2021
DOI: 10.1002/er.7523
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Investigation of the potassium‐ion storage mechanism of nickel selenide materials and rational design of nickel selenide‐C yolk‐shell structure for enhancing electrochemical properties

Abstract: Metal selenide is contemplated as expeditious anode material for potassiumion batteries (KIBs). Here, nickel selenide (NiSe 2 -Ni 0.85 Se) was investigated as an anode material for KIBs. The NiSe x transformed into K 2 Se and K 2 Se 3 (K 2 Se x ) and reversibly returned to NiSe x after the discharge and charge processes (17NiSe 2 + 3Ni 0.85 Se + 38 K + + 38e À $ 19.55Ni + 10K 2 Se + 9K 2 Se 3 ). Furthermore, to enhance the electrochemical properties of nickel selenide, yolk-shell-structured nickel selenide and… Show more

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Cited by 10 publications
(6 citation statements)
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“…[19] The peaks at higher binding energy of 54.9 and 55.5 eV were assigned to the K 2 Se 3 phase. [37,38] This result demonstrated the existence of K-Se phase in the selenization process.…”
Section: Resultsmentioning
confidence: 63%
“…[19] The peaks at higher binding energy of 54.9 and 55.5 eV were assigned to the K 2 Se 3 phase. [37,38] This result demonstrated the existence of K-Se phase in the selenization process.…”
Section: Resultsmentioning
confidence: 63%
“…[42,43] The peaks at lower binding energies of 52.8 eV and 53.6 eV were assigned to the K 2 Se 3 phase, confirming the presence of the K─Se phase. [44] Figure 4h,i shows the XPS spectra of the Se Auger-K 2p region. For the K 2 S film, a shoulder peak on the Se Auger peak is observed at the low binding energy (292.6 and 249.8 eV) side, which is attributed to the K 2p response.…”
Section: Resultsmentioning
confidence: 99%
“…After the selenization temperature reaches 375 °C, the liquid K 2 Se 3 phase flows between grain boundary (Figure 5i), lowering the melting point and leading to rapid crystallization at lower temperatures. [44] Moreover, the flow of K 2 Se 3 liquid phase is accompanied by the supply of Se. Placing the K 2 S layer in the middle of the CZTSSe film facilitates the downward diffusion of the generated K 2 Se 3 to the rest of the film, which is the key reason why the film is able to form two layers of microcrystals when selenization time is 600 s. Meanwhile, the Cu 2 Se liquid phase also plays an obvious role in accelerating the crystallization process, and Cu 2 Se is usually formed in the preselenization period, Cu 2 S + Se → Cu 2 Se + S (g) this reaction occurs at 275 °C, but the presence of the Cu 2 Se phase can be detected at 225 °C when the film contains alkali metals, so we believe that this is another reason for the dominance of the K 2 S sample in the grain growth process.…”
Section: Resultsmentioning
confidence: 99%
“…[20][21][22][23][24] To date, various types of anode candidates have been developed and reported, which can be roughly divided into three categories according to the various energy storage mechanism, including an intercalationtype anode with a large interlayer spacing for K + insertion/ extraction (e.g., hard carbon, 25,26 graphite, 27 TiO 2 , 28 K 2 Ti 4 O 9 , 29 layered transition metal chalcogenides, [30][31][32] etc. ), a conversiontype anode with a reversible phase transition process and huge volume change (e.g., Co 3 O 4 , 33 Fe 2 O 3 , 34 CoS, 35 NiSe 2 , 36 FeSe 2 , 37 SnS 2 , 38 etc. ), and an alloying-type anode with a high specific capacity and more severe volume change than conversiontype 39 (e.g., Bi, 40 Sb, 41,42 P, 43 Sn, 44 etc.).…”
Section: Vs She)]mentioning
confidence: 99%
“…), a conversion-type anode with a reversible phase transition process and huge volume change ( e.g. , Co 3 O 4 , 33 Fe 2 O 3 , 34 CoS, 35 NiSe 2 , 36 FeSe 2 , 37 SnS 2 , 38 etc. ), and an alloying-type anode with a high specific capacity and more severe volume change than conversion-type 39 ( e.g.…”
Section: Introductionmentioning
confidence: 99%