Novel Strontium/Iron Bimetallic Carbon Composites as Synergistic Catalyst for Oxygen Reduction Reaction in Microbial Fuel Cells

Novel Strontium/Iron Bimetallic Carbon Composites as Synergistic Catalyst for Oxygen Reduction Reaction in Microbial Fuel Cells
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新型锶/铁双金属碳复合材料作为微生物燃料电池氧还原反应的协同催化剂

DOI:
10.1007/s12678-021-00679-2
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发表时间:
2021-09
期刊:
影响因子:
3.1
通讯作者:
Su Minhua
Su Minhua
中科院分区:
化学4区
文献类型:
--
作者:
You Henghui;Shi Huihui;Arulmani Samuel Raj Babu;Li Han;Zhong Kengqiang;Wang Yan;Dai Yi;Huang Lei;Guo Fei;Zhang Hongguo;Yan Jia;Xiao Tangfu;Liu Xianjie;Su Minhua

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摘要:开发具有优异稳定性和创新活性的非贵金属(NNM)电催化剂对于微生物燃料电池(MFC)中的氧还原反应(ORR)至关重要,这是一种有前途的能量转换技术。 在此,提出通过双金属前驱体(Sr和Fe)热解制备碳化铁电催化剂(SrCO3/Fe3C)作为实现ORR高活性电催化剂的可行策略。基于Sr基材料的催化潜力,Fe物种掺杂可以为ORR提供更多有益的活性位点。简而言之,SrCO3/Fe3C(1:12) 催化剂在 0.1-M KOH 溶液中实现了 0.197 V(相对于 Ag/AgCl)的起始电位,优于 Pt/C 催化剂(0.193 V 相对于 Ag/AgCl),半波电位为 −0.157 V(相对于 Ag/AgCl)。此外,该电催化剂表现出近四电子途径,并产生低于3%的H2O2。与Pt/C催化剂相比,它具有更好的稳定性和优异的甲醇耐受性。此外,碳布上以 SrCO3/Fe3C(1:12) 作为催化剂的复合电极在 MFC 中表现出优异的空气阴极,功率密度为 398.98 mW m−2,其性能优于 MFC 上的 10 wt% Pt/C 催化剂 (342.13 mW m−2)。
AbstractIt is critical to develop non-noble metal (NNM) electrocatalysts with excellent stability and innovative activity for oxygen reduction reaction (ORR) in the microbial fuel cells (MFCs), which is a promising energy conversion technology. Herein, the preparation of iron carbide electrocatalysts (SrCO3/Fe3C) by the pyrolysis of a bimetal precursor (Sr and Fe) is proposed as a feasible strategy to realize a highly active electrocatalyst for ORR. Based on the catalytic potential of Sr-based materials, Fe species doping can provide more beneficial active sites for ORR. Concisely, the SrCO3/Fe3C(1:12) catalyst achieves the onset potential of 0.197 V (vs. Ag/AgCl) superior than Pt/C catalyst (0.193 V vs. Ag/AgCl) and the half-wave potential of −0.157 V (vs. Ag/AgCl) in 0.1-M KOH solution. Furthermore, the electrocatalyst exhibits nearly four-electron pathway, and generates less than 3% H2O2. Compared with Pt/C catalyst, it possesses preferable stability and superior methanol tolerance. Moreover, a composite electrode with SrCO3/Fe3C(1:12) as a catalyst on the carbon cloth demonstrated a superb air cathode in MFCs with a power density of 398.98 mW m−2, which can outperform than 10 wt% Pt/C catalysts (342.13 mW m−2) on MFCs.Graphical abstract
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