Refining d-band center in Ni0.85Se by Mo doping: A strategy for boosting hydrogen generation via coupling electrocatalytic oxidation 5-hydroxymethylfurfural

Yang, Chunming; Wang, Chuantao; Zhou, Lihai; Duan, Wengui; Song, Yuanyuan; Zhang, Fuchun; Zhen, Yanzhong; Zhang, Junjun; Bao, Weiwei; Lu, Yuxuan; Wang, Danjun; Feng, Feng

doi:10.1016/j.cej.2021.130125

Cited by 119 publications

(52 citation statements)

References 47 publications

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“…Figure 5A,B shows the partial density of states (PDOS) on the surface Co sites of Co 0.85 Se (−1.804 eV) and c‐CoSe 2 @Co(OH) 2 (−2.367 eV) suggesting the downshift of d band center after the reconstruction. According to the d band theory, the downshift of the d band center means the H adsorption energy on the surface of the catalysts was weakened, which facilitated the H desorption from the catalysts surface and can be responsible for the enhancement of HER performance 35‐39 . Here, the HER reaction performed under alkaline solution involved the first step of H 2 O dissociation to H* and OH* (Volmer step) and the followed generation hydrogen from H* to release (Heyrovsky step) according to the above Tafel slope results.…”

Section: Resultsmentioning

confidence: 98%

Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media

Bai

Wang

et al. 2022

Intl J of Energy Research

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Summary The design of hybrid structures for catalysts toward alkaline hydrogen evolution reaction (HER) is a significant strategy to promote its reaction kinetics. Herein, we synthesize cubic CoSe2 and Co(OH)2 (c‐CoSe2@Co(OH)2) hybrid catalysts from the self‐reconstruction of flower like Co0.85Se via a simple hydrothermal method accompanied by the addition of NaOH. This strategy is conducive to the distinct enhancement in HER catalytic activity, featuring the lower overpotential of 156 mV at the current density of 10 mA cm−2 than that of Co0.85Se (288 mV). The integrative techniques were used to analyze the reason of activity improvement for the hybrid catalysts. The ultraviolet photoelectron spectroscopy (UPS) analysis demonstrates that the catalyst c‐CoSe2@Co(OH)2 possesses good conductivity and the stronger ability to donate electrons. Besides, the DFT calculations reveal that the lower values of ∆GH2normalO(water dissociation) and ΔGH* (hydrogen adsorption) accompanied by the downshifted d‐band center effectively improve the kinetics of HER activity. All of these demonstrate that the derived c‐CoSe2@Co(OH)2 hybrid from self‐reconstruction of the Co0.85Se obtain modulated electronic structure and improved conductivity effectively enhancing the catalytic activity.

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Section: Resultsmentioning

confidence: 98%

Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media

Bai

Wang

et al. 2022

Intl J of Energy Research

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“…With a small Tafel slope, the hydrogen evolution rate would increase rapidly with less increment of the overpotential. The CoFeCr LDH electrode reveals a smaller Tafel slope of 95.1 mV dec −1 compared with that of CoFe LDH (130.3 mV dec −1 ), indicating superior HER kinetics ( Figure 4 c) [ 27 ]. The electrochemical impedance spectroscopy curves also illustrate smaller electron transfer resistance (R ct ) and thus faster HER kinetics for the CoFeCr LDH electrode, comparing with the undoped CoFe LDH electrode ( Figure 4 d) [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

Chromium-Modified Ultrathin CoFe LDH as High-Efficiency Electrode for Hydrogen Evolution Reaction

Zhang

et al. 2022

Nanomaterials

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Hydrogen evolution reaction (HER) has a dominant function in energy conversion and storage because it supplies a most effective way for converting electricity into sustainable high-purity hydrogen. Layered double hydroxides (LDHs) have shown promising performance in the process of electrochemical water oxidation (a half-reaction for water splitting). Nevertheless, HER properties have not been well released due to the structural characteristics of related materials. Herein, a simple and scalable tactics is developed to synthesize chromium-doped CoFe LDH (CoFeCr LDH). Thanks to oxygen vacancy, optimized electronic structure and interconnected array hierarchical structure, our developed ternary CoFeCr-based layered double hydroxide catalysts can provide 10 mA cm−2 current density at −0.201 V vs. RHE with superior long-term stability in alkaline electrolyte. We anticipate that the simple but feasible polymetallic electronic modulation strategy can strengthen the electrocatalytic property of the layered double hydroxides established in the present study, based on a carbon neutral and hydrogen economy.

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“…The MoO 2 –FeP@C||MoO 2 –FeP@C electrolyzer afforded a voltage of 1.486 V at 10 mA cm −2 for simultaneously generation of FDCA H 2 . [ 28 ] Other catalysts such as NiSe@NiO x core–shell nanowires, [ 62 ] Mo‐doped Ni 0.85 Se on nickel foam (NF@Mo–Ni 0.85 Se), [ 31 ] Cu x S@NiCo‐LDHs core–shell nanoarray, [ 61 ] and nickel‐cobalt‐layered double‐hydroxide NSs modifying Cu nanowire arrays on Cu foam (NiCo NSs /Cu NWs ) [ 65 ] were also reported in the HMF electrolysis system which shows desirable catalytic performance ( Table 4 ).…”

Section: Organic Eor Assisted With Her For H2 Generationmentioning

confidence: 99%

“…The hybrid electrolysis system is capable of simultaneously generating H 2 and valuable byproducts with theoretically better energy efficiency than conventional water splitting. [31] The production of small molecule is preferred to replace OER given the following criteria: 1) the small molecule is soluble in aqueous media; 2) the small molecule is comparatively cheap or abundant; 3) the electro-oxidized product is valuable and nonpolluting; and 4) the small molecule is easily electro-oxidized with low overpotential. [13,25,32] To evaluate the performances of H 2 generation for the hybrid electrolysis system, we discuss the important electrolysis parameters, including the voltage, current density, stability, yield, selectivity, and Faraday efficiency (FE).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Hydrogen Generation by Oxygen Evolution Reaction‐Alternative Anodic Oxidation Reactions

Liu

Han

Guo

et al. 2022

Adv Energy and Sustain Res

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Hydrogen (H2) as an environmentally friendly and sustainable energy carrier has been regarded as one of the most promising alternatives to carbon‐based fossil fuels. Electrochemical water splitting powered by renewable electricity provides a promising strategy for H2 production, but its energy efficiency is strongly limited by the kinetically sluggish anodic oxygen evolution reaction (OER), which consumes ≈90% electricity in the water‐splitting process. A new strategy is urgently needed to reduce its energy consumption. Small‐molecule electro‐oxidation reactions that replace OER have attracted increasing attention due to the advantages of low theoretical thermodynamic potential and the benefit of producing value‐added chemicals compared with OER. Hybrid electrolysis systems, by coupling cathodic hydrogen evolution reaction (HER) with anodic small‐molecule oxidation reactions, have been proposed, which can produce high‐purity H2 and value‐added products. This review aims to systematically summarize the recent research on OER‐alternative reactions at the anode for energy‐efficient water splitting. The state‐of‐the art electrocatalysts for OER‐alternative reactions are first presented. The electrolysis performance in hybrid electrolysis regarding the conversion rate, selectivity, yield, and corresponding Faraday efficiency of anodic value‐added products is then evaluated. Finally, the challenges and perspectives are discussed and it is suggested to develop energy‐efficient and economically viable hybrid electrolysis systems.

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Refining d-band center in Ni0.85Se by Mo doping: A strategy for boosting hydrogen generation via coupling electrocatalytic oxidation 5-hydroxymethylfurfural

Cited by 119 publications

References 47 publications

Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media

Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media

Chromium-Modified Ultrathin CoFe LDH as High-Efficiency Electrode for Hydrogen Evolution Reaction

Electrochemical Hydrogen Generation by Oxygen Evolution Reaction‐Alternative Anodic Oxidation Reactions

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Refining d-band center in Ni0.85Se by Mo doping: A strategy for boosting hydrogen generation via coupling electrocatalytic oxidation 5-hydroxymethylfurfural

Cited by 119 publications

References 47 publications

Self‐reconstruction‐induced c‐CoSe 2 coupled with co( OH ) 2 from Co 0. 85 Se For efficient HER Electrocatalysis in alkaline media

Self‐reconstruction‐induced c‐CoSe 2 coupled with co( OH ) 2 from Co 0. 85 Se For efficient HER Electrocatalysis in alkaline media

Chromium-Modified Ultrathin CoFe LDH as High-Efficiency Electrode for Hydrogen Evolution Reaction

Electrochemical Hydrogen Generation by Oxygen Evolution Reaction‐Alternative Anodic Oxidation Reactions

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Product

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Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media

Self‐reconstruction‐induced c‐CoSe ₂ coupled with co( OH ) ₂ from Co _0. ₈₅ Se For efficient HER Electrocatalysis in alkaline media