The construction of high‐efficiency self‐supported ceramic photoelectrode based on ideal semiconductor materials is essential for achieving effective degradation of pollutants by photoelectrocatalysis (PEC) technology. Herein, a Ti4O7/h‐BN composite ceramic photoelectrode with a unique microstructure was fabricated by a step‐by‐step calcination process and used in PEC water pollution remediation. The PEC activity of Ti4O7 ceramic photoelectrode could be enhanced by introducing hexagonal boron nitride (h‐BN) nanoparticles on the surface. The most optimized Ti4O7/h‐BN photoelectrode exhibited the decolorization rate of active brilliant blue KN‐R at about 97.79% in 30 min. The PEC activities could remain stable during five degradation cycles. The excellent photoelectrocatalytic performance of Ti4O7/h‐BN ceramic photoelectrode could be attributed to the low Tafel slope, low charge transfer resistance, large electrochemical active area, and excellent photo‐generated carrier separation efficiency. A type‐II heterojunction was formed between the Ti4O7 and h‐BN, which caused more effective carrier separation and enhanced the generation of dominant active species •O2− and h+. This work provided a mature synthesis strategy of Ti4O7/h‐BN self‐supported ceramic photoelectrodes with excellent practical application prospects to achieve superior PEC performance for water purification.

中文翻译：

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Ti4O7/h-BN自支撑陶瓷光电极的制备及其光电催化净水性能

基于理想半导体材料构建高效自支撑陶瓷光电极对于光电催化（PEC）技术实现污染物的有效降解至关重要。这里，Ti4氧7通过分步煅烧工艺制备了具有独特微观结构的/h-BN复合陶瓷光电极，并将其用于PEC水污染修复。 Ti的PEC活性4氧7陶瓷光电极可以通过在表面引入六方氮化硼（h-BN）纳米粒子来增强。最优化的钛4氧7/h-BN光电极在30分钟内对活性亮蓝KN-R的脱色率约为97.79%。 PEC 活性在五个降解周期内可以保持稳定。 Ti优异的光电催化性能4氧7/h-BN陶瓷光电极具有低塔菲尔斜率、低电荷转移电阻、大电化学活性面积和优异的光生载流子分离效率。 Ti之间形成II型异质结4氧7h-BN，这导致更有效的载流子分离并增强了主要活性物种•O的生成2−和h+。该工作提供了成熟的Ti合成策略4氧7/h-BN自支撑陶瓷光电极具有良好的实际应用前景，可在水净化方面实现优异的PEC性能。