Yu Bo, Liu Jin-Hang, Guo Shuaibiao, Huang Guanlin, Zhang Shengjia, Chen Shuangqiang, Li Xiaopeng, Wang Yong, Lv Li-Ping
Department of Chemical Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China.
Key Laboratory of Organic Compound Pollution Control Engineering (MOE) Shanghai University, Shanghai, 200444, China.
Mater Horiz. 2023 Oct 2;10(10):4589-4596. doi: 10.1039/d3mh00587a.
The exploitation of highly active bifunctional electrocatalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) in acidic media has been a subject receiving immense interest. However, the existing catalysts usually suffer from low catalytic efficiency and poor corrosion resistance under acidic conditions. Herein, we report a facile molten salt method to fabricate ruthenium dioxide nanoparticles supported by hierarchically porous carbon (RuO/PC) as a bifunctional electrocatalyst for full water splitting under strong acidic conditions. The formation of a densely populated nanocrystalline RuO/carbon heterostructure helps expose catalytic sites, accelerates the mass transfer rate, and further enhances the acid resistance of RuO nanoparticles. The as-synthesized RuO/PC consequently exhibits superior catalytic performance for the OER with an overpotential of 181 mV upon 10 mA cm compared to that of the commercial RuO (343 mV) and a comparable performance to Pt/C for the HER (47.5 mV upon 10 mA cm) in 0.5 M HSO. The RuO/PC shows promising stability with little degradation over ∼24 h. Impressively, the water electrolyzer based on RuO/PC shows an overpotential of 326 mV at 10 mA cm, much lower than that of the electrolyzer based on the combination of Pt/C and RuO (400 mV), indicating its great potential towards practical application.
开发用于酸性介质中析氧反应（OER）和析氢反应（HER）的高活性双功能电催化剂一直是备受关注的课题。然而，现有催化剂在酸性条件下通常催化效率低且耐腐蚀性差。在此，我们报道一种简便的熔盐法制备由分级多孔碳负载的二氧化钌纳米颗粒（RuO₂/PC），作为在强酸性条件下用于全水分裂的双功能电催化剂。形成密集排列的纳米晶RuO₂/碳异质结构有助于暴露催化位点，加速传质速率，并进一步提高RuO₂纳米颗粒的耐酸性。因此，所合成的RuO₂/PC在10 mA cm⁻²时对OER表现出优异的催化性能，过电位为181 mV，相比商业RuO₂（343 mV）有显著提升，并且在0.5 M H₂SO₄中对HER的性能与Pt/C相当（10 mA cm⁻²时为47.5 mV）。RuO₂/PC在约24小时内显示出良好的稳定性，降解很少。令人印象深刻的是，基于RuO₂/PC的水电解槽在10 mA cm⁻²时过电位为326 mV，远低于基于Pt/C和RuO₂组合的电解槽（400 mV），表明其在实际应用中具有巨大潜力。
