Nickel Hydroxide Catalyzed Bias‐free Photoelectrochemical NH3 Production via Nitrate Reduction

IF 27.4 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Advanced Materials Pub Date : 2025-06-23 DOI:10.1002/adma.202506567

Wonjoo Jin, Hyunju Go, Juyeon Jeong, Jeonghwan Park, Ahmad Tayyebi, Je Min Yu, Seungchul Kim, Keunsu Choi, Ji‐Wook Jang, Kwanyong Seo

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Abstract

The photoelectrochemical nitrate reduction reaction (PEC NO3RR) potentially converts nitrate, a major water pollutant, into NH3, which is an eco‐friendly, next‐generation energy source. However, achieving high efficiency in the PEC NO3RR has been challenging because of the need for high applied voltage and competition with the hydrogen evolution reaction (HER). In this study, a PEC NO3RR is successfully implemented that demonstrated a high NH3 production rate of 2468 µg cm−2 h−1 (at −0.1 V vs RHE) using a c‐Si photocathode with Ni foil as the catalyst. Conducting the PEC NO3RR under alkaline conditions can lead to the self‐activation of the Ni surface with Ni(OH)2. Ni(OH)2 can suppress the competitive HER and facilitate NO3RR, enhancing NH3 production efficiency. Furthermore, a PEC NO3RR system is developed that operates without external voltage and achieved bias‐free record‐high solar to NH3 conversion efficiency of 3.8% and an NH3 production rate of 554 µg cm−2 h−1.

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硝酸还原氧化镍催化无偏置光电化学NH3生产

光电化学硝酸还原反应（PEC NO3RR）有可能将硝酸盐（一种主要的水污染物）转化为NH3，这是一种环保的下一代能源。然而，由于需要高施加电压和与析氢反应（HER）的竞争，在PEC NO3RR中实现高效率一直具有挑战性。在这项研究中，PEC NO3RR成功实现了2468µg cm−2 h−1（在−0.1 V vs RHE下）的高NH3产率，使用镍箔作为催化剂的c - Si光电阴极。在碱性条件下进行PEC NO3RR可以导致Ni(OH)2在Ni表面的自活化。Ni(OH)2可以抑制竞争性HER，促进NO3RR，提高NH3的生产效率。此外，开发了PEC NO3RR系统，该系统在没有外部电压的情况下工作，实现了无偏置的太阳能到NH3的转换效率为3.8%，NH3的产出率为554µg cm−2 h−1。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advanced Materials 工程技术-材料科学：综合

CiteScore

43.00

自引率

4.10%

发文量

2182

审稿时长

2 months

期刊介绍： Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.