<br>用于提高电化学产氢的自修复、耐受性超疏气涂层,Small

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用于提高电化学产氢的自修复、耐受性超疏气涂层
Small ( IF 13.0 ) Pub Date : 2024-01-20 , DOI: 10.1002/smll.202309359
Hrisikesh Sarma ₁ , Subhankar Mandal ₂ , Angana Borbora ₁ , Jaysri Das ₁ , Saurav Kumar ₁ , Uttam Manna _{1,

2,

3}

Affiliation

析气电极经常会遇到催化活性位点被堵塞的问题，因为产生的气泡会产生不必要且不可避免的粘附，从而提高了电极的电阻，从而提高了电化学析氢反应 (HER) 的过电势。在此，引入了具有超低气泡粘附力的无催化剂且可自修复的超疏气涂层，以在低（50 mA cm ^-2 ）和高（500 mA cm ^-2 ）电流下实现209和506 mV的显着耗尽过电势分别与裸泡沫镍电极相比。优化的涂层可确保生成的微小 (0.8 ± 0.1 mm) 气泡尽早脱离，从而防止涂层电极电阻出现意外上升。物理（即离子相互作用、氢键等）交联、β-氨基酯型共价交联和增强埃洛石纳米粘土的系统关联使得能够设计出具有基本特性的功能材料，包括改进的机械（韧性为 63.7 kJ m ^-3 ，拉伸模量为 26 kPa）性能和化学性能（极端 pH 值（1 和 14）、盐度等）稳定性、快速 (<10 id=21>° ) 和超低力(4.2 ± 0.4 µN) 气泡附着力。

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Self-healable, Tolerant Superaerophobic Coating for Improving Electrochemical Hydrogen Production

Gas-evolving electrodes often suffer from the blocking of catalytic active sites—due to unwanted and unavoidable adhesion of generated gas bubbles, which elevates the overpotential for the electrochemical hydrogen evolution reaction (HER)— by raising the resistance of the electrode. Here, a catalyst-free and self-healable superaerophobic coating having ultra-low bubble adhesion is introduced for achieving significantly depleted overpotentials of 209 and 506 mV at both low (50 mA cm⁻²) and high (500 mA cm⁻²) current densities, respectively, compared to a bare nickel-foam electrode. The optimized coating ensured an early detachment of the generated tiny (0.8 ± 0.1 mm) gas bubble—and thus, prevented the undesired rise in resistance of the coated electrode. The systematic association of physical (i.e., ionic interactions, H-bonding, etc.) cross-linkage, β-amino ester type covalent cross-linkage and reinforced halloysite nano clay enables the design of such functional material embedded with essential characteristics—including improved mechanical (toughness of 63.7 kJ m⁻³, and tensile modulus of 26 kPa) property and chemical (extremes of pH (1 and 14), salinity, etc.) stability, rapid (<10 min) self-healing ability (even at alkaline condition) and desired bubble-wettability (bubble contact angle of 158.2 ± 0.2^°) with ultralow force (4.2 ± 0.4 µN) of bubble adhesion.

更新日期：2024-01-20

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