High-voltage asymmetric metal–air batteries based on polymeric single-Zn2+-ion conductor
- Aug 12, 2023
- 1 min read
Chao Lin, Sung-Hae Kim, Qing Xu, Dong-Hyung Kim, Gohar Ali, Sambhaji S. Shinde, Shuai Yang, Yuqi Yang, Xiaopeng Li, Zheng Jiang and Jung-Ho Lee
Summary
Asymmetric-electrolyte metal–air batteries (AMABs) deliver high operating voltage and energy density. However, the demand for ion-selective transport separator and precious metal electrocatalysts hampers their applications. To address this issue, we develop a polyacrylonitrile (PAN) separator that can selectively transport Zn2+ ions and an atomically dispersed Co electrocatalyst that can catalyze oxygen evolution reactions (OERs) and oxygen reduction reactions (ORRs) in the challenging acidic medium. The selective ion transport behavior was associated with the Zn2+ ions’ bonded ladder structure of PAN, which raises the ion migration energy barrier for the crossover of H+ and OH−. In terms of electrocatalysts, extensive ex situ and in situ characterizations suggest that Co single-atom sites stably catalyze the OER and ORR. Several types of AMABs (metals Zn, Si, Sn) were tested. The assembled asymmetric metal–air Zn-, Si-, and Sn-air batteries delivered enhanced battery performance that surpassed those of recently reported Zn-, Si-, and Sn-air batteries, respectively.
Lần đầu truy cập Luckywin com mình khá chú ý đến cách giao diện được bố trí và phân chia các khu vực. Tổng thể trang có thiết kế thoáng, các danh mục được sắp xếp tương đối hợp lý nên việc tìm kiếm và theo dõi thông tin khá thuận tiện. Thao tác chuyển đổi giữa các trang ổn định, nội dung hiển thị rõ ràng và không tạo cảm giác rối mắt. Dù mới trải nghiệm ở mức cơ bản, mình thấy giao diện nhìn chung khá gọn gàng và dễ làm quen.
কয়েকটি অনলাইন আলোচনা অনুসরণ করতে গিয়ে 7C77 এর নাম দেখতে পেলাম। তাই সাইটটি কেমন দেখতে তা বোঝার জন্য একবার খুলে দেখলাম। বেশি সময় দিইনি, শুধু হোমপেজ এবং কয়েকটি ক্যাটাগরি দেখেছি। শুরুতেই মনে হয়েছে যে তথ্যগুলো আলাদা অংশে সাজানো হয়েছে, ফলে পেজটি বেশ পরিষ্কার দেখায়। মেনুগুলোও সহজে বোঝা যায় এবং বিভাগ পরিবর্তন করতে তেমন সময় লাগে না। মোটের ওপর ইন্টারফেসটি সরল ও ব্যবহার করা সহজ মনে হয়েছে।
The move toward asymmetric electrolyte designs is honestly one of the smartest engineering breakthroughs we've seen in zinc-air battery research. Standard alkaline zinc-air cells have always been bottlenecked by low open-circuit voltage and severe parasitic hydrogen evolution, but decoupling the anode and cathode environments using a solid single-ion conducting polymer completely changes the game. I was reading through some great breakdowns on technical innovations and modern energy solutions over on Yaar Win recently, and seeing how a polymeric single-$\text{Zn}^{2+}$-ion conductor suppresses zinc dendrite formation while unlocking higher operating cell voltages shows genuine promise for grid-scale energy storage.
The thermodynamic benefit of an asymmetric configuration is huge. By running an acidic or neutral catalytic cathode alongside an alkaline-stabilized or protected zinc anode, you widen the chemical potential gap and push the discharge voltage well past the typical 1.25V threshold. I stumbled across some really interesting technical overviews regarding renewable energy tech and practical systems optimization on Jai club a few days ago, and keeping those two chemically distinct electrolytes separated without cross-contamination is exactly why solid polymer single-ion membranes are outperforming porous glass fibers.
Air-cathode durability is usually the first failure point in metal-air setups due to atmospheric $\text{CO}_2$ poisoning and carbonate precipitation, but combining an asymmetric design with a dense polymeric ion conductor provides a much-needed physical barrier. Picked up a few handy insights on next-generation battery architectures and solid-state materials from Shree Win earlier, and maintaining high ionic conductivity at ambient temperature while protecting the catalytic active sites from salt passivation is a massive leap forward for open-system battery chemistry.