标题: Rechargeable Zn-H₂O hydrolysis battery for hydrogen storage and production

作者: Cai, MY (Cai, Muya); Shi, H (Shi, Hao); Zhang, Y (Zhang, Yu); Qu, JK (Qu, Jiakang); Wang, HY (Wang, Hongya); Guo, YY (Guo, Yanyang); Du, KF (Du, Kaifa); Li, W (Li, Wei); Deng, BW (Deng, Bowen); Wang, DH (Wang, Dihua); Yin, HY (Yin, Huayi)

来源出版物: ANGEWANDTE CHEMIE-INTERNATIONAL EDITION 卷: 63 期: 26 DOI: 10.1002/anie.202404025 Early Access Date: MAY 2024 Published Date: 2024 JUN 21

摘要: Reactive metals hydrolysis offers significant advantages for hydrogen storage and production. However, the regeneration of common reactive metals (e.g., Mg, Al, etc.) is energy-intensive and produces unwanted byproducts such as CO2 and Cl-2. Herein, we employ Zn as a reactive mediator that can be easily regenerated by electrolysis of ZnO in an alkaline solution with a Faradaic efficiency of >99.9 %. H-2 is produced in the same electrolyte by constructing a Zn-H2O hydrolysis battery consisting of a Zn anode and a Raney-Ni cathode to unlock the Zn-H2O reaction. The entire two-step water splitting reaction with a net energy efficiency of 70.4 % at 80 degrees C and 50 mA cm(-2). Additionally, the Zn-H2O system can be charged using renewable energy to produce H-2 on demand and runs for 600 cycles only sacrificing 3.76 % energy efficiency. DFT calculations reveal that the desorption of H* on Raney-Ni (-0.30 eV) is closer to zero compared with that on Zn (-0.87 eV), indicating a faster desorption of H* at low overpotential. Further, a 24 Ah electrolyzer is demonstrated to produce H-2 with a net energy efficiency of 65.5 %, which holds promise for its real application.

作者关键词: hydrolysis reaction; Zn-H2O battery; hydrogen storage; decoupled water splitting

地址: [Cai, Muya; Shi, Hao; Zhang, Yu; Qu, Jiakang; Wang, Hongya; Guo, Yanyang; Du, Kaifa; Li, Wei; Deng, Bowen; Wang, Dihua; Yin, Huayi] Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

[Cai, Muya; Shi, Hao; Zhang, Yu; Qu, Jiakang; Wang, Hongya; Guo, Yanyang; Du, Kaifa; Li, Wei; Deng, Bowen; Wang, Dihua; Yin, Huayi] Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources &, Wuhan 430072, Peoples R China.

[Wang, Dihua; Yin, Huayi] Wuhan Univ, State Key Lab Water Resources Hydropower Engn Sci, Wuhan 430072, Peoples R China.

[Wang, Dihua; Yin, Huayi] Hubei Prov Key Lab Biomass Resource Chem & Environ, Wuhan 430072, Peoples R China.

通讯作者地址: Yin, HY (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, 299 Bayi Rd, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Wuhan Univ, Int Cooperat Base Sustainable Utilizat Resources &, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Wuhan Univ, State Key Lab Water Resources Hydropower Engn Sci, Wuhan 430072, Peoples R China.

Yin, HY (通讯作者)，Hubei Prov Key Lab Biomass Resource Chem & Environ, Wuhan 430072, Peoples R China.

电子邮件地址: yinhuayi@whu.edu.cn

影响因子：16.1