2D CoOOH Sheet-Encapsulated Ni(2)P into Tubular Arrays Realizing 1000 mA cm(-2)-Level-Current-Density Hydrogen Evolution Over 100 h in Neutral Water.
2D CoOOH Sheet-Encapsulated Ni(2)P into Tubular Arrays Realizing 1000 mA cm(-2)-Level-Current-Density Hydrogen Evolution Over 100 h in Neutral Water.
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2D CoOOH 片材封装 Ni2P 到管状阵列中，在中性水中实现 1000 mA cm(-2) 级电流密度析氢超过 100 小时
DOI：
10.1007/s40820-020-00476-4
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发表时间：
2020-07-02
影响因子：
26.6
通讯作者：
Zhai T
中科院分区：
文献类型：
--
作者：
Zhang S;Wang W;Hu F;Mi Y;Wang S;Liu Y;Ai X;Fang J;Li H;Zhai T
从概念上提出了2DCoOOH片状包裹Ni2P形成管状阵列的电催化体系，该体系具有更快的传质、结构稳定性和电子调谐能力。所设计的电催化剂在中性水中实现了预期的1000mA/cm−2能级电流密度析氢超过100h。本文的在线版本(10.1007/s40820-020-020-4)包含补充材料，可供授权用户使用。高电流密度(1000mA/cm−~2级)下的电解水具有优异的耐久性，特别是在中性电解液中，是绿色氢气从实验走向工业化的关键问题。除了由电子结构决定的高本征活性外，电催化剂还要求具有快速传质(电解液充电和气泡溢出)和高机械稳定性。在此基础上，提出了2DCoOOH片包裹Ni2P管状阵列的电催化体系，并实现了在中性水中100h的1000mA/cm−2能级电流密度析氢。在所设计的催化剂中，2D堆叠结构作为一种自适应材料，可以通过释放应力来缓冲电解液对流、氢泡破裂和演化的冲击，从而确保了长周期的稳定性。同时，堆叠单元之间丰富的孔隙率有助于电解液的良好渗透和氢泡的滑移，保证了电解液在大电流催化下的快速充电和气泡的析出。此外，界面电荷转移引起的电子结构调制也有利于提高本征活性。深刻地说，多尺度协调调控将为设计高效工业电催化剂提供指导。本文的在线版本(10.1007/s4082020-00476-4)包含向授权用户提供的补充材料。
The 2D CoOOH sheet-encapsulated Ni2P into tubular arrays electrocatalytic system with expediting mass transport, structural stability, and tuned electron was conceptually proposed. The designed electrocatalysts realize expectant 1000 mA cm−2-level-current-density hydrogen evolution in neutral water for over 100 h. The online version of this article (10.1007/s40820-020-00476-4) contains supplementary material, which is available to authorized users. Water electrolysis at high current density (1000 mA cm−2 level) with excellent durability especially in neutral electrolyte is the pivotal issue for green hydrogen from experiment to industrialization. In addition to the high intrinsic activity determined by the electronic structure, electrocatalysts are also required to be capable of fast mass transfer (electrolyte recharge and bubble overflow) and high mechanical stability. Herein, the 2D CoOOH sheet-encapsulated Ni2P into tubular arrays electrocatalytic system was proposed and realized 1000 mA cm−2-level-current-density hydrogen evolution over 100 h in neutral water. In designed catalysts, 2D stack structure as an adaptive material can buffer the shock of electrolyte convection, hydrogen bubble rupture, and evolution through the release of stress, which insure the long cycle stability. Meanwhile, the rich porosity between stacked units contributed the good infiltration of electrolyte and slippage of hydrogen bubbles, guaranteeing electrolyte fast recharge and bubble evolution at the high-current catalysis. Beyond that, the electron structure modulation induced by interfacial charge transfer is also beneficial to enhance the intrinsic activity. Profoundly, the multiscale coordinated regulation will provide a guide to design high-efficiency industrial electrocatalysts. The online version of this article (10.1007/s40820-020-00476-4) contains supplementary material, which is available to authorized users.
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