Yang Wenshu, Wang Shuaishuai, Zhao Kun, Hua Yutao, Qiao Jiangxiao, Luo Wei, Li Longhua, Hao Jinhui, Shi Weidong
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, China.
Jingjiang College, Jiangsu University, Zhenjiang, China.
J Colloid Interface Sci. 2021 Nov 15;602:115-122. doi: 10.1016/j.jcis.2021.06.013. Epub 2021 Jun 10.
The lack of high active and stable electrocatalysts has impeded the development of electrochemical water splitting device, which is promising technique for renewable energy conversion system. Here, we report a one-step protocol to synthesize P doped NiSe (P-NiSe) by selenylation process derived from nickel foam with assistant of NaHPO and Se powder. The P-NiSe could be directly used as working electrode and shows the superior electrochemical activity, offering current density of 10 mA cm with overpotential of 270 mV for OER and 71 mV for HER. The enhanced electrochemical activity can be ascribed to the P atom doping. The P atom doping leads to the high valence state of Ni active sites, which have high catalytic ability towards OER. Moreover, the P doping makes the d-band center of Ni atoms in P-NiSe move close to Fermi level, facilitating the HER kinetics with respect to proton adsorption and hydrogen desorption. When employed P-NiSe as both anodic and cathodic electrode in alkaline water electrolyzer, a current density of 10 mA cm can be achieved at 1.58 V. Our work highlights the importance of P doping in determining the surface electron configuration for full device water splitting and the facile synthesis protocol would be promising for realistic applications.
缺乏高活性和稳定的电催化剂阻碍了电化学水分解装置的发展，而电化学水分解装置是可再生能源转换系统中一项很有前景的技术。在此，我们报道了一种一步法协议，即在NaHPO和Se粉末的辅助下，通过泡沫镍衍生的硒化过程合成P掺杂的NiSe（P-NiSe）。P-NiSe可直接用作工作电极，并表现出优异的电化学活性，在OER时提供10 mA cm的电流密度，过电位为270 mV，在HER时过电位为71 mV。增强的电化学活性可归因于P原子掺杂。P原子掺杂导致Ni活性位点处于高价态，对OER具有高催化能力。此外，P掺杂使P-NiSe中Ni原子的d带中心靠近费米能级，有利于质子吸附和氢脱附的HER动力学。当在碱性水电解槽中使用P-NiSe作为阳极和阴极电极时，在1.58 V下可实现10 mA cm的电流密度。我们的工作突出了P掺杂在确定全装置水分解表面电子构型方面的重要性，并且这种简便的合成协议在实际应用中将很有前景。
