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Bi-directional modulation of electron transfer and capacitive behavior in sediment microbial fuel cells by hydrochar and acetate

International Journal of Renewable Energy Development : JRED · Vol. 15 No. 5 (2026) · hlm. 1075–1088

DOI
10.61435/ijred.2026.62325
ISSN
2252-4940
Terbit
2026-09-01
Penerbit
Center of Biomass & Renewable Energy (CBIORE)
Bahasa
eng
Lisensi
creativecommons.org/licenses/by-sa/4.0

Abstrak

Marine sediment microbial fuel cells (MS-MFCs) provide a sustainable approach for harvesting energy from benthic environments, but their performance is limited by slow electron-transfer kinetics, unstable power output, and charge-storage capability. This study investigates the coupled kinetic and capacitive enhancement of MS-MFCs through co-modification with biomass-derived hydrochar (HC) and acetate as complementary electron-transfer and metabolic modulators. Four sediment compositions containing 0, 5, 10, and 15% (v/v) HC were operated for 30 days under a 1 kΩ external load, with acetate introduced on Day 21 to stimulate microbial metabolism. Electrochemical behavior was evaluated using cyclic voltammetry, electron-transfer kinetic analysis, current-density monitoring, power-density measurements, and physicochemical characterization of the anolyte. The apparent electron-transfer rate constant (ks) increased from 1.77 s⁻¹ in the unamended control to 3.19 s⁻¹ and 3.49 s⁻¹ in the 10% and 15% HC systems, respectively. Maximum power densities reached 21.8–23.1 mW m⁻², approximately three orders of magnitude higher than the control. Hydrochar also improved redox stability, ionic conductivity, and apparent capacitive behavior by providing a porous, conductive, and pseudocapacitive scaffold that supported microbial attachment and facilitated microbe–electrode coupling. Meanwhile, acetate served as a readily metabolizable carbon source that accelerated microbial activity and enhanced electron delivery to the anode. The strongest performance was observed at 10–15% HC, although the 15% system showed mass-transfer limitations during operation. These findings demonstrate a synergistic relationship between kinetic enhancement, substrate utilization, and capacitive charge buffering, offering a mechanistic basis for designing robust, self-sustaining MS-MFCs for in situ coastal energy recovery and environmental monitoring

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  • Diponegoro University
  • Institut Teknologi Indonesia
  • Universitas Abulyatama
  • State University of Semarang
  • Dong-A University
  • Muhammadiyah University of Surakarta
  • Universitas Gadjah Mada
  • Organisasi lain
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  • Organisasi berbeda
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Tampilkan sebagai tabel
Rekan penulisOrganisasiArtikel bersama
Widayat WidayatDiponegoro University5
Kusmiyati KusmiyatiMuhammadiyah University of Surakarta5
Adi DarmawanDiponegoro University4
Linda Aliffia YoshiInstitut Teknologi Indonesia3
Arnelli ArnelliDiponegoro University3
Arief Taufik BudimanUniversitas Gadjah Mada3
Abdullah AbdullahDiponegoro University3
Dessy AriyantiDiponegoro University3
Athanasia Amanda SeptevaniNational Research and Innovation Agency3
Sri WinarniDiponegoro University2
Windi PermatasariDiponegoro University2
Lia HandayaniUniversitas Abulyatama2
Hendri WidiyandariSebelas Maret University2
Enjarlis EnjarlisInstitut Teknologi Indonesia2
Muhamad Maulana Azimatun NurDiponegoro University2
Apsari Puspita AiniDiponegoro University2
Mohammad Hossein AhmadiUniversity of Shahrood2
Andin Vita AmaliaState University of Semarang1
Tri Retnaningsih SoeprobowatiDiponegoro University1
Rita Dwi RatnaniUniversitas Wahid Hasyim1
W. WidiyantoDiponegoro University1
M. A. AdhiState University of Semarang1
E. G. SavioDiponegoro University1
Izzati KhairunnisaDiponegoro University1
Cut Aja RahmawatiUniversitas Abulyatama1
Nurhayati NurhayatiUniversitas Abulyatama1
Nurhayati NurhayatiPoliteknik Negeri Ujung Pandang1
Azwar ThaibUniversitas Abulyatama1
Icha KhaerunnisaDiponegoro University1
Prima Astuti HandayaniState University of Semarang1
J. JoelianingsihInstitut Teknologi Indonesia1
Didik Setyo WidodoAfiliasi tidak diketahui1
Prisca Putri ElestaDiponegoro University1

Afiliasi berasal dari OpenAlex; metadata OAI-PMH jurnal tidak memuatnya. Penulis tanpa ID OpenAlex dicocokkan berdasarkan nama, sehingga dua orang bisa tergabung atau satu orang bisa terpisah.

Sumber metadata: OAI-PMH (metadata jurnal) https://ijred.cbiore.id/index.php/ijred/oai, pertama di-harvest 8 Nov 2026, terakhir terlihat 8 Nov 2026.
Metadata asli (oai_dc) 
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	<dc:title xml:lang="en-US">Bi-directional modulation of electron transfer and capacitive behavior in sediment microbial fuel cells by hydrochar and acetate</dc:title>
	<dc:creator>Christwardana, Marcelinus</dc:creator>
	<dc:creator>Astuti, Yayuk</dc:creator>
	<dc:creator>Hadiyanto, H.</dc:creator>
	<dc:creator>Maulana, Achmad Yanuar</dc:creator>
	<dc:creator>Khoirunnisa, K.</dc:creator>
	<dc:creator>Dayanti, Dilla</dc:creator>
	<dc:creator>A'intan, Keisya Natania Nur</dc:creator>
	<dc:subject xml:lang="en-US">bioenergy; biomass; marine sediment; energy storage; energy conversion</dc:subject>
	<dc:description xml:lang="en-US">Marine sediment microbial fuel cells (MS-MFCs) provide a sustainable approach for harvesting energy from benthic environments, but their performance is limited by slow electron-transfer kinetics, unstable power output, and charge-storage capability. This study investigates the coupled kinetic and capacitive enhancement of MS-MFCs through co-modification with biomass-derived hydrochar (HC) and acetate as complementary electron-transfer and metabolic modulators. Four sediment compositions containing 0, 5, 10, and 15% (v/v) HC were operated for 30 days under a 1 kΩ external load, with acetate introduced on Day 21 to stimulate microbial metabolism. Electrochemical behavior was evaluated using cyclic voltammetry, electron-transfer kinetic analysis, current-density monitoring, power-density measurements, and physicochemical characterization of the anolyte. The apparent electron-transfer rate constant (ks) increased from 1.77 s⁻¹ in the unamended control to 3.19 s⁻¹ and 3.49 s⁻¹ in the 10% and 15% HC systems, respectively. Maximum power densities reached 21.8–23.1 mW m⁻², approximately three orders of magnitude higher than the control. Hydrochar also improved redox stability, ionic conductivity, and apparent capacitive behavior by providing a porous, conductive, and pseudocapacitive scaffold that supported microbial attachment and facilitated microbe–electrode coupling. Meanwhile, acetate served as a readily metabolizable carbon source that accelerated microbial activity and enhanced electron delivery to the anode. The strongest performance was observed at 10–15% HC, although the 15% system showed mass-transfer limitations during operation. These findings demonstrate a synergistic relationship between kinetic enhancement, substrate utilization, and capacitive charge buffering, offering a mechanistic basis for designing robust, self-sustaining MS-MFCs for in situ coastal energy recovery and environmental monitoring</dc:description>
	<dc:publisher xml:lang="en-US">Center of Biomass &amp; Renewable Energy (CBIORE)</dc:publisher>
	<dc:date>2026-09-01</dc:date>
	<dc:type>info:eu-repo/semantics/article</dc:type>
	<dc:type>info:eu-repo/semantics/publishedVersion</dc:type>
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	<dc:format>application/pdf</dc:format>
	<dc:identifier>https://ijred.cbiore.id/index.php/ijred/article/view/62325</dc:identifier>
	<dc:identifier>10.61435/ijred.2026.62325</dc:identifier>
	<dc:source xml:lang="en-US">International Journal of Renewable Energy Development; Vol 15, No 5 (2026): September 2026; 1075-1088</dc:source>
	<dc:source>2252-4940</dc:source>
	<dc:language>eng</dc:language>
	<dc:relation>https://ijred.cbiore.id/index.php/ijred/article/view/62325/pdf</dc:relation>
	<dc:relation>https://ijred.cbiore.id/index.php/ijred/article/downloadSuppFile/62325/16143</dc:relation>
	<dc:rights xml:lang="en-US">Copyright (c) 2026 The Author(s). Published by Centre of Biomass and Renewable Energy (CBIORE)</dc:rights>
	<dc:rights xml:lang="en-US">https://creativecommons.org/licenses/by-sa/4.0</dc:rights>
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