Construction and High Performance of a Novel Modified Boron-Doped Diamond Film Electrode Endowed with Superior Electrocatalysis

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Abstract

A modified boron-doped diamond (BDD) electrode was prepared by evenly assembling Sb-doped SnO2 nanoparticles on the BDD surface, which possesses excellent electrocatalytic performance and is more suitable to degrade the pollutants. The growth of Sb-doped SnO2−NPs was controlled using micelles of the block copolymer surfactant and homogeneous precipitation approaches. SEM and HRTEM confirmed that BDD still can be fully exposed after modification of Sb-doped SnO2−NPs. The prepared Sb-doped SnO2−NPs/BDD electrode maintained high oxygen evolution potential (2.3 V vs SCE); meanwhile, its conductivity is greatly improved when the resistance decreases to 1.2 from 60.8 kΩ and the reaction activation energy also reduces from 8.02 to 4.93 kJ mol−1, owing to the excellent electrocatalytic performance. Moreover, Sb-doped SnO2−NPs/BDD has higher oxidation ability. The reaction rate constant of 2,4-D on the Sb-doped SnO2−NPs/BDD is 2 times and mineralization current efficiency at 30 min on the Sb-doped SnO2−NPs/BDD is 1.6 times that on the BDD. The time for complete removal of the total organic carbon (TOC) is 240 min on the Sb-doped SnO2−NPs/BDD electrode, while it is beyond 360 min on the BDD. Energy consumption on the BDD is 1.3 times that on the Sb-doped SnO2−NPs/BDD for the TOC total removal. The generation and further oxidation of the intermediates further approved the high efficiency of the Sb-doped SnO2−NPs/BDD.

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