CoSe_(2)-CuSe_(2)NF双功能电催化剂的制备及其电解水性能的研究  

Preparation of CoSe_(2)-CuSe_(2) NF Bifunctional Electrocatalyst and Its Performance in Water Electrolysis

作　　者：王子晨 陈拥军[1] 骆丽杰[1] 张雪艳 WANG Zichen;CHEN Yongjun;LUO Lijie;ZHANG Xueyan(School of Materials Science and Engineering,Hainan University,Haikou 570228,China)

机构地区：[1]海南大学材料科学与工程学院,海口570228

出　　处：《人工晶体学报》2024年第5期904-912,共9页Journal of Synthetic Crystals

基　　金：海南省自然科学基金青年基金(323QN194);海南大学科研基金(KYDQ(ZR)-22042)。

摘　　要：随着环境污染日益严重、不可再生资源日益枯竭,对清洁、可再生能源的开发非常重要。利用电解水析氢(HER)和析氧(OER)技术生产氢气和氧气,是一种高效、无污染的制备清洁能源的方法。但是,商业贵金属电催化剂价格昂贵、地球丰度低,因此,开发价格低廉、高活性、高稳定性的非贵金属电催化剂意义重大。本研究利用水热法成功制备出一系列具有纳米花结构的双功能电催化剂(CuSe_(2)-CoSe_(2)(1∶1)NF、CuSe_(2)-CoSe_(2)(3∶1)NF、CuSe_(2)-CoSe_(2)(1∶3)NF),通过一系列的表征对催化剂的结构、形貌、元素组成、元素价态进行分析。研究发现CuSe_(2)-CoSe_(2)NF双金属硒化物中CoSe_(2)和CuSe_(2)相互协同作用,促进电子转移,提高电解水性能。此外,CuSe_(2)-CoSe_(2)NF纳米花结构具有较大的比表面积(808 m^(2)/g),暴露更多的活性位点数,进一步提升了催化剂的电化学性能。结果表明,CuSe_(2)-CoSe_(2)(1∶1)NF催化剂在1 mol/L KOH电解液、电流密度为10 mA·cm^(-2)时,HER和OER的过电位为42和204 mV,可持续稳定工作100 h,与商业Pt/C和RuO_(2)性能接近。With the increasing environmental pollution and the depletion of non-renewable resources,it is very important for developing clean and renewable energy.The technology of water-splitting is an efficient and pollution-free method for producing hydrogen and oxygen,which is via two processes of hydrogen evolution reaction(HER)and oxygen evolution reaction(OER).However,the commercial precious metal catalyst has expensive cost and low abundance on earth.Therefore,it is very meaningful for developing the non-noble metal electrocatalysts with lower prices,high activity and stable performance.In this study,a series of nanoflower bifunctional electrocatalysts(CuSe_(2)-CoSe_(2)(1∶1)NF,CuSe_(2)-CoSe_(2)(3∶1)NF and CuSe_(2)-CoSe_(2)(1∶3)NF)were successfully prepared by hydrothermal method.The structure,morphology,elemental composition and valence state of CuSe_(2)-CoSe_(2) NF catalyst were analyzed by a series of characterizations.The result shows that the existence of synergistic between CoSe_(2) and CuSe_(2) in CuSe_(2)-CoSe_(2) NF bimetallic selenide catalyst can accelerate the electron transfer and enhance the water-splitting performance.In addition,the CuSe_(2)-CoSe_(2) NF catalyst with nanoflower structure has large specific surface area(808 m^(2)/g),which can expose more active sites and further increase the electrochemical performance.Consequently,the CuSe_(2)-CoSe_(2)(1∶1)NF catalyst needs 42 and 204 mV overpotentials for HER and OER at 10 mA·cm^(-2) current density in 1 mol/L KOH electrolyte.The stability could maintain 100 h.The CuSe_(2)-CoSe_(2)(1∶1)NF performance is close to that of commercial Pt/C and RuO 2.

关 键 词：硒化物 电解水析氢 电解水析氧 双功能催化剂 纳米花状 双活性位点 

分 类 号：TQ426[化学工程] TQ116.21