Flowable Nickel-Loaded Activated Carbon Cathodes for Hydrogen Production in Microbial Electrolysis Cells
- Authors
- Moreno-Jimenez, Daniel A.; Kumaran, Yamini; Efstathiadis, Harry; Hwang, Moon-Hyun; Jeon, Byong-Hun; Kim, Kyoung-Yeol
- Issue Date
- Oct-2023
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Activated carbon flow electrode; Waste to energy; Nonprecious metal catalysts; Hydrogen evolution reaction; Green hydrogen production
- Citation
- ACS ES&T ENGINEERING, v.3, no.10, pp.1476 - 1485
- Indexed
- SCOPUS
- Journal Title
- ACS ES&T ENGINEERING
- Volume
- 3
- Number
- 10
- Start Page
- 1476
- End Page
- 1485
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192955
- DOI
- 10.1021/acsestengg.3c00122
- Abstract
- Microbial electrolysis cells (MECs) can electrochemically produce green hydrogen from waste streams. However, cathode materials have been a bottleneck for the practical application of MECs due to difficulties in scale-up and high costs. To overcome current drawbacks, we have examined a novel flowable cathode in MECs, where nickel-loaded activated carbon (Ni/AC) powders were suspended in a buffering solution as a cathode without electrode fabrication processes. The Ni/AC flow cathode with higher Ni content and minimum Ni/AC loading (4 Ni-atom% and 0.125 wt-AC.%, Ni4/AC0.125) demonstrated the highest catalytic activities (−0.86 V vs Ag/AgCl at −10 A/m2) among Ni/AC flow cathodes tested. This result indicates that pseudocapacitive behavior toward Faradaic reactions can be promoted by increasing Ni loadings on Ni/AC particles. The MEC with a Ni4/AC0.125 flow cathode produced comparable hydrogen production rates (1.62 ± 0.15 L-H2/Lreactor-day) to the Pt control (1.64 ± 0.09 L-H2/L-day) and 40% higher than the blank (only current collector without Ni/AC, 1.29 ± 0.02 L-H2/L-day) at a 4 h cycle. The impacts of carbon black blending remain unclear; there was a 10% increase in hydrogen production rates with the lowest carbon black content (0.06 wt %) in the Ni/AC flow cathode, but hydrogen production rates were not further improved as carbon black content increased.
- Files in This Item
-
Go to Link
- Appears in
Collections - 서울 공과대학 > 서울 자원환경공학과 > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192955)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.