Nickel powder blended activated carbon cathodes for hydrogen production in microbial electrolysis cells

Kyoung Yeol Kim, Bruce Ernest Logan

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Although pure Ni catalysts can achieve a hydrogen production rate similar to Pt in microbial electrolysis cells (MECs), a reduction in the amount of Ni used is needed to reduce the cost. In this study, nickel powder (pNi)was blended with activated carbon (AC)to reduce the mass of Ni used, while improving catalytic activity for the hydrogen evolution reaction (HER)by increasing the active surface area. Ni powder blended AC cathodes (AC-pNi)were fabricated at different nickel powder loadings (4.8, 19, 46 mg/cm2 with AC and 77 mg/cm2 without AC as control). AC-pNi4.8 (Ni loading: 4.8 mg/cm2)produced higher hydrogen production rates (0.38 ± 0.04 L-H2/L-d)than pNi77 (0.28 ± 0.02 L-H2/L-d)with a 16 times less Ni loading. Cathodic hydrogen recovery of using the AC-pNi4.8 (98 ± 5%)was also higher than pNi77 (82 ± 4%), indicating catalytic activities were improved by AC blending. Nickel dissolution into the catholyte after completion of each cycle was negligible for AC-pNi4.8 (<0.2 mg/L), while Ni dissolution was detected for pNi77 (5–10 mg/L). These results indicate that AC blending with Ni powder can improve hydrogen production in MECs while minimizing the amount of Ni in the cathode.

Original languageEnglish (US)
Pages (from-to)13169-13174
Number of pages6
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number26
DOIs
StatePublished - May 21 2019

Fingerprint

Regenerative fuel cells
hydrogen production
activated carbon
electrolysis
Hydrogen production
Activated carbon
Cathodes
cathodes
Nickel
nickel
Powders
cells
catalytic activity
Catalyst activity
dissolving
Dissolution
Hydrogen
hydrogen

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "Nickel powder blended activated carbon cathodes for hydrogen production in microbial electrolysis cells",
abstract = "Although pure Ni catalysts can achieve a hydrogen production rate similar to Pt in microbial electrolysis cells (MECs), a reduction in the amount of Ni used is needed to reduce the cost. In this study, nickel powder (pNi)was blended with activated carbon (AC)to reduce the mass of Ni used, while improving catalytic activity for the hydrogen evolution reaction (HER)by increasing the active surface area. Ni powder blended AC cathodes (AC-pNi)were fabricated at different nickel powder loadings (4.8, 19, 46 mg/cm2 with AC and 77 mg/cm2 without AC as control). AC-pNi4.8 (Ni loading: 4.8 mg/cm2)produced higher hydrogen production rates (0.38 ± 0.04 L-H2/L-d)than pNi77 (0.28 ± 0.02 L-H2/L-d)with a 16 times less Ni loading. Cathodic hydrogen recovery of using the AC-pNi4.8 (98 ± 5{\%})was also higher than pNi77 (82 ± 4{\%}), indicating catalytic activities were improved by AC blending. Nickel dissolution into the catholyte after completion of each cycle was negligible for AC-pNi4.8 (<0.2 mg/L), while Ni dissolution was detected for pNi77 (5–10 mg/L). These results indicate that AC blending with Ni powder can improve hydrogen production in MECs while minimizing the amount of Ni in the cathode.",
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Nickel powder blended activated carbon cathodes for hydrogen production in microbial electrolysis cells. / Kim, Kyoung Yeol; Logan, Bruce Ernest.

In: International Journal of Hydrogen Energy, Vol. 44, No. 26, 21.05.2019, p. 13169-13174.

Research output: Contribution to journalArticle

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AB - Although pure Ni catalysts can achieve a hydrogen production rate similar to Pt in microbial electrolysis cells (MECs), a reduction in the amount of Ni used is needed to reduce the cost. In this study, nickel powder (pNi)was blended with activated carbon (AC)to reduce the mass of Ni used, while improving catalytic activity for the hydrogen evolution reaction (HER)by increasing the active surface area. Ni powder blended AC cathodes (AC-pNi)were fabricated at different nickel powder loadings (4.8, 19, 46 mg/cm2 with AC and 77 mg/cm2 without AC as control). AC-pNi4.8 (Ni loading: 4.8 mg/cm2)produced higher hydrogen production rates (0.38 ± 0.04 L-H2/L-d)than pNi77 (0.28 ± 0.02 L-H2/L-d)with a 16 times less Ni loading. Cathodic hydrogen recovery of using the AC-pNi4.8 (98 ± 5%)was also higher than pNi77 (82 ± 4%), indicating catalytic activities were improved by AC blending. Nickel dissolution into the catholyte after completion of each cycle was negligible for AC-pNi4.8 (<0.2 mg/L), while Ni dissolution was detected for pNi77 (5–10 mg/L). These results indicate that AC blending with Ni powder can improve hydrogen production in MECs while minimizing the amount of Ni in the cathode.

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