Lee Unho, Lee You Na, Yoon Young Soo
Materials Science and Engineering, Gachon University, Seongnam-si, South Korea.
Front Chem. 2020 Oct 19;8:777. doi: 10.3389/fchem.2020.00777. eCollection 2020.
An anode bimetallic catalyst comprising Ni-Pd alloy nanoparticles was loaded on acid-treated multi-walled carbon nanotubes (MWCNTs) for application in a direct urea fuel cell. The bimetallic catalyst and MWCNTs were synthesized by a hydrothermal method at 160°C for 5 h. To reduce the catalyst particle size, alkaline resistance, and facilitate their uniform distribution on the surface of the MWCNTs, phosphorus (P) was added to the Ni-Pd/MWCNT catalyst. The effects of P on the distribution and reduction in size of catalyst particles were investigated by Brunauer-Emmett-Teller analysis, transmission electron microscopy, and X-ray diffraction analysis. The enhanced catalytic activity and durability of the P-containing catalyst was confirmed by the high current density [1897.76 mA/cm (vs. Ag/AgCl)] obtained at 0.45 V in a 3 M KOH/1.0 M urea alkaline aqueous solution compared with that of the catalyst without P [604.87 mA/cm (vs. Ag/AgCl)], as determined by cyclic voltammetry and chronoamperometry. A Urea-O fuel cell assembled with a membrane electrode assembly comprising the Ni-Pd(P)/MWCNT catalyst delivered peak power densities of 0.756 and 3.825 mW/cm at 25 and 60°C, respectively, in a 3 M KOH/1 M urea solution.
一种包含镍 - 钯合金纳米颗粒的阳极双金属催化剂被负载在经过酸处理的多壁碳纳米管（MWCNT）上，用于直接尿素燃料电池。双金属催化剂和MWCNT通过水热法在160°C下合成5小时。为了减小催化剂粒径、提高耐碱性并促进其在MWCNT表面均匀分布，向Ni-Pd/MWCNT催化剂中添加了磷（P）。通过布鲁诺尔 - 埃米特 - 泰勒分析、透射电子显微镜和X射线衍射分析研究了P对催化剂颗粒分布和粒径减小的影响。通过循环伏安法和计时电流法测定，在3M KOH/1.0M尿素碱性水溶液中，含P催化剂在0.45V时获得的高电流密度[1897.76mA/cm²（相对于Ag/AgCl）]证实了其增强的催化活性和耐久性，而不含P的催化剂的电流密度为[604.87mA/cm²（相对于Ag/AgCl）]。在3M KOH/1M尿素溶液中，由包含Ni-Pd(P)/MWCNT催化剂的膜电极组件组装的尿素 - O燃料电池在25°C和60°C时分别提供了0.756和3.825mW/cm²的峰值功率密度。
