Meléndez-González P C, Fuentez-Torres M O, Sánchez-Castro M E, Alonso-Lemus I L, Escobar-Morales B, Pech-Rodríguez W J, Napporn Teko W, Rodríguez-Varela F J
Nanociencias y Nanotecnología, Cinvestav Unidad Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial Ramos Arizpe, Ramos Arizpe, Coahuila C.P 25900, México.
Sustentabilidad de Los Recursos Naturales y Energía, Cinvestav Unidad Saltillo, Ramos Arizpe, Coahuila C.P 25900, México.
ACS Appl Nano Mater. 2024 Aug 20;7(17):20071-20084. doi: 10.1021/acsanm.4c02670. eCollection 2024 Sep 13.
The most widely used support in low-temperature fuel cell applications is the commercially available Vulcan XC-72. Herein, we report its functionalization with the home-obtained mesityl copper (Cu-mes) and Cu coordinate (Cu(dmpz)L2) organometallic compounds. Pd nanoparticles are anchored on the supports obtaining Pd/C, Pd/C, and Pd/C (on nonfunctionalized support). The polarization curves of the ethanol oxidation reaction (EOR) show that Pd/C and Pd/C promote the reaction at a more negative onset potential, i.e., = 0.38 V/reversible hydrogen electrode (RHE), compared to 0.41 V/RHE of Pd/C. The mass current density ( ) delivered by Pd/C is considerably higher (1231.3 mA mg ), followed by Pd/C (1001.8 mA mg ), and Pd/C (808.3 mA mg ). The enhanced performance of Pd/C and Pd/C for the EOR (and tolerance to CO poisoning) is attributed to a shift of their d-band center toward more negative values, compared to Pd/C, because of the formation of PdCu alloyed phases arising from the functionalization. In addition, laboratory-scale tests of the anion exchange membrane-direct ethanol fuel cell assembled with Pd/C show the highest open circuit voltage (OCV = 0.60 V) and cell power density ( = 0.14 mW cm). As a result of its high catalytic activity, Pd/C can find application as an anode nanocatalyst in AEM-DEFCs.
低温燃料电池应用中使用最广泛的载体是市售的Vulcan XC - 72。在此，我们报道了用自制的均三甲苯基铜（Cu - mes）和铜配位（Cu(dmpz)L2）有机金属化合物对其进行功能化处理。钯纳米颗粒锚定在载体上，得到Pd/C、Pd/C和Pd/C（在未功能化载体上）。乙醇氧化反应（EOR）的极化曲线表明，与Pd/C的0.41 V/可逆氢电极（RHE）相比，Pd/C和Pd/C在更负的起始电位（即 = 0.38 V/RHE）下促进反应。Pd/C提供的质量电流密度（ ）相当高（1231.3 mA mg ），其次是Pd/C（1001.8 mA mg ）和Pd/C（808.3 mA mg ）。Pd/C和Pd/C对EOR的性能增强（以及对CO中毒的耐受性）归因于由于功能化形成PdCu合金相，其d带中心相对于Pd/C向更负值移动。此外，用Pd/C组装的阴离子交换膜直接乙醇燃料电池的实验室规模测试显示出最高的开路电压（OCV = 0.6 V）和电池功率密度（ = 0.14 mW cm）。由于其高催化活性，Pd/C可作为阳极纳米催化剂应用于AEM - DEFCs中。
