发表机构
Indian Institute of Technology Roorkee; Banaras Hindu University（印度理工学院罗尔基分校; 贝拿勒斯印度教大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究比较四种粘结剂对CsPbBr3纳米晶电极电容性能的影响，发现界面平衡常数ξ_Int并非普适，而需根据粘结剂化学性质（含酸基团与否）取特定值，并揭示电化学过程中的相转化。
AI 中文摘要
先前关于无铅锡卤化物钙钛矿的研究表明，粘结剂反而决定了电容达到最大值时的电解质浓度，遵循关系式 $100 \times [\mathrm{Li}^+]_{\mathrm{opt}} + \mathrm{PVDF}_{\mathrm{wt}\\%} = \xi_{\mathrm{Int}}$，其中 $\xi_{\mathrm{Int}} = 25 \pm 2.5$，该关系通过改变单一聚合物的负载量而确立。$\xi_{\mathrm{Int}}$ 是普适的还是特定于该聚合物，尚未得到验证。本文在乙腈中四种LiTFSI浓度下，对CsPbBr$_3$纳米晶电极上跨越氟化（PVDF）、羧酸（PAA）、纤维素（CMC）和磺酸（PEDOT:PSS）化学性质的四种粘结剂进行了比较，粘结剂负载量固定为15 wt%，所有其他配方变量保持不变。该关系适用于CsPbBr$_3$：15 wt%的PVDF在0.10–0.15 M浓度下给出最佳性能，电容为112 F g$^{-1}$，而相同条件下CsSnCl$_3$的报道值为126 F g$^{-1}$，将结果扩展到了不同的B位阳离子、卤化物和晶体体系。PVDF和CMC在0.10 M时达到最佳，给出$\xi_{\mathrm{Int}} = 25$，而PAA和PEDOT:PSS在0.15 M时达到最佳，给出$\xi_{\mathrm{Int}} = 30$，PAA的最大值为188 F g$^{-1}$，PEDOT:PSS的最大值为146 mF cm$^{-2}$。显示偏移的两种粘结剂带有高密度的可电离酸基团，表明以重量百分比表示的$\xi_{\mathrm{Int}}$需要特定于粘结剂的值。在所有四种电极中，CsPbBr$_3$在电化学表征过程中转化为PbBr$_2$和CsBr，且PEDOT:PSS电极的表面铅含量降低。
英文摘要
Previous work on lead-free tin halide perovskites showed that the binder instead sets the electrolyte concentration at which capacitance is maximised, following the relationship $100 \times [\mathrm{Li}^+]_{\mathrm{opt}} + \mathrm{PVDF}_{\mathrm{wt}\%} = ξ_{\mathrm{Int}}$ with $ξ_{\mathrm{Int}} = 25 \pm 2.5$, established by varying the loading of a single polymer. Whether $ξ_{\mathrm{Int}}$ is universal or specific to that polymer has not been tested. Here, four binders spanning fluorinated (PVDF), carboxylic (PAA), cellulosic (CMC) and sulfonic (PEDOT:PSS) chemistry are compared on $\mathrm{CsPbBr_3}$ nanocrystal electrodes at four LiTFSI concentrations in acetonitrile, with binder loading fixed at 15 wt% and all other formulation variables held constant. The relationship applies to $\mathrm{CsPbBr_3}$: PVDF at 15 wt% gives an optimum at 0.10--0.15 M and 112 F g$^{-1}$, against 126 F g$^{-1}$ reported for $\mathrm{CsSnCl_3}$ under the same conditions, extending the result to a different B-site cation, halide and crystal system. PVDF and CMC optimise at 0.10 M, giving $ξ_{\mathrm{Int}} = 25$, while PAA and PEDOT:PSS optimise at 0.15 M, giving $ξ_{\mathrm{Int}} = 30$, with maximum values of 188 F g$^{-1}$ for PAA and 146 mF cm$^{-2}$ for PEDOT:PSS. The two binders showing the shift carry ionisable acid groups at high density, indicating that $ξ_{\mathrm{Int}}$ expressed in weight percent requires a binder-specific value. In all four electrodes, $\mathrm{CsPbBr_3}$ converts to $\mathrm{PbBr_2}$ and CsBr during electrochemical characterisation, and the surface lead content of the PEDOT:PSS electrode decreases.
