Freestanding Pt nanosheets with high porosity and improved electrocatalytic performance toward the oxygen reduction reaction

• 作者: Chuang Fan Lin Xu Tianyang Shen Xianyu Hu Xiaojun Wang Yawen Tang Zhaoping Shi Zihan Huang
• 来源期刊: 绿色能源与环境：英文版
• 学科: 工学
• 关键词: PLATINUM NaCl TEMPLATE POROUS NANOSHEETS Oxygen reduction reaction
• 年，卷（期）: 2018,（4）
• 页码范围: 310-317
• 页数: 8页
• 分类号: TM911.4

摘要

Because of the intriguing electronic properties, high specific surface areas and confinement effect, two-dimensional(2D) noble metal nanosheets usually exhibit fascinating physicochemical properties and thus hold great promises in fuel cell devices and beyond. Herein, 2D porous Pt nanosheets composed by interweaved ultrathin nanowires are successfully fabricated via a facile NaCl-templated process. Controlled experiments demonstrate that the adoption of NaCl and appropriate ratio of NaCl and Pt precursor are indispensable for the formation of porous Pt nanosheets. Impressively, the cost-effective NaCl template can be recyclable through a simple recrystallization procedure, which may greatly reduce the synthetic cost. By virtue of their structural merits, including high porosity, 2D anisotropy and abundant defects, the resultant porous Pt nanosheets exhibit superior activity and enhanced stability towards the oxygen reduction reaction(ORR) compared to the commercial Pt black in alkaline medium. The present study not only offers a high-performance electrocatalyst for fuel cell devices, but also provides a new perspective toward the rational synthesis of 2D noble metal nanosheets with high porosity and diverse functionalities.