Ultrathin Prussian blue analogue nanosheet arrays with open bimetal centers for efficient overall water splitting

Chen, Ziliang; Fei, Ben; Hou, Meiling; Yan, Xiaoxiao; Chen, Mao; Qing, Huilin; Wu, Renbing

doi:10.1016/j.nanoen.2019.104371

Cited by 135 publications

(105 citation statements)

References 64 publications

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“…In region f, the lattice spacing is determined to be 0.51 nm, which is attributed to the (200) face of Ni‐Fe PBA (Figure S12, Supporting Information). [ 22 ] The corresponding fast Fourier transform (FFT) pattern presents distinct bright spots with a cubically arranged shape (the inset of Figure 1f), suggesting the formation of pure Ni–Fe phase and being consistent with the XRD results. [ 22 ] Simultaneously, the well‐resolved lattice fringes with a spacing of 0.23 nm can be indexed to the (101) planes of Ni(OH) 2 in the region g (Figure S13, Supporting Information).…”

Section: Figuresupporting

confidence: 77%

Self‐Anti‐Stacking 2D Metal Phosphide Loop‐Sheet Heterostructures by Edge‐Topological Regulation for Highly Efficient Water Oxidation

Quan

Lai

Bao

et al. 2021

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2D metal phosphide loop‐sheet heterostructures are controllably synthesized by edge‐topological regulation, where Ni2P nanosheets are edge‐confined by the N‐doped carbon loop, containing ultrafine NiFeP nanocrystals (denoted as NiFeP@NC/Ni2P). This loop‐sheet feature with lifted‐edges prevents the stacking of nanosheets and induces accessible open channels for catalytic site exposure and gas bubble release. Importantly, these NiFeP@NC/Ni2P hybrids exhibit a remarkable oxygen evolution activity with an overpotential of 223 mV at 20 mA cm−2 and a Tafel slope of 46.1 mV dec−1, constituting the record‐high performance among reported metal phosphide electrocatalysts. The NiFeP@NC/Ni2P hybrids are also employed as both anode and cathode to achieve an alkaline electrolyzer for overall water splitting, delivering a current density of 10 mA cm−2 with a voltage of 1.57 V, comparable to that of the commercial Pt/C||RuO2 couple (1.56 V). Moreover, a photovoltaic–electrolysis coupling system can as well be effectively established for robust overall water splitting. Evidently, this ingenious protocol would expand the toolbox for designing efficient 2D nanomaterials for practical applications.

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Section: Figuresupporting

confidence: 77%

Self‐Anti‐Stacking 2D Metal Phosphide Loop‐Sheet Heterostructures by Edge‐Topological Regulation for Highly Efficient Water Oxidation

Quan

Lai

Bao

et al. 2021

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“…MOLs and MOFs have been widely investigated in a variety of electrocatalysis studies such as the hydrogen evolution reaction (HER), 5 , 88 , 89 , 91 − 95 oxygen evolution reaction (OER), 32 , 54 , 57 , 87 , 96 − 99 overall water splitting, 33 , 100 oxygen reduction reaction (ORR), 101 − 104 carbon dioxide reduction (CO 2 RR), 35 , 105 − 107 and electrocatalytic transformation of organic molecules. 34 , 108 Some reported MOLs show comparable or even better performance than benchmark noble metal-based catalysts.…”

Section: Facilitating Electron Transfer Of Mols For Electrocatalysismentioning

confidence: 99%

Metal–Organic Layers for Electrocatalysis and Photocatalysis

Cao

Wang

2020

ACS Cent. Sci.

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Metal–organic layers (MOLs) are two-dimensional analogues of metal–organic frameworks (MOFs) with a high aspect ratio and thickness down to a monolayer. Active sites on MOLs are more accessible than those on MOFs thanks to the two-dimensional feature of MOLs, which allows easier chemical modification around the catalytic center. MOLs can also be assembled with other functional materials through surface anchoring sites that can facilitate charge/energy transport through the hybrid material. MOLs are thus quite suitable for interfacial catalysis like electrocatalysis and photocatalysis. In this outlook, we focus on representative progress of constructing unique interfacial sites on MOLs with designer paths for charge separation and energy transfer, as well as cooperative cavities for superior substrate adsorption and activation. We also discuss challenges and potentials in the future development of MOL catalysts and catalysts beyond MOLs.

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“…[15][16][17][18] At present, noble Pt metal and Ir/Ru-based oxides are the benchmark electrocatalysts to speed up the HER and the OER, respectively. [19][20][21][22][23] Unfortunately, the tremella-like Ni 3 S 2 /MnS-O with abundant oxygen vacancies, which was favorable for HER and OER. [37] An in situ formation of {111} faceted Ni 3 S 2 on the surface of nickel foam toward HER and OER via a one-step hydrothermal process in a Na 2 S aqueous solution was also demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Ultrathinning Nickel Sulfide with Modulated Electron Density for Efficient Water Splitting

Fei

Chen

Liu

et al. 2020

Advanced Energy Materials

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Developing nonprecious electrocatalysts via a cost‐effective methods to synergistically achieve high active sites exposure and optimized intrinsic activity remains a grand challenge. Here a low‐cost and scaled‐up chemical etching method is developed for transforming nickel foam (NF) into a highly active electrocatalyst for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). The synthetic method involves a Na2S‐induced chemical etching of NF in the presence of Fe, leading to a growth of ultrathin Fe‐doped Ni3S2 arrays on the NF substrate (FexNi3‐xS2 @ NF). The combined experimental and theoretical investigations reveal that the incorporated Fe cations significantly modulate the morphology and the surface electron density of Ni3S2, and thus significantly boost the electrochemically active surface area, electron transfer, and optimize the hydrogen/water absorption free energy. The developed Fe0.9Ni2.1S2 @ NF requires overpotentials of only 72 mV at 10 mA cm−2 for HER and 252 mV at 100 mA cm−2 for OER in 1.0 m KOH, respectively, enabling an alkaline electrolyzer at a low cell voltage of 1.51 V to drive 10 mA cm−2 for overall water splitting. More broadly, this synthetic approach is very versatile and can be used to synthesize other ultrathin metal sulfides (e.g., Fe–Cu–S, Fe–Al–S, and Fe–Ti–S).

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Ultrathin Prussian blue analogue nanosheet arrays with open bimetal centers for efficient overall water splitting

Cited by 135 publications

References 64 publications

Self‐Anti‐Stacking 2D Metal Phosphide Loop‐Sheet Heterostructures by Edge‐Topological Regulation for Highly Efficient Water Oxidation

Self‐Anti‐Stacking 2D Metal Phosphide Loop‐Sheet Heterostructures by Edge‐Topological Regulation for Highly Efficient Water Oxidation

Metal–Organic Layers for Electrocatalysis and Photocatalysis

Ultrathinning Nickel Sulfide with Modulated Electron Density for Efficient Water Splitting

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