Wang Yunting, Xue Yudong, Zhang Chunhui
School of Chemical and Environmental Engineering, China University of Mining and Technology of Beijing, Beijing, 100083, P. R. China.
College of Engineering, Korea University, Seoul, 136-701, Republic of Korea.
Small. 2021 Apr;17(17):e2006587. doi: 10.1002/smll.202006587. Epub 2021 Mar 14.
The chlorine evolution reaction (CER) is a critical and commercially valuable electrochemical reaction in industrial-scale utilization, including the Chlor-alkali industry, seawater electrolysis, and saline wastewater treatment. Aiming at boosting CER electrocatalysis, hybrid IrO /TiO nanosheet arrays (NSAs) with rational surface and interfacial tuning strategies are proposed in this study. The IrO /TiO NSAs exhibit superb CER electrocatalytic activity with a low overpotential (44 mV) at 10 mA cm , low Tafel slope of 40 mV dec , high CER selectivity (95.8%), and long-term durability, outperforming most of the existing counterparts. The boosting mechanism is proposed that the aerophobic/hydrophilic surface engineering and interfacial electronic structure tuning of IrO /TiO are beneficial for the Cl mass-transfer, Cl release, and Volmer-Heyvrosky kinetics during the CER. Practical saline wastewater treatment by using the IrO /TiO NSAs electrode is further conducted, demonstrating it has a higher p-nitrophenol degradation ratio (95.10% in 60 min) than that of other electrodes. The rational surface and interfacial engineering of IrO /TiO NSAs can open up a new way to design highly efficient electrocatalysts for industrial application and environmental remediation.
析氯反应（CER）是工业规模利用中一种关键且具有商业价值的电化学反应，包括氯碱工业、海水电解和含盐废水处理。本研究针对提高CER电催化性能，提出了具有合理表面和界面调控策略的IrO₂/TiO₂混合纳米片阵列（NSAs）。IrO₂/TiO₂ NSAs在10 mA cm⁻²时表现出优异的CER电催化活性，过电位低（44 mV），塔菲尔斜率为40 mV dec⁻¹，CER选择性高（95.8%），且具有长期耐久性，优于大多数现有同类材料。提出的促进机制是，IrO₂/TiO₂的憎气/亲水性表面工程和界面电子结构调控有利于CER过程中的Cl⁻传质、Cl⁻释放以及Volmer - Heyvrosky动力学。进一步利用IrO₂/TiO₂ NSAs电极进行实际含盐废水处理，结果表明其对对硝基苯酚的降解率（60分钟内为95.10%）高于其他电极。IrO₂/TiO₂ NSAs合理的表面和界面工程可为设计用于工业应用和环境修复的高效电催化剂开辟一条新途径。
