Zn-Co layered double hydroxide modified hematite photoanode for enhanced photoelectrochemical water splitting

Xu, Da; Rui, Yichuan; Li, Yaogang; Zhang, Qinghong; Wang, Hongzhi

doi:10.1016/j.apsusc.2015.08.160

Cited by 56 publications

(23 citation statements)

References 53 publications

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“…These diffracted peaks are in accordance with the standard data file JCPDS no. 21-1477 [11]. Along with these diffraction peaks, the peaks located at 44.55°, 51.91°, and 76.47° were caused by the substrate Ni foam.…”

Section: Resultsmentioning

confidence: 90%

Zinc Cobalt Layered Double Hydroxide Electrode for High-Performance Supercapacitor

Pawar

et al. 2019

ASCT

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We aim to fabricate a ZnCo layered double hydroxide (LDH) nanostructure through facile one-pot hydrothermal synthesis. ZnCo LDH with interconnected hexagonal sheets having ultrathin thickness with voids are synthesized for the effective penetration of electrolytes to achieve superior electrochemical properties. The as-synthesized ZnCo LDH nanostructure is then subjected to structural, morphological, phase, and electrochemical studies. As an electrode for a supercapacitor, the ZnCo LDH has an areal capacitance of 1964 mFcm-2 at a 5 mVs-1 scan rate, an energy density of 0.22 mWhcm-2 , and an excellent cycling stability (112 %) after 2000 charge discharge cycles.

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Section: Resultsmentioning

confidence: 90%

Zinc Cobalt Layered Double Hydroxide Electrode for High-Performance Supercapacitor

Pawar

et al. 2019

ASCT

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“…25 Indeed, our Zn-doped electrodes show superior performance to all published Fe-based OER catalysts in alkaline media as conrmed by current density data and turnover frequency (Table S9 †). 14,[61][62][63][64][65] The combination of experimental and theoretical investigations on the electrocatalytic performance, active surface area and morphology indicates that the improved OER catalytic properties of Zn-doped hematite should be linked to an alternative mechanistic pathway, including a thermodynamically favoured PCET process. The direct participation of the non-redox Zn centres as active sites during the O-O bond formation allows a higher top volcano to be reached for oxides that could not be achieved without it.…”

Section: Discussionmentioning

confidence: 99%

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

et al. 2020

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“…This enhanced performance is attributed to the improved charge separation with the ion-permeable Ni(OH) 2 catalyst film. In the literature, other metal oxides, e.g., MnOx [38], metal layered double (oxy)hydroxides [39,40] or sulfides [41] have been used as co-catalysts for hematite photoanodes to promote PEC performances for water splitting. For instance, electrodeposited FeNiOOH modified hematite resulted in a 190 mV cathodic shift in the Vonset as well as a great increase in photocurrent density from 0.9 to 2.24 mA cm −2 [39].…”

Section: Earth Abundant Metal Based Co-catalystsmentioning

confidence: 99%

“…One recent approach to improve the performance of photoelectrodes is to take advantage of the low energy photons in the infrared (IR) range [43,45]. Some of these rare earth elements, e.g., lanthanum, erbium or ytterbium, have the capability to absorb light in the infrared region and to convert them into shorter wavelength In the literature, other metal oxides, e.g., MnO x [38], metal layered double (oxy)hydroxides [39,40] or sulfides [41] have been used as co-catalysts for hematite photoanodes to promote PEC performances for water splitting. For instance, electrodeposited FeNiOOH modified hematite resulted in a 190 mV cathodic shift in the V onset as well as a great increase in photocurrent density from 0.9 to 2.24 mA cm −2 [39].…”

Section: Rare Earth Element Decorationmentioning

confidence: 99%

Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

Lange

2018

Catalysts

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Solar water splitting is a promising method for producing renewable fuels. Thermodynamically, the overall water splitting reaction is an uphill reaction involving a multiple electron transfer process. The oxygen evolution reaction (OER) has been identified as the bottleneck process. Hematite (α-Fe2O3) is one of the best photoanode material candidates due to its band gap properties and stability in aqueous solution. However, the reported efficiencies of hematite are notoriously lower than the theoretically predicted value mainly due to poor charge transfer and separation ability, short hole diffusion length as well as slow water oxidation kinetics. In this Review Article, several emerging surface modification strategies to reduce the oxygen evolution overpotential and thus to enhance the water oxidation reaction kinetics will be presented. These strategies include co-catalysts loading, photoabsorption enhancing (surface plasmonic metal and rare earth metal decoration), surface passivation layer deposition, surface chemical etching and surface doping. These methods are found to reduce charge recombination happening at surface trapping states, promote charge separation and diffusion, and accelerate water oxidation kinetics. The detailed surface modification methods, surface layer materials, the photoelectrochemical (PEC) performances including photocurrent and onset potential shift as well as the related proposed mechanisms will be reviewed.

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Zn-Co layered double hydroxide modified hematite photoanode for enhanced photoelectrochemical water splitting

Cited by 56 publications

References 53 publications

Zinc Cobalt Layered Double Hydroxide Electrode for High-Performance Supercapacitor

Zinc Cobalt Layered Double Hydroxide Electrode for High-Performance Supercapacitor

Non-redox doping boosts oxygen evolution electrocatalysis on hematite

Surface Modification of Hematite Photoanodes for Improvement of Photoelectrochemical Performance

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