氧空位满足部分S取代：在NiFe-LDH中实现明显协同效应和可调电化学行为以增强OER和电容性能的有效策略,Inorganic Chemistry Frontiers

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氧空位满足部分S取代：在NiFe-LDH中实现明显协同效应和可调电化学行为以增强OER和电容性能的有效策略
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2023-07-24 , DOI: 10.1039/d3qi01131c
Dong Shi ₁ , Yajun Ji ₁ , Faxue Lu ₁ , Junnan Yao ₁ , Shixiong Zhang ₁ , Pengcheng Zhang ₁

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具有高电化学活性的双功能电极（析氧反应（OER）和电容特性）对于超级电容器和水分解装置至关重要。在此，通过结合酸刻蚀和硫化策略，精心制作了硫和氧空位共掺杂的镍铁层状双氢氧化物（NiFe-LDHS）电极。这项工作证实了S和氧空位之间的强协同作用，这通过增加电极的本征活性双内部极化场路径。此外，系统研究了S掺杂对电极双功能的影响。表征和测量结果表明，S掺杂后的样品表现出可调节的电化学行为，从而进一步提高了电极的双功能活性。因此，NiFe-LDHS电极表现出出色的催化和储能性能。^{具体而言，在10 mA cm -2}下OER过电势仅为224 mV ，在碱性电解液中在50 mA cm ^-2下稳定性可达32 h 。在电容性能方面，NiFe-LDHS电极表现出6.33 F cm ^{-2的高面积电容}。^{组装的NiFe-LDHS//AC非对称超级电容器（ASC）具有2.0 V电池电压，表现出0.279 mWh cm -2}的高能量密度和长循环稳定性。这些结果表明NiFe-LDHS电极在水分解装置和超级电容器中具有广泛的适用性，并揭示了推进高性能双功能电极材料构建的广阔前景。

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Oxygen vacancies meet partial S substitution: an effective strategy to achieve obvious synergistic effects and adjustable electrochemical behavior in NiFe-LDH for enhanced OER and capacitive performance

A bifunctional electrode (oxygen evolution reaction (OER) and capacitive properties) with high electrochemical activity is crucial for both supercapacitors and water splitting devices. Herein, a S and oxygen vacancy co-doped nickel-iron layered double hydroxide (NiFe-LDHS) electrode was delicately fabricated through combining acid etching and sulfidation strategies. The strong synergy between S and oxygen vacancies was firmly confirmed in this work, which increased the intrinsic activity of the electrode via a double internal polarization field path. Furthermore, the impact of S doping on the bifunctionality of the electrode was systematically studied. The characterization and measurement results demonstrated that the sample after S doping exhibited adjustable electrochemical behavior, thereby improving the bifunctional activity of the electrode further. Thus, the NiFe-LDHS electrode showed outstanding catalytic and energy storage properties. Specifically, the OER overpotential was only 224 mV at 10 mA cm⁻², and the stability in an alkaline electrolyte could reach 32 h at 50 mA cm⁻². In terms of capacitive performance, the NiFe-LDHS electrode showed a high areal capacitance of 6.33 F cm⁻². The assembled NiFe-LDHS//AC asymmetric supercapacitor (ASC) with 2.0 V cell voltage displayed a high energy density of 0.279 mW h cm⁻² and long cycling stability. These results indicated the versatile applicability of the NiFe-LDHS electrode in both water splitting devices and supercapacitors and revealed promising prospects for advancing the construction of high-performance bifunctional electrode materials.

更新日期：2023-07-24

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