Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.328
Publication date: 7th February 2022
Colloidal heterostructure nanocrystals (NCs) exhibit enhanced physical and electronic properties due to the synergistic effect of chemically distinguished domains.[1], [2] Among them, multi-pods are more active in electrochemical processes than core-shell structures accredited to the more accessible core with adequate shielding from electrochemical reaction-related adverse structural deformations.3 However, the synthesis and development of colloidal multipods lack a direct growth approach. Here, we synthesize colloidal Bi-Cu2-xS multipods, and single pod NCs in a solution-liquid-solid (SLS) growth of Cu2-xS on insitu formed Bi NCs (Figure 1). We reveal that controlling the state (liquid or solid) of Bi seed and influx rate of Cu+ cations can alter the number of pods formation during hetero-nucleation of Bi seeded Cu2-xS heterostructures. The ex-situ mechanistic investigation of the growth process reveals that the equivalent amount of diphosphonic acid (DPA) stabilizes the Cu-thiolate complex, thus lowering the free Cu+ concentration and increasing the induction time. Therefore, Bi NCs transition into solid faceted NCs, forming a single Cu2-xS pod. In contrast, a low DPA (0 to 0.5 mmol) concentration cannot stabilize the Cu-thiolate complex, resulting in high free Cu+ concentration and multipods of Cu2-xS on Bi. Furthermore, we studied the electrochemical performance of Bi-Cu2-xS as anode material for potassium ion batteries.
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