锰
催化作用
电池(电)
质子交换膜燃料电池
燃料电池
阴极
部分
功率密度
化学
氧气
材料科学
密度泛函理论
锌
无机化学
化学工程
物理化学
计算化学
冶金
立体化学
功率(物理)
有机化学
物理
热力学
工程类
作者
Xue Bai,Yin Wang,Jingyi Han,Xiaodi Niu,Jingqi Guan
标识
DOI:10.1016/j.apcatb.2023.122966
摘要
Single-atom manganese catalysts possess high stability in the oxygen reduction reaction (ORR) due to their lower Fenton reaction activity. Here, we employ N- and S-co-coordination strategy to modulate the microstructural Mn sites towards high-efficiency ORR. The fabricated Mn-N/S-C catalyst with isolated Mn-N2S2 sites demonstrates a positive half-wave potential of 0.91 V for the ORR. The fabricated zinc–air battery with Mn-N/S-C as the cathode affords a maximal power density of 193 mW cm−2 and superior output stability. Moreover, the maximal power density is increased by 1.53 times compared with S-free Mn-N-C catalyst in anion exchange membrane fuel cells (AEMFCs). Both experimental characterizations and theoretical simulations unveil that the main active sites in the Mn-N/S-C should be Mn-N2S2 moiety embedded into the graphene framework (Mn-N2S2G). Further computational results demonstrate that the S atom doping and asymmetry of structure lead to higher ORR activities of ortho-Mn-N2S2G than Mn-N4G, Mn-N3SG, para-Mn-N2S2G and Mn-NS3G.
科研通智能强力驱动
Strongly Powered by AbleSci AI