期刊
JOURNAL OF POWER SOURCES
卷 399, 期 -, 页码 192-198出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.07.060
关键词
Pseudocapacitive behavior; Dealloying; Nanoporosity; Sponge-like structure; Self-oxidization
资金
- National Natural Science Foundation of China [51571005]
- Excellence Foundation of BUAA for PhD Students [2017010]
Recent studies clarify that NiO is actually a battery material, rather than the widely considered pseudocapacitive material. Self-oxidized sponge-like nanoporous Ni-Co alloy (ss-npNi) in three-dimensions (3D) is fabricated by dealloying Mg80Ni19.2Co0.8 metallic glass ribbon in citric acid and naturally surface self-oxidizing in air. The ss-npNi is found to be a battery material in nature while exhibiting pseudocapacitive behavior. The redox reactions at the peaks are controlled by surface processes with fast charge-transfer, and the pseudocapacitive contribution of the redox current is dominant throughout the whole potential range. The pseudocapacitive behavior originates from the fast charge/discharge processes occurring on the ultathin metal oxide surface of the three-dimensional conductive ligaments. The ss-npNi exhibits high specific capacitance of 1424 F g(-1) at a current density of 1 A g(-1), enhanced rate capability with similar to 82.4% retention at a high current density of 40 A g(-1) and excellent cycle stability with similar to 95.7% retention even after 10000 continuous charge-discharge cycles at 40 A g(-1). This work renders the dealloying method a promising way of endowing battery materials with pseudocapacitive behavior.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据