非晶<strong>Co-W-B/</strong>碳布复合电极材料的制备及其电解水催化性能

doi:10.11901/1005.3093.2019.397

材料研究学报

2020, Vol. 34

Issue (4): 263-271 DOI: 10.11901/1005.3093.2019.397

研究论文

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非晶Co-W-B/碳布复合电极材料的制备及其电解水催化性能

施嘉伦, 盛敏奇(

), 吴琼, 吕凡

苏州大学沙钢钢铁学院苏州 215137

Preparation of Electrode Materials of Amorphous Co-W-B/Carbon Cloth Composite and their Electro-catalytic Performance for Electrolysis of Water

SHI Jialun, SHENG Minqi(

), WU Qiong, LV Fan

School of Iron and Steel, Soochow University, Suzhou 215137, China

引用本文:

施嘉伦, 盛敏奇, 吴琼, 吕凡. 非晶Co-W-B/碳布复合电极材料的制备及其电解水催化性能[J]. 材料研究学报, 2020, 34(4): 263-271.
Jialun SHI, Minqi SHENG, Qiong WU, Fan LV. Preparation of Electrode Materials of Amorphous Co-W-B/Carbon Cloth Composite and their Electro-catalytic Performance for Electrolysis of Water[J]. Chinese Journal of Materials Research, 2020, 34(4): 263-271.

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摘要:

通过湿化学还原在碳布(CC)表面沉积非晶Co-W-B催化活性物质，制备一种自支撑Co-W-B/碳布(Co-W-B/CC)复合电极材料。电化学研究结果表明，Co-W-B/CC材料在NaOH溶液(1 mol/L)中表现出良好的电解水催化性能。制备过程中[WO₄^2-]/([WO₄^2-]+[Co²⁺])比值为50%的Co-50W-B/CC样品其催化活性最高：10 mA/cm²时的OER过电位为0.394V，OER过程的Tafel斜率为96.8 mV/dec；-10 mA/cm²时的HER过电位为0.098 V，HER过程的Tafel斜率为117.4 mV/dec。对电化学阻抗的分析结果表明，本征催化活性和电化学活性面积两者的提高，使Co-50W-B/CC样品在较低的电流密度下具有与贵金属基材料相近的催化活性。

关键词 ：复合材料, Co-W-B/CC, 复合电极, 非晶材料, 析氧反应, 析氢反应, 电催化

Abstract：

Amorphous Co-W-B was deposited on carbon cloth (CC) to fabricate a self-supported Co-W-B/CC composite electrode by using chemical reduction method. Electrochemical analysis show that Co-W-B/CC materials exhibited excellent electrocatalytic performance for electrolysis of water in 1 mol/L NaOH solution. Among others, the Co-50W-B/CC (the ratio of [WO₄^2-]/([WO₄^2-]+[Co²⁺]) is 50% in the synthesis process) shows the best electrocatalytic activity, i.e. for the Co-50W-B/CC catalyst, when the low overpotential is 0.394 V by ampere density of 10mA/cm², the corresponding Tafel slope is 96.8 mV/dec for the oxygen evolution reaction (OER), whilst when the overpotential is 0.098 V by ampere density of -10 mA/cm², the corresponding Tafel slope is 117.4 mV/dec for the hydrogen evolution reaction (HER). EIS analysis result implies that the Co-50W-B/CC possesses nearly the same catalytic activity as the noble metal-based materials at low current density, which can mainly be attributed to both the high intrinsic catalytic activity and the large electrochemical active area.

Key words： composite Co-W-B/CC composite electrode amorphous material oxygen evolution reaction (OER) hydrogen evolution reaction (HER) electrocatalysis

收稿日期: 2019-08-15

ZTFLH:

TB322

基金资助:国家重点研发计划(No. 2018YFE0306105);国家自然科学基金(No. 51504104)

作者简介: 施嘉伦，男，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.397 或 https://www.cjmr.org/CN/Y2020/V34/I4/263

图1 CC和Co-50W-B/CC的SEM照片、(c-inset) Co-50W-B/CC的EDX能谱以及Co-50W-B/CC的表面元素分布

图2 χW%值([WO42-]/([WO42-]+[Co2+])摩尔百分比)对Co-W-B催化活性物质中元素含量的影响和 CC以及不同Co-W-B/CC样品的XRD衍射图谱

图3 Co-66W-B/CC和Co-75W-B/CC的SEM照片

图4 不同Co-W-B/CC样品的LSV曲线(嵌入图为1.50~1.75VvsRHE电位范围的局部放大图)、Co-50W-B/CC、CC、Co-B/CC和RuO2样品的LSV曲线、 Co-50W-B/CC、CC、Co-B/CC和RuO2样品的Tafel斜率、不同Co-W-B/CC样品和Co-50W-B/CC、Co-B/CC和RuO2样品的EIS曲线以及不同样品的Cdl-OER值和j0-real-OER值

图5 不同Co-W-B/CC样品的LSV曲线(嵌入图为-0.10~-0.30VvsRHE电位范围的局部放大图)、Co-50W-B/CC、CC、Co-B/CC和Pt/C样品的LSV曲线、Co-50W-B/CC、CC、Co-B/CC和Pt/C样品的Tafel斜率、不同Co-W-B/CC样品的EIS曲线、Co-50W-B/CC、Co-B/CC和Pt/C样品的EIS曲线以及不同样品的Cdl-HER值和j0-real-HER值

图6 Co-50W-B/CC在OER过程中循环1000次前后的LSV曲线、Co-50W-B/CC在HER过程中循环1000次前后的LSV曲线、Co-50W-B/CC在30 mA/cm2和-30 mA/cm2下的V-t曲线以及Co-50W-B/CC(+)??Co-50W-B/C(-)与RuO2(+)??Pt/C(-)的全解水活性比较

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