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<p>Electrochemical reduction of nitrate&#xa0;to ammonia&#xa0;represents a promising sustainable alternative for ammonia&#xa0;production, a critical component of the nitrogen cycle and&#xa0;a linchpin in the&#xa0;chemical industry. This approach not only offers the potential for improved energy efficiency compared to conventional processing but also utilizes nitrate, which is commonly found in agricultural runoff and industrial waste products, as the starting material. This study explores epitaxial TiN&#xa0;thin films on Si(111) substrates as both catalyst and support for electrocatalytic nitrate reduction. The use of TiN is motivated by its excellent electrical conductivity, earth-abundance, and stability. We observed a more than threefold increase in nitrate reduction current density in Pt catalyst deposited onto TiN thin film support&#xa0;as compared to Si substrate support; TiN films also exhibit catalytic activity for nitrate reduction even in the absence of other catalyst materials.&#xa0;Transition metal nitrides hold promise for electrocatalytic ammonia synthesis.</p> Graphical abstract <p></p>

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Electrocatalytic activity of epitaxial titanium nitride thin films for nitrate reduction to ammonia

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Indeewari M. Karunarathne,
  • Dilan M. Gamachchi,
  • Xiaoman Zhang,
  • Wangwang Xu,
  • W. J. Meng,
  • Andrew C. Meng

摘要

Electrochemical reduction of nitrate to ammonia represents a promising sustainable alternative for ammonia production, a critical component of the nitrogen cycle and a linchpin in the chemical industry. This approach not only offers the potential for improved energy efficiency compared to conventional processing but also utilizes nitrate, which is commonly found in agricultural runoff and industrial waste products, as the starting material. This study explores epitaxial TiN thin films on Si(111) substrates as both catalyst and support for electrocatalytic nitrate reduction. The use of TiN is motivated by its excellent electrical conductivity, earth-abundance, and stability. We observed a more than threefold increase in nitrate reduction current density in Pt catalyst deposited onto TiN thin film support as compared to Si substrate support; TiN films also exhibit catalytic activity for nitrate reduction even in the absence of other catalyst materials. Transition metal nitrides hold promise for electrocatalytic ammonia synthesis.

Graphical abstract