journal article·2020-01-10

Rational Design of 2D Manganese Phosphate Hydrate Nanosheets as Pseudocapacitive Electrodes

Kumar Raju, Hyungkyu Han, Dhinesh Babu Velusamy, Qiu Jiang, Huachao Yang, Funeka P. Nkosi, Nithyadharseni Palaniyandy, Katlego Makgopa, Zheng Bo, Kenneth I. Ozoemena

ACS Energy Letters· Volume 5· Issue 1
Publisher page

Abstract

A new class of 2D nanosheets of nitrogen-integrated phosphate-rich ammonium manganese phosphate hydrate, (NH4MnPO4·H2O) (AMP), has been developed as pseudocapacitive electrode materials. The optimized electrodes exhibited device capacitances of 48.4 and 65.4 F/g for symmetric and asymmetric configurations, respectively. The devices showed excellent energy and power (e.g., 29.4 Wh/kg and 133 kW/kg for asymmetric cells) with extraordinary capacitance retention (e.g., >93%, 100 000 cycles at 5 A/g for asymmetric cells) that surpass those of most of the reported values. The huge pseudocapacitance of AMP is attributed to several factors, including the electroactive sites containing NH4+ ions, the conductive inorganic layers, intercalated water interactions of Mn2+···H2O, redox-active phosphate ions, and the 2D nanosheets. AMP-based all-solid-state flexible asymmetric devices exhibited >95% capacitance retention upon 1000 repetitive charge–discharge cycles. This study opens doors to elegant strategies of unlocking the rich physicoelectrochemical properties of 2D AMP for next-generation pseudocapacitors.
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Research context

OpenAlex topics: Supercapacitor Materials and Fabrication · Advanced battery technologies research · MXene and MAX Phase Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Energy Centre, Council for Scientific and Industrial Research (CSIR), Pretoria 0001, South Africa

Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States

Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Kingdom of Saudi Arabia

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, Zhejiang 310027, China

Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden

Department of Chemistry, Tshwane University of Technology, Pretoria 0001, South Africa

Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg 2050, South Africa

Funding

University of the Witwatersrand, Johannesburg · National Research Foundation · Council for Scientific and Industrial Research

References (39)

Show source-provided references
1. 10.1038/ncomms1264710.1038/ncomms12647 ↗
2. 10.1038/nature1147510.1038/nature11475 ↗
3. 10.1039/C4CS00266K10.1039/C4CS00266K ↗
4. 10.1126/science.121300310.1126/science.1213003 ↗
5. 10.1038/nmat229710.1038/nmat2297 ↗
6. 10.1002/aenm.20170263010.1002/aenm.201702630 ↗
7. 10.1038/s41467-018-03700-310.1038/s41467-018-03700-3 ↗
8. 10.1038/s41560-017-0044-510.1038/s41560-017-0044-5 ↗
9. 10.1038/s41578-018-0069-910.1038/s41578-018-0069-9 ↗
10. 10.1021/acsenergylett.8b0071810.1021/acsenergylett.8b00718 ↗
11. 10.1021/acsenergylett.9b0098310.1021/acsenergylett.9b00983 ↗
12. 10.1038/ncomms343110.1038/ncomms3431 ↗
13. 10.1039/C3EE43979H10.1039/C3EE43979H ↗
14. 10.1016/j.nanoen.2017.03.04510.1016/j.nanoen.2017.03.045 ↗
15. 10.1038/nmat261210.1038/nmat2612 ↗
16. 10.1126/science.120077010.1126/science.1200770 ↗
17. 10.1039/C8CS00561C10.1039/C8CS00561C ↗
18. 10.1038/nenergy.2017.10510.1038/nenergy.2017.105 ↗
19. 10.1021/acs.accounts.7b0048110.1021/acs.accounts.7b00481 ↗
20. 10.1002/smll.20170153010.1002/smll.201701530 ↗
21. 10.1038/srep1762910.1038/srep17629 ↗
22. 10.1038/nmat476610.1038/nmat4766 ↗
23. 10.1016/j.electacta.2018.04.00510.1016/j.electacta.2018.04.005 ↗
24. 10.1039/C3RA45977B10.1039/C3RA45977B ↗
25. 10.1126/science.119497510.1126/science.1194975 ↗
26. 10.1016/j.jpcs.2008.12.01610.1016/j.jpcs.2008.12.016 ↗
27. 10.1021/ic00119a01310.1021/ic00119a013 ↗
28. 10.1039/C3CE42501K10.1039/C3CE42501K ↗
29. 10.1016/j.jcrysgro.2010.09.00510.1016/j.jcrysgro.2010.09.005 ↗
30. 10.1039/C6RA02217K10.1039/C6RA02217K ↗
31. 10.1038/nnano.2010.16210.1038/nnano.2010.162 ↗
32. 10.1021/acs.cgd.7b0081610.1021/acs.cgd.7b00816 ↗
33. 10.1021/ic030052010.1021/ic0300520 ↗
34. 10.1021/acs.inorgchem.6b0194210.1021/acs.inorgchem.6b01942 ↗
35. 10.1002/aenm.20170304310.1002/aenm.201703043 ↗
36. 10.1039/C8CP05384G10.1039/C8CP05384G ↗
37. 10.1039/C6EE03773A10.1039/C6EE03773A ↗
38. 10.1016/j.carbon.2017.02.05010.1016/j.carbon.2017.02.050 ↗
39. 10.1002/smll.20130293710.1002/smll.201302937 ↗