Ammonium salt vanadium precipitation is the main method of vanadium metallurgy at home and abroad, but the traditional ammonium precipitation of vanadium can only obtain high valence of VO, and the NH produced in the calcination process cannot be fully utilized. And the preparation of low-valence vanadium oxide VO is long and costly. Self-reduction of thermal decomposition of nitrogen-containing precipitation products to produce VO is a novel and short process method that can achieve full utilization of ammonia. NaVO was used as the vanadium source, choline chloride (CHClNO (ChCl)) was used as the vanadium precipitation reagent, and the vanadium concentration was 30 g/L, n(ChCl)/n(V) = 1.5, the initial pH was 1.5, the temperature was 85°C, the time was 2 h, and the vanadium precipitation efficiency could reach 97.05%. VO with purity of 97.98% can be obtained by calcination at 550°C for 3 h in an argon atmosphere. XRD, FTIR, XPS, SEM-EDS were used to characterize the product, which further proved that the final product was VO. The electrocatalytic hydrogen evolution reaction (HER) of VO in acidic media showed high stability after 1000 cyclic voltammetry (CV) cycles, with a low Tafel slope of 88.5 mVdec. The electrochemical double layer capacitance (EDLC) was measured by CV at different scan rates, and the EDLC of VO was 1.104 mFcm. This study provides a short-flow preparation method for VO and can provide predictions for the application of VO in HER and supercapacitors.

中文翻译：

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铵盐还原短流程制备V2O3及其电催化性能研究

铵盐沉钒是目前国内外炼钒的主要方法，但传统的铵盐沉钒只能获得高价态的VO，并且在煅烧过程中产生的NH不能得到充分利用。而且低价氧化钒VO的制备周期长、成本高。含氮沉淀产物热分解自还原生产VO是一种新颖、流程短、可实现氨的充分利用的方法。以NaVO为钒源，氯化胆碱(CHClNO(ChCl))为沉钒试剂，钒浓度为30 g/L，n(ChCl)/n(V) = 1.5，初始pH为1.5，温度85℃，时间2h，析钒效率可达97.05%。在氩气气氛下550℃煅烧3h可得到纯度为97.98%的VO。采用XRD、FTIR、XPS、SEM-EDS对产物进行表征，进一步证明最终产物为VO。 VO 在酸性介质中的电催化析氢反应 (HER) 在 1000 次循环伏安法 (CV) 循环后表现出高稳定性，塔菲尔斜率较低，为 88.5 mVdec。通过CV在不同扫描速率下测量电化学双层电容（EDLC），VO的EDLC为1.104 mFcm。该研究提供了VO的短流程制备方法，可为VO在HER和超级电容器中的应用提供预测。