Electroreduction of nitrogen to ammonia on gas-diffusion electrodes modified by metal phthalocyanines

Furuya, Nagakazu; Yoshiba, Hiroshi

doi:10.1016/0022-0728(89)87086-x

Cited by 39 publications

(24 citation statements)

References 3 publications

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“…67 The lower the overpotential is, the higher is the activity of the catalyst for the investigated reaction. [69][70][71] organic solvents mediated by LiClO 4 (ref. 12(b) shows a zoom in for the potential range of 0.0 to À0.3 V vs. NHE to determine the overpotentials for Rh and Ru for the electrochemical NH 3 synthesis.…”

Section: Linear Sweep Voltammetry Measurements Of Rh and Rumentioning

confidence: 99%

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis

Kugler

Luhn

Schramm

et al. 2015

Phys. Chem. Chem. Phys.

138

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Nowadays NH3 is exclusively synthesized by the Haber process. Unfortunately, the energy demand and the CO2 emissions due to H2 production are high. Hydrogen production utilizes precious carbon sources such as coal and natural gas. In the past we proposed an alternative process concept using a membrane electrode assembly in an electrochemical membrane reactor (ecMR). At the anode H2O is oxidized at an IrMMO catalyst to form protons. By applying an external potential to the ecMR N2 is reduced to NH3 at the cathode. Just recently Rh and Ru were identified as possible cathodic electrocatalysts by DFT calculations. We present an easy and highly efficient method for galvanic coatings of Rh and Ru on randomly structured Ti felts to be used in a membrane electrode assembly. Linear sweep voltammetry measurements give a slightly higher activity of Ru for the liquid phase electrochemical NH3 synthesis. The NH4(+) concentration reached is 8 times higher for Ru than for Rh. From an economical point of view, Ru is also more feasible for an electrochemical NH3 synthesis process. Such electrodes can now be evaluated in an ecMR in comparison to recently demonstrated Ti-based electrodes.

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Section: Linear Sweep Voltammetry Measurements Of Rh and Rumentioning

confidence: 99%

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis

Kugler

Luhn

Schramm

et al. 2015

Phys. Chem. Chem. Phys.

138

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“…In 1985, for the first time, Pickett et al reported the electrochemical synthesis of ammonia at room temperature through protolysis of cis-[W(N 2 ) 2 (PMe 2 Ph) 4 ]16. There were reports on electrochemical synthesis of ammonia from N 2 and H 2 using Na 2 SO 4 aqueous solution as the electrolyte but the current was quite small1718. This could be related to the low proton conductivity of Na 2 SO 4 solution.…”

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confidence: 99%

Synthesis of ammonia directly from air and water at ambient temperature and pressure

Lan

Irvine

Tao

2013

Sci Rep

366

276

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The N≡N bond (225 kcal mol−1) in dinitrogen is one of the strongest bonds in chemistry therefore artificial synthesis of ammonia under mild conditions is a significant challenge. Based on current knowledge, only bacteria and some plants can synthesise ammonia from air and water at ambient temperature and pressure. Here, for the first time, we report artificial ammonia synthesis bypassing N2 separation and H2 production stages. A maximum ammonia production rate of 1.14 × 10−5 mol m−2 s−1 has been achieved when a voltage of 1.6 V was applied. Potentially this can provide an alternative route for the mass production of the basic chemical ammonia under mild conditions. Considering climate change and the depletion of fossil fuels used for synthesis of ammonia by conventional methods, this is a renewable and sustainable chemical synthesis process for future.

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“…The reduction of nitrogen to ammonia with initial current efficiencies of ca. 1% at -0.6 V vs. RHE was reported for various metal phthalocyanines [47]. However, the current efficiency decreased rapidly with time.…”

Section: As Electrocatalystsmentioning

confidence: 89%

Electroanalysis with electrodes modified by inorganic films

1991

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Electroreduction of nitrogen to ammonia on gas-diffusion electrodes modified by metal phthalocyanines

Cited by 39 publications

References 3 publications

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis

Synthesis of ammonia directly from air and water at ambient temperature and pressure

Electroanalysis with electrodes modified by inorganic films

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Electroreduction of nitrogen to ammonia on gas-diffusion electrodes modified by metal phthalocyanines

Cited by 39 publications

References 3 publications

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH3synthesis

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH3synthesis

Synthesis of ammonia directly from air and water at ambient temperature and pressure

Electroanalysis with electrodes modified by inorganic films

Contact Info

Product

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About

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis

Galvanic deposition of Rh and Ru on randomly structured Ti felts for the electrochemical NH₃synthesis