Jintao Sun, Yunpeng Ju, Naibao Huang, Mengqi Bi, Zhen Gao, M. Tang, Wan Li, Xiannian Sun, Guogang Yang
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引用次数: 0
摘要
开发高性能阴离子交换膜燃料电池需要稳定、高活性的氧还原(ORR)催化剂。为了制备用于 ORR 的廉价而高效的多孔碳材料,我们通过热解枯草芽孢杆菌合成了掺杂杂原子的碳纳米棒。得到的碳材料保持了枯草芽孢杆菌原始纳米棒的均匀分布,并具有固有的掺杂杂原子。获得的 BS-2.0 具有最大的比表面积(209.04 m2 g-1)和最大的内径/内径比(1.0372)。其起始电位(0.93 V vs. RHE)和半波电位(0.81 V vs. RHE)接近 20% 的商用 Pt/C,极限电流密度为 3.98 mA cm-2@1600 rpm。同时,BS-2.0 的循环电位稳定性和甲醇耐受性均高于 20% 的商用铂/铂。BS-2.0固有的异质原子、分布均匀的纳米棒、丰富的孔隙分布和较大的比表面积造就了其优异的电化学性能。
Bacillus Subtilis-Derived Carbon Nanorods as Efficient ORR Electrocatalysts
Developing high-performance anion-exchange membrane fuel cells requires stable and highly active oxygen reduction (ORR) catalysts. To fabricate cheap and efficient porous carbon materials for ORR, heteroatom-doped carbon nanorods were synthesized by pyrolyzing Bacillus subtilis. The obtained carbon material maintained the uniformly distributed nanorods as original Bacillus subtilis and had inherent doped heteroatom. The obtained BS-2.0 had the highest specific surface area (209.04 m2 g-1) and the maximum ID/IG (1.0372). Its starting potential (0.93 V vs. RHE) and semi-wave potential (0.81 V vs. RHE) were close to 20% commercial Pt/C, and its ultimate current density was 3.98 mA cm-2@1600 rpm. Meanwhile, the stability of cycling potentiates polarization, and methanol tolerance of BS-2.0 were all greater than 20% commercial Pt/C. It was the inherent heteroatom, well-distributed nanorods, abundant pore distribution, and large surface area that contributed to its excellent electrochemical performance.