Morphology‐Controlled Metal Sulfides and Phosphides for Electrochemical Water Splitting

Joo, Jinwhan; Kim, Taekyung; Lee, Jae-Young; Choi, Sang Il; Lee, Kwangyeol

doi:10.1002/adma.201806682

Cited by 556 publications

(333 citation statements)

References 133 publications

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“…Second, there has been raising concern of too high electronegativity of S, causing too strong interaction between S and H (highly negative Δ G H* ); and consequently, poor HER efficiency. [ 5,8 ] In this regard, structural engineering by doped metal with positively Gibbs free energy for proton adsorption (positive Δ G H* ) to facilitate adsorption/desorption processes might be an answer. Among all the candidates with weak hydrogen binding energy, Cu has stood out to be one of the best due to its low cost and high natural abundance.…”

Section: Introductionmentioning

confidence: 99%

Electronic Modulation of Nickel Disulfide toward Efficient Water Electrolysis

Dinh

Sun

Pei

et al. 2020

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friendly and sustainable sources of power are being looked at in order to meet the demand. Among all the developing technologies, solar-light-coupled electrochemical water splitting is widely perceived as one of the best solutions due to the generation of hydrogen -a sustainable and clean source of energy. [1] It is known that noble group compounds, namely Pt and RuO 2 /IrO 2 , are the state-of-the-art electrocatalysts toward two critical half-reactions of water splitting -hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). [2] However, the high price and natural shortage impede their further application. Therefore, developing lowcost, efficient electrocatalyst is urgently desired.Motivated by the challenge, a wide range of materials have been investigated and developed. [3] Among them, nickelbased materials have attracted a great deal of attention mainly because their eight valence electrons in 3d orbitals enable the easy alteration of electronic structure through phase engineering (laser-induced, mechanical strain, weak Ar plasma treatment, e-beam irradiation, and plasmonic hotelectron-induced), heterostructuring (NiS 2 -MoS 2 , Ni 3 S 2 -MoS 2 , V-Ni 2 P). [3c,4] A representative compound in this nickel-based family, pyrite-type nickel sulfides (NiS 2 ) is emerging as a highly Developing highly efficient earth-abundant nickel-based compounds is an important step to realize hydrogen generation from water. Herein, the electronic modulation of the semiconducting NiS 2 by cation doping for advanced water electrolysis is reported. Both theoretical calculations and temperaturedependent resistivity measurements indicate the semiconductor-to-conductor transition of NiS 2 after Cu incorporation. Further calculations also suggest the advantages of Cu dopant to cathodic water electrolysis by bringing Gibbs free energy of H adsorption at both Ni sites and S sites much closer to zero. It is noteworthy that water dissociation on Cu-doped NiS 2 (Cu-NiS 2 ) surface is even more favorable than those on NiS 2 and Pt(111). Thus, the prepared Cu-NiS 2 shows noticeably improved performance toward alkaline hydrogen and oxygen evolution reactions (HER and OER). Specifically, it requires merely 232 mV OER overpotential to drive 10 mA cm −2 ; in parallel with Tafel slopes of 46 mV dec −1 . Regarding HER, an onset overpotential of only 68 mV is achieved. When integrated as both electrodes for water electrolysis, Cu-NiS 2 needs only 1.64 V to drive 10 mA cm −2 , surpassing the state-of-the-art Ir/C-Pt/C couple (1.71 V). This work opens up an avenue to engineer low-cost and earth-abundant catalysts performing on par with the noble-metal-based one for water splitting.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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Section: Introductionmentioning

confidence: 99%

Electronic Modulation of Nickel Disulfide toward Efficient Water Electrolysis

Dinh

Sun

Pei

et al. 2020

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“…Tremendous efforts are devoted to tuning the composition, structure and morphology of the electrocatalysts. [1][2][3]5] For example, Lin et al [13] synthesized FeOOH/FePO x porous nano- [61] tubes as efficient OER catalysts via hydrothermal treatment of polyoxometalates and Fe salt with the subsequent phosphidation and conducted the regulation of the pore size and surface area. Conventional methods such as hydrothermal treatment or direct calcination of metal salts with heteroatom-containing materials are difficult to precisely control the composition and structure of the catalyst, resulting in unsatisfactory catalytic activity.…”

Section: Advantages Of Synthesizing Materials From Pb/pbamentioning

confidence: 99%

Rational Design and Engineering of Nanomaterials Derived from Prussian Blue and Its Analogs for Electrochemical Water Splitting

Xuan

Zhang

Wang

et al. 2020

Chemistry An Asian Journal

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Electrochemical water splitting (EWS) is a sustainable and promising technology for producing hydrogen as an ideal energy carrier to address environmental and energy issues. Developing highly‐efficient electrocatalysts for hydrogen and oxygen evolution reactions (HER and OER) is critical for increasing the efficiency of water electrolysis. Recently, nanomaterials derived from Prussian blue (PB) and its analogs (PBA) have received increasing attention in EWS applications owing to their unique composition and structure properties. In this Minireview, the latest progress of PB/PBA‐derived materials for EWS is presented. Firstly, the catalyst design principles and the advantages of preparing electrocatalysts with PB/PBA as precursors are briefly introduced. Then, strategies for enhancing the electrocatalytic performance (HER, OER or overall water splitting) were discussed in detail, and the recent development and applications of PB/PBA‐derived catalysts for EWS were summarized. Finally, major challenges and possible future trends related to PB/PBA‐derived functional materials are proposed.

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“…These properties are highly dependent on the chemical composition, size, shape and surface state of the nanocrystals . Therefore, controlled synthesis of nanocrystals is becoming a hot topic in many fields, and lots of efforts have been made to precisely control the morphology and surface state of the nanocrystals . Among various shaped nanocrystals, the sheet‐like ones show promising properties and applications due to their structural simplicity, large surface area, easy charge separation, etc .…”

Section: Figurementioning

confidence: 99%

Crack Formation on Crystalline Bismuth Oxychloride Thin Square Sheets by Using a Wet‐Chemical Method

Wang

Zhou

et al. 2020

ChemNanoMat

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The morphology of nanocrystals is crucial in modulating their properties including optical, chemical and catalytic ones. For the intensively studied sheet-like structures, it is also important to engineer their detailed nanostructures on sheet surfaces. In this work, micron-sized bismuth oxychloride (BiOCl) thin square sheets in tetragonal matlockite-like phase and the corner-truncated ones were successfully synthesized by using a simple wet-chemical method. These square sheets could be partially etched, forming surface cracks with the size and density easily tuned. Two different types of cracks were observed on the surfaces of the corner un-truncated and truncated BiOCl square sheets. Surprisingly, radial cracks formed on the corner-truncated BiOCl sheets, which is attributed to the existence of physical stress during the etching and is highly related to the original nanostructure of the BiOCl sheets. This work provides a wet-chemical method for engineering surface cracks, especially radial cracks, on the surfaces of BiOCl nanosheets, which may be expanded to surface engineering of other nanosheets and will show a great potential in various fields. Nanocrystals, especially semiconductor ones, usually possess unique chemical, electrical, optical and magnetic properties compared to their bulk counterparts. [1][2][3][4][5][6] These properties are highly dependent on the chemical composition, size, shape and surface state of the nanocrystals. [3,[7][8][9][10][11] Therefore, controlled synthesis of nanocrystals is becoming a hot topic in many fields, and lots of efforts have been made to precisely control the morphology and surface state of the nanocrystals. [9,[12][13][14][15][16][17] Among various shaped nanocrystals, the sheet-like ones show promising properties and applications due to their structural simplicity, large surface area, easy charge separation, etc. [18][19][20][21] Sheet-like [a] R.

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Morphology‐Controlled Metal Sulfides and Phosphides for Electrochemical Water Splitting

Cited by 556 publications

References 133 publications

Electronic Modulation of Nickel Disulfide toward Efficient Water Electrolysis

Electronic Modulation of Nickel Disulfide toward Efficient Water Electrolysis

Rational Design and Engineering of Nanomaterials Derived from Prussian Blue and Its Analogs for Electrochemical Water Splitting

Crack Formation on Crystalline Bismuth Oxychloride Thin Square Sheets by Using a Wet‐Chemical Method

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