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Herein, a layer\u2010by\u2010layer (LbL) assembly\u2010induced metal electrodeposition approach is introduced to prepare a variety of highly porous 3D\u2010current collectors with high flexibility, metallic conductivity, and large surface area. In this study, a few metal nanoparticle (NP) layers are LbL\u2010assembled onto insulating paper for the preparation of conductive paper. Subsequent Ni electroplating of the metal NP\u2010coated substrates reduces the sheet resistance from \u224810<jats:sup>3<\/jats:sup> to &lt;0.1 \u03a9\u00a0sq<jats:sup>\u22121<\/jats:sup> while maintaining the porous structure of the pristine paper. Particularly, this approach is completely compatible with commercial electroplating processes, and thus can be directly extended to electroplating applications using a variety of other metals in addition to Ni. After depositing high\u2010energy MnO NPs onto Ni\u2010electroplated papers, the areal capacitance increases from 68 to 811 mF\u00a0cm<jats:sup>\u22122<\/jats:sup> as the mass loading of MnO NPs increases from 0.16 to 4.31 mg\u00a0cm<jats:sup>\u22122<\/jats:sup>. When metal NPs are periodically LbL\u2010assembled with the MnO NPs, the areal capacitance increases to 1710 mF\u00a0cm<jats:sup>\u22122<\/jats:sup>.<\/jats:p>","DOI":"10.1002\/smll.202007579","type":"journal-article","created":{"date-parts":[[2021,3,18]],"date-time":"2021-03-18T11:02:50Z","timestamp":1616065370000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["A Layer\u2010by\u2010Layer Assembly Route to Electroplated Fibril\u2010Based 3D Porous Current Collectors for Energy Storage Devices"],"prefix":"10.1002","volume":"17","author":[{"given":"Seunghui","family":"Woo","sequence":"first","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Donghyeon","family":"Nam","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Woojae","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Younji","family":"Ko","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seokmin","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yongkwon","family":"Song","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biological Engineering Korea University  145 Anam\u2010ro, Seongbuk\u2010gu Seoul 02841 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bongjun","family":"Yeom","sequence":"additional","affiliation":[{"name":"Department of Chemical Engineering Hanyang University  222 Wangsimni\u2010ro, Seongdong\u2010gu Seoul 04763 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun Hyuk","family":"Moon","sequence":"additional","affiliation":[{"name":"Department of Chemical and Biomolecular Engineering Sogang University  Baekbeom\u2010ro 35, Mapo\u2010gu Seoul 04107 Republic of Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seung Woo","family":"Lee","sequence":"additional","affiliation":[{"name":"The George W. 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