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Nickel Hydroxide Catalyzed Bias-free Photoelectrochemical NH<sub>3</sub> Production via Nitrate Reduction.

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.

SUBMITTER: Jin W 

PROVIDER: S-EPMC12464643 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature

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Nickel Hydroxide Catalyzed Bias-free Photoelectrochemical NH&lt;sub&gt;3&lt;/sub&gt; Production via Nitrate Reduction.

Jin Wonjoo W   Go Hyunju H   Jeong Juyeon J   Park Jeonghwan J   Tayyebi Ahmad A   Yu Je Min JM   Kim Seungchul S   Choi Keunsu K   Jang Ji-Wook JW   Seo Kwanyong K  

Advanced materials (Deerfield Beach, Fla.) 20250622 38

The photoelectrochemical nitrate reduction reaction (PEC NO<sub>3</sub>RR) potentially converts nitrate, a major water pollutant, into NH<sub>3</sub>, which is an eco-friendly, next-generation energy source. However, achieving high efficiency in the PEC NO<sub>3</sub>RR has been challenging because of the need for high applied voltage and competition with the hydrogen evolution reaction (HER). In this study, a PEC NO<sub>3</sub>RR is successfully implemented that demonstrated a high NH<sub>3</su  ...[more]

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