MXene‐based materials for sodium‐ion storage. (a) Reproduced with permission.[83] Copyright 2018, American Chemical Society. (b) Reproduced with permission.[15] Copyright 2017, American Chemical Society. (c) Reproduced with permission.[81] Copyright 2017, American Chemical Society. (d) Reproduced with permission.[84] Copyright 2018, Royal Society of Chemistry. (e) Reproduced with permission.[88] Copyright 2018, WILEY‐VCH GmbH. (f) Reproduced with permission.[85] Copyright 2019, Elsevier B.V. (g) Reproduced with permission.[14] Copyright 2020, American Chemical Society. (h) Reproduced with permission.[94] Copyright 2017, WILEY‐VCH GmbH. (i) Reproduced with permission.[90] Copyright 2018, Royal Society of Chemistry. (j) Reproduced with permission.[105] Copyright 2020, Royal Society of Chemistry. (k) Reproduced with permission.[102] Copyright 2019, Royal Society of Chemistry. (l) Reproduced with permission.[110] Copyright 2019, Royal Society of Chemistry. (m) Reproduced with permission.[118] Copyright 2018, Elsevier B.V. (n) Reproduced with permission.[114] Copyright 2018, American Chemical Society. (o) Reproduced with permission.[121] Copyright 2019, WILEY‐VCH GmbH. (p) Reproduced with permission.[132] Copyright 2020, Royal Society of Chemistry. (q) Reproduced with permission.[130] Copyright 2018, Elsevier Ltd. (r) Reproduced with permission.[129] Copyright 2018, Royal Society of Chemistry.