The high-performance and mechanism of P-doped activated carbon as a catalyst for air-cathode microbial fuel cells

Yunting Liu, Kexun Li, Yi Liu, Liangtao Pu, Zhihao Chen, Shuguang Deng

Research output: Contribution to journalArticle

56 Scopus citations

Abstract

We report phosphorus (P)-doped activated carbon (AC) as a highly active catalyst for the oxygen reduction reaction (ORR) in air-cathode microbial fuel cells (MFCs). P-doped AC was prepared by impregnating AC with H3PO4 (1 M) and then heating at 200°C, 400°C, 600°C, 800°C and 1000°C, respectively in the presence of nitrogen. The pretreatment of AC increased the power density of MFCs by 75% from 730 ± 23 mW m-2 (RAW-SP, untreated AC) to 1278 ± 56 mW m-2 (SP-800, heated at 800°C). X-ray photoelectron spectroscopy (XPS) analysis confirmed the successful doping of P in all treated samples, and the introduction of oxygen-containing groups contributed to the increase of power densities and ORR performance. Raman spectra analysis indicated that the AC structure was deformed by the doped P atom. According to X-ray diffraction (XRD) and transmission electron microscopy (TEM), the treated samples revealed a higher graphitization degree than the control. The results of electrochemical impedance spectroscopy (EIS) also showed that the introduction of the P heteroatom reduced the total resistance, which contributed to the improved electrochemical performance. However, high temperature could destroy the AC's structure, which led to the decline of BET surface area and micropore volume. Thus, P-doped AC would be a promising electrocatalyst for the ORR in MFCs.

Original languageEnglish (US)
Pages (from-to)21149-21158
Number of pages10
JournalJournal of Materials Chemistry A
Volume3
Issue number42
DOIs
StatePublished - Sep 9 2015
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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