Trimetallic NiFeCr-LDH/MoS2composites as novel electrocatalyst for OER

Chen, Shuang; Yu, Chao; Cao, Zhanfang; Huang, Xiaoping; Wang, Shuai; Zhong, Hong

doi:10.1016/j.ijhydene.2020.11.249

Cited by 66 publications

(24 citation statements)

References 58 publications

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“…The binding energy of Cr 2p peak at 576.4 eV denoted the creation of Cr–O bond 70 . Similarly, the core-level Cr 2p XPS spectrum of MgCr-LDH/NP, could be fitted into two spin–orbit doublets, which corresponded to the peaks of Cr 2p 1/2 and Cr 2p 3/2 for the presence of Cr 3+ cation 74 . The binding energy of Cr 2p at 577.2 and 586.5 eV was accredited to the Cr 2p 3/2 and Cr 2p 1/2 states, which verified the trivalent nature of Cr ions.…”

Section: Resultsmentioning

confidence: 97%

“…Apart this, the development of green and cost-effective photocatalytic system in terms of substrate-free particulate 3D binary MgCr-LDH/NP via combination of simplistic hydrothermal technique followed by visible light illumination could be regarded as a novel approach towards sustainable energy utilization 72 . This type of 3D binary MgCr-LDH/NP assimilated by 2D nanosheets assured advantages without complex pre/post-treatments together with an effective amalgamation of pre-existing active sites of Cr(OH) 3 and oxygen vacancy related defect sites for effective electronic transportation resulting magnificent PEC properties towards photoinduced water splitting reactions 73 , 74 . This resourceful practice certifies single-step synthesis of colloidal MgCr-LDH/NS and thanks to the oxygen vacancies on the MgCr-LDH/NS which mostly provided active sites for further nucleation and crystallization process.…”

Section: Resultsmentioning

confidence: 99%

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Superlative photoelectrochemical properties of 3D MgCr-LDH nanoparticles influencing towards photoinduced water splitting reactions

Nayak

Parida

2022

Sci Rep

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In the present work, we report the synthesis of single system three-dimensional (3D) open porous structure of MgCr-LDH nanoparticles in a substrate-free path by using one-step formamide assisted hydrothermal reaction followed by visible light irradiation for significant photoelectrochemical (PEC) properties that manifest towards photocatalytic H2 and O2 production. The as-prepared nanostructured materials were characterized by various physico-chemical characterization techniques. Moreover, this unique synthetic approach produces 3D open porous network structure of MgCr-LDH nanoparticles, which were formed by stacking of numerous 2D nanosheets, for effective light harvestation, easy electronic channelization and unveil superlative PEC properties, including high current density (6.9 mA/cm2), small Tafel slope of 82 mV/decade, smallest arc of the Nyquist plot (59.1 Ω cm−2) and photostability of 6000 s for boosting water splitting activity. In addition, such perfectly self-stacked 2D nanosheets in 3D MgCr-LDH possess more surface active defect sites as enriched 50% oxygen vacancy resulting a good contact surface within the structure for effective light absorption along with easy electron and hole separation, which facilitates the adsorption of protons and intermediate for water oxidation. Additionally, the Cr3+ as dopant pull up the electrons from water oxidation intermediates, thereby displaying superior photocatalytic H2 and O2 production activity of 1315 μmol/h and 579 μmol/h, respectively. Therefore, the open 3D morphological aspects of MgCr-LDH nanoparticles with porous network structure and high surface area possess more surface defect sites for electron channelization and identified as distinct novel features of this kind of materials for triggering significant PEC properties, along with robustly enhance the photocatalytic water splitting performances.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Superlative photoelectrochemical properties of 3D MgCr-LDH nanoparticles influencing towards photoinduced water splitting reactions

Nayak

Parida

2022

Sci Rep

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“…The catalyst also demonstrated a low OER overpotential of 197 mV (η 10 ) and high stability over 200 hours at a current density of 125 mA cm − 2 (Figure 2(d‐f)). However, akin to other researchers, [42,46,59] the authors too suspect the inactivity of the Cr d‐band, and the C p‐band has been ascertained as the catalytically active centre for the OER. The enhanced OER may also be asserted to the synergistic effect of the N‐doping and the Cr 6+ ions in the graphene.…”

Section: Chromium Electrocatalysts For Oer In Alkaline Mediummentioning

confidence: 78%

“…[108,109] Chen et al proved that by combining NiFeCr LDH with MoS 2 , both of which are known to be active OER catalysts. [59] Upon introduction of NiFeCr LDH as a substrate for the MoS 2 , the NiFeCrLDH/MoS 2 composite (1.50 V vs RHE at 10 mA cm À 2 , 85 mV dec À 1 ) exhibited better OER activity in terms of onset potential and Tafel slopes than the respective parent materials (NiFeCr-LDH; (1.58 V vs RHE at 10 mA cm À 2 , 116 mV dec À 1 and NiFe-LDH; 1.61 V vs RHE at 10 mA cm À 2 , 143 mV dec À 1 ). EIS measurement also point to enhanced charge transfer in the following order: NiFe-LDH (32 Ω) < NiFeCr-LDH (26 Ω) < NiFeCr-LDH@MoS 2 (17 Ω).…”

Section: Cr-based Nitrides Phosphides and Chalcogenides (S Se Or Te)mentioning

confidence: 99%

Recent Developments on Cr‐Based Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Media

Babu

Falch

2022

ChemCatChem

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Among a plethora of transition-metal catalysts explored for the oxygen evolution reaction (OER) in water electrolysis, the use of chromium (Cr) as a component, has only recently started to gain momentum. In this review, recent investigations where Cr has been utilised for alkaline OER has been summarised and evaluated. The Cr-based electrocatalysts have been categorised and discussed according to their anion counterparts. From the majority of reviewed studies, Cr comes across as a beneficial co-catalyst owing to its ability to act as either an electron acceptor or electron donor. This characteristic property stems from the many possible oxidation states of Cr, with Cr 3 + and Cr 6 + being the most pronounced states. This review emphasises on providing a holistic view of the role Cr plays in OER electrocatalysis, focussing mainly on the correlations of activity, structure, and electronic configuration.

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“…The following supporting information can be downloaded at: [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 ].…”

mentioning

confidence: 99%

FeNi LDH/V2CTx/NF as Self-Supported Bifunctional Electrocatalyst for Highly Effective Overall Water Splitting

Yang

Chen

et al. 2022

Nanomaterials

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The development of bifunctional electrocatalysts with efficient oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is still a key challenge at the current stage. Herein, FeNi LDH/V2CTx/nickel foam (NF) self-supported bifunctional electrode was prepared via deposition of FeNi LDH on V2CTx/NF substrate by hydrothermal method. Strong interfacial interaction between V2CTx/NF and FeNi LDH effectively prevented the aggregation of FeNi LDH, thus exposing more catalytic active sites, which improved electrical conductivity of the nanohybrids and structural stability. The results indicated that the prepared FeNi LDH/V2CTx/NF required 222 mV and 151 mV overpotential for OER and HER in 1 M KOH to provide 10 mA cm−2, respectively. Besides, the FeNi LDH/V2CTx/NF electrocatalysts were applied to overall water splitting, which achieved a current density of 10 mA cm−2 at 1.74 V. This work provides ideas for improving the electrocatalytic performance of electrocatalysts through simple synthesis strategies, structural adjustment, use of conductive substrates and formation of hierarchical structures.

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Trimetallic NiFeCr-LDH/MoS2composites as novel electrocatalyst for OER

Cited by 66 publications

References 58 publications

Superlative photoelectrochemical properties of 3D MgCr-LDH nanoparticles influencing towards photoinduced water splitting reactions

Superlative photoelectrochemical properties of 3D MgCr-LDH nanoparticles influencing towards photoinduced water splitting reactions

Recent Developments on Cr‐Based Electrocatalysts for the Oxygen Evolution Reaction in Alkaline Media

FeNi LDH/V2CTx/NF as Self-Supported Bifunctional Electrocatalyst for Highly Effective Overall Water Splitting

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