A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

Xue, Sen; Liu, Zhibo; Ma, Chaoqun; Cheng, Hui‐Ming; Ren, Wencai

doi:10.1016/j.scib.2019.10.024

Cited by 69 publications

(42 citation statements)

References 41 publications

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“…7f, g and S49). The volume-time curve for H 2 and O 2 is obtained by water drainage method at 0, 10,15,20,25,30,35,40,45, and 50 min measured at 30.0 mA. The volume-time curve for H 2 and O 2 is about 2:1, and they are close to the theoretical values, indicating the nearly 100% Faradic efficiency.…”

Section: Ws Catalytic Performancementioning

confidence: 62%

“…on 3D porous substrate (e.g., NF) is significant, which can accelerate the mass transfer and bubbles escape during the electrochemical reaction process, and provide large specific surface area to expose abundant active sites [15,29]. MoS 2 /Ni 3 S 2 heterostructure nanowires selfsupported on NF were constructed by Cheng et al [30]. It exhibits a small overpotential of 182 mV at 500 mA cm −2 for HER, which is comparable to Pt/C.…”

Section: H O Cmentioning

confidence: 99%

“…MoS 2 /Ni 3 S 2 heterostructure nanowires self-supported on NF were constructed by Cheng et al . [ 30 ]. It exhibits a small overpotential of 182 mV at 500 mA cm −2 for HER, which is comparable to Pt/C.…”

Section: Introductionmentioning

confidence: 99%

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Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition

et al. 2021

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Constructing heterojunction is an effective strategy to develop high-performance non-precious-metal-based catalysts for electrochemical water splitting (WS). Herein, we design and prepare an N-doped-carbon-encapsulated Ni/MoO2 nano-needle with three-phase heterojunction (Ni/MoO2@CN) for accelerating the WS under industrial alkaline condition. Density functional theory calculations reveal that the electrons are redistributed at the three-phase heterojunction interface, which optimizes the adsorption energy of H- and O-containing intermediates to obtain the best ΔGH* for hydrogen evolution reaction (HER) and decrease the ΔG value of rate-determining step for oxygen evolution reaction (OER), thus enhancing the HER/OER catalytic activity. Electrochemical results confirm that Ni/MoO2@CN exhibits good activity for HER (ƞ-10 = 33 mV, ƞ-1000 = 267 mV) and OER (ƞ10 = 250 mV, ƞ1000 = 420 mV). It shows a low potential of 1.86 V at 1000 mA cm−2 for WS in 6.0 M KOH solution at 60 °C and can steadily operate for 330 h. This good HER/OER performance can be attributed to the three-phase heterojunction with high intrinsic activity and the self-supporting nano-needle with more active sites, faster mass diffusion, and bubbles release. This work provides a unique idea for designing high efficiency catalytic materials for WS.

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Section: Ws Catalytic Performancementioning

confidence: 62%

Section: H O Cmentioning

confidence: 99%

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Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition

et al. 2021

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“…The one-step direct conversion of the mixed precursors via which different components are simultaneously generated and hybridized in situ represents the most straightforward and effective means to harvest heterostructures. 88 Recently, laser has been used to irradiate the mixed precursors for the construction of such structures ( Figure 7A). 89 Compared with the traditionally used methods, a laser-mediated process can significantly reduce the reaction time from many hours to several minutes and even seconds, suggesting an essentially improved efficiency.…”

Section: Laser-assisted Fabrication Of Heterostructuresmentioning

confidence: 99%

Laser Irradiation of Electrode Materials for Energy Storage and Conversion

et al. 2020

Matter

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In addition to its traditional use, laser irradiation has found extended application in controlled manipulation of electrode materials for electrochemical energy storage and conversion, which are primarily enabled by the laser-driven rapid, selective, and programmable materials processing at low thermal budgets. In this Review, we summarize the recent progress of laser-mediated engineering of electrode materials, with special emphases on its capability of controlled introduction of structural defects, precise fabrication of heterostructures, and elaborate construction of integrated electrode architecturesall of which are highly desired for many electrochemical processes, yet difficult to be precisely synthesized via conventional technologies. After a brief introduction of the fundamental mechanism of laser processing, its practical use for structural regulation of electrode materials is discussed in detail. The application of these laserenabled materials for supercapacitors, rechargeable batteries, and some fundamental electrocatalytic reactions enabling energy conversion is then summarized. Finally, we highlight the challenges faced at the current stage, aiming to shed some light on the future development of this prosperous field.

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“…Stimulated by the development of alkaline exchange membranes [4], as well as highly efficient and stable platinum group materials (PGM)-free electrocatalysts for alkaline oxygen electrode reactions (oxygen reduction and oxygen evolution reactions) in the past decades [5,6], alkaline exchange membrane-based fuel cells (AEMFCs) and water electrolyzers (AEMWEs) have received considerable attentions as the alternatives to their proton exchange membrane-based counterparts [7,8]. However, the kinetics of HOR/HER in alkaline media, even for the PGM-based electrocatalysts, are over 100 times slower than those in acidic media [9][10][11][12]. More critically, despite considerable efforts have been devoted to investigating these two reversible reactions, the reason for the significantly kinetics-decreasing derived from the pH effect of electrolytes, as well as the mechanism for HOR/HER under alkaline media, still remain debatable [13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

Yang

et al. 2020

Science Bulletin

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A highly active and durable electrocatalyst for large current density hydrogen evolution reaction

Cited by 69 publications

References 41 publications

Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition

Three-Phase Heterojunction NiMo-Based Nano-Needle for Water Splitting at Industrial Alkaline Condition

Laser Irradiation of Electrode Materials for Energy Storage and Conversion

Discrepant roles of adsorbed OH* species on IrWO for boosting alkaline hydrogen electrocatalysis

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