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| 1 | Fabrication of bilayer Pd-Pt nanocages with sub-nanometer thin shells for enhanced hydrogen evolution reaction显示文摘The hydrogen evolution reaction (HER),which generates molecular hydrogen through the electrochemical reduction of water,is an important clean-energy technology.Platinum (Pt) is an ideal material for HER electrocatalysts in terms of low overpotential and fast kinetics.An effective method to improve the atom utilization efficiency of Pt is to fabricate Pt-based core-shell or nanocage structures with ultra-thin walls.This paper describes the construction of bilayer palladium (Pd)-Pt alloy nanocages catalyst with enhanced HER catalytic activity.The nanocages were fabricated by etching away the Pd templates of multishelled nanocubes composed of alternate shells of Pd and Pt with well-defined (100) facets.The bilayer Pd-Pt nanocages with sub-nanometer shells have a high dispersion of the active atoms on the outside and inside surfaces of outer layer and inner layer,respectively.Moreover,the Pd-Pt alloy lowers the overpotential for HER and speeds up the reaction rate of HER due to the synergies between Pd and Pt.The rational design of bilayer nanocages provided a novel route for boosting the atom utilization efficiency of Pt catalysts. | Yihe Wang Lei Zhang Congling Hu Shengnan Yu Piaoping Yang Dongfang Cheng Zhi-Jian Zhao Jinlong Gong | 2019 | Nano Research2019，12，9： | 3 |
| 2 | 多级孔碳材料的制备及其超级电容器性能研究显示文摘超级电容器因其容量大、充放电速度快、循环寿命长、功率密度高、环境污染小以及工作温度范围宽等优点而被广泛关注,可应用于存储再生能量、备用电池和替代电源等众多场景,展现出巨大的应用价值和市场潜力。然而,现有超级电容器较低的能量密度限制了其应用前景,为此研究者们提出了优化电极材料以提高其能量密度的方案。基于此,该研究以生物质——塌地松为碳源,通过高温碳化和氢氧化钾活化制备出性能优异的多级孔碳材料,性能测试证实该材料具有优异的电化学性能(电容:532.0 F/g,能量密度:12.5 Wh/kg,功率密度:5245.6 W/kg)。研究结果表明,高比表面积(3948.6 m^(2)/g)、多级孔结构、均匀孔径分布及杂原子掺杂有利于提高碳材料的比电容,为超级电容器电极材料的选择和制备提供了技术指导。 | 陈野 张一 刘旭坡 高书燕 | 2022 | 功能材料2022，53，4： | 2 |
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