Enhanced photoelectrochemical performance of ZnO/NiFe-layered double hydroxide for water splitting: Experimental and photo-assisted density functional theory calculations

Yu, Jie; Liu, Zhisong; Ye, Feng; Bao, Wentao; Peng, Banghua; Wang, Gang; Zhang, Li Li; Xu, Yisheng; Wang, Fu

doi:10.1016/j.jcis.2022.05.001

“…In situ Raman tests confirmed the improvement in the internal structure of the catalyst under illumination (Figure 8b,c). Combined with theoretical calculations, the electron transfer process and the intermediate adsorption were optimized, further revealing the origin of photo-enhanced activity (Figure 8f) [101]. In addition to noble metals and non-precious metals, the photogenerated carrier-assisted strategy can also be extended to metal-free dual-functional electrocatalysts.…”

Section: Photogenerated Carrier-assisted Electrocatalysts For Overall...mentioning

confidence: 95%

Photogenerated Carrier-Assisted Electrocatalysts for Efficient Water Splitting

Li

¹

,

Zheng

²

,

Zhen

³

et al. 2023

Catalysts

6

0

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Electrocatalysts are the core component of electrocatalytic water splitting for improving its overall energy conversion efficiency and reducing the energy input. At present, the design of efficient electrocatalysts mainly focuses on optimizing their electronic structure and local reaction microenvironment to improve the adsorption of reaction intermediates. Although many effective strategies (such as heteroatom doping, vacancy, heterojunction construction, strain engineering, and phase transformation) have been developed, the improvement in catalytic activity has been very limited. Hence, the development of innovative strategies to enhance the optimization of photoelectroactivity is desirable. Inspired by the strategy of applying a potential field to reduce carrier radiation recombination in traditional photoelectrocatalysis, photogenerated carrier-assisted electrocatalysis, based on the synergy effect of light and electric energy, provides a new strategy to enhance the intrinsic activity of water splitting. The essence of the photo-assisted strategy can be attributed to the injection of hot carriers and photogenerated electron–hole pairs or the accelerated reaction kinetics caused by local temperature rises. The photogenerated carrier-assisted strategy has received wide attention due to its simplicity and efficiency. In this review, we focus on the recent advances in photogenerated carrier-assisted strategies (PCAS) for enhancing the performance of HER, OER, and overall water splitting. The possible mechanisms are addressed and the basic composition and latest progress in photo-assisted electrocatalysts using PCAS are summarized. Finally, the challenges and development prospects of PCAS will be detailed.

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High‐Efficiency Photo‐Assisted Large Current‐Density Water Splitting with Mott‐Schottky Heterojunctions

Jiang,

Xu,

Chen

et al. 2024

Angewandte Chemie

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The development of bifunctional photogenerated carrier‐assisted electrocatalytic (PCA‐EC) electrodes that operate with stability at large current‐density remains a significant challenge. Herein, we demonstrate a simple sputtering‐deposition process to synthesize a novel MnWO4/FeCoNi Mott‐Schottky heterojunction coating and deposit it on a pure Ti substrate to prepare high‐performance PCA‐EC electrodes, which exhibits enhanced light absorption range/intensity and rapidly separated photogenerated electron‐hole pairs. This design allows photogenerated electrons to directly participate in the hydrogen evolution reaction (HER), while the strong oxidation of photogenerated holes significantly reduces the defect formation energy of active metals, thereby facilitating the rapid reconstruction of highly active Ni(FeCo)OOH/MnOOH species for the oxygen evolution reaction (OER). As expected, the as‐prepared electrode demonstrates the overpotentials of 64 mV for the HER and 204 mV for the OER at 10 mA cm−2 under illumination. Benefiting from the stable interface with Fe/Co/Ni‐O‐Mn/W bonding units, the dual‐electrode photoassisted electrolytic cell achieves long‐term stability at current densities of 500 and 1000 mA cm−2. This work provides detailed insights into the enhancement mechanism of PCA‐EC and contributes to the development of photo‐assisted water splitting electrodes for large current‐density applications.

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High‐Efficiency Photo‐Assisted Large Current‐Density Water Splitting with Mott‐Schottky Heterojunctions

Jiang,

Xu,

Chen

et al. 2024

Angew Chem Int Ed

0

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The development of bifunctional photogenerated carrier‐assisted electrocatalytic (PCA‐EC) electrodes that operate with stability at large current‐density remains a significant challenge. Herein, we demonstrate a simple sputtering‐deposition process to synthesize a novel MnWO4/FeCoNi Mott‐Schottky heterojunction coating and deposit it on a pure Ti substrate to prepare high‐performance PCA‐EC electrodes, which exhibits enhanced light absorption range/intensity and rapidly separated photogenerated electron‐hole pairs. This design allows photogenerated electrons to directly participate in the hydrogen evolution reaction (HER), while the strong oxidation of photogenerated holes significantly reduces the defect formation energy of active metals, thereby facilitating the rapid reconstruction of highly active Ni(FeCo)OOH/MnOOH species for the oxygen evolution reaction (OER). As expected, the as‐prepared electrode demonstrates the overpotentials of 64 mV for the HER and 204 mV for the OER at 10 mA cm−2 under illumination. Benefiting from the stable interface with Fe/Co/Ni‐O‐Mn/W bonding units, the dual‐electrode photoassisted electrolytic cell achieves long‐term stability at current densities of 500 and 1000 mA cm−2. This work provides detailed insights into the enhancement mechanism of PCA‐EC and contributes to the development of photo‐assisted water splitting electrodes for large current‐density applications.

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Enhanced photoelectrochemical performance of ZnO/NiFe-layered double hydroxide for water splitting: Experimental and photo-assisted density functional theory calculations

Cited by 21 publications

References 40 publications

Photogenerated Carrier-Assisted Electrocatalysts for Efficient Water Splitting

Photogenerated Carrier-Assisted Electrocatalysts for Efficient Water Splitting

High‐Efficiency Photo‐Assisted Large Current‐Density Water Splitting with Mott‐Schottky Heterojunctions

High‐Efficiency Photo‐Assisted Large Current‐Density Water Splitting with Mott‐Schottky Heterojunctions

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