B-Co3O4/C复合纳米材料的制备及其电催化析氧性能
Preparation of B-Co3O4/C Composite Nanomaterial and Its Electrocatalytic Performance for Oxygen Evolution Reaction
投稿时间:2022-07-14  修订日期:2022-08-17
DOI:
中文关键词:  热解法  B-Co3O4/C  电催化  析氧反应
英文关键词:Pyrolysis, B-Co3O4/C, Electrocatalysis, Oxygen  evolution reaction
基金项目:国家自然科学基金项目(21801176)和内江师范学院重点科研项目(2021ZD05)
作者单位邮编
翟好英 内江师范学院化学化工学院 641100
晏兴荣 内江师范学院化学化工学院 
邹自力 内江师范学院化学化工学院 
刘义武 内江师范学院化学化工学院 641100
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中文摘要:
      电催化析氧反应(OER)是能源转化和储存中重要的半反应。由于其多步质子耦合电子转移使得OER效率较低。因此,开发高效、低成本OER电催化剂是实现高效水分解和储能的关键。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)和塔菲尔(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OER性能。结果表明,该材料具有较好的电催化OER活性。在1.0 mol.L-1KOH电解液和10 mA.cm-2的电流密度下,B-Co3O4/C复合纳米材料的过电位为293 mV,塔菲尔斜率为49.97 mV.dec-1在10 mA.cm-2电流密度下连续测试10 h,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/C的电子结构,促进电子的转移和物质的交换,从而降低了材料的反应动力学和增强了其OER性能。
英文摘要:
      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. The 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.
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