Details

Autor(en) / Beteiligte

• Jiang, Haifeng
• Chen, Gao‐Feng
• Savateev, Oleksandr
• Xue, Jian
• Ding, Liang‐Xin
• Liang, Zhenxing
• Antonietti, Markus
• Wang, Haihui

Titel

Enabled Efficient Ammonia Synthesis and Energy Supply in a Zinc–Nitrate Battery System by Separating Nitrate Reduction Process into Two Stages

Ist Teil von

• Angewandte Chemie International Edition, 2023-03, Vol.62 (13), p.e202218717-n/a

Auflage

International ed. in English

Ort / Verlag

Germany: Wiley Subscription Services, Inc

Erscheinungsjahr

2023

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The aqueous electrocatalytic reduction of NO3− into NH3 (NitrRR) presents a sustainable route applicable to NH3 production and potentially energy storage. However, the NitrRR involves a directly eight‐electron transfer process generally required a large overpotential (<−0.2 V versus reversible hydrogen electrode (vs. RHE)) to reach optimal efficiency. Here, inspired by biological nitrate respiration, the NitrRR was separated into two stages along a [2+6]‐electron pathway to alleviate the kinetic barrier. The system employed a Cu nanowire catalyst produces NO2− and NH3 with current efficiencies of 91.5 % and 100 %, respectively at lower overpotentials (>+0.1 vs. RHE). The high efficiency for such a reduction process was further explored in a zinc‐nitrate battery. This battery could be specified by a high output voltage of 0.70 V, an average energy density of 566.7 Wh L−1 at 10 mA cm−2 and a power density of 14.1 mW cm−2, which is well beyond all previously reported similar concepts. For the efficient electrocatalytic conversion of NO3− to NH3, a two‐stage process following the [2+6]‐electron pathway is proposed inspired by biological nitrate respiration. This system produces NO2− and NH3 at low overpotentials (>+0.1 vs. RHE), resulting in a low energy consumption of 17.7 kWh kg−1 for NH3 production and high energy density of 566.7 Wh L−1 at 10 mA cm−2 for Zn−NO3− battery.