Underfocus Laser Induced Ni Nanoparticles Embedded Metallic MoN Microrods as Patterned Electrode for Efficient Overall Water Splitting,Advanced Science

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Underfocus Laser Induced Ni Nanoparticles Embedded Metallic MoN Microrods as Patterned Electrode for Efficient Overall Water Splitting
Advanced Science ( IF 14.3 ) Pub Date : 2022-02-03 , DOI: 10.1002/advs.202105869
Yuke Chen ₁ , Yijie Wang ₁ , Jiayuan Yu ₁ , Guowei Xiong ₁ , Hongsen Niu ₂ , Yang Li ₂ , Dehui Sun ₁ , Xiaoli Zhang ₃ , Hong Liu _{1,

4} , Weijia Zhou ₁

Affiliation

Transition metal nitrides have shown large potential in industrial application for realization of the high active and large current density toward overall water splitting, a strategy to synthesize an inexpensive electrocatalyst consisting of Ni nanoparticles embedded metallic MoN microrods cultured on roughened nickel sheet (Ni/MoN/rNS) through underfocus laser heating on NiMoO₄·xH₂O under NH₃ atmosphere is posited. The proposed laser preparation mechanism of infocus and underfocus modes confirms that the laser induced stress and local high temperature controllably and rapidly prepared the patterned Ni/MoN/rNS electrodes in large size. The designed Ni/MoN/rNS presents outstanding catalytic performance for hydrogen evolution reaction (HER) with a low overpotential of 67 mV to deliver a current density of 10 mA cm⁻² and for the oxygen evolution reaction (OER) with a small overpotential of 533 mV to deliver 200 mA cm⁻². Density functional theory (DFT) calculations and Kelvin probe force microscopy (KPFM) further verify that the constructed interface of Ni/MoN with small hydrogen absorption Gibbs free energy (ΔG_H*) (−0.19 eV) and similar electrical conductivity between Ni and metallic MoN, which can explain the high intrinsic catalytic activity of Ni/MoN. Further, the constructed two-electrode system (−) Ni/MoN/rNS||Ni/MoN/rNS (+) is employed in an industrial water-splitting electrolyzer (460 mA cm⁻² for 120 h), being superior to the performance of commercial nickel electrode.

中文翻译：

欠焦激光诱导镍纳米颗粒嵌入金属 MoN 微棒作为图案电极，用于高效的整体水分解

过渡金属氮化物在工业应用中显示出巨大的潜力，可实现高活性和大电流密度以实现整体水分解，这是一种合成廉价电催化剂的策略，该催化剂由在粗糙镍片上培养的 Ni 纳米颗粒嵌入金属 MoN 微棒 (Ni/MoN/ rNS) 通过在 NH _{3下对 NiMoO}₄ ·xH ₂ O 进行欠焦激光加热气氛被设定。所提出的聚焦和欠聚焦模式的激光制备机制证实了激光诱导应力和局部高温可控制地快速制备大尺寸的图案化 Ni/MoN/rNS 电极。所设计的 Ni/MoN/rNS 对析氢反应 (HER) 具有出色的催化性能，具有 67 mV 的低过电位，可提供 10 mA cm ^-2的电流密度，对析氧反应 (OER) 具有出色的过电位533 mV 以提供 200 mA cm ^-2。密度泛函理论 (DFT) 计算和开尔文探针力显微镜 (KPFM) 进一步验证了所构建的 Ni/MoN 界面具有较小的吸氢吉布斯自由能 (Δ G _H*) (-0.19 eV) 和 Ni 和金属 MoN 之间相似的电导率，这可以解释 Ni/MoN 的高本征催化活性。此外，构建的双电极系统（-）Ni/MoN/rNS||Ni/MoN/rNS（+）用于工业水分解电解槽（460 mA cm ^-2 120 h），优于商业镍电极的性能。

更新日期：2022-02-03

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