CoMo/SS Cathode Catalyst for Enhanced Hydrogen Production in Microbial Electrolysis Cells

• Published in: Catalysts Vol. 15; no. 5; p. 439
• Main Authors: Lei, Gao, Wang, Yaoqiang, Xiao, Gang, Su, Haijia
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.05.2025
• Subjects: Alloys; Alternative energy sources; Carbon; Catalysts; Cathodes; Charge transfer; Clean energy; Cobalt; Current density; Efficiency; Electrochemical analysis; Electrolysis; Electrolytes; Electrolytic cells; Energy consumption; Energy industry; Energy resources; Fermentation; Force and energy; Fossil fuels; Green technology; Hydrogen; Hydrogen as fuel; Hydrogen evolution reactions; Hydrogen production; Metals; Microorganisms; Molybdenum; Molybdenum alloys; Nickel; Renewable resources; Spectrum analysis; Stainless steel; Technology application; Massachusetts; China
• DOI: 10.3390/catal15050439
• ISSN: 2073-4344

Hydrogen energy has emerged as a pivotal clean energy solution due to its sustainability and zero-emission potential. Microbial electrolysis cells are a promising technology for renewable hydrogen production, typically relying on expensive and unstable Pt/C catalysts for the hydrogen evolution reaction (HER). To address these limitations, this study develops a cost-effective and durable alternative approach. A cobalt–molybdenum (Co-Mo) alloy catalyst (denoted as CoMo/SS) was synthesized via a one-step electrodeposition method on 1000-mesh 316L stainless steel at a current density of 30 mA·cm−2 for 80 min, using an electrolyte with a Co-to-Mo ratio of 1:1. The electrochemical properties and hydrogen evolution performance of this catalyst in a microbial electrolysis cell were evaluated. Key results demonstrate that the CoMo/SS catalyst achieves a good catalytic performance of hydrogen evolution. The CoMo/SS cathode catalyst only requires an overpotential of 91.70 mV (vs. RHE) to reach a current density of 10 mA·cm−2 in 1 mol·L−1 KOH, with favorable kinetics, evidenced by a reduced Tafel slope of 104.10 mV·dec−1, enhanced charge transfer with a charge transfer resistance of 4.56 Ω, and a double-layer capacitance of 34.73 mF·cm−2. Under an applied voltage of 0.90 V, the CoMo/SS cathode exhibited a hydrogen production rate of 1.12 m3·m−3·d−1, representing a 33.33% improvement over bare SS mesh. This performance highlights the catalyst’s potential as a viable Pt/C substitute for scalable MEC applications.