Luo Feng, Wu Jiarui, Chen Xiaojun, Qiao Liang, Feng Wei, Liu Xiaonan, Wu Xiaoqiang
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China.
School of Physics, University of Electronic Science and Technology of China, Chengdu 610054, China.
J Colloid Interface Sci. 2023 Dec;651:9-17. doi: 10.1016/j.jcis.2023.07.130. Epub 2023 Jul 22.
As high-efficiency anode methanol oxidation catalysts, platinum-based materials have always occupied a dominant place since the inception of direct methanol fuel cells (DMFCs). However, because of the strong adsorption of intermediates, Pt-active centers are easily poisoned and induce serious activity loss. Here, we investigate the same commonality of the oxygen evolution reaction (OER) and methanol oxidation reaction (MOR) mechanism in Pt/CrCoNi complex catalysts and establish a relationship between them to help screen appropriate synergistic materials and reduce activity loss. With this strategy, the OER activity of Pt/CrCoNi is modified via temperature and oxygen pressure control, and the OER overpotential and MOR durability show a positive correlation. The MOR performance of the final optimized Pt/CrCoNi (7.5-225 Torr oxygen pressure and 400 °C annealing, OA) film reaches an advanced level in the Pt-based MOR catalysts and shows a mass activity of 3785 A g, as well as a good durability of 50000 s in the alkaline solution.
作为高效的阳极甲醇氧化催化剂，自直接甲醇燃料电池（DMFC）问世以来，铂基材料一直占据主导地位。然而，由于中间体的强吸附作用，铂活性中心容易中毒并导致严重的活性损失。在此，我们研究了铂/铬钴镍复合催化剂中析氧反应（OER）和甲醇氧化反应（MOR）机理的相同共性，并建立它们之间的关系，以帮助筛选合适的协同材料并减少活性损失。通过该策略，通过温度和氧气压力控制来调节铂/铬钴镍的OER活性，且OER过电位与MOR耐久性呈正相关。最终优化的铂/铬钴镍（7.5 - 225托氧气压力和400°C退火，OA）薄膜的MOR性能在铂基MOR催化剂中达到先进水平，在碱性溶液中表现出3785 A g的质量活性以及50000 s的良好耐久性。
