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Nanoparticles, by contrast, offer superior stability but suffer from poor dispersibility in base oils, a critical bottleneck that restricts their application in tribological contacts. Intermediate in size between small-molecule additives and nanoparticles, polyoxometalates (POMs) possess high stability. Herein, we report the synthesis of oil-dispersible POM-based composites via the acid-base reaction between sulfur-free or elemental-sulfur-derived polyisobutylene monosuccinimide and phosphomolybdic acid (PMA) or phosphotungstic acid (PTA). The resulting composites form stable micellar aggregates in oil, with the polyisobutylene corona encapsulating the POMs and ensuring long-term colloidal stability. SRV-IV oscillating reciprocating tribological evaluation reveals that the sulfur-derived POM composites exhibit excellent friction-reduction and antiwear properties, with load-bearing capacity exceeding 1200 N. This superior lubrication performance arises from the formation of nanoscale protective tribofilms that comprise in-situ-generated MoS2 or WS2. The present supramolecular platform, combining POMs with sulfur-derived and oil-compatible polymers, enables systematic development of high-performance lubricant additives via interfacial tribochemistry.<\/jats:p>","DOI":"10.1021\/acsami.6c15827","type":"journal-article","created":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T16:01:31Z","timestamp":1790438491000},"page":"54075-54085","source":"Crossref","is-referenced-by-count":0,"title":["Polyoxometalate-Based Composites as High-Performance Lubricant Additives for Friction and Wear Reduction"],"prefix":"10.1021","volume":"18","author":[{"given":"Qi","family":"Pei","sequence":"first","affiliation":[{"name":"Lanzhou University , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qing","family":"Huang","sequence":"additional","affiliation":[{"name":"PetroChina Lanzhou Lubricating Oil R & D Institute , ,","place":["Lanzhou, China, 730060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Haozhe","family":"Xu","sequence":"additional","affiliation":[{"name":"Lanzhou University , , ,","place":["Lanzhou, China, 730000"]},{"name":"Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lili","family":"Jin","sequence":"additional","affiliation":[{"name":"PetroChina Lanzhou Lubricating Oil R & D Institute , ,","place":["Lanzhou, China, 730060"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qun","family":"He","sequence":"additional","affiliation":[{"name":"Lanzhou University , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2190-5541","authenticated-orcid":true,"given":"Meirong","family":"Cai","sequence":"additional","affiliation":[{"name":"Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7136-9233","authenticated-orcid":true,"given":"Feng","family":"Zhou","sequence":"additional","affiliation":[{"name":"Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6213-2928","authenticated-orcid":true,"given":"Weifeng","family":"Bu","sequence":"additional","affiliation":[{"name":"Lanzhou University , , ,","place":["Lanzhou, China, 730000"]},{"name":"Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , , ,","place":["Lanzhou, China, 730000"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,26]]},"reference":[{"issue":"3","key":"2026100708065907000_cit1","doi-asserted-by":"publisher","first-page":"263","DOI":"10.1007\/s40544-017-0183-5","article-title":"Influence of Tribology on Global Energy Consumption, Costs and Emissions","volume":"5","author":"Holmberg","year":"2017","journal-title":"Friction"},{"issue":"6","key":"2026100708065907000_cit2","doi-asserted-by":"publisher","first-page":"839","DOI":"10.1007\/s40544-022-0639-0","article-title":"The Mechanisms and Applications of Friction Energy Dissipation","volume":"11","author":"Liu","year":"2023","journal-title":"Friction"},{"issue":"3","key":"2026100708065907000_cit3","doi-asserted-by":"publisher","first-page":"469","DOI":"10.1023\/B:TRIL.0000044495.26882.b5","article-title":"The History and Mechanisms of ZDDP","volume":"17","author":"Spikes","year":"2004","journal-title":"Tribol. 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