Batteries-Basel
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2023
·Vol. 9
·期 5
·241
·
IF 4
Da Lei,Yuyang Gao,Zhidong Hou,Lingbo Ren,Mingwei Jiang,Yunjing Cao,Yu Zhang,Jian-Gan Wang
Owing to the unique virtues of specific energy/power densities, lithium-ion capacitors (LICs) have been increasingly attracting research attention. However, the LICs are greatly restrained by the slow Li+-reaction kinetics of battery-type anodes, which is still a challenging task. In this work, we construct a superior LIC using ultrafine MnO/dual N-doped carbon (MnO/DNC) anode and activated N-doped porous carbon (ANC) derived from a homologous polypyrrole precursor. The uniform MnO ultrafine particles (~10 nm size) are well encapsulated into a dual-carbon framework, which provides fast ion/electron transportation and structural cushion for high-rate and long-durable energy storage. Accordingly, the anodic MnO/DNC achieves an impressive rate performance (179 mAh g−1@10 A g−1) and a stable 500-cycling lifespan. The as-constructed LICs could deliver a large specific energy of 172 Wh kg−1at 200 W kg−1and retain at 37 Wh kg−1even at a high specific power of 15 kW kg−1. It is believed that the design strategy of confining ultrafine conversion-type anode materials into a dual-carbon structure will expedite the development of advanced LICs.Keywords:lithium-ion capacitor;MnO;dual-carbon structure;reaction kinetics
研究领域:
能源存储
·
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2021
·
IF 6.583
Xiaobo Chen,Wei Wang,Xin Pan,Chengqun Qiu
Hierarchical core-shell nanowire arrays with a shell of CuCo 2 O 4 nanosheets and a core of MnCo 2 O 4 nanowires directly coated on the conductive carbon cloth (CC) are rationally designed and synthesized via a facile hydrothermal route with a post low-temperature thermal treatment in air. The binder-free MnCo 2 O 4 @CuCo 2 O 4 /CC composite material exhibits an enhanced performance (1241.0 C g −1 at 1 A g −1 ) compared with the MnCo 2 O 4 /CC (832.7 C g −1 at 1 A g −1 ) and CuCo 2 O 4 /CC (734.1 C g −1 at 1 A g −1 ). In addition, the MnCo 2 O 4 @CuCo 2 O 4 /CC electrode is assembled into a flexible all-solid-state asymmetric supercapacitor (ASC), which delivers a maximum specific energy of 62.0 Wh kg −1 at a specific power of 747.2 W kg −1 with 91.2% capacity retention after 10000 charge–discharge cycles at 8 A g −1 . And the ASC device also exhibits 91.7% capacity retention at floating time over 200 h at 8 A g −1 . Further, the MnCo 2 O 4 @CuCo 2 O 4 //AC device shows superior flexible performance while bending at various angles. These results make this MnCo 2 O 4 @CuCo 2 O 4 core/shell composite to be a good candidate for flexible all-solid-state electrochemical capacitors applications.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Huang Zhongliang,Hu Shengnan,Sun Mingzi,Xu Yong,Liu Shangheng,Ren Renjie,Zhuang Lin,Chan Ting-Shan,Hu Zhiwei,Ding Tianyi,Zhou Jing,Liu Liangbin,Wang Mingmin,Huang Yu-Cheng,Tian Na,Bu Lingzheng,Huang Bolong,Huang Xiaoqing
Bimetallic PtRu are promising electrocatalysts for hydrogen oxidation reaction in anion exchange membrane fuel cell, where the activity and stability are still unsatisfying. Here, PtRu nanowires were implanted with a series of oxophilic metal atoms (named as i-M-PR), significantly enhancing alkaline hydrogen oxidation reaction (HOR) activity and stability. With the dual doping of In and Zn atoms, the i-ZnIn-PR/C shows mass activity of 10.2 A mg Pt+Ru −1 at 50 mV, largely surpassing that of commercial Pt/C (0.27 A mg Pt −1 ) and PtRu/C (1.24 A mg Pt+Ru −1 ). More importantly, the peak power density and specific power density are as high as 1.84 W cm −2 and 18.4 W mg Pt+Ru −1 with a low loading (0.1 mg cm −2 ) anion exchange membrane fuel cell. Advanced experimental characterizations and theoretical calculations collectively suggest that dual doping with In and Zn atoms optimizes the binding strengths of intermediates and promotes CO oxidation, enhancing the HOR performances. This work deepens the understanding of developing novel alloy catalysts, which will attract immediate interest in materials, chemistry, energy and beyond.
研究领域:
材料科学
·
化学
·
能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SOLID STATE IONICS
·
2020
·
IF 3.107
Jian Liu,Ying-Ge Xu,Ling-Bin Kong
Sodium-ion batteries (SIBs) and Sodium-ion capacitors (SICs) have great promise for large-scale energy storage. However, the mismatch of electrode kinetics and charge-storage capacity between anode and cathode materials remains a challenge. Here three-dimensional self-assembled MoS 2 /SnS 2 -reduced graphene oxide (MoS 2 /SnS 2 -RGO) anode material with fast Na-ion diffusion rate and pseudocapacitive charge storage has been successfully prepared via a facile hydrothermal method . With this particular structure, the Na-ion diffusion coefficient of MoS 2 /SnS 2 -RGO calculated by GITT achieves 5.53 × 10 −7 cm 2 s −1 during the desodiation process, which effectively improves the reaction kinetics for anode material. When tested against metal sodium in the potential window of 0.01–3.00 V, the optimized MoS 2 /SnS 2 -RGO delivers an excellent reversible capacity of 818.9 mA h g −1 at a specific current of 100 mA g −1 after 100 cycles and a superior rate capability of 555.4 mA h g −1 at 2000 mA g −1 over 500 cycles. So far, MoS 2 /SnS 2 -RGO possesses the highest reversible capacity among the reported anode materials . Furthermore, a SIC composed of optimized MoS 2 /SnS 2 -RGO anode and a CC cathode reaches a high specific energy of 113.9 W h kg −1 at specific power of 561.25 W kg −1 . Similarly, a SIB consisted of the MoS 2 /SnS 2 -RGO anode and a Na 3 V 2 (PO 4 ) 3 /C cathode displays the reversible discharge capacity of 56 mA h g −1 at the high rates of 2 C.
研究领域:
材料科学
·
能源存储
·
电化学
✓ 已验证
DOI
高影响因子
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