Xiaomei Wang, Tiantian Wang, Yongren Yu, Junhua You, Fang Hu and Depeng Zhao
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引用次数: 0
摘要
开发低成本、高效和稳定的双功能电催化剂对于可再生能源的开发非常重要。层状双氢氧化物(LDHs)具有灵活的离子交换、丰富的结构可调性、优异的热稳定性以及易于与其他材料功能化等特点,被认为是一种前景广阔的电催化剂。本研究采用简单的水热法制备了镍钴层状双氢氧化物(NiCo-LDH)纳米片阵列。通过调整镍/钴比例(5 - x : x),得到了 Ni1Co4-LDH、Ni2Co3-LDH、Ni3Co2-LDH 和 Ni4Co1-LDH 四种样品。其中,Ni2Co3-LDH 样品表现出优异的 HER 和 OER 性能。在 1.0 M KOH 电解液中,电流密度为 50 mA cm-2 时,HER 和 OER 的过电位分别为 227 mV 和 303 mV。此外,作为一种用于水分离的双功能电催化剂,该样品在 50 mA cm-2 电流密度下可提供 1.83 V 的电压和长期稳定性。
Enhancing the efficiency and stability of electrocatalysts for water splitting: NiCo-LDH nanosheet arrays at high current density
The development of low-cost, efficient, and stable bifunctional electrocatalysts is very important for the development of renewable energy. Layered double hydroxides (LDHs) are considered to be promising electrocatalysts due to their flexible ion exchange, abundant structural adjustability, excellent thermal stability, and easy functionalization with other materials. In this work, nickel-cobalt layered double hydroxide (NiCo-LDH) nanosheet arrays are prepared by a simple hydrothermal method. Four samples Ni1Co4-LDH, Ni2Co3-LDH, Ni3Co2-LDH and Ni4Co1-LDH are obtained by adjusting the Ni/Co ratio (5 − x : x). Among them, the Ni2Co3-LDH samples show excellent HER and OER properties. At a current density of 50 mA cm−2 in a 1.0 M KOH electrolyte, the overpotentials of the HER and OER are 227 mV and 303 mV, respectively. In addition, as a bifunctional electrocatalyst for water splitting, the sample provides a voltage of 1.83 V and long-term stability at 50 mA cm−2.