A self-supported and flexible current collector solely made of earth-abundant elements, NiCo layered double hydroxide (LDH) wrapped around Cu nanowires (Cu-Ws) grown on top of commercially available Cu mesh (Cu-m), outperforms the benchmark 40 wt% Pt/C in catalyzing the electrochemical hydrogen evolution reaction (HER). The Cu-m/Cu-W/NiCo-LDH cathode operates both in acidic and alkaline media exhibiting high turnover frequencies (TOF) at 30 mV (0.3 H₂ s⁻¹ in 1 M KOH and 0.32 H₂ s⁻¹ in 0.5 M H₂SO₄, respectively) and minimal overpotentials of 15 ± 6 mV in 1 M KOH and 27 ± 2 mV in 0.5 M H₂SO₄ at −10 mA cm⁻². Cu-m/Cu-W/NiCo-LDH outperforms the activity of 40 wt% Pt/C that needs overpotentials of 22 and 18 mV in 1 M KOH and 0.5 M H₂SO₄, respectively. With a tremendous advantage over Pt/C in triggering proton reduction with fast kinetics, similar mass activity and pH-universality, the current collector demonstrates outstanding operational durability even at above −1 A cm⁻². The high density of electronic states near the Fermi energy level of Cu-Ws is found to be a pivotal factor for efficient electron transfer to the NiCo-LDH catalyst. This class of self-supported electrodes is expected to trigger rapid progress in developing high performance energy conversion and storage devices.

中文翻译：

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富含地球的双金属催化剂涂覆的金属纳米线生长电极，在高电流密度下具有类似铂的pH值普遍析氢活性

NiCo层状双氢氧化物（LDH）完全由富含稀土元素制成的自支撑且灵活的集电器，包裹在生长在市售Cu网格（Cu-m）上的Cu纳米线（Cu-Ws）上，性能优于基准40重量百分比的Pt / C催化电化学放氢反应（HER）。在Cu-米/铜-W /镍钴-LDH阴极在酸性和碱性介质中进行操作都在30毫伏（0.3ħ表现出高的转换频率（TOF）_2个小号^-1在1M KOH和0.32ħ _2个小号^-1在0.5分别为MH ₂ SO ₄）和在-10 mA cm ^-2下在1 M KOH中为15±6 mV和在0.5 MH ₂ SO _4中为27±2 mV的最小过电势。Cu-m / Cu-W / NiCo-LDH的性能优于40 wt％Pt / C的活性，在1 M KOH和0.5 MH ₂ SO ₄中分别需要22和18 mV的超电势。与Pt / C相比，它在触发质子还原方面具有巨大的优势，具有快速动力学，相似的质量活度和pH值通用性，即使在-1 A cm ^-2以上，集流体也表现出出色的工作耐久性。发现在Cu-Ws的费米能级附近的高电子态密度是有效电子转移到NiCo-LDH催化剂的关键因素。这类自支撑电极有望触发开发高性能能量转换和存储设备的快速进展。