Exploring Battery‐Type ZnO/ZnFe2O4 Spheres‐3D Graphene Electrodes for Supercapacitor Applications: Advantage of Yolk?Shell over Solid Structures

Jhajharia Suman Kumari; Manappadan Zinoy; Selvaraj Kaliaperumal

摘要

Abstract > Recently, a ZnO/ZnFe <sub>2</sub> O <sub>4</sub> composite has been reported to be a promising material for energy storage, owing to its large specific capacity and good redox activity. However, due to the inability to accommodate its strong volumetric variations during operation, it fails to retain its capacitance, which remains as a significant hitch. Herein, we present our attempt towards solving this through a binder‐free electrode design comprising a porous yolk?shell ZnO/ZnFe <sub>2</sub> O <sub>4</sub> composite matrixed inside a 3D network of graphene, which, in turn, is grown on Ni foam. The design exhibits a four‐fold increase in its specific capacitance, yielding 1334?F?g ?1 (specific capacity of 370.5?mAh?g ?1 ) at a current density of 0.5?A?g ?1 in comparison to that of the ZnO/ZnFe <sub>2</sub> O <sub>4</sub> electrodes (309?F?g ?1 (85.8?mAh?g ?1 ) at 0.5?A?g ?1 ) comprising solid metal oxide spheres. The major advantage of the design is the well‐defined yolk?shell architecture that provides free space for volume expansion during long cycling processes and channels for ionic transportation; whereas, the conductive 3D graphene network and porous Ni foam facilitate electronic conduction. The availability of free space in yolk?shell sphere electrodes facilitates the capacitance retention of up to 80?% beyond 5000 cycles at a current density of 1?A?g ?1 , which is in contrast to the capacitance retained by the solid spheres of only approximately 60?%. These results directly demonstrate the significant consequence of the yolk?shell architecture‐based binder‐free design and its promising potential in high‐performing supercapacitors and batteries. </abstract> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract Type =“Main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> > 最近，一个zno / znfe <sub> 2 </ sub> O. <sub> 4 </ sub> 据报道，复合材料是储能的有希望的材料，由于其具有较大的特定能力和良好的氧化还原活动。然而，由于无法在操作期间适应其强大的体积变化，它不能保留其电容，这仍然是一个重要的悬钩。在此，我们展示我们通过包含多孔yolk的无粘合剂电极设计来解决这一点的尝试αZnO / ZnFe <sub> 2 </ sub> O. <sub> 4 </ sub> 在石墨烯的3D网络内归档，又在Ni泡沫上生长。该设计在其特定电容上呈四倍，屈服1334？F？G. ？1 </ sup> （特定容量为370.5？MAH？G ？1 </ sup> ）电流密度为0.5？a？g ？1 </ sup> 与ZnO / Znfe的相比之下 <sub> 2 </ sub> O. <sub> 4 </ sub> 电极（309？f？g ？1 </ sup> （85.8？mah？g ？1 </ sup> ）在0.5？a？g ？1 </ sup> ）包括固体金属氧化物球。设计的主要优点是明确定义的蛋黄λ壳体架构，可在长循环过程和离子运输通道期间为体积扩展提供自由空间;虽然，导电3D石墨烯网络和多孔Ni泡沫促进了电子传导。 yolk中可用空间的可用空间？壳体间电极在电流密度为1Ω·克的电流密度下促进高达80次循环的电容保留。a？g ？1 </ sup> ，与仅大约60Ω％的固体球保持的电容相反。这些结果直接展示了蛋黄的基于贝壳架构的无铅设计的重大结果及其在高性能超级电容器和电池中的有希望的潜力。 </ p> </摘要> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-16042/'>《ChemElectroChem》</a> <b style="margin: 0 2px;">|</b><span>2019年第23期</span><b style="margin: 0 2px;">|</b><span>共10页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Jhajharia Suman Kumari&option=202" target="_blank" rel="nofollow">Jhajharia Suman Kumari;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Manappadan Zinoy&option=202" target="_blank" rel="nofollow">Manappadan Zinoy;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Selvaraj Kaliaperumal&option=202" target="_blank" rel="nofollow">Selvaraj Kaliaperumal;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Nano and Computational Materials Lab. Catalysis DivisionCSIR-National Chemical LaboratoryPune- 411008 India;</p> <p>Nano and Computational Materials Lab. Catalysis DivisionCSIR-National Chemical LaboratoryPune- 411008 India;</p> <p>Nano and Computational Materials Lab. Catalysis DivisionCSIR-National Chemical LaboratoryPune- 411008 India;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/1186.html" title="物理化学（理论化学）、化学物理学">物理化学（理论化学）、化学物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=yolk?shell spheres&option=203" rel="nofollow">yolk?shell spheres;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=graphene hydrogels&option=203" rel="nofollow">graphene hydrogels;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=binder-free electrodes&option=203" rel="nofollow">binder-free electrodes;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=volume expansion&option=203" rel="nofollow">volume expansion;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=supercapacitors&option=203" rel="nofollow">supercapacitors;</a> </p> <div class="translation"> 机译：蛋黄？壳体球体;石墨烯水凝胶;无粘合剂电极;体积膨胀;超级电容器; 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