负载在Co/碳纳米纤维上的分层非晶双金属硫化物纳米片用于协同促进水电解  

Hierarchical amorphous bimetallic sulfide nanosheets supported on Co–C nanofibers to synergistically boost water electrolysis

作　　者：李闱墨 钟梦晓 陈晓杰 任思宇 闫肃 王策 卢晓峰 Weimo Li;Mengxiao Zhong;Xiaojie Chen;Siyu Ren;Su Yan;Ce Wang;Xiaofeng Lu(Alan G.MacDiarmid Institute,College of Chemistry,Jilin University,Changchun 130012,China)

机构地区：[1]Alan G.MacDiarmid Institute,College of Chemistry,Jilin University,Changchun 130012,China

出　　处：《Science China Materials》2023年第6期2235-2245,共11页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51973079);the Science and Technology Development Plan of Jilin Province,China(20220402008GH)。

摘　　要：设计分层异质结构作为一种经济且高效的催化剂,以实现水分解的电子和界面工程,是能源存储与转化中的一个有意义的决策.在这项工作中,通过静电纺丝-碳化-电沉积的策略,制备了负载在嵌入Co纳米颗粒的碳纤维上的非晶态NiFeS纳米片(Co-C/NiFeS纳米纤维)催化剂.该催化剂具有优异的析氧反应(OER)活性,在1 mol L^(-1)KOH溶液中,在10 mA cm^(-2)下的过电位为233 mV,Tafel斜率为53.1 mV dec^(-1),同时还具有良好的析氢反应活性.此外,由Co-C/NiFeS纳米纤维作为阳极,商用Pt/C作为阴极构建的碱性Pt/C‖Co-C/NiFeS电解槽在10 mA cm^(-2)下实现1.48 V的低电池电压,优于基准Pt/C‖RuO_(2)电解槽和许多其他报道的电解槽.作为双功能电催化剂,Co-C/NiFeS‖Co-C/NiFeS自身组装的电解槽表现出70小时的长期稳定性,显著优于Pt/C‖RuO_(2)电解槽.该催化剂显著的OER性能得益于Co-C纳米纤维核与非晶NiFeS纳米片鞘组成的明显分层异质结构以及生成的高导电碳纤维基底,这些结构特征赋予该材料丰富的暴露活性位点、良好的导电性和坚固的结构稳定性.因此,这项工作提出了一种简单且有效的方法来制备具有优异电催化性能的非贵金属基催化剂,以用于实际的能量转换和存储.The design of a hierarchical heterostructure as a cost-effective and high-efficiency catalyst to realize electronic and interfacial engineering for the oxygen evolution reaction(OER)is a meaningful option in energy storage and conversion.In this work,amorphous NiFeS nanosheets supported on carbon nanofibers embedded with cobalt nanoparticles(Co-C/NiFeS nanofibers)catalysts are fabricated via the electrospinning-carbonization-electrodeposition strategy.The optimized catalyst possesses a superior OER activity with a low overpotential of 233 mV at 10 mA cm^(-2)and a Tafel slope of 53.1 mV dec^(-1)in 1 mol L^(-1)KOH solution,together with a favorable hydrogen evolution reaction activity.Moreover,an alkaline Pt/C‖Co-C/NiFeS electrolyzer constructed with Co-C/NiFeS nanofibers as the anode and commercial Pt/C as the cathode achieves a low cell voltage of 1.48 V at 10 mA cm^(-2),which is superior to those of the benchmark Pt/C‖RuO_(2)cell and many other reported electrolyzers.As a bifunctional electrocatalyst,the Co-C/NiFeS‖Co-C/NiFeS electrolyzer can be assembled,exhibiting outstanding long-term stability of 70 h,which significantly outperforms that of the Pt/C‖RuO_(2)electrolyzer.The remarkable OER performance of the catalyst benefits from the distinct hierarchical heterostructure with Co-C nanofibers core and amorphous NiFeS nanosheets sheath and the generated highly conductive fibrous carbon substrate,endowing it with a large number of exposed active sites,great electrical conductivity and impregnable structural stability.Thus,this work demonstrates a facile and efficient approach to fabricate non-noble metal-based catalysts with superior electrocatalytic performance for practical energy conversion and storage.

关 键 词：碳纳米纤维 静电纺丝 水电解 析氧反应 过电位 金属硫化物 析氢反应 电催化剂 

分 类 号：TQ116.2[化学工程—无机化工] TQ426