Engineering Doping and Vacancy in a C3N4 Electrocatalyst with Ni4Mo Cocatalyst for Efficient Alkaline Hydrogen Evolution
Hsin-An Lin, Sheng-Chang Wang, Jow-Lay Huang, Yu-Min Shen, Wen-Hui Sophia Cheng
TL;DR
This paper introduces a phosphorus-doped carbon nitride electrocatalyst with a Ni4Mo cocatalyst that efficiently produces hydrogen in alkaline conditions.
Contribution
The novel use of phosphorus doping and nitrogen vacancies in C3N4 with a Ni4Mo cocatalyst achieves high HER performance without noble metals.
Findings
Phosphorus doping improves electronic conductivity and creates active sites for hydrogen evolution.
The catalyst achieves a low overpotential of 93 mV at −10 mA·cm–2 and a Tafel slope of 88 mV·dec–1.
Nitrogen vacancies and Ni4Mo cocatalyst synergistically enhance catalytic activity.
Abstract
To meet the growing demand for sustainable hydrogen production, robust and cost-effective electrocatalysts are essential, especially under alkaline conditions. Herein, we report a phosphorus-doped carbon nitride (P–C3N4) electrocatalyst exhibiting remarkable hydrogen evolution reaction (HER) performance in an alkaline electrolyte. Phosphorus doping was found to promote electronic conductivity and create Lewis acidic active sites, facilitating water dissociation and hydrogen adsorption. Electrochemical measurements revealed a significant reduction in overpotential and Tafel slope upon optimal P-doping (2.0 at%). Further introduction of nitrogen vacancies (NV) and coloading with Ni4Mo bimetallic alloy synergistically enhanced the catalytic activity, delivering an overpotential (η10) as low as 93 mV at −10 mA·cm–2 and a Tafel slope of 88 mV·dec–1, without reliance on noble metals. These…
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Taxonomy
TopicsElectrocatalysts for Energy Conversion · Ammonia Synthesis and Nitrogen Reduction · Metalloenzymes and iron-sulfur proteins