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Active and stable graphene supporting trimetallic alloy-based electrocatalyst for hydrogen evolution by seawater splitting
Electrochemistry Communications ( IF 5.4 ) Pub Date : 2020-01-23 , DOI: 10.1016/j.elecom.2019.106647
Maria Sarno , Eleonora Ponticorvo , Davide Scarpa

The hydrogen evolution reaction (HER), adopting seawater as an electrolyte solution, is a promising and more sustainable alternative for the production of hydrogen, yet requiring more economic, highly efficient and stable electrocatalysts than the current ones. Herein, the synthesis of a Ni, Ru, Ir-based and graphene-supported nano-structured catalyst through an easily scalable, cost-effective, surfactant-free approach has been proposed. XRD, SEM, TEM images and EDX maps showed the formation of trimetallic NiRuIr alloy nanoparticles (average diameter: 8 nm) supported on a few-layer graphene. After characterization, the HER stability and activity of the sample were tested in a 0.5 M H2SO4, in a KCl neutral solution as well as in real seawater. In the acidic electrolyte environment a 0.06 V overpotential was maintained even after 11000 cycles and the Tafel slope recorded was very low (28 mV/dec). In the neutral solution a very low overpotential (0.10 V) and a low Tafel slope (72 mV/dec) were also obtained. Furthermore, in real seawater the sample exhibits a Tafel slope of 48 mV/dec, maintains a low overpotential of 0.08 V for 250 cycles and a constant current density for 200 hours of test without significant losses and with almost a 100% hydrogen production efficiency. The results obtained proved the remarkable HER performance of the synthesized electrocatalyst, especially in real seawater in virtue of synergistic alloying effects and the presence of the graphene support.



中文翻译:

活性和稳定的支撑石墨烯的三金属合金基电催化剂通过海水裂解制氢

采用海水作为电解质溶液的氢气析出反应(HER)是生产氢气的有希望且更具可持续性的替代方法,但与目前的催化剂相比,它需要更经济,高效和稳定的催化剂。在此,已经提出了通过易于扩展,成本有效,无表面活性剂的方法合成Ni,Ru,Ir基和石墨烯负载的纳米结构催化剂。XRD,SEM,TEM图像和EDX图谱表明,在几层石墨烯上负载的三金属NiRuIr合金纳米颗粒(平均直径:8 nm)形成。表征后,在0.5 MH 2 SO 4中测试样品的HER稳定性和活性,在KCl中性溶液中以及在真正的海水中。在酸性电解质环境中,即使经过11000次循环后,仍可保持0.06 V的超电势,并且记录的Tafel斜率非常低(28 mV / dec)。在中性溶液中,还获得了非常低的过电势(0.10 V)和低Tafel斜率(72 mV / dec)。此外,在真实的海水中,样品的Tafel斜率为48 mV / dec,在250个循环中保持0.08 V的低过电势,并在200小时的测试中保持恒定的电流密度,而没有明显的损耗,并且制氢效率几乎为100%。获得的结果证明了合成的电催化剂具有显着的HER性能,特别是在真实海水中,由于具有协同合金作用和石墨烯载体的存在。

更新日期:2020-01-23
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