稀缺性和高成本限制了其广泛应用。RuO 2催化剂是最有前途的替代品，但其耐久性差极大地阻碍了其实际应用。在此，报道了传统亚微米RuO 2通过与Ag复合而大大提高了性能，并且Ag的形态和复合方式都显着影响电解性能。采用两层 RuO 2制备的 PEMWE/Ag纳米线（NWs）复合阳极在2.00 V时达到1.77 A cm -2，由于电子电导率显着提高了44.6倍，这大大提高了催化剂利用率。此外，由于Ag NW层的高度多孔特性，高电流密度区域的质量传输得到增强。由于银复合抑制了RuO 2的降解，证明了复合阳极在1 A cm -2的高电流密度下100小时的长期稳定性。这项工作可能通过提供开发无IrO 2阳极的新途径来加速PEMWE的广泛商业化。
更新日期：2023-07-18
中文翻译：
银复合提高质子交换膜水电解槽中 RuO2 的水电解活性和耐久性
质子交换膜水电解槽 (PEMWE) 对于绿色氢气生产特别感兴趣，其中阳极的析氧反应 (OER) 在很大程度上决定了整体效率。迄今为止，只有超细IrO 2催化剂具有良好的性能，但其稀缺性和高成本限制了其广泛应用。RuO 2催化剂是最有前途的替代品，但其耐久性差极大地阻碍了其实际应用。在此，报道了传统亚微米RuO 2通过与Ag复合而大大提高了性能，并且Ag的形态和复合方式都显着影响电解性能。采用两层 RuO 2制备的 PEMWE/Ag纳米线（NWs）复合阳极在2.00 V时达到1.77 A cm -2，由于电子电导率显着提高了44.6倍，这大大提高了催化剂利用率。此外，由于Ag NW层的高度多孔特性，高电流密度区域的质量传输得到增强。由于银复合抑制了RuO 2的降解，证明了复合阳极在1 A cm -2的高电流密度下100小时的长期稳定性。这项工作可能通过提供开发无IrO 2阳极的新途径来加速PEMWE的广泛商业化。
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