Huang Jun, Xiong Yushuai, Peng Zhongyou, Chen Lingfang, Wang Li, Xu Yazhou, Tan Licheng, Yuan Kai, Chen Yiwang
Institute of Polymers and Energy Chemistry, College of Chemistry, Nanchang University, 999 Xuefu Avenue, Nanchang 330031, China.
Institute of Advanced Scientific Research (iASR), Jiangxi Normal University, 99 Ziyang Avenue, Nanchang 330022, China.
ACS Nano. 2020 Oct 27;14(10):14201-14211. doi: 10.1021/acsnano.0c07326. Epub 2020 Oct 4.
Transition-metal phosphates/phosphides possess promising theoretical electrochemical characteristics and exhibit great potential in advanced supercapacitors. Unfortunately, limited by the processing techniques and overall structure, their specific capacity and rate performance are still unsatisfactory. Herein, we report the fabrication of transition-metal phosphate electrodes with an ultrathin sheetlike array structure by one-step electrodeposition at room temperature. As a proof-of-concept, a transition-metal phosphate member of NiCo(HPO)·3HO with an ultrathin nanosheet structure (thickness ∼2.3 nm) was synthesized and investigated. The as-prepared NiCo(HPO)·3HO electrode showcases an ultrahigh specific capacity of 1768.5 C g at 2 A g (the highest value for transition-metal phosphates/phosphides reported to date), superb rate performance of 1144.8 C g at 100 A g, and excellent electrochemical stability. Moreover, the transition-metal phosphate nanosheet array can be uniformly deposited on various conductive substrates, demonstrating the generality of our strategy. Therefore, this simple electrodeposition strategy provides an opportunity to fabricate ultrathin transition-metal phosphate nanosheet materials that can be used for energy storage/conversion, electrocatalysis, and other electrochemical energy-related devices.
过渡金属磷酸盐/磷化物具有良好的理论电化学特性，在先进超级电容器中展现出巨大潜力。不幸的是，受加工技术和整体结构的限制，它们的比容量和倍率性能仍不尽人意。在此，我们报道了通过室温下一步电沉积制备具有超薄片状阵列结构的过渡金属磷酸盐电极。作为概念验证，合成并研究了具有超薄纳米片结构（厚度约2.3 nm）的NiCo(HPO₄)·3H₂O过渡金属磷酸盐成员。所制备的NiCo(HPO₄)·3H₂O电极在2 A g⁻¹时展现出1768.5 C g⁻¹的超高比容量（为迄今报道的过渡金属磷酸盐/磷化物的最高值），在100 A g⁻¹时具有1144.8 C g⁻¹的卓越倍率性能以及优异的电化学稳定性。此外，过渡金属磷酸盐纳米片阵列能够均匀地沉积在各种导电基底上，证明了我们策略的通用性。因此，这种简单的电沉积策略为制备可用于能量存储/转换、电催化及其他电化学能源相关器件的超薄过渡金属磷酸盐纳米片材料提供了契机。
