电解水制氢气用催化剂制备及应用性能

Preparation and application performance of catalyst for hydrogen production from electrolytic water

针对传统贵金属催化剂和贵金属氧化剂价格昂贵、资源有限的问题,提出一种新型钨掺杂的磷化钴纳米针阵列催化剂(W-CoP/CC),并对该催化剂的析氢反应(HER)和析氧反应(OER)性能进行测试。实验结果表明,在前驱液中投入0.1mmol钨源制备的W-CoP/CC催化剂性能最佳。该催化剂HER电催化在0.5M稀H2SO4电解液和1.0M KOH电解液中过电位分别为31和77mV,塔菲尔斜率分别为57和65mV·dec^(-1)。OER在1.0M KOH电解液中塔菲尔斜率为74mV·dec^(-1)。用该催化剂进行电解水实验,在电流密度为10mA·cm^(-2)的条件下,催化剂电解电压约为1.59V,明显低于相关文献报道的钴基双功能催化剂所需的电解电压。在电流密度为20mA·cm^(-2)条件下连续工作20h后,电解池电压不发生变化,表现出良好的电解水性能和稳定性。

A new tungsten doped cobalt phosphide nanoneedle array catalyst(W-Co P/CC)was proposed to solve the problem of expensive and limited resources of traditional noble metal catalysts and noble metal oxidant catalysts,and its hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)performances were tested.The test results showed that the W-CoP/CC catalyst prepared by adding 0.1mmol tungsten source into the precursor fluid had the best performance.With this catalyst,the over-potential of HER electrocatalysis in 0.5M dilute sulfuric acid electrolyte and 1.0M potassium hydroxide electrolyte was 31 and 77mV,respectively,and the Tafel slope was 57 and 65mV·dec^(-1).Tafel slope was 74mV·dec^(-1)in 1.0M potassium hydroxide electrolyte of OER.The electrolysis voltage of the catalyst was about 1.59V under the condition of current density of 10mA·cm^(-2),which was significantly lower than the electrolysis voltage required by the cobalt-based bifunctional catalyst reported in relevant literature.After continuous operation for 20 hours under the condition of current density of 20mA·cm^(-2),the voltage of the electrolytic cell did not change,showing good performance and stability of electrolytic water.