Chen Xiang, Zhang Xiuhui, Chen Chunguang, Huang Tao, Yu Aishui
Laboratory of Advanced Materials, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University Shanghai 200433 China.
Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, Collaborative Innovation Center of Chemistry for Energy Materials, Fudan University Shanghai 200433 China
RSC Adv. 2018 Jul 2;8(42):23973-23980. doi: 10.1039/c8ra04144j. eCollection 2018 Jun 27.
We use SiO as a template and dopamine as a carbon source to synthesize a hollow C shell, and we load Co and Ru nanoparticles onto it to obtain a Co-Ru@C shell composite. The diameter and thickness of the C shell are 100 nm and 5-10 nm, respectively, and numerous holes of different sizes exist on the C shell. Meanwhile, numerous C shells stack together to form macropores, thereby forming a hierarchical porous structure in the material. Brunauer-Emmett-Teller surface area analysis reveals that the specific surface area and pore volume of the Co-Ru@C shell are 631.57 m g and 2.20 cc g, respectively, which can result in many three-phase interfaces and provide more space for the deposition of discharge products. Compared with Co@C shell and C shell electrodes, the obtained Co-Ru@C shell-based electrodes exhibit the highest discharge capacity, the lowest oxygen reduction reaction/oxygen evolution reaction overpotential and the best cycle stability, indicating the excellent catalytic ability of the Co-Ru@C shell.
我们以二氧化硅为模板，多巴胺为碳源合成中空碳壳，并在其上负载钴和钌纳米颗粒，得到Co-Ru@C壳复合材料。碳壳的直径和厚度分别为100nm和5-10nm，且碳壳上存在许多不同尺寸的孔洞。同时，大量碳壳堆叠在一起形成大孔，从而在材料中形成分级多孔结构。布鲁诺尔-埃米特-泰勒表面积分析表明，Co-Ru@C壳的比表面积和孔体积分别为631.57 m²/g和2.20 cc/g，这可产生许多三相界面，并为放电产物的沉积提供更多空间。与Co@C壳电极和碳壳电极相比，所制备的基于Co-Ru@C壳的电极表现出最高的放电容量、最低的氧还原反应/析氧反应过电位以及最佳的循环稳定性，表明Co-Ru@C壳具有优异的催化能力。
