Hierarchical Electrodes of MoS 2 Nanoflakes Wrapped on CNTs in Wood-Derived Porous Carbon Frameworks for a High-Performance Hydrogen Evolution Reaction,ACS Sustainable Chemistry & Engineering

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Hierarchical Electrodes of MoS 2 Nanoflakes Wrapped on CNTs in Wood-Derived Porous Carbon Frameworks for a High-Performance Hydrogen Evolution Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2023-03-30 , DOI: 10.1021/acssuschemeng.2c06950
Danyang Li ₁ , Qiaomei Luo ₁ , Hongqiang Xin ₁ , Chen Wang ₁ , Yiwei Zhao ₁ , Huizhong Bai ₁ , Fei Ma ₁

Affiliation

Controllable fabrication of high-performance and inexpensive heterogeneous catalysts is crucial for the electrochemical hydrogen evolution reaction (HER) and renewable energy. Wood-derived electrodes provide new opportunities. Herein, N-doped carbon nanotubes (CNTs) encapsulating metal particles are in situ generated on graphitized wood (GW)-derived porous carbon frameworks and molybdenum disulfide (MoS₂) nanoflakes are dispersively anchored on CNTs, resulting in hierarchical structures as a hybrid electrode (M/CNT@MoS₂@GW, M = Fe, Co, and Ni). The wood matrix hybrid electrodes with abundant microchannels and hierarchical pores could supply electrolytes for continuous reaction and boost gas diffusion. Consequently, the hybrid electrocatalyst Fe/Fe₃C/CNT@MoS₂@GW exhibits superior HER activity with an overpotential as low as 66.79 mV at 10 mA cm^–2 in an alkaline solution. The activity of the hybrid structure is reduced only by 10.18% at 20 mA cm^–2 after 48 h electrolysis, with nearly no decay after 5000 cyclic voltammetry (CV) cycles, suggesting good stability and durability. Density functional theory calculations illustrate that a thermodynamically favorable hydrogen adsorption free energy (ΔG_H* ≈ 0.07 eV) promotes the catalytic reactions. The results hold great potential in the exploration of wood-derived catalysts for high-performance HER.

中文翻译：

MoS 2 纳米薄片的分层电极包裹在木材衍生的多孔碳骨架中的 CNT 上用于高性能析氢反应

高性能且廉价的多相催化剂的可控制造对于电化学析氢反应 (HER) 和可再生能源至关重要。木材衍生电极提供了新的机会。在此，包裹金属颗粒的 N 掺杂碳纳米管 (CNT)在石墨化木 (GW) 衍生的多孔碳骨架上原位生成，二硫化钼 (MoS ₂ ) 纳米薄片分散锚定在 CNT 上，从而形成作为混合电极的分层结构（M/CNT@MoS ₂ @GW，M = Fe、Co 和 Ni）。具有丰富微通道和分层孔隙的木质基混合电极可以为连续反应提供电解质并促进气体扩散。因此，杂化电催化剂 Fe/Fe₃ C/CNT@MoS ₂ @GW在碱性溶液中表现出优异的 HER 活性，在 10 mA cm ^–2下的过电势低至 66.79 mV 。^{混合结构的活性在20 mA cm -2}下电解48小时后仅降低10.18% ，在5000次循环伏安法（CV）循环后几乎没有衰减，表明具有良好的稳定性和耐久性。密度泛函理论计算表明，热力学有利的氢吸附自由能 (Δ G _H* ≈ 0.07 eV) 促进了催化反应。该结果在探索用于高性能 HER 的木材衍生催化剂方面具有巨大潜力。

更新日期：2023-03-30

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