华中科技大学夏宝玉团队报道了用于高效氧还原的金属-氮-石墨烯中铂合金的可扩展熔盐合成策略。相关研究成果于2021年12月10日发表于国际顶尖学术期刊《德国应用化学》。

燃料电池被认为是一种有希望的替代现有传统能源系统的可持续发展的未来能源。然而，合成高效、稳定的铂基催化剂仍然是其实际应用的一个挑战。

该文中，研究人员提出了一种简单且可扩展的熔盐合成方法，用于制备注入金属氮石墨烯的低铂（Pt）纳米合金。所制备的低铂合金石墨烯具有1.29A mgPt-1的高氧还原活性和超过30000次电位循环的优异耐久性。石墨烯包裹的铂纳米合金的催化剂纳米结构由于强大的金属-载体相互作用提供了强大的抗纳米颗粒迁移和腐蚀能力。

先进的表征和理论计算表明，铂合金石墨烯中的多个活性中心协同作用，改善了氧还原。该研究工作不仅为集成催化剂提供了一种高效、稳定的低铂催化剂，而且为集成催化剂提供了一种简便的设计思路和可扩展的制备技术，从而在燃料电池等领域获得更广泛的应用。

附：英文原文

Title: Scalable Molten Salt Synthesis of Platinum Alloys Planted in Metal-Nitrogen-Graphene for Efficient Oxygen Reduction

Author: Bao Yu Xia, Shahid Zaman, Ya-Qiong Su, Chung-Li Dong, Ruijuan Qi, Lei Huang, Yanyang Qin, Yu-Cheng Huang, Fu-min Li, Bo You, Wei Guo, Qing Li, Shujiang Ding

Issue&Volume: 2021-12-10

Abstract: Fuel cells are considered as a promising alternative to the existing traditional energy systems towards sustainable future. Nevertheless, the synthesis of efficient and robust Pt-based catalysts remains a challenge for practical applications. In this work, we present a simple and scalable molten-salt synthesis method for producing a low-platinum (Pt) nanoalloy implanted in metal-nitrogen-graphene. The as-prepared low-Pt alloyed graphene exhibits a high oxygen reduction activity of 1.29 A mgPt-1 and excellent durability over 30,000 potential cycles. The catalyst nanoarchitecture of graphene encased Pt nanoalloy provides a robust capability against nanoparticle migration and corrosion due to strong metal-support interaction. Similarly, advanced characterizations and theoretical calculations show that the multiple active sites in platinum alloyed graphene synergistically account for improved oxygen reduction. This work not only provides an efficient and robust low-Pt catalyst but also a facile design idea and scalable preparation technique for integrated catalysts to achieve more profound applications in fuel cells and beyond.

DOI: 10.1002/anie.202115835

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115835