{"title":"Self-Co-Electrolysis for Co-Production of Phosphate and Hydrogen in Neutral Phosphate Buffer Electrolyte","authors":"Heng Xu, Guanxing Xu, Lisong Chen, Jianlin Shi","doi":"10.1002/adma.202200058","DOIUrl":null,"url":null,"abstract":"<p>The spontaneous reaction between Zn and H<sub>2</sub>O is of critical importance and could plausibly be used to produce H<sub>2</sub> gas, especially under neutral conditions. However, this reaction has long been overlooked owing to its sluggish kinetics and Zn consumption. Herein, a unique self-co-electrolysis system (SCES) is reported, which uses a Zn anode, a CoP-based catalytic cathode, and a neutral phosphate buffer solution (PBS) as the electrolyte. In this SCES, Zn is not only a sacrificial anode but also an important precursor of high-value-added NaZnPO<sub>4</sub>. Additionally, the composition and phase structure of NaZnPO<sub>4</sub> can be well regulated. In this study, a high-performance N,Cu-CoP/carbon cloth (CC) catalyst is synthesized to catalyze the cathodic hydrogen evolution reaction (HER) at an especially low overpotential of 64.7 mV at 10 mA cm<sup>−</sup><sup>2</sup>. H<sub>2</sub> gas (13.7 mL cm<sup>−</sup><sup>2</sup> h<sup>−</sup><sup>1</sup>) and NaZnPO<sub>4</sub> (3.73 mg cm<sup>−</sup><sup>2</sup> h<sup>−</sup><sup>1</sup>) are obtained at the cathode and anode, respectively, in the N,Cu-CoP/CC||Zn SCES spontaneously. Moreover, the SCES has a favorable open-circuit voltage (OCV) of 0.79 V and a maximum power density of 1.83 mW cm<sup>−</sup><sup>2</sup>. Density functional theory (DFT) calculations are performed to elucidate the electronic structure and HER catalytic mechanism of the N and Cu co-doped CoP catalysts.</p>","PeriodicalId":114,"journal":{"name":"Advanced Materials","volume":null,"pages":null},"PeriodicalIF":27.4000,"publicationDate":"2022-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Materials","FirstCategoryId":"88","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/adma.202200058","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 8
Abstract
The spontaneous reaction between Zn and H2O is of critical importance and could plausibly be used to produce H2 gas, especially under neutral conditions. However, this reaction has long been overlooked owing to its sluggish kinetics and Zn consumption. Herein, a unique self-co-electrolysis system (SCES) is reported, which uses a Zn anode, a CoP-based catalytic cathode, and a neutral phosphate buffer solution (PBS) as the electrolyte. In this SCES, Zn is not only a sacrificial anode but also an important precursor of high-value-added NaZnPO4. Additionally, the composition and phase structure of NaZnPO4 can be well regulated. In this study, a high-performance N,Cu-CoP/carbon cloth (CC) catalyst is synthesized to catalyze the cathodic hydrogen evolution reaction (HER) at an especially low overpotential of 64.7 mV at 10 mA cm−2. H2 gas (13.7 mL cm−2 h−1) and NaZnPO4 (3.73 mg cm−2 h−1) are obtained at the cathode and anode, respectively, in the N,Cu-CoP/CC||Zn SCES spontaneously. Moreover, the SCES has a favorable open-circuit voltage (OCV) of 0.79 V and a maximum power density of 1.83 mW cm−2. Density functional theory (DFT) calculations are performed to elucidate the electronic structure and HER catalytic mechanism of the N and Cu co-doped CoP catalysts.
期刊介绍:
Advanced Materials, one of the world's most prestigious journals and the foundation of the Advanced portfolio, is the home of choice for best-in-class materials science for more than 30 years. Following this fast-growing and interdisciplinary field, we are considering and publishing the most important discoveries on any and all materials from materials scientists, chemists, physicists, engineers as well as health and life scientists and bringing you the latest results and trends in modern materials-related research every week.