Effects of carbon pretreatment for oxygen reduction in alkaline electrolyte

Pirjamali, M.; Kiros, Yohannes

doi:10.1016/s0378-7753(02)00219-7

Cited by 27 publications

(12 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Good cathode performance probably originates from the presence of activated electrochemically active functional groups (e.g. carboxylic, carbonyl and carboxyl radicals) on the granule surface for effective electrocatalytical reduction of oxygen 22. In contrast, reducing HRT to 4.2 h resulted in a large decrease in cathode potential from + 470 mV to + 210 mV and a comparable mild increase in anode potential (−310 mV to + 50 mV; Fig.…”

Section: Resultsmentioning

confidence: 96%

Development of microbial fuel cell with anoxic/oxic design for treatment of saline seafood wastewater and biological electricity generation

You

Zhang

Yuan

et al. 2010

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 96%

Development of microbial fuel cell with anoxic/oxic design for treatment of saline seafood wastewater and biological electricity generation

You

Zhang

Yuan

et al. 2010

J of Chemical Tech & Biotech

View full text Add to dashboard Cite

“…52 Pretreatment of carbon powder using HNO 3 , NH 3 , fluoric acid, formic acid, H 2 , N 2 , CO 2 , as well as thermal treatment, also has a significant effect on the ORR activity, stability, and selectivity of the resulting catalysts. 56,57 The effect of the C support on the en-derived catalyst is shown in Fig. 9.…”

Section: B596mentioning

confidence: 99%

Effect of Preparation Conditions of Sol–Gel-Derived Co–N–C-Based Catalysts on ORR Activity in Acidic Solutions

Sirk

Campbell

Birss

2008

J. Electrochem. Soc.

View full text Add to dashboard Cite

Using a Co oxide ethanol-based sol as a precursor solution, nitrogen ͑N͒-and carbon ͑C͒-containing ligands ͓1,2 phenylene diamine ͑phen͒ and ethylene diamine ͑en͔͒ were added to produce an oxygen reduction reaction ͑ORR͒ catalyst precursor. After adsorption on carbon powder, heat-treatment in an inert atmosphere at 500-900°C, and the addition of Nafion as a binder, the powdered mixture was coated on a glassy carbon electrode and evaluated for its ORR activity in 0.5 M H 2 SO 4 . The catalystcarbon powder ratio, heat-treatment temperature, ligand type, and ligand:Co ratio were optimized, and the effect of increased catalyst layer thickness, particle size, and C support was also determined. It was concluded that a phen-based catalyst with a metal to ligand ratio of 1:2, a heat-treatment at 900°C, and a concentration of 4 wt % Co was the most active, selective, and stable ORR catalyst material of the materials developed in the present work. X-ray photoelectron spectroscopy and X-ray diffraction analysis showed the formation of both Co metal and CoN 4 units upon heat-treatment, with the most active catalyst having a 5.3:1 overall N-Co ratio.

show abstract

“…Then, the filtered wet mass was rolled over to a defined thickness of 0.7 mm on a-nickel wire (100 mesh). The electrode was compressed (375 kg cm −2 ) and dried in N2 atmosphere and sintered at 325 • C for 30 min [36,37]. The tested electrodes are specified as shown in Table 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

Electrochemical Performance and in Operando Charge Efficiency Measurements of Cu/Sn-Doped Nano Iron Electrodes

et al. 2018

Self Cite

View full text Add to dashboard Cite

Fe-air or Ni-Fe cells can offer low-cost and large-scale sustainable energy storage. At present, they are limited by low coulombic efficiency, low active material use, and poor rate capability. To overcome these challenges, two types of nanostructured doped iron materials were investigated: (1) copper and tin doped iron (CuSn); and (2) tin doped iron (Sn). Single-wall carbon nanotube (SWCNT) was added to the electrode and LiOH to the electrolyte. In the 2 wt. % Cu + 2 wt. % Sn sample, the addition of SWCNT increased the discharge capacity from 430 to 475 mAh g−1, and charge efficiency increased from 83% to 93.5%. With the addition of both SWCNT and LiOH, the charge efficiency and discharge capacity improved to 91% and 603 mAh g−1, respectively. Meanwhile, the 4 wt. % Sn substituted sample performance is not on par with the 2 wt. % Cu + 2 wt. % Sn sample. The dopant elements (Cu and Sn) and additives (SWCNT and LiOH) have a major impact on the electrode performance. To understand the relation between hydrogen evolution and charge current density, we have used in operando charging measurements combined with mass spectrometry to quantify the evolved hydrogen. The electrodes that were subjected to prolonged overcharge upon hydrogen evolution failed rapidly. This insight could help in the development of better charging schemes for the iron electrodes.

show abstract

Effects of carbon pretreatment for oxygen reduction in alkaline electrolyte

Cited by 27 publications

References 22 publications

Development of microbial fuel cell with anoxic/oxic design for treatment of saline seafood wastewater and biological electricity generation

Development of microbial fuel cell with anoxic/oxic design for treatment of saline seafood wastewater and biological electricity generation

Effect of Preparation Conditions of Sol–Gel-Derived Co–N–C-Based Catalysts on ORR Activity in Acidic Solutions

Electrochemical Performance and in Operando Charge Efficiency Measurements of Cu/Sn-Doped Nano Iron Electrodes

Contact Info

Product

Resources

About