期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 10, 期 38, 页码 20616-20625出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2ta04155c
关键词
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资金
- Science and Engineering Research Board (SERB) [CRG/2018/004478]
- DST [DST/INSPIRE/03/2017/000005]
- IIT Ropar
- CSIR [09/1005(0029)/2020-EMR-1]
- HRI Allahabad
- DST-SERB [SRG/2020/001707]
- Swedish Research Council [VR-2016-06014, VR-2020-04410]
- INSPIRE PhD Fellowship
By modifying metallic silver with inorganic phosphate, Ag3PO4 was obtained as an effective electrocatalyst for e-NRR, showing superior activity and stability by suppressing HER and fine-tuning morphology.
Development of a highly active catalyst for the synthesis of ammonia via the electrochemical dinitrogen reduction reaction (e-NRR) is an immense challenge. We report the modification of metallic Ag with inorganic phosphate to obtain Ag3PO4 as an effective electrocatalyst for the e-NRR in alkaline media under ambient conditions. The designed Ag3PO4 catalyst can effectually suppress the HER. The e-NRR activity was improved by fine-tuning the morphology by a template free one-pot synthesis. The synthesised Ag3PO4 having cuboidal morphology is shown to have superior activity and stability towards the e-NRR witnessed from a high faradaic efficiency of 26.67%, yield rate of 456.75 mu g h(-1) mg(cat)(-1) and TOF value of 0.46 h(-1) at a positive potential of 0 V vs. RHE in 0.1 M KOH. Careful examination of any N-contaminants present in catalyst/electrolyte/gas-feed is carried out by UV-vis spectroscopy and gas-purification methods prior to e-NRR measurements to eliminate any false NH3 production. Also, the true source of NH3 production is confirmed by means of N-15-isotope labelling experiments via(1)H-NMR spectroscopy.
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