Nanoporous Heteroatom-Doped Carbons Derived from Cotton Waste: Efficient Hydrazine Oxidation Electrocatalysts

Taís L. Silva, André L. Cazetta, Tao Zhang, Katherine Koh, Rafael Silva, Teddy Asefa, Vitor C. Almeida

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this work, cotton-based denim waste is successfully used as a precursor to synthesize nanoporous P- and N-co-doped carbon materials that can serve as efficient electrocatalysts for the hydrazine oxidation reaction (HzOR). In the synthesis, the cotton denim waste is mixed with H 3 PO 4 in two different denim/H 3 PO 4 (wt/vol) ratios, namely, 1:1 and 1:3, wherein H 3 PO 4 serves as both an activating agent and a source of P dopant atoms while the indigo carmine dye present in denim serves as a source of N dopant atoms to the carbon materials. The resulting P- and N-co-doped carbon materials, named PNC1 and PNC3, respectively, are characterized by various analytical techniques. The XPS spectra show that PNC1 has ca. 2.17 atomic % P and 1.95 atomic % N whereas PNC3 has 2.54 atomic % P and 0.71 atomic % N. Pore analyses by N 2 porosimetry indicate that PNC1 has a higher surface area (1582 m 2 g -1 ) than PNC3 (486 m 2 g -1 ), although the former has a lower mesopore volume (0.39 cm 3 g -1 ) than the latter (0.58 cm 3 g -1 ). The SEM images of the two materials also show some notable structural differences. The results overall indicate that the structures and compositions of the materials can be easily tailored by varying the ratio of denim/H 3 PO 4 in the precursor. The electrocatalytic activities of PNC1 and PNC3 toward HzOR were then evaluated, and PNC3 is found to be a better electrocatalyst than PNC1. In a 100 mmol L -1 hydrazine solution in phosphate buffer saline (PBS) at pH 7.4, PNC3 electrocatalyzes the reaction at a lower peak potential (ca. 0.70 V vs RHE) than PNC1 (ca. 0.77 V vs RHE). Additionally, the current density obtained during HzOR over PNC3 is higher (by 1.29 times) than the one obtained over PNC1. Furthermore, the onset potential by which PNC3 electrocatalyzes HzOR (0.42 V vs RHE) is comparable to or better than the values reported for some of the best HzOR electrocatalysts in the literature. Besides their high electrocatalytic activity, the materials remain stable during electrocatalysis of HzOR.

Original languageEnglish
Pages (from-to)2313-2323
Number of pages11
JournalACS Applied Energy Materials
Volume2
Issue number3
DOIs
Publication statusPublished - Mar 25 2019

Fingerprint

hydrazine
Electrocatalysts
Hydrazine
Cotton
Carbon
Oxidation
Doping (additives)
Indigo Carmine
Electrocatalysis
Atoms

Keywords

  • cotton denim
  • electrocatalysis
  • hydrazine oxidation
  • metal-free electrocatalyst
  • P-N-doped carbon

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Chemical Engineering (miscellaneous)
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering

Cite this

Nanoporous Heteroatom-Doped Carbons Derived from Cotton Waste : Efficient Hydrazine Oxidation Electrocatalysts. / Silva, Taís L.; Cazetta, André L.; Zhang, Tao; Koh, Katherine; Silva, Rafael; Asefa, Teddy; Almeida, Vitor C.

In: ACS Applied Energy Materials, Vol. 2, No. 3, 25.03.2019, p. 2313-2323.

Research output: Contribution to journalArticle

Silva, Taís L. ; Cazetta, André L. ; Zhang, Tao ; Koh, Katherine ; Silva, Rafael ; Asefa, Teddy ; Almeida, Vitor C. / Nanoporous Heteroatom-Doped Carbons Derived from Cotton Waste : Efficient Hydrazine Oxidation Electrocatalysts. In: ACS Applied Energy Materials. 2019 ; Vol. 2, No. 3. pp. 2313-2323.
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abstract = "In this work, cotton-based denim waste is successfully used as a precursor to synthesize nanoporous P- and N-co-doped carbon materials that can serve as efficient electrocatalysts for the hydrazine oxidation reaction (HzOR). In the synthesis, the cotton denim waste is mixed with H 3 PO 4 in two different denim/H 3 PO 4 (wt/vol) ratios, namely, 1:1 and 1:3, wherein H 3 PO 4 serves as both an activating agent and a source of P dopant atoms while the indigo carmine dye present in denim serves as a source of N dopant atoms to the carbon materials. The resulting P- and N-co-doped carbon materials, named PNC1 and PNC3, respectively, are characterized by various analytical techniques. The XPS spectra show that PNC1 has ca. 2.17 atomic {\%} P and 1.95 atomic {\%} N whereas PNC3 has 2.54 atomic {\%} P and 0.71 atomic {\%} N. Pore analyses by N 2 porosimetry indicate that PNC1 has a higher surface area (1582 m 2 g -1 ) than PNC3 (486 m 2 g -1 ), although the former has a lower mesopore volume (0.39 cm 3 g -1 ) than the latter (0.58 cm 3 g -1 ). The SEM images of the two materials also show some notable structural differences. The results overall indicate that the structures and compositions of the materials can be easily tailored by varying the ratio of denim/H 3 PO 4 in the precursor. The electrocatalytic activities of PNC1 and PNC3 toward HzOR were then evaluated, and PNC3 is found to be a better electrocatalyst than PNC1. In a 100 mmol L -1 hydrazine solution in phosphate buffer saline (PBS) at pH 7.4, PNC3 electrocatalyzes the reaction at a lower peak potential (ca. 0.70 V vs RHE) than PNC1 (ca. 0.77 V vs RHE). Additionally, the current density obtained during HzOR over PNC3 is higher (by 1.29 times) than the one obtained over PNC1. Furthermore, the onset potential by which PNC3 electrocatalyzes HzOR (0.42 V vs RHE) is comparable to or better than the values reported for some of the best HzOR electrocatalysts in the literature. Besides their high electrocatalytic activity, the materials remain stable during electrocatalysis of HzOR.",
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AU - Cazetta, André L.

AU - Zhang, Tao

AU - Koh, Katherine

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AU - Almeida, Vitor C.

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