当前位置:首页>南京>『水系锌碘』南京工业大学 Energy Environ. Sci.:πₛₚ₋ₚ键诱导碘化锌 sp 杂化活化,实现安时级柔性海水锌碘软包电池

『水系锌碘』南京工业大学 Energy Environ. Sci.:πₛₚ₋ₚ键诱导碘化锌 sp 杂化活化,实现安时级柔性海水锌碘软包电池

  • 2026-05-09 15:23:11
『水系锌碘』南京工业大学 Energy Environ. Sci.:πₛₚ₋ₚ键诱导碘化锌 sp 杂化活化,实现安时级柔性海水锌碘软包电池
【背景挑战】
海水基锌碘电池直接使用天然海水作电解液,资源无限、成本极低、安全性高,是海洋储能、深海探测、可穿戴设备的理想电源。但海水环境带来三大致命瓶颈:1)锌负极被海水中大量 Cl⁻Na⁺Mg²⁺等离子严重腐蚀,同时伴随剧烈析氢副反应,枝晶快速生长;2)碘正极充放电生成可溶性多碘离子(I₃⁻I₅⁻),发生严重穿梭效应,腐蚀负极、容量暴跌;3)最终放电产物 ZnI₂动力学极差、易团聚绝缘,导致反应停滞、电池快速失效。传统策略只能单一抑制腐蚀或缓解穿梭,无法同时解决负极不稳定、正极穿梭、ZnI₂钝化三大耦合难题,安时级大容量海水电池难以实用化。
【文献导入】
常规催化与界面修饰无法激活 ZnI₂本征反应活性。本研究首创 πₛₚ₋ₚ轨道耦合催化策略,引入 1,3 - 二氧六环(1,3-DX)作为多功能调节剂:在负极:1,3-DX 优先吸附锌表面,构筑疏水保护层,排斥 Cl⁻与自由水,抑制腐蚀、析氢与枝晶;在正极:1,3-DX  O 原子 p 轨道与 ZnI₂ sp 杂化轨道重叠,形成 πₛₚ₋ₚ配位键,激活惰性 ZnI₂,加速碘可逆转化,彻底抑制多碘离子穿梭。该策略实现负极防护与正极活化双协同,柔性电池25000 圈超长循环,安时级软包(1.01 Ah)稳定循环 100 圈,0~25 ℃宽温域稳定工作,真正实现海水电池实用化。
【创新点】
机制原创:首次提出 πₛₚ₋ₚ轨道耦合新机制,激活惰性 ZnI₂,从根源解决正极动力学钝化难题;
双效协同:一个分子同时实现锌负极抗腐蚀、抗枝晶 + 碘正极加速转化、抑穿梭,一体化解决海水电池痛点;
实用突破:实现 25000 圈超长寿、1.01 Ah 安时级软包、柔性可穿戴、宽温域工作,性能领跑海水锌碘电池。
【图文详解】
 1:海水锌碘电池应用场景与核心失效机制
A)海洋储能与可穿戴应用场景;B) 电解液成本对比;C) 地球水资源分布;D) 海水电池失效与本工作调控示意图。
清晰揭示海水电池天然困境:
海水免费、储量无限,电解液成本几乎为零,远优于去离子水体系;
天然失效:Cl⁻腐蚀锌负极、多碘离子穿梭、ZnI₂钝化绝缘,三大问题同时爆发;
本工作方案:1,3-DX 分子同时护负极、活正极、抑穿梭,一步到位。
 2:电解液氢键调控与负极界面优化
A)拉曼 O–H 分峰;B) 强弱氢键比例;C) 电解液接触角;D-E) 原位光学观测锌沉积。
实验证实负极防护机制:
氢键重构:1,3-DX 增强强氢键比例,降低自由水活性,抑制析氢;
疏水防护:接触角从 76.0° 升至 104.8°,有效阻挡 Cl⁻与水接触锌表面;
均匀沉积:1,3-DX 诱导 Zn (002) 择优生长,全程平整致密、无枝晶、无腐蚀坑。
 3:锌负极电化学稳定性与界面动力学
(A) 不同反应阶段负极表面锌离子浓度梯度示意图;(B) 不同 1,3‑DX 含量的锌对称电池 LSV 曲线;(C, D) 对应电势与扩散电流;(E) 奈奎斯特阻抗图;(F) 析氢 LSV 曲线;(G) 塔菲尔腐蚀曲线;(H) SECM 表征示意图;(I, G) 1,3‑DX 0 与 1,3‑DX 6 体系的反应电流等势图。
全面验证负极超强稳定性:
析氢显著抑制:析氢起始电位负移 62 mV,副反应被大幅压制;
抗腐蚀提升:腐蚀电流显著降低,锌负极界面更稳定;
界面均匀:SECM 显示反应电流平稳,无局部热点,无腐蚀与枝晶。
 4:锌碘电池全电池与软包超高性能
A) CV 曲线;B-C) Tafel 斜率;D) 倍率性能;E) 10 mA cm⁻² 长循环;F) 25000 圈超长寿;G) 性能对比图;H-I) 1.01 Ah  0.41 Ah 安时级软包;J) 与文献对比;K-L) 循环后电极形貌。
展示颠覆性实用化性能:
超低极化:氧化还原峰差更小,Tafel 斜率更低,动力学极速提升;
超长寿:10 mA cm⁻² 25000 圈保持 77%,平均库仑效率接近 100%
软包突破:1.01 Ah 大容量软包循环 100 圈保持 90%0.41 Ah 软包稳定 2700 圈;
形貌完美:循环后锌负极平整、碘正极产物均匀,无穿梭无腐蚀。
 5πₛₚ₋ₚ轨道耦合激活 ZnI₂机制
A-C) COHP 键强度计算;D-F) 态密度 DOSG) 轨道能级与耦合示意图;H)πₛₚ₋ₚ共轭网络;I-N) RDG 非共价相互作用。
原子级阐明激活原理:
 ZnI Zn  sp 杂化,原本惰性难以反应;
 1,3-DX  O (p 轨道) ↔ ZnI₂(sp 杂化轨道形成πₛₚ₋ₚ键;
电子重新排布,Zn–I 键活化,反应能垒大幅降低;
形成共轭网络,快速传递电子与离子,彻底激活 ZnI₂
 6:原位表征证实多碘离子穿梭被抑制
A-B)原位拉曼;C) 对称电池 CVD-E) Tafel 斜率;F) 峰电位;G) 峰电流;H-I) XPS 碘与氧谱图。
直接观测正极调控效果:
原位拉曼:I₃⁻I₅⁻信号被显著压制,几乎无可溶性多碘离子;
原位紫外:电解液中无碘离子溶解,穿梭效应完全消失;
 XPS:出现 (1,3-DX)–I 键信号,直接证明 πₛₚ₋ₚ配位作用存在。
 7:柔性、耐弯折、宽温域可穿戴性能
A)可穿戴与海洋设备应用;B) 机械破坏下循环;C) 变温循环;D) 不同弯折角度;E-H) 关节动态弯折测试。
验证超强环境适应性:
耐机械破坏:切割、弯折仍稳定工作,容量保持 90%
宽温域:0~25 稳定循环,低温容量保持率优异;
可穿戴:模拟关节反复弯折,电压与容量无明显衰减;
普适性:同样适用于海水 Zn–MnO₂电池,性能大幅提升。
【结论总结】
本研究开创πₛₚ₋ₚ轨道耦合全新策略,利用 1,3-DX 分子实现海水锌碘电池正负极一体化协同调控:1)负极保护:疏水界面排斥 Cl⁻与水,抑制腐蚀、析氢、枝晶,锌负极超稳定;2)正极活化:轨道与 ZnI₂ sp 杂化轨道耦合,形成 πₛₚ₋ₚ键,彻底激活惰性 ZnI₂,加速碘转化;3)穿梭抑制:锚定多碘离子,避免溶解迁移,杜绝负极腐蚀与容量衰减。最终实现25000 圈超长循环、1.01 Ah 安时级软包、柔性可穿戴、宽温域稳定,为海洋储能、深海装备、柔性电子提供低成本、高安全、长寿命全新电源方案。
【文献速递】
Activating sp Hybridization of Zinc Iodide via πₛₚ₋ₚ Bonding Donation Enables Ah-Level Seawater-based Wearable Zinc-Iodine Pouch Cells.Energy & Environmental Science, 2026; https://doi.org/10.1039/D6EE00836D
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  1. CONNECT:[ UseTime:0.000565s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000723s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000286s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000533s ]
  6. SELECT * FROM `set` [ RunTime:0.000365s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000710s ]
  8. SELECT * FROM `article` WHERE `id` = 545537 LIMIT 1 [ RunTime:0.000491s ]
  9. UPDATE `article` SET `lasttime` = 1779010929 WHERE `id` = 545537 [ RunTime:0.000645s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 545537 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000416s ]
  12. SELECT * FROM `article` WHERE `id` > 545537 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000396s ]
  13. SELECT * FROM `article` WHERE `id` < 545537 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001414s ]
  14. SELECT * FROM `article` WHERE `id` < 545537 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001299s ]
  15. SELECT * FROM `article` WHERE `id` < 545537 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000958s ]
0.101020s