B-Co3O4/C复合纳米材料的制备及其电催化析氧性能

本文以雪莲果为碳源，采用热解法制备碳材料(C),以硝酸钴、四硼酸钠和碳材料为原料，通过热解法合成硼掺杂四氧化三钴/碳(B-Co₃O₄/C)复合纳米材料。运用XRD、FTIR、SEM、XPS等手段对其结构、形貌和组成进行表征。利用线性扫描(LSV)和Tafel曲线等电化学测试方法研究了B-Co₃O₄/C复合纳米材料的电催化析氧反应(OER)性能。结果表明，该材料具有较好的电催化OER活性。在1.0mol/L的KOH电解液和10mA·cm^-2的电流密度下，B-Co₃O₄/C复合纳米材料的过电位为293mV,Tafel斜率为45.0mV·dec^-1。在10mA·cm^-2电流密度下连续测试10h, B-Co₃O₄/C的电位变化不大，通过法拉第效率测试该催化剂的产氧效率为94%,说明硼原子的掺入改变了B-Co₃O₄...

Preparation of B-Co3O4/C Composite Nanomaterial and Its Electrocatalytic Performance for Oxygen Evolution Reaction

Electrocatalysis oxygen evolution reaction (OER) is an important half reaction in the energy conversion and storage. OER efficiency is inefficient due to multiple-step proton-coupled electron transfer. Therefore, developing efficient and low-cost OER electrocatalysts is critical for achieving efficient water decomposition and energy storage. Carbon materials (C) were prepared by a pyrolysis method using Smallanthus sonchifolius as carbon source. B-Co₃O₄/C composite nanomaterials were synthesized by the pyrolysis method. The structure, morphology and composition of B-Co₃O₄/C composite materials were characterized by XRD, FTIR, SEM and XPS. The electrochemical OER performance of B-Co₃O₄/C was studied by the electrochemical methods such as linear sweep voltammetry (LSV) and Tafel curves. The results show that the materials exhibit good OER activity with a low overpotential of 293 mV at a current density of 10 mA.cm_-² and a small Tafel slope of 49.97 mV.dec_-1^{. T}he voltage of B-Co₃O₄/C does not change much after the continuous test of 10 h at the current density of 10 mA.cm_-², and the Faraday efficiency test shows that the oxygen production efficiency of B-Co₃O₄/C is 94%, indicating that the doping of B changes the electronic structure of the material, promotes the transfer of electrons and the exchange of substances, and thus reduces the reaction kinetics of the material and enhances its OER performance.