氮掺杂 CoP 电催化剂用于低能耗耦合析氢和硫生成。
Nitrogen-Doped CoP Electrocatalysts for Coupled Hydrogen Evolution and Sulfur Generation with Low Energy Consumption.
机构信息
National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences, Institute of Materials Engineering, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Jiangsu, 210093, China.
Department of Chemical Engineering, Northwest University, Shaanxi, 710069, China.
出版信息
Adv Mater. 2018 Jul;30(27):e1800140. doi: 10.1002/adma.201800140. Epub 2018 May 17.
Hydrogen production is the key step for the future hydrogen economy. As a promising H production route, electrolysis of water suffers from high overpotentials and high energy consumption. This study proposes an N-doped CoP as the novel and effective electrocatalyst for hydrogen evolution reaction (HER) and constructs a coupled system for simultaneous hydrogen and sulfur production. Nitrogen doping lowers the d-band of CoP and weakens the H adsorption on the surface of CoP because of the strong electronegativity of nitrogen as compared to phosphorus. The H adsorption that is close to thermos-neutral states enables the effective electrolysis of the HER. Only -42 mV is required to drive a current density of -10 mA cm for the HER. The oxygen evolution reaction in the anode is replaced by the oxidation reaction of Fe , which is regenerated by a coupled H S absorption reaction. The coupled system can significantly reduce the energy consumption of the HER and recover useful sulfur sources.
制氢是未来氢能经济的关键步骤。作为一种很有前途的制氢途径，水的电解受到高过电位和高能耗的限制。本研究提出了一种 N 掺杂 CoP 作为新型高效析氢反应（HER）电催化剂，并构建了一个同时生产氢气和硫磺的耦合系统。与磷相比，氮掺杂降低了 CoP 的 d 带，削弱了 H 在 CoP 表面的吸附，因为氮具有较强的电负性。接近热中性状态的 H 吸附有利于 HER 的有效电解。HER 需要的电流密度为-10 mA cm 时，仅需-42 mV 即可驱动。阳极中的氧气反应被 Fe 的氧化反应所取代，而 Fe 则通过耦合的 H 2 S 吸收反应得到再生。该耦合系统可以显著降低 HER 的能耗，并回收有用的硫磺资源。
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